Environment Research Center, Research Institute for Primordial Prevention of Non-communicable disease, Isfahan University of Medical Sciences, Isfahan, Iran and department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
Environment Research Center, Research Institute for Primordial Prevention of Non-communicable disease, Isfahan University of Medical Sciences, Isfahan, Iran and department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
Ecotoxicol Environ Saf. 2021 Mar 1;210:111862. doi: 10.1016/j.ecoenv.2020.111862. Epub 2021 Jan 8.
Microcystin-leucine arginine (MC-LR) is a carcinogenic toxin, produced by cyanobacteria. The release of this toxin into drinking water sources can threaten public health and environmental safety. Therefore, effective MC-LR removal from water resources is necessary. In the present study, the hydrothermal method was used to synthesize a novel ternary BiVO/TiO/NaY-Zeolite (B/T/N-Z) nanocomposite for MC-LR degradation under visible light. FESEM, FTIR, XRD, and DRS were performed for characterizing the nanocomposite structure. Also, the Response Surface Methodology (RSM) was applied to determine the impact of catalyst dosage, pH, and contact time on the MC-LR removal. High-performance liquid chromatography was performed to measure the MC-LR concentration. Based on the results, independent parameters, including contact time, catalyst dosage, and pH, significantly affected the MC-LR removal (P < 0.05). In other words, increasing the contact time, catalyst dosage, and acidic pH had positive effects on MC-LR removal. Among these variables, the catalyst dosage, with the mean square and F-value of 1041.37 and 162.84, respectively, had the greatest effect on the MC-LR removal efficiency. Apart from the interaction between the catalyst dosage and contact time, the interaction effects of other parameters were not significant. Also, the maximum MC-LR removal efficiency was 99.88% under optimal conditions (contact time = 120 min, catalyst dosage = 1 g/L, and pH = 5). According to the results, the B/T/N-Z nanocomposite, as a novel and effective photocatalyst could be used to degrade MC-LR from polluted water.
微囊藻毒素-亮氨酸精氨酸（MC-LR）是一种由蓝藻产生的致癌毒素。这种毒素释放到饮用水源中会威胁到公众健康和环境安全。因此，有必要从水资源中有效去除 MC-LR。在本研究中，采用水热法合成了一种新型的三元 BiVO/TiO/NaY-Zeolite（B/T/N-Z）纳米复合材料，用于可见光下 MC-LR 的降解。采用 FESEM、FTIR、XRD 和 DRS 对纳米复合材料的结构进行了表征。同时，应用响应面法（RSM）确定催化剂用量、pH 值和接触时间对 MC-LR 去除的影响。采用高效液相色谱法测定 MC-LR 浓度。结果表明，独立参数，包括接触时间、催化剂用量和 pH 值，对 MC-LR 的去除有显著影响（P<0.05）。换句话说，增加接触时间、催化剂用量和酸性 pH 值对 MC-LR 的去除有积极影响。在这些变量中，催化剂用量的均方和 F 值分别为 1041.37 和 162.84，对 MC-LR 去除效率的影响最大。除了催化剂用量和接触时间之间的相互作用外，其他参数的相互作用效果并不显著。此外，在最佳条件下（接触时间=120 min，催化剂用量=1 g/L，pH=5），MC-LR 的最大去除效率为 99.88%。结果表明，B/T/N-Z 纳米复合材料作为一种新型高效光催化剂，可用于降解受污染水中的 MC-LR。
