可见光辐照下 BiMoO 活化过一硫酸盐降解莠去津。
Degradation of atrazine by BiMoO activated peroxymonosulfate under visible light irradiation.
机构信息
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.
出版信息
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。
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