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DOI: https://doi.org/10.4491/eer.2020.575
Efficient adsorption capability of banana and cassava biochar for malachite green: Removal process and mechanism exploration
Hua Deng1,2, Ya Fen Li1,2, Shu Qi Tao1,2, An Yu Li1,2, Qiu Yan Li1,2, and Le Ning Hu1,2
1College of Environment and Resources, Guangxi Normal University, Guilin, Guangxi 541004, China
2Guangxi Normal University Key Laboratory of Karst Ecology and Environmental Change, Guilin, Guangxi 541004, China
Corresponding Author: Hua Deng ,Email: denghua@mailbox.gxnu.edu.cn; hulening@126.com
Le Ning Hu ,Email: denghua@mailbox.gxnu.edu.cn; hulening@126.com
Received: October 15, 2020;  Accepted: May 1, 2021.
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ABSTRACT
In this study, banana biochar (BB) and cassava biochar (CB) were roasted in a tube furnace at 400℃ for 2 h, and their adsorption effects on malachite green (MG) were studied. The removal of MG with respect to the solution concentration and reaction time was also investigated. The results show that the optimal amount of biochar is 2 g/L. Studies of the adsorption kinetics and adsorption isotherms show that the pseudo-second-order kinetics can most accurately reflect the adsorption process. Freundlich model fits the experimental data well. The theoretical saturated adsorption capacities of BB and CB are 1,092.80 mg/g and 261.42 mg/g, respectively. SEM-EDS, TGA, BET, FTIR, XRD, element analysis and other characterization techniques were used to explore the adsorption mechanism. Based on the characterization results, it is speculated that the adsorption of BB and CB for MG mainly includes chemical adsorption and physical adsorption.
Keywords: Adsorption | Adsorption mechanisms | Biochar | Biomass materials | Malachite Green
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