A comprehensive study on modified-pillared clays as an adsorbent in wastewater treatment processes

Autor: Neda Asasian-Kolur, Samira Farajfaed, Seyedmehdi Sharifian, Sheida Zolgharnian, Hanieh Najafi, Seyed Heydar Mosavi Mirak
Rok vydání: 2021
Předmět:
Zdroj: Process Safety and Environmental Protection. 147:8-36
ISSN: 0957-5820
DOI: 10.1016/j.psep.2020.09.028
Popis: Pillared clays are special kinds of modified clays with significant and permanent porosity, produced by embedding columns or pillars between the layers of clay. However, these materials are very well-known for their catalytic properties; their adsorptive characteristics in wastewaters towards different classic and growing contaminants need to be studied comprehensively. The present work is performed to introduce different methods for clays' pillaring, the main steps of the process, comparison of various pillaring agents, etc. During recent years, several investigations have been carried out to find a way for pillared clays' modification (by introducing active chemical functional groups, doping, heat treatment, etc.) to achieve selective adsorbents towards specific pollutants. Therefore, the main modification techniques including surfactant modification, metal doping, etc. are introduced and classified in the present work. Furthermore, adsorptive applications of (modified) pillared clays towards organic, pharmaceutical, and metal ions pollutants, the relationship between physicochemical properties and adsorption performance of pillared clays, adsorption mechanisms, and quantitative comparison of pillared clays' ability for pollutants removal are the other issues that have been considered in the present work.
Databáze: OpenAIRE
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