Olga D. Arefieva, Lyudmila A. Zemnukhova, Natalya P. Morgun, Viacheslav G. Rybin, Michael A. Tsvetnov, Anastasia A. Kovshun, Alexander E. Panasenko
Air, Soil and Water Research 8 (1), (1 January 2020) https://doi.org/10.1177/ASWR.S31623
KEYWORDS: (2,4-dichlorophenoxy)acetic acid, low-cost sorbents, carbon- and silicon-containing sorbents, rice production wastes, sorption efficiency
Despite reducing the consumption of the pesticide (2,4-dichlorophenoxy)acetic acid (2,4-D), it can still be occasionally found in natural waters. The most effective method for its removal is adsorption on a solid surface using carbonaceous sorbents; however, these sorbents are considered highly priced. Therefore, diverse waste products have been increasingly used in recent years. In this study, the sorption possibility of 2,4-D from aqueous solutions with low concentration (1 µg L−1) of carbon- and silicon-containing sorbents of different nature was investigated. It was observed that precipitated silica from rice husk could be used for sorption posttreatment of 2,4-D. There was almost a complete removal of the pesticide with the carbon sorbent by “Sibunit”. Mesoporous sorbents derived from rice husk and straw showed a sorption efficiency of 23%-35%, indicating their use for treatment of natural waters.