State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China.
Laboratory of Wastewater Treatment Technology in Sichuan Province, Haitian Water Group, China.
J Hazard Mater. 2020 Dec 5;400:123187. doi: 10.1016/j.jhazmat.2020.123187. Epub 2020 Jun 12.
In this study, bismuth molybdate (BiMoO) nanosheets were prepared via a facile hydrothermal method and applied to activate peroxymonosulfate (PMS) for atrazine (ATZ) elimination under visible light irradiation. An effective photocatalytic synergy was observed in vis/BiMoO/PMS system. The BiMoO catalyst showed an excellent stability and extremely low metal leaching in the vis/BiMoO/PMS system which were characterized by XRD, XPS, HRTEM, SEM and FT-IR technologies. Besides, the influence of operation parameters (i.e., BiMoO dosage, PMS concentration, initial pH, ATZ concentration, co-existing anions, and humic acid) on the removal of ATZ were also investigated in detail. The best ATZ degradation efficiency (> 99 %) was obtained with BiMoO dosage of 0.6 g/L, PMS concentration of 0.8 mM, and ATZ concentration of 2.5 mg/L after 60 min. UV-vis DRS and Mott-Schottky analysis were taken to evaluate the band structure of BiMoO. Trapping experiments and EPR detection demonstrated that superoxide radicals, hydroxyl radicals, sulfate radicals and h both contributed to ATZ degradation, of which hydroxyl radical OH) and h were the major species. Besides, the performance of vis/BiMoO/PMS system for different pollutant removal was also investigated. Finally, the possible degradation products were monitored by UPLC-QTOF-MS/MS and the pathways of ATZ degradation were put forward. Overall, the vis/BiMoO/PMS system shows the potential for the removal of organic pollutants in environmental remediation.
在这项研究中，通过简便的水热法制备了钼酸铋（BiMoO）纳米片，并将其用于在可见光照射下激活过一硫酸盐（PMS）以去除莠去津（ATZ）。在 vis/BiMoO/PMS 体系中观察到有效的光催化协同作用。BiMoO 催化剂在 vis/BiMoO/PMS 体系中表现出极好的稳定性和极低的金属浸出，这通过 XRD、XPS、HRTEM、SEM 和 FT-IR 技术进行了表征。此外，还详细研究了操作参数（即 BiMoO 剂量、PMS 浓度、初始 pH 值、ATZ 浓度、共存阴离子和腐殖酸）对 ATZ 去除的影响。在 60 分钟后，当 BiMoO 剂量为 0.6 g/L、PMS 浓度为 0.8 mM 和 ATZ 浓度为 2.5 mg/L 时，可获得最佳的 ATZ 降解效率（>99%）。UV-vis DRS 和 Mott-Schottky 分析用于评估 BiMoO 的能带结构。捕获实验和 EPR 检测表明，超氧自由基、羟基自由基、硫酸根自由基和 h+都有助于 ATZ 降解，其中羟基自由基（OH）和 h+是主要物种。此外，还研究了 vis/BiMoO/PMS 体系对不同污染物去除的性能。最后，通过 UPLC-QTOF-MS/MS 监测了可能的降解产物，并提出了 ATZ 降解的途径。总体而言，vis/BiMoO/PMS 体系显示出在环境修复中去除有机污染物的潜力。
