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Selenium removal from water using adsorbents: A critical review.
Khaled Zoroufchi Benis1, Kerry N McPhedran2, Jafar Soltan1
1Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Journal of Hazardous Materials
|November 13, 2021
Summary
Selenium (Se) contamination in water is a global issue. This review details 112 adsorbents for Se removal, aiding in developing effective water treatment technologies.
Area of Science:
- Environmental Science
- Water Chemistry
- Materials Science
Background:
- Selenium (Se) is an essential micronutrient but toxic in excess, posing a global water contamination challenge.
- Sorption is a viable method for removing aqueous Se, yet a comprehensive review of adsorbent capacities is lacking.
Purpose of the Study:
- To critically review and compile data on the sorption capacities of 112 natural and synthesized adsorbents for selenium remediation.
- To identify research gaps and provide future perspectives for developing efficient Se removal technologies.
Main Methods:
- Literature review of studies published between 2010 and 2021 focusing on selenium remediation using adsorbents.
- Categorization of adsorbents into five groups: clay/waste, iron-based, other metal-based, carbon-based, and others.
- Compilation of adsorbent preparation/modification methods, sorption capacities, and adsorption models/mechanisms.
Main Results:
- Comprehensive tables detailing 112 adsorbents for Se removal, including their properties and performance.
- Analysis of various adsorbent types, highlighting their strengths and limitations for selenium remediation.
- Identification of key research gaps in adsorbent development and application for selenium removal.
Conclusions:
- This review provides a valuable resource for selecting appropriate sorbent media for selenium water treatment.
- It facilitates the development of efficient and practical selenium removal technologies for diverse applications.
- Future research should focus on addressing identified gaps to enhance adsorbent performance for real-world selenium contamination scenarios.
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