State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Sci Total Environ. 2021 Jan 15;752:141901. doi: 10.1016/j.scitotenv.2020.141901. Epub 2020 Aug 22.
Bifunctional BiOCl/MIL-100(Fe) composite (BMx) was firstly constructed via facile ball-milling method. The optimal BM200 was highly efficient for Cr(VI) sequestration and activation of persulfate (PS) for bisphenol A (BPA) decomposition under white light illumination, which was much more remarkable than the pristine MIL-100(Fe) and BiOCl, respectively. Furthermore, the photocatalytic reduction efficiency can be significantly improved via the addition of some green small organic acids (SOAs). As well, the BPA degradation can be achieved over an extensive initial pH range of 3.0-11.0. When the PS concentration increased to more than 2.0 mM, the BPA degradation efficiency decreased due to the SO• self-scavenging effect. It was also found that the co-existence of inorganic anions like HPO, HCO, SO, Cl and NO could decelerate the BPA degradation. The excellent photocatalytic Cr(VI) reduction and persulfate activation performances originated from both MIL-100(Fe) with excellent PS activation ability and BiOCl with a favorable band position, which not only enabled the efficient separation of charges but also accelerated the formation of SO• radicals. The BM200 displayed prominent stability and recyclability. More importantly, the credible degradation pathway was proposed based on UHPLC-MS analysis and DFT calculation. This research revealed that the Fe-based MOFs/bismuth-rich bismuth oxyhalides (BiOX, X = Cl, Br and I) composites possessed great potential in wastewater remediation.
双功能 BiOCl/MIL-100(Fe) 复合材料 (BMx) 首先通过简便的球磨法构建。最优的 BM200 对 Cr(VI) 的螯合和过硫酸盐 (PS) 的激活具有高效性，可用于双酚 A (BPA) 在白光照射下的分解，分别比原始的 MIL-100(Fe) 和 BiOCl 更为显著。此外，通过添加一些绿色小分子有机酸 (SOAs)，可以显著提高光催化还原效率。同样，BPA 降解可以在广泛的初始 pH 值范围 3.0-11.0 内实现。当 PS 浓度增加到超过 2.0 mM 时，由于 SO•的自猝灭效应，BPA 降解效率会降低。还发现无机阴离子如 HPO、HCO、SO、Cl 和 NO 的共存会减缓 BPA 的降解。优异的光催化 Cr(VI) 还原和过硫酸盐激活性能源于 MIL-100(Fe) 具有优异的 PS 激活能力和 BiOCl 具有良好的能带位置，这不仅实现了有效的电荷分离，而且加速了 SO•自由基的形成。BM200 表现出突出的稳定性和可回收性。更重要的是，基于 UHPLC-MS 分析和 DFT 计算提出了可靠的降解途径。这项研究表明，基于 Fe 的 MOFs/富铋的铋氧卤化物 (BiOX，X=Cl、Br 和 I) 复合材料在废水处理中具有巨大的潜力。
