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Synthesis, characterization and removal performance of Cr (VI) by orange peel-based activated porous biochar from water by Sun Zhengfeng; Chen Ming; Wang Geming; Deng Quanrong; Wang Shenggao; Gao Yuan is a Engineering article available to read on EtoBox.

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A novel high-active porous activated biochar (KC) has been successfully prepared through a two-step chemical activation method with KOH by using orange peel as raw materials. The KC demonstrates several remarkable advantages for Cr (VI) removal from water, including large specific surface area of 1998 m2/g, well-developed porous microstructure, rich oxygen-containing functional groups and abundant surface-active sites. With these merits, the KC exhibits an outstanding experimental absorption capacity of Cr (VI) of 285.5 mg g−1 for 2400 mins at pH 2.0. The influences of initial pH, contact time, concentration and temperature on the remediation are investigated. The adsorption behavior fit well to Elovich model, suggesting a chemical adoption process. The Langmuir model fits better than the Freundlich model in simulating the adsorption isotherm, which implies a monolayer adsorption reaction through chemical adsorption. Mechanism studies demonstrate that chemical adoption, reduction, ion exchange and complexation with the assistance of oxygen-containing functional groups and porosity are involved in removal process of Cr (VI). Our work offers a feasible approach to optimize microstruc

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Author

Sun Zhengfeng; Chen Ming; Wang Geming; Deng Quanrong; Wang Shenggao; Gao Yuan

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)