Adsorption of Ni2+ in aqueous solution by KMnO4 modified biomass: investigation on adsorption kinetics and modification mechanism.

Yuxing Tong, Qunshan Yan, Song Gao, Bin Xiong, Xiangbing Tang, Zhichang Liu, Pengfei Li, Ming Huang, Ziwei Wang, Xi Le, Wei Pei, Zejun Dai, Zhe Xiong, Yi Wang

Environmental technology 2022 Jul

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In this study, KMnO4 modification was proved to effectively increase the Ni2+ adsorption capacity of biomass. In order to clarify the KMnO4 modification mechanism, the Ni2+ adsorption characteristics of KMnO4 modified corncob (PPCB) under adsorption time, pH and Ni2+ concentration were studied. The results showed that the adsorption was the pseudo second-order kinetic process, indicating that chemisorption was the dominated process, which followed the Langmuir isotherm model and the highest Ni2+ adsorption capacity of PPCB reached 35.6 mg/g. By KMnO4 modification, the corncob was oxidized to generate carboxylates, and the MnO2 (reduction product) was loaded on the modified corncob, both carboxylates and MnO2 increased the Ni2+ adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni2+ removal efficiency of KMnO4 modified biomass decreased linearly with the increase of lignin content in biomass, while KMnO4 modified lignin showed a good adsorption performance, indicating that the cross-linked structures between lignin and other components in the biomass could inhibit the adsorption capacity of PPCB.

Citation

Yuxing Tong, Qunshan Yan, Song Gao, Bin Xiong, Xiangbing Tang, Zhichang Liu, Pengfei Li, Ming Huang, Ziwei Wang, Xi Le, Wei Pei, Zejun Dai, Zhe Xiong, Yi Wang. Adsorption of Ni2+ in aqueous solution by KMnO4 modified biomass: investigation on adsorption kinetics and modification mechanism. Environmental technology. 2022 Jul;43(18):2855-2866