Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
Ecotoxicol Environ Saf. 2020 Nov;204:111112. doi: 10.1016/j.ecoenv.2020.111112. Epub 2020 Aug 13.
Compared with conventional methods for organic pollutant degradation, photocatalysis is a promising treatment technology with broad application prospects. BiOCO is often used for organic pollutants degradation but greatly restricted by having drawbacks of large band gap and high electron-hole recombination rate. Herein, heterostructured BiOCO (BOC)/reduced graphene oxide (rGO)/polydopamine (PDA) (BGP) photocatalysts were first designed through a green chemical method. By incorporating rGO and PDA in BOC, the kinetic constant of BGP to catalytically degrade methyl orange (MO) was significantly increased; over fourfold elevated rather than that of BOC (k = 0.0019, k = 0.0089) due to the high electron transfer capability of rGO and superior adhesive force and semiconducting properties of PDA. DRS and photoelectrochemical results confirmed the improvement of the light absorption range and charge transfer capability because of the synergistic effect of rGO and PDA. Results of trapping experiment and ESR unraveled the catalytic mechanism that both holes (h) and superoxide radicals (•O) were the main oxidative species for MO degradation. Economic assessment results demonstrated that BiOCO/rGO/PDA heterojunctions have great potentials in the field of organic wastewater purification. This study developed a low-cost and highly efficient BGP material and provided a deep understanding of the structure-performance relationships of materials for organic pollutant degradation.
与传统的有机污染物降解方法相比，光催化是一种很有前途的处理技术，具有广阔的应用前景。BiOCO 常用于有机污染物降解，但由于带隙较大和电子-空穴复合率高，其应用受到很大限制。本文首次通过绿色化学方法设计了 BiOCO（BOC）/还原氧化石墨烯（rGO）/聚多巴胺（PDA）（BGP）异质结构光催化剂。通过在 BOC 中掺入 rGO 和 PDA，BGP 催化降解甲基橙（MO）的动力学常数显著提高；由于 rGO 具有高电子传输能力和 PDA 的优异粘附力和半导体性能，比 BOC 提高了四倍以上（k = 0.0019，k = 0.0089）。DRS 和光电化学结果证实了 rGO 和 PDA 的协同效应提高了光吸收范围和电荷转移能力。捕获实验和 ESR 的结果揭示了催化机制，即空穴（h）和超氧自由基（•O）都是 MO 降解的主要氧化物种。经济评估结果表明，BiOCO/rGO/PDA 异质结在有机废水净化领域具有巨大的潜力。本研究开发了一种低成本、高效的 BGP 材料，并深入了解了材料在有机污染物降解方面的结构-性能关系。
