The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
Colloids Surf B Biointerfaces. 2018 Jan 1;161:528-536. doi: 10.1016/j.colsurfb.2017.11.019. Epub 2017 Nov 8.
BiMoO-AgBr hybrid photocatalyst was synthesized via a mixed solvothermal-precipitation method. The as-synthesized photocatalysts were well characterized by Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopic (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX), high resolution transmission electron microscope (HRTEM), UV-vis diffuse reflectance spectra (DRS), as well as photoluminescence spectra (PL). The visible light driven (VLD) disinfection activity of BiMoO-AgBr was tested using Escherichia coli as the model bacteria. Complete disinfection of 3×10 CFU mL viable cell density was observed in 90min under visible light irradiation for BiMoO-AgBr with the optimal AgBr amount. Ag released from the photocatalysts did not affect the inactivation process due to the low concentration. Whereas, photo-generated holes, HO and O were the main active species involved in the photocatalytic disinfection reaction. The presence of O and direct contact between photocatalysts and bacterial cells were found to be indispensable for the cell inactivation. In addition, neutral and slight alkaline conditions was beneficial for the disinfection process.
采用混合溶剂热沉淀法合成了 BiMoO-AgBr 杂化光催化剂。通过粉末 X 射线衍射（XRD）、X 射线光电子能谱（XPS）、扫描电子显微镜（SEM）配备能量色散 X 射线光谱（EDX）、高分辨率透射电子显微镜（HRTEM）、紫外可见漫反射光谱（DRS）和光致发光光谱（PL）对合成的光催化剂进行了很好的表征。以大肠杆菌为模型细菌，测试了 BiMoO-AgBr 在可见光驱动（VLD）下的消毒活性。在可见光照射下，最佳 AgBr 用量的 BiMoO-AgBr 在 90min 内可完全杀灭 3×10 CFU mL 活菌密度。由于浓度低，光催化剂中释放的 Ag 不会影响失活动力学。然而，光生空穴、HO 和 O 是参与光催化消毒反应的主要活性物质。发现 O 的存在和光催化剂与细菌细胞之间的直接接触对于细胞失活是必不可少的。此外，中性和弱碱性条件有利于消毒过程。
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