Jafari Negar, Ebrahimpour Karim, Abdolahnejad Ali, Karimi Mahbobe, Ebrahimi Afshin
1Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
2Environment Research Center, Research Institute for Primordial Prevention of Non-communicable disease, Isfahan University of Medical Sciences, Isfahan, Iran.
J Environ Health Sci Eng. 2020 Jan 2;17(2):1171-1183. doi: 10.1007/s40201-019-00432-4. eCollection 2019 Dec.
Microcystin-Leucine Arginine (MC-LR) is one of the most studied cyanotoxins due to its toxicity and abundant that cause health hazards for humans through of the drinking water. In this study, BiVO/TiO nanocomposite was synthesized by hydrothermal method and employed for the removal of MC-LR. The characteristics of the catalysts were determined by FESEM, XRD and FTIR spectra. Response surface methodology (RSM) was applied to assess the effects of operating variables (pH, contact time, and catalyst dose) on the MC-LR removal. The coefficient of determination (R) was calculated 98.7% for the response. The residual concentration of MC-LR was measured by high-performance liquid chromatography (HPLC). The results show that the highest removal efficiency of MC-LR was 98% under the optimum conditions (pH = 5, contact time = 90 min, and catalyst dose = 0.5 g/l). MC-LR decomposition efficiency by BiVO/TiO nanocomposite was enhanced by pH reduction and increasing of contact time and catalyst dose. The prepared BiVO/TiO nanocomposite with technological potential can be used directly in environmental preservation, specifically in the decontamination of MC-LR from aqueous solutions.
微囊藻毒素 - 亮氨酸精氨酸（MC-LR）是研究最多的蓝藻毒素之一，因其毒性大且含量丰富，可通过饮用水对人类健康造成危害。在本研究中，采用水热法合成了BiVO/TiO纳米复合材料，并用于去除MC-LR。通过场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对催化剂的特性进行了测定。应用响应面法（RSM）评估操作变量（pH值、接触时间和催化剂剂量）对MC-LR去除效果的影响。计算得出响应的决定系数（R）为98.7%。采用高效液相色谱（HPLC）测定MC-LR的残留浓度。结果表明，在最佳条件（pH = 5、接触时间 = 90分钟、催化剂剂量 = 0.5 g/l）下，MC-LR的最高去除效率为98%。降低pH值、延长接触时间和增加催化剂剂量可提高BiVO/TiO纳米复合材料对MC-LR的分解效率。所制备的具有技术潜力的BiVO/TiO纳米复合材料可直接用于环境保护，特别是用于从水溶液中去除MC-LR。
