Adsorption of Malachite Green and Pb 2+ by KMnO 4 -Modified Biochar: Insights and Mechanisms

Hua Deng, Junyu Zhang, Rui Huang, Wei Wang, Mianwu Meng, Lening Hu and Weixing Gan
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Hua Deng: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Junyu Zhang: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Rui Huang: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Wei Wang: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Mianwu Meng: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Lening Hu: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
Weixing Gan: College of Environment and Resources, Guangxi Normal University, Guilin 541004, China

Sustainability, 2022, vol. 14, issue 4, 1-14

Abstract: In this study, the feasibility and mechanism of Pb 2+ and malachite green (MG) adsorption from wastewater using KMnO 4 -modified bamboo biochar (KBC) was evaluated. The KBC was characterized by SEM–EDS, XRD, FTIR and XPS. The adsorption results for Pb 2+ conformed to pseudo-second-order kinetics and the Langmuir model theory. Unlike the case for Pb 2+ , the Freundlich model better described the adsorption behaviour of MG, indicating that adsorption occurred within multiple molecular layers. Both pseudo-first-order kinetics and pseudo-second-order kinetics fit the MG adsorption data well, indicating that physical adsorption was involved in the adsorption process. In addition, the maximum adsorption capacity for Pb 2+ /MG was 123.47/1111.11 mg·g −1 , KBC had high adsorption capacities for Pb 2+ and MG, and the mechanisms of Pb 2+ adsorption were mineral precipitation, functional group complexation, and cation-π interactions, while the main mechanisms for MG adsorption were pore filling, π–π interactions, and functional group complexation. In this study, KMnO 4 -modified biochar was prepared and used as an efficient adsorbent, and showed good application prospects for treatment of wastewater containing MG and Pb 2+ .

Keywords: bamboo biochar; KMnO 4 modified; MG; Pb 2+; adsorption mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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