Adsorption of heavy metal ions in water by surface functionalized magnetic composites: a review

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Abstract

This review systematically summarizes the application of magnetic composite adsorbents for the removal of heavy metal ions in water and focuses on the surface functionalization of magnetic materials.

Abstract

Water pollution caused by toxic heavy metal ions and their by-products can effectively be removed by the adsorption method, but traditional adsorbents generally have problems, such as inconvenient adsorbent recovery, low adsorption capacity, poor selective adsorption, and secondary treatment. Therefore, the development of adsorbents with easy recovery, high adsorption capacity, strong selectivity, which are safe and economical has always been a research hotspot. Nano-magnetic hybrid materials are an important new type of aqueous heavy metal ion adsorbents because their unique nano and magnetic properties and abundant active functional groups enable them to integrate the above-mentioned excellent properties. This review systematically summarizes the application of magnetic composite adsorbents for the removal of heavy metal ions in water and focuses on the surface functionalization of magnetic materials. The goal of this review is to provide the latest research progress, current problems, and future prospects in the removal of heavy metal ions from water by organic small molecule materials, polymeric materials and inorganic materials modified magnetic adsorption materials.

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Removal of heavy metal ions from wastewaters: a review.

Fenglian Fu, Qi Wang (2011)

Heavy metal pollution has become one of the most serious environmental problems today. The treatment of heavy metals is of special concern due to their recalcitrance and persistence in the environment. In recent years, various methods for heavy metal removal from wastewater have been extensively studied. This paper reviews the current methods that have been used to treat heavy metal wastewater and evaluates these techniques. These technologies include chemical precipitation, ion-exchange, adsorption, membrane filtration, coagulation-flocculation, flotation and electrochemical methods. About 185 published studies (1988-2010) are reviewed in this paper. It is evident from the literature survey articles that ion-exchange, adsorption and membrane filtration are the most frequently studied for the treatment of heavy metal wastewater. Copyright Â© 2010 Elsevier Ltd. All rights reserved.

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Seven chemical separations to change the world

David S Sholl, Ryan Lively (2016)

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Sustainable technologies for water purification from heavy metals: review and analysis

Sreenath Bolisetty, Mohammad Peydayesh, Raffaele Mezzenga (2019)

We review and analyze current water purification technologies in the context of sustainability, and we introduce the Ranking Efficiency Product (REP) index, to evaluate their efficiency and implementation in this broader perspective. Water pollution is a global problem threatening the entire biosphere and affecting the life of many millions of people around the world. Not only is water pollution one of the foremost global risk factors for illness, diseases and death, but it also contributes to the continuous reduction of the available drinkable water worldwide. Delivering valuable solutions, which are easy to implement and affordable, often remains a challenge. Here we review the current state-of-the-art of available technologies for water purification and discuss their field of application for heavy metal ion removal, as heavy metal ions are the most harmful and widespread contaminants. We consider each technology in the context of sustainability, a largely neglected key factor, which may actually play a pivotal role in the implementation of each technology in real applications, and we introduce a compact index, the Ranking Efficiency Product (REP), to evaluate the efficiency and ease of implementation of the various technologies in this broader perspective. Emerging technologies, for which a detailed quantitative analysis and assessment is not yet possible according to this methodology, either due to scarcity or inhomogeneity of data, are discussed in the final part of the manuscript.