Visible light photo-treatment of simulated wastewater activated by high-efficient photocatalyst: A novel heterojunction of Bi2MoO6 balls and Pd nanoskeletons
Visible light photo-treatment of simulated wastewater activated by high-efficient photocatalyst: A novel heterojunction of Bi2MoO6 balls and Pd nanoskeletons
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高效光催化剂激活模拟废水的可见光光处理：Bi2MoO6 球和 Pd 纳米骨架的新型异质结
DOI：
10.1016/j.apsusc.2020.145468
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发表时间：
2020
影响因子：
6.7
通讯作者：
Peng Yang
中科院分区：
文献类型：
--
作者：
Huiyong Li;Zemin Zheng;Mofan Liu;Hao Jiang;Dafeng Hu;Xudong Zhang;Lei Xia;Xuemin Geng;Jiangwei Lu;Xinran Cheng;Yanfen Wan;Peng Yang
采用水热法制备了新型钯纳米骨架修饰的Bi2MoO6balls光催化剂。多种技术表征表明复合催化剂具有优异的光吸收性能和有效的光生电子空穴对分离性能，进一步证明了其优越的光催化性能。与纯bi2moo6纳米片、碳量子点（CQDs）修饰的bi2moo6球和Pd纳米粒子（Pd NPs）修饰的bi2moo6球催化剂相比，1.3% Pd NSs@Bi2MoO6sample在可见光照射下对甲基橙（MO）、亚甲基蓝（MB）、K2Cr2O7、苯酚以及前三者形成的模拟废水混合物表现出最佳的催化性能。最重要的是，对MO的降解效率比纯Bi2MoO6balls提高了约5倍。这主要得益于接触边较多的Pd NSs，在催化体系中具有更好的近红外光吸收能力，为有机染料分子的吸附反应提供了更多的活性位点。通过ESR技术和捕集试验验证了反应中主要参与的活性物质，主要包括自由基dotO2−、空穴、自由基dotOH等，并提出了可能的光催化反应机理和污染物降解途径。
A novel Pd nano-skeleton (Pd NSs) modified Bi2MoO6balls photocatalyst was prepared by a facile hydrothermal treatment. The characterization by multiple techniques demonstrated the excellent light absorption and effective photo-generated electron-hole pairs separation performance of the composite catalyst, which further proved its superior photocatalytic property. Compared to the pure Bi2MoO6nanosheets, carbon quantum dots (CQDs) modified Bi2MoO6balls and Pd nanoparticles (Pd NPs) modified Bi2MoO6balls catalysts, 1.3% Pd NSs@Bi2MoO6sample exhibited the optimal catalytic performance for removing methyl orange (MO), methylene blue (MB), K2Cr2O7, phenol and the simulated wastewater mixture formed by the first three above under the illumination of visible light. Above all, the degradation efficiency increased about 5 times that of the pure Bi2MoO6balls for the degradation of MO. This great improvement was mainly attributed to Pd NSs with many contact edges, which provided more active sites for the adsorption reaction of organic dye molecules, following its better near-infrared light absorption capacity in the catalytic system. The active species mainly involved in the reaction were verified by ESR technique and the trapping test, mainly involvingradical dotO2−, holes,radical dotOH, etc., and a possible photocatalytic reaction mechanism and pollutant degradation pathway were also proposed.