Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal

Chemosphere
S S MayakaduwaMeththika Vithanage

Abstract

We investigated the removal of aqueous glyphosate using woody (dendro) biochar obtained as a waste by product from bioenergy industry. Equilibrium isotherms and kinetics data were obtained by adsorption experiments. Glyphosate adsorption was strongly pH dependent occurring maximum in the pH range of 5-6. The protonated amino moiety of the glyphosate molecule at this pH may interact with π electron rich biochar surface via π-π electron donor-acceptor interactions. Isotherm data were best fitted to the Freundlich and Temkin models indicating multilayer sorption of glyphosate. The maximum adsorption capacity of dendro biochar for glyphosate was determined by the isotherm modeling to be as 44 mg/g. Adsorption seemed to be quite fast, reaching the equilibrium <1 h. Pseudo-second order model was found to be the most effective in describing kinetics whereas the rate limiting step possibly be chemical adsorption involving valence forces through sharing or exchanging electrons between the adsorbent and sorbate. The FTIR spectral analysis indicated the involvement of functional groups such as phenolic, amine, carboxylic and phosphate in adsorption. Hence, a heterogeneous chemisorption process between adsorbate molecules and functional gr...Continue Reading

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Citations

Sep 23, 2016·Environmental Science & Technology·Kyle A ThompsonSherri M Cook
Jan 24, 2017·Pest Management Science·Kathleen E HallWilliam C Koskinen
Sep 16, 2017·Bulletin of Environmental Contamination and Toxicology·Tianye ZhengAnnemieke Farenhorst
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May 17, 2018·Environmental Science and Pollution Research International·Yajuan LiYuesuo Yang
Nov 2, 2017·Environmental Science and Pollution Research International·Lulu ZhaoYing Zhang
Sep 12, 2019·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Oluwaranti Olubunmi OloladePelumi Adanigbo
Aug 19, 2017·Environmental Geochemistry and Health·Awanthi WathukarageMeththika Vithanage
Nov 10, 2020·Environmental Science and Pollution Research International·Joshua O IghaloMary A Ajala
Dec 2, 2020·Environmental Pollution·Sammani RamanayakaMeththika Vithanage
Jul 7, 2020·The Science of the Total Environment·Dan FengOlivier Boutin
Mar 18, 2021·Environmental Monitoring and Assessment·Quésia Sá PavãoDaniel Valadão Silva
Nov 13, 2021·Environmental Science and Pollution Research International·Shuang HanDedong Wu

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