School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China.
School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China; School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China.
J Hazard Mater. 2021 Apr 5;407:124394. doi: 10.1016/j.jhazmat.2020.124394. Epub 2020 Nov 2.
Recently, the photocatalytic reduction of Cr(VI) has been extensively studied. Herein, we successfully prepared the BiOBr-BiS heterojunctions with high photocatalytic Cr(VI) reduction performance using an ion exchange method. The optimal BiOBr-BiS heterojunction (prepared with BiOBr, pH of 6.0, 2 mmol NaSO·5HO,) achieved 100% removal of Cr(VI) within 12 min. The performance of photo-reduced Cr(VI) was about 28.9 and 184.6 times higher than that of pure BiS and BiOBr, respectively. Besides, BiOBr-BiS heterojunctions had a good adsorption efficiency for Cr(III), suggesting that they could be applied as bifunctional photocatalyst. The formation process and photoelectric properties of the BiOBr-BiS heterojunctions were revealed by a series of characterizations. In conclusion, this work reported the synergistic effect of adsorption and photocatalysis of the BiOBr-BiS heterojunctions for Cr removal for the first time, suggesting that the BiOBr-BiS heterojunctions could act as a novel photocatalytic adsorbent to treat the Cr(VI)-containing wastewater.
最近，人们对 Cr(VI) 的光催化还原进行了广泛的研究。在此，我们通过离子交换法成功制备了具有高光催化 Cr(VI)还原性能的 BiOBr-BiS 异质结。最佳的 BiOBr-BiS 异质结（BiOBr，pH 值为 6.0，2 mmol NaSO·5HO）在 12 min 内实现了 100%的 Cr(VI)去除。光还原 Cr(VI)的性能分别比纯 BiS 和 BiOBr 高出约 28.9 和 184.6 倍。此外，BiOBr-BiS 异质结对 Cr(III)具有良好的吸附效率，表明它们可用作双功能光催化剂。通过一系列表征揭示了 BiOBr-BiS 异质结的形成过程和光电特性。总之，这项工作首次报道了 BiOBr-BiS 异质结在 Cr 去除过程中的吸附和光催化协同作用，表明 BiOBr-BiS 异质结可以作为一种新型的光催化吸附剂来处理含 Cr(VI)废水。
