光催化
吸附
生物炭
甲基橙
水溶液
吸附
橙色G
材料科学
化学
可见光谱
电子顺磁共振
朗缪尔吸附模型
甲基蓝
化学工程
光化学
核化学
催化作用
有机化学
热解
物理
光电子学
核磁共振
工程类
作者
Ying Zhang,Junfeng Chen,Yanan Wang,Han-bo Dou,Zuopeng Lin,Xing Gao,Xueqi Chen,Minghui Guo
标识
DOI:10.1016/j.apsusc.2023.158985
摘要
In order to effectively eliminate organic azo dyes with high concentrations from aqueous environments, novel adsorption/photocatalysis composites were prepared using Cu2O/Ag-coated carriers based on renewable wood-based biochar (MBC). The adsorption process of the prepared MBC@Cu2O/Ag-3 under electrostatic attraction, hydrogen bonding, and complexation effects was conformed to the proposed second-order kinetic model, and the total sorption capacity of Congo red (CR) and methyl orange (MO) reached 263.36 and 177.16 mg g−1, respectively. Moreover, the coordinated interaction of MBC, Cu2O, and Ag enhanced the visible light absorptivity, which further facilitated the effective dissociation of light-generated electrons from holes. The removal rates of CR and MO by MBC@Cu2O/Ag-3 in the presence of visible light were up to 98.4 % and 97.8 %, respectively. In addition, free radical capture and electron spin resonance (ESR) spectroscopy analyses indicated that superoxide (·O2-) and hydroxyl (·OH) radicals were major activators during the photocatalytic progression, and the adsorption/photocatalysis mechanism was elucidated through a series of characterization experiments. This work shows that the utilization of natural biomass materials for the preparation of adsorption/photocatalysis composites with high added value can significantly contribute to water environmental protection and sustainable development.
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