Simultaneous removal of Cr(VI) and TC over BiO1−XBr/CeVO4 S-scheme heterostructures: oxygen vacancy boosted charge separation and analysis of intermediates,Environmental Science: Nano

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Simultaneous removal of Cr(VI) and TC over BiO1−XBr/CeVO4 S-scheme heterostructures: oxygen vacancy boosted charge separation and analysis of intermediates
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-08-24 , DOI: 10.1039/d2en00596d
Haochun Zhang ₁ , Ruyao Chen ₁ , Xiufeng Zhou ₂ , Yuming Dong ₃ , Yigang Chen ₄ , Haifeng Shi _{1,

2}

Affiliation

The exploration of simultaneous photocatalytic removal of chromium (Cr(VI)) and tetracycline (TC) in sewage is still rare. Herein, oxygen vacancy (OV)-rich BiO_1−XBr/CeVO₄ (3 : 1) (3BOr–CeV) S-scheme composite dual-responsive photocatalysts were successfully synthesized. The photocatalytic degradation rate of TC over 3BOr–CeV was 4.90 times and 1.67 times higher than those over CeVO₄ (CeV) and BiO_1−XBr (BOr). Meanwhile, the reduction rate of Cr(VI) over 3BOr–CeV reached about 74.20 and 3.51 times compared with those over CeV and BOr. Interestingly, the synergistic photocatalytic activity of 3BOr–CeV was enhanced, and the reduction ability for Cr(VI) was increased by 2.03 times in the mixed system. Such gratifying catalytic activities were attributed to the enhanced charge trapping and light absorption capacity by OVs, together with the strong redox capability and streamlined photoinduced charge separation ability in the S-scheme. The pathway of TC degradation in complex solution systems was monitored by liquid chromatography-mass spectrometry (LC-MS). The DFT calculations, XPS, and PL indicated that the S-scheme heterojunction could promote the separation of charge carriers. In addition, EPR, UV-vis DRS, and finite element calculations demonstrated that the OVs could broaden the light absorption range and capture the charge carriers. This work provided a promising way to modulate the application of S-scheme heterojunction photocatalysts to degrade mixed wastewater.

中文翻译：

在 BiO1−XBr/CeVO4 S 型异质结构上同时去除 Cr(VI) 和 TC：氧空位促进电荷分离和中间体分析

同时光催化去除污水中铬(Cr( VI ))和四环素(TC)的探索还很少。在此，成功合成了富含氧空位（OV）的BiO _{1− X} Br/CeVO ₄ (3 : 1) (3BOr-CeV) S型复合双响应光催化剂。_{TC在3BOr-CeV上的光催化降解率分别是CeVO 4} (CeV)和BiO _{1- X} Br (BOr)上的4.90倍和1.67倍。同时，Cr( VI )在3BOr-CeV上的还原率分别是CeV和BOr上的74.20倍和3.51倍。有趣的是，3BOr-CeV的协同光催化活性增强，对Cr的还原能力（六) 在混合系统中增加了 2.03 倍。这种令人满意的催化活性归因于 OVs 增强的电荷捕获和光吸收能力，以及 S 方案中强大的氧化还原能力和流线型的光诱导电荷分离能力。通过液相色谱-质谱 (LC-MS) 监测复杂溶液系统中 TC 降解的途径。DFT计算、XPS和PL表明，S型异质结可以促进电荷载流子的分离。此外，EPR、UV-vis DRS 和有限元计算表明，OVs 可以扩大光吸收范围并捕获电荷载流子。这项工作为调节 S 型异质结光催化剂在降解混合废水中的应用提供了一种有前景的方法。

更新日期：2022-08-24

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