Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.
Department of Biotechnology, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.
Environ Res. 2018 Oct;166:497-506. doi: 10.1016/j.envres.2018.06.011. Epub 2018 Jun 26.
Biofouling is a major problem in water membrane processes, especially in seawater reverse osmosis plants. Inactivation of Vibrio fischeri (a well-known marine bacterium forming biofilm) through photocatalysis via visible light was investigated in this work using active FeO-TiO nanoparticles. Five FeO-TiO photocatalysts with different weight percentage of FeO (0-5 wt%) were synthesized using an ultrasonic-assisted co-precipitation method. The photocatalysts were characterized by powder X-ray diffraction (XRD), BET surface area, transmission electron Æ (TEM) plus selected area electron diffraction (SAED) patterns, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and diffuse-reflectance spectroscopy (DRS). Based on the design of experiments, the synthesized photocatalysts were tested for inactivation of V. fischeri under visible light irradiation at different temperatures (25-35 °C) and different photocatalyst dosage (0.1-2 g/L). The photocatalytic microbial inactivation experiments were performed in artificial seawater appropriate for growth of the marine bacterium. The results revealed that the highest inactivation efficiency of V. fischeri was achieved when 1 g/L of 2.5 wt% FeO-TiO were used, at 35 °C. Photocatalytic inactivation of microorganisms using visible light-driven FeO-TiO photocatalysts, could introduce an innovative green method in pretreatment units of reverse osmosis plants to control the membrane biofouling.
生物污损是水膜处理过程中的一个主要问题，特别是在海水反渗透工厂中。本工作采用可见光下的光催化作用，研究了活性 FeO-TiO 纳米粒子对海洋细菌 Vibrio fischeri（形成生物膜的知名海洋细菌）的灭活作用。使用超声辅助共沉淀法合成了 5 种不同 FeO 重量百分比（0-5wt%）的 FeO-TiO 光催化剂。通过粉末 X 射线衍射（XRD）、BET 比表面积、透射电子显微镜（TEM）加选区电子衍射（SAED）图谱、扫描电子显微镜（SEM）、能量色散 X 射线光谱（EDX）和漫反射光谱（DRS）对光催化剂进行了表征。根据实验设计，在不同温度（25-35°C）和不同光催化剂用量（0.1-2g/L）下，用合成的光催化剂在可见光照射下对 V. fischeri 进行了灭活测试。在适合海洋细菌生长的人工海水中进行光催化微生物灭活实验。结果表明，当使用 1g/L 的 2.5wt%FeO-TiO 时，V. fischeri 的灭活效率最高，温度为 35°C。使用可见光驱动的 FeO-TiO 光催化剂进行微生物光催化灭活，可以在反渗透工厂的预处理单元中引入一种创新的绿色方法来控制膜生物污损。
