Enhanced simultaneous adsorption of As(<scp>iii</scp>), Cd(<scp>ii</scp>), Pb(<scp>ii</scp>) and Cr(<scp>vi</scp>) ions from aqueous solution using cassava root husk-derived biochar loaded with ZnO nanoparticles
P.T. Tho, Huu Tạp Van, Lan Huong Nguyen, Trung Kien Hoang, Thi Ngoc Tran, Thi Tuyet Nhung Nguyen, Thị Bich Hanh Nguyen, Van Quang Nguyen, Hung Le Sy, Văn Nam Thái, Quoc Ba Tran, Seyed Mohsen Sadeghzadeh, Robabeh Asadpour, Phan Quang Thang
Abstract
, while the best isothermal description followed the Langmuir model. As a result, the adsorption process of heavy metals onto biochars was chemisorption on homogeneous monolayers, which was mainly controlled by cation exchange and surface precipitation mechanisms due to enriched oxygen-containing surface groups with ZnO-NP modification of biochar. The FTIR and EDS analysis data confirmed the important role of oxygen-containing surface groups, which significantly contributed to removal of heavy metals with extremely high adsorption capacities, comparable with other studies. In conclusion, due to very high adsorption capacities for metal cations, the cassava root husk-derived biochar modified with ZnO-NPs can be applied as the alternative, inexpensive, non-toxic and highly effective adsorbent in the removal of various toxic cations.