Nanohybrid Materials For Water Purification

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Nanohybrid Materials for Water Purification

Author : Sarat K. Swain
Publisher : Springer Nature
ISBN 13 : 9811923329
Total Pages : 341 pages
Book Rating : 4.8/5 (119 download)

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Book Synopsis Nanohybrid Materials for Water Purification by : Sarat K. Swain

Download or read book Nanohybrid Materials for Water Purification written by Sarat K. Swain and published by Springer Nature. This book was released on 2022-08-12 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews the key topics in the area of nanocomposites and hybrid materials used for waste water treatment and purification. It covers materials chemistry, various synthesis approaches and properties of these nanomaterials for the different water purification techniques. It provides new direction to the readers to better understand the chemistry behind these materials and the methods to improve their properties. This book will be a very valuable reference source for graduates and postgraduates, engineers, research scholars (primarily in the field of material science, water, nanoscience and nanotechnology), material scientists, researchers in the water-related area, scientists working in water treatment plans and pollution mitigation industries.

Nanohybrid Materials for Water Purification

Author : Sarat K. Swain
Publisher :
ISBN 13 : 9789811923333
Total Pages : 0 pages
Book Rating : 4.9/5 (233 download)

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Book Synopsis Nanohybrid Materials for Water Purification by : Sarat K. Swain

Download or read book Nanohybrid Materials for Water Purification written by Sarat K. Swain and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews the key topics in the area of nanocomposites and hybrid materials used for waste water treatment and purification. It covers materials chemistry, various synthesis approaches and properties of these nanomaterials for the different water purification techniques. It provides new direction to the readers to better understand the chemistry behind these materials and the methods to improve their properties. This book will be a very valuable reference source for graduates and postgraduates, engineers, research scholars (primarily in the field of material science, water, nanoscience and nanotechnology), material scientists, researchers in the water-related area, scientists working in water treatment plans and pollution mitigation industries.

Membranes for Water Treatment

Author : Klaus-Viktor Peinemann
Publisher : John Wiley & Sons
ISBN 13 : 9783527631414
Total Pages : 251 pages
Book Rating : 4.6/5 (314 download)

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Book Synopsis Membranes for Water Treatment by : Klaus-Viktor Peinemann

Download or read book Membranes for Water Treatment written by Klaus-Viktor Peinemann and published by John Wiley & Sons. This book was released on 2010-11-29 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ready reference on Membrane Technologies for Water Treatment, is an invaluable source detailing sustainable, emerging processes, to provide clean, energy saving and cost effective alternatives to conventional processes. The editors are internationally renowned leaders in the field, who have put together a first-class team of authors from academia and industry to present a highly approach to the subject. The book is an instrumental tool for Process Engineers, Chemical Engineers, Process Control Technicians, Water Chemists, Environmental Chemists, Materials Scientists and Patent Lawyers.

Eco-Friendly Nano-Hybrid Materials for Advanced Engineering Applications

Author : S. Ananda Kumar
Publisher : CRC Press
ISBN 13 : 1771882956
Total Pages : 436 pages
Book Rating : 4.7/5 (718 download)

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Book Synopsis Eco-Friendly Nano-Hybrid Materials for Advanced Engineering Applications by : S. Ananda Kumar

Download or read book Eco-Friendly Nano-Hybrid Materials for Advanced Engineering Applications written by S. Ananda Kumar and published by CRC Press. This book was released on 2017-03-27 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book focuses on eco-friendly nanohybrid. It clearly summarizes the fundamentals and established techniques of synthesis and processing of eco-friendly nanohybrid materials to provide a systematic and coherent picture of synthesis and the processing of nanomaterials. The research on nanotechnology is evolving and expanding very rapidly. Nanotechnology represents an emerging technology that has the potential to have an impact on an incredibly wide number of industries, such as the medical, environmental, and pharmaceutical industries. There is a growing need to develop environmentally friendly processes for corrosion control that do not employ toxic chemicals. This book helps to fill this need. This volume is a comprehensive compilation of several trending research topics, such as fouling, energy-storing devices, water treatment, corrosion, biomaterials, and high performance materials. The topics are approached in an encompassing manner, covering the basics and the recent trends in this area, clearly defining the problems and suggesting potential solutions. Topics in the book include: Synthesis of complex polymer intermediates Synthesis of nanoparticles and nanofibers Binding interaction between nano- and micromaterials Fabrication of polymer nanocomposites Making of functionally terminated nanohybrid coatings Development of corrosion resistant coatings Antifouling coatings Bioceramic materials Materials for therapeutic and aesthetic applications Eco-Friendly Nano-Hybrid Materials for Advanced Engineering Applications will benefit a wide variety of those in this field, including: Shipping and coating industries encountering fouling problems Innovators in the field of energy storage and electrical equipment Developers of efficient water treatment systems Biomedical industries looking for novel bio-compatible materials Industries seeking high performance epoxy-based materials needed for specific applications

Multifunctional Hybrid Nanomaterials for Sustainable Agri-food and Ecosystems

Author : Kamel A Abd-Elsalam
Publisher : Elsevier
ISBN 13 : 012821354X
Total Pages : 730 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Multifunctional Hybrid Nanomaterials for Sustainable Agri-food and Ecosystems by : Kamel A Abd-Elsalam

Download or read book Multifunctional Hybrid Nanomaterials for Sustainable Agri-food and Ecosystems written by Kamel A Abd-Elsalam and published by Elsevier. This book was released on 2020-03-31 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multifunctional Hybrid Nanomaterials for Sustainable Agrifood and Ecosystems shows how hybrid nanomaterials (HNMs) are being used to enhance agriculture, food and environmental science. The book discusses the synthesis and characterization of HNMs before exploring agrifoods and environmental functions. It shows how novel HNMs are being used for the detection and separation of heavy metal ions, for destroying and sensing of insecticides, in managed release fertilizer and pesticide formulations, plant protection, plant promotions, purification, detection, and to control mycotoxins. Further, the book describes the use of silica-based total nanosystems, carbon nanotubes, nanocellulose-based, and polymer nanohybrids for agricultural and biological applications. This book is an important reference source for materials scientists, engineers and food scientists who want to gain a greater understanding on how multifunctional nanomaterials are being used for a range of agricultural and environmental applications.

Environmental Nanotechnology for Water Purification

Author : Shahid Ul-Islam
Publisher : John Wiley & Sons
ISBN 13 : 1119640458
Total Pages : 336 pages
Book Rating : 4.1/5 (196 download)

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Book Synopsis Environmental Nanotechnology for Water Purification by : Shahid Ul-Islam

Download or read book Environmental Nanotechnology for Water Purification written by Shahid Ul-Islam and published by John Wiley & Sons. This book was released on 2020-07-15 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dyes, pigments and metals are extensively used in food, paper, carpet, rubber, plastics, cosmetics, and textile industries, in order to color and finish products. As a result, they generate a considerable amount of coloured wastewater rich in organic, inorganic, and mineral substances which are continuously polluting the water bodies and affecting human and aquatic life. Besides these industries, urban and agricultural activities also generate effluents high in biochemical oxygen demand (BOD) and chemical oxygen demand (COD). In recent years, considerable research work has been done in this area and is underway to eliminate heavy metals particularly mercury (Hg), chromium (Cr), lead (Pb), selenium and cadmium (Cd) and synthetic dyes from polluted waters which have high toxicity and carcinogenicity. Currently a number of methods are in operation to decontaminate the polluted waters. Among several purification technologies, use of nanoparticles/composites have gained much attention as efficient purification technology due to its many advantages such as simple synthesis, special chemical and physical properties, unique photocatalytic activity and beneficial antimicrobial properties and high efficiency. The book Environmental Nanotechnology for Water Purification comprehensively covers and provides new insights on all nanoparticles, composites and advanced methods employed in water purification.

Nanohybrids in Environmental & Biomedical Applications

Author : Surender Kumar Sharma
Publisher : CRC Press
ISBN 13 : 1351256831
Total Pages : 396 pages
Book Rating : 4.3/5 (512 download)

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Book Synopsis Nanohybrids in Environmental & Biomedical Applications by : Surender Kumar Sharma

Download or read book Nanohybrids in Environmental & Biomedical Applications written by Surender Kumar Sharma and published by CRC Press. This book was released on 2019-07-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructured nanoparticles have the capability for a broad range of novel and enhanced properties, which leads to appealing biomedical and environmental applications. This timely new book addresses the design and preparation of multiphase nanomaterials with desired size, shape, phase composition, and crystallinity, as well as their current applications. It emphasizes key examples to motivate deeper studies, including nanomaterial-based hyperthermia treatment of cancer, nanohybrids for water purification, nanostructures used in the removal or detection of bioagents from waste water, and so on. Features Presents state of the art research on heterostructured nanomaterials, from their synthesis and physiochemical properties to current environmental and biological applications. Includes details on toxicity and risk assessment of multifunctional nanomaterials. Discusses recent developments and utilization in healthcare by leading experts. Introduces the main features of functionalization of nanomaterials in terms of desired size, shape, phase composition, surface functionalization/coating, toxicity, and geometry. Emphasizes practical applications in the environmental and biomedical sectors.

Nanoscale Materials in Water Purification

Author : Sabu Thomas
Publisher : Elsevier
ISBN 13 : 0128139277
Total Pages : 892 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Nanoscale Materials in Water Purification by : Sabu Thomas

Download or read book Nanoscale Materials in Water Purification written by Sabu Thomas and published by Elsevier. This book was released on 2018-11-14 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel nanoscale materials are now an essential part of meeting the current and future needs for clean water, and are at the heart of the development of novel technologies to desalinate water. The unique properties of nanomaterials and their convergence with current treatment technologies present great opportunities to revolutionize water and wastewater treatment. Nanoscale Materials for Water Purification brings together sustainable solutions using novel nanomaterials to alleviate the physical effects of water scarcity. This book covers a wide range of nanomaterials, including noble metal nanoparticles, magnetic nanoparticles, dendrimers, bioactive nanoparticles, polysaccharidebased nanoparticles, nanocatalysts, and redox nanoparticles for water purification. Significant properties and characterization methods of nanomaterials such as surface morphology, mechanical properties, and adsorption capacities are also investigated - Explains how the unique properties of a range of nanomaterials makes them important water purification agents - Shows how the use of nanotechnology can help create cheaper, more reliable, less energy-intensive, more environmentally friendly water purification techniques - Includes case studies to show how nanotechnology has successfully been integrated into water purification system design

Nanohybrid Materials for Treatment of Textiles Dyes

Author : Akil Ahmad
Publisher : Springer Nature
ISBN 13 : 9819939011
Total Pages : 489 pages
Book Rating : 4.8/5 (199 download)

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Book Synopsis Nanohybrid Materials for Treatment of Textiles Dyes by : Akil Ahmad

Download or read book Nanohybrid Materials for Treatment of Textiles Dyes written by Akil Ahmad and published by Springer Nature. This book was released on 2023-10-23 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the various aspects of nanohybrid materials and its composites for their application in treatment of toxic textiles dyes for cleaning the environment especially water and wastewater. The book first looks into the various preparation and characterization techniques for nanohybrid materials. The replacement of other conventional materials with highly efficient (high surface area, pore size, and chemical and mechanical strength) nanohybrid materials and their application in the field of environmental purification through treatment of textile dyes is highlighted in the later part of the book. The book caters to students, researchers, and scientists who are working in the field of wastewater treatment for incorporating novel materials to remove toxic textile dyes from contaminated wastewater.

Nanocarbon and Its Composites

Author : Anish Khan
Publisher : Woodhead Publishing
ISBN 13 : 0081025106
Total Pages : 874 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Nanocarbon and Its Composites by : Anish Khan

Download or read book Nanocarbon and Its Composites written by Anish Khan and published by Woodhead Publishing. This book was released on 2018-11-30 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocarbon and Its Composites: Preparation, Properties and Applications provides a detailed and comprehensive review of all major innovations in the field of nanocarbons and their composites, including preparation, properties and applications. Coverage is broad and quite extensive, encouraging future research in carbon-based materials, which are in high demand due to the need to develop more sustainable, recyclable and eco-friendly methods for materials. Chapters are written by eminent scholars and leading experts from around the globe who discuss the properties and applications of carbon-based materials, such as nanotubes (buckytubes), fullerenes, cones, horns, rods, foams, nanodiamonds and carbon black, and much more. Chapters provide cutting-edge, up-to-date research findings on the use of carbon-based materials in different application fields and illustrate how to achieve significant enhancements in physical, chemical, mechanical and thermal properties. - Demonstrates systematic approaches and investigations from design, synthesis, characterization and applications of nanocarbon based composites - Aims to compile information on the various aspects of synthesis, properties and applications of nano-carbon based materials - Presents a useful reference and technical guide for university academics and postgraduate students (Masters and Ph.D.)

Nanomaterials for Water Treatment and Remediation

Author : Srabanti Ghosh
Publisher : CRC Press
ISBN 13 : 1000485323
Total Pages : 488 pages
Book Rating : 4.0/5 (4 download)

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Book Synopsis Nanomaterials for Water Treatment and Remediation by : Srabanti Ghosh

Download or read book Nanomaterials for Water Treatment and Remediation written by Srabanti Ghosh and published by CRC Press. This book was released on 2021-12-28 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering a comprehensive view of water-treatment technologies, Nanomaterials for Water Treatment and Remediation explores recent developments in the use of advanced nanomaterials (ANMs) for water treatment and remediation. In-depth reaction mechanisms in water-treatment technologies, including adsorption, catalysis, and membrane filtration for water purification using ANMs, are discussed in detail. The book includes an investigation of the fabrication processes of nanostructured materials and the fundamental aspects of surfaces at the nanoscale. The book also covers the removal of water-borne pathogens and microbes through a photochemical approach. FEATURES Explains various chemical treatments for the removal and separation of hazardous dyes, organic pollutants, pharmaceuticals, and heavy metals from aqueous solutions, including adsorption, advanced oxidation process, and photocatalysis Discusses the rational design of nanoporous materials with a tunable pore structure and fabrication of nanomaterials by surface chemistry engineering Covers the role of nanomaterials-assisted oxidation and reduction processes, design of nano-assisted membrane-based separation, and multifunctional nanomaterials and nanodevices for water treatment Provides an understanding of the structure–activity relationship and stability of ANMs under critical experimental conditions Identifies potential challenges in the application of multifunctional ANMs for future research Nanomaterials for Water Treatment and Remediation is aimed at researchers and industry professionals in chemical, materials, and environmental engineering as well as related fields interested in the application of advanced materials to water treatment and remediation.

Nanohybrid and Nanoporous Materials for Aquatic Pollution Control

Author : Lin Tang
Publisher : Elsevier
ISBN 13 : 0128141557
Total Pages : 324 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Nanohybrid and Nanoporous Materials for Aquatic Pollution Control by : Lin Tang

Download or read book Nanohybrid and Nanoporous Materials for Aquatic Pollution Control written by Lin Tang and published by Elsevier. This book was released on 2018-10-12 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanohybrid and Nanoporous Materials for Aqueous Environmental Pollution Control gives a comprehensive treatment of fabrication methods and their application in environmental remediation, including adsorption, catalysis and signal transfer in pollutant detection. The design, fabrication and application of nanohybrid and nanoporous materials for environmental pollution control are described in detail, along with discussions on their synthesis, characterization, and applications in different aspects of pollutant treatment. Chapters introduce the design and synthesis of magnetic nanohybrid materials, advanced oxide process-photocatalytic degradation of environmental pollutants based on nanomaterials, and nanohybrids of iron based materials for reduction and oxidation of aqueous recalcitrant pollutant. Finally, challenges and suggestions in the application of nanomaterials for environmental pollution control are discussed, as is an analysis of the future perspective of nanomaterials for environmental application. - Presents the most up-to-date developments in this rapidly progressing field - Provides suggestions to address challenges and solve current problems related to the application of nanoporous materials - Discusses future trends and perspectives in the area of nanohybrid and nanoporous materials

Nanomaterials for Environmental Protection

Author : Boris I. Kharisov
Publisher : John Wiley & Sons
ISBN 13 : 1118845544
Total Pages : 1449 pages
Book Rating : 4.1/5 (188 download)

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Book Synopsis Nanomaterials for Environmental Protection by : Boris I. Kharisov

Download or read book Nanomaterials for Environmental Protection written by Boris I. Kharisov and published by John Wiley & Sons. This book was released on 2014-08-27 with total page 1449 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is divided into four main sections thoroughly analyzing the use of nanomaterials for water, air and soil solutions, and emphasizing environmental risks. Providing background on nanomaterials' two-decade study, it discusses the characterization and application of unconventional disinfectants, called antimicrobial nanomaterials, which fall into three categories and, while seemingly harmless, have potential hazards if applied improperly. Special attention is given to the process of remediation, synthetics techniques, and properties of nanomaterials, with examples to which new and trained readers in the field can relate and understand. an interdisciplinary approach, aimed at scientists in physical chemistry, nanotechnology, and environmental sciences includes applications of non-conventional techniques in environmental protection furthers the development of applied nanoscience and nanotechnology suggests new industrial projects and university courses addressing nanotechnology in and for the environment includes applications for water, air and soil protection

Nanotechnology for Oil-Water Separation

Author : Nisar Ali
Publisher : Elsevier
ISBN 13 : 0323955185
Total Pages : 606 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Nanotechnology for Oil-Water Separation by : Nisar Ali

Download or read book Nanotechnology for Oil-Water Separation written by Nisar Ali and published by Elsevier. This book was released on 2023-09-21 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology for Oil-Water Separation: From Fundamentals to Industrial Applications explores how nanotechnologically engineered solutions (modified meshes, carbon nanotubes, functionalized fabrics, textile or hybrid elements for bio-membranes, nanofibrous materials, and many more) can be used to remediate current damage to the environment for a better tomorrow. Design and fabrication of low-cost, effective and environmentally friendly micro/nanomaterials exhibiting strong wettability properties and mechanical and chemical stability are examined, along with current research developments and possible future directions, making this book an essential read for researchers, advanced students, and industry professionals with an interest in nanotechnology and sustainable (bio)technologies. The increasing amounts of industrial substances released by petrochemical, steel or gas-generating plants and food-processing factories into water poses an ever more serious environmental threat. Due to the significant adverse impact on the natural ecosystem, aquatic organisms and human health, the scientific community has made its priority to find sustainable methods to separate oil-water mixtures. - Provides an "all-in-one" reference on oil-water separation using cutting-edge, cost-effective, and environmentally-friendly nanotechnology-based solutions - Sheds light on the proper disposal, management and treatment processes of petroleum wastewater - Includes a discussion on new developments and findings, as well as challenges and concerns with an indication of where the field may move in coming years

Tourism in Asian Cities

Author : Saurabh Kumar Dixit
Publisher : Routledge
ISBN 13 : 0429555350
Total Pages : 304 pages
Book Rating : 4.4/5 (295 download)

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Book Synopsis Tourism in Asian Cities by : Saurabh Kumar Dixit

Download or read book Tourism in Asian Cities written by Saurabh Kumar Dixit and published by Routledge. This book was released on 2020-12-17 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely and significant book explores the characteristics and complexities of Asian urban tourism, considering the extent to which Western paradigms can be transferred to Asian settings and the striking contrasts that exist within the region. In an era of unprecedented urban expansion in Asian cities, this book comes at a time of great urgency, illuminating the possible problems and opportunities that arise when a destination emerges as a tourism hotspot. Split into three parts; introducing Asian urban tourism and urbanization, the management and marketing of Asian cities, and emerging trends and issues associated with Asian urban tourism, the book offers a range of varying and vibrant perspectives from international and interdisciplinary experts in the field. Chapters include studies on a wide range of destinations such as Hong Kong, Macau, Cambodia, Phuket, Kolkata, Busan, Delhi, and Sri Lanka among many others, and explore crucial contemporary themes such as overtourism, urbanization and administrative challenges, world heritage, smart cities and the use of technologies such as VR in urban tourism experience creation. It will be a vital resource for upper-level students, researchers, and academics in tourism, city tourism, Asian studies, development studies, cultural studies, and sustainability, as well as professionals in the field of tourism management.

Advanced Nanostructured Materials for Environmental Remediation

Author : Mu. Naushad
Publisher : Springer
ISBN 13 : 3030044777
Total Pages : 399 pages
Book Rating : 4.0/5 (3 download)

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Book Synopsis Advanced Nanostructured Materials for Environmental Remediation by : Mu. Naushad

Download or read book Advanced Nanostructured Materials for Environmental Remediation written by Mu. Naushad and published by Springer. This book was released on 2019-03-14 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a wide-range exploration on the ongoing research and developmental events in environmental nanotechnology. Emerging nanomaterials and its technology have been known to offer unique advantages and are continually showing promising potential attracting continuous global attention. This work thus discusses experimental studies of various nanomaterials along with their design and applications and with specific attention to chemical reactions and their challenges for catalytic systems. It will make a noteworthy appeal to scientists and researchers working in the field of nanotechnology for environmental sciences.

Iron Nanomaterials for Water and Soil Treatment

Author : Marta I. Litter
Publisher : CRC Press
ISBN 13 : 1351334786
Total Pages : 393 pages
Book Rating : 4.3/5 (513 download)

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Book Synopsis Iron Nanomaterials for Water and Soil Treatment by : Marta I. Litter

Download or read book Iron Nanomaterials for Water and Soil Treatment written by Marta I. Litter and published by CRC Press. This book was released on 2018-09-03 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology has a great potential for providing efficient, cost-effective, and environmentally acceptable solutions to face the increasing requirements on quality and quantity of fresh water for industrial, agricultural, or human use. Iron nanomaterials, either zerovalent iron (nZVI) or iron oxides (nFeOx), present key physicochemical properties that make them particularly attractive as contaminant removal agents for water and soil cleaning. The large surface area of these nanoparticles imparts high sorption capacity to them, along with the ability to be functionalized for the enhancement of their affinity and selectivity. However, one of the most important properties is the outstanding capacity to act as redox-active materials, transforming the pollutants to less noxious chemical species by either oxidation or reduction, such as reduction of Cr(VI) to Cr(III) and dehalogenation of hydrocarbons. This book focuses on the methods of preparation of iron nanomaterials that can carry out contaminant removal processes and the use of these nanoparticles for cleaning waters and soils. It carefully explains the different aspects of the synthesis and characterization of iron nanoparticles and methods to evaluate their ability to remove contaminants, along with practical deployment. It overviews the advantages and disadvantages of using iron-based nanomaterials and presents a vision for the future of this nanotechnology. While this is an easy-to-understand book for beginners, it provides the latest updates to experts of this field. It also opens a multidisciplinary scope for engineers, scientists, and undergraduate and postgraduate students. Although there are a number of books published on the subject of nanomaterials, not too many of them are especially devoted to iron materials, which are rather of low cost, are nontoxic, and can be prepared easily and envisaged to be used in a large variety of applications. The literature has scarce reviews on preparation of iron nanoparticles from natural sources and lacks emphasis on the different processes, such as adsorption, redox pathways, and ionic exchange, taking place in the removal of different pollutants. Reports and mechanisms on soil treatment are not commonly found in the literature. This book opens a multidisciplinary scope for engineers and scientists and also for undergraduate or postgraduate students.