Adsorption of Ni2+ in aqueous solution by KMnO4 modified biomass: investigation on adsorption kinetics and modification mechanism. Issue 18 (11th August 2022)

• Record Type: Journal Article
• Authors: Tong, Yuxing; Yan, Qunshan; Gao, Song; Xiong, Bin; Tang, Xiangbing; Liu, Zhichang; Li, Pengfei; Huang, Ming; Wang, Ziwei; Le, Xi; Pei, Wei; Dai, Zejun; Xiong, Zhe; Wang, Yi
• Is Part Of: Environmental technology. Volume 43:Issue 18(2022)
• Page Start: 2855
• Page End: 2866
• Publication Date: 2022-08-11
• Subjects: Adsorption -- Ni2+ -- KMnO4 modification -- Biomass -- Water treatment; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2021.1906328
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: In this study, KMnO4 modification was proved to effectively increase the Ni 2+ adsorption capacity of biomass. In order to clarify the KMnO4 modification mechanism, the Ni 2+ adsorption characteristics of KMnO4 modified corncob (PPCB) under adsorption time, pH and Ni 2+ 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 Ni 2+ 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 Ni 2+ adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni 2+ 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. GRAPHICAL ABSTRACT: UF0001