竹炭负载氧化锌对Cr(Ⅵ)的吸附性能和机理

doi:10.16088/j.issn.1001-6600.2022010501

Abstract

Abstract: Zn-modified biochar (ZnBC) was prepared from bamboo biochar by co-precipitation loading ZnO. The adsorption performance of ZnBC for Cr(Ⅵ) in wastewater was investigated by batch experiments. The ZnBC before and after adsorption was characterized by SEM, XRD, FTIR and XPS. The experimental results show that the adsorption of Cr(Ⅵ) by ZnBC is the best at pH=7, reaction time 720 min and reaction temperature 298 K. The adsorption results of Cr(Ⅵ) conform to the pseudo-second-order (PSO) and Langmuir model theory, indicating that the adsorption types are chemical adsorption and monolayer adsorption. The saturated adsorption capacity fitted by Langmuir model is 106.383 mg/g. The coexisting ion experiments show that ZnBC has good selective adsorption for Cr(Ⅵ). The adsorption mechanism of Cr(Ⅵ) by ZnBC mainly includes photocatalytic reduction, functional group complexation, cation-π and precipitation. The results show that ZnBC has great application potential as adsorbent for removing Cr(Ⅵ) from aqueous solution.

Key words: bamboo biochar, co-precipitation, ZnO, Cr(Ⅵ), adsorption mechanism

CLC Number:

X522

DENG Hua, ZHANG Junyu, HUANG Rui, WANG Wei, HU Lening. Adsorption Capacity and Mechanism of ZnO Loading Bamboo Biochar for Cr(Ⅵ)[J].Journal of Guangxi Normal University(Natural Science Edition), 2023, 41(1): 131-142.

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Adsorption Capacity and Mechanism of ZnO Loading Bamboo Biochar for Cr(Ⅵ)

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