GO/(CeO2-TiO2)改性复合膜紫外光催化去除氨氮、DOC

以二氧化铈-二氧化钛（CeO₂-TiO₂）、氧化石墨烯-二氧化铈（GO-CeO₂）、氧化石墨烯-二氧化钛（GO-TiO₂）和氧化石墨烯/二氧化钛-二氧化铈[GO/（CeO₂-TiO₂）]为改性物质，借助真空过滤法对聚偏氟乙烯（PVDF）微滤膜进行改性制备复合膜，利用X射线粉末衍射仪、紫外可见漫反射、扫描电子显微镜、傅里叶红外变换光谱等手段探究了复合膜的结构和光吸收能力.选择常州太湖支浜水样作为原水，研究了复合膜在黑暗及紫外光条件下对氨氮及DOC的去除效果.结果表明，黑暗条件下，（GO-CeO₂）复合膜氨氮去除率最高可达到28.21%，GO/（CeO₂-TiO₂）复合膜DOC去除率最高达29.58%；紫外光条件下，GO、CeO₂、TiO₂间的协同作用使得GO/（CeO₂-TiO₂）复合膜氨氮（65.4%）及DOC （54.7%）去除效果最佳.

Ultraviolet photocatalytic removal of ammonia nitrogen and DOC by GO/(CeO2-TiO2) modified composite membrane

The polyvinylidene fluoride (PVDF) microfiltration membrane was modified by vacuum filtration method with cerium oxide-titanium dioxide (CeO₂-TiO₂), graphene oxide-cerium dioxide (GO-CeO₂), graphene oxide-titanium dioxide (GO-TiO₂) and graphene oxide/titanium dioxide-cerium oxide[GO/(CeO₂-TiO₂)], respectively, to prepare composite membranes. The structure and light absorptivity of the composite membranes were investigated by X-ray diffraction, ultraviolet visible diffuse reflection, scanning electron microscopy and Fourier transform infrared spectroscopy. The removal efficiencies of ammonia nitrogen and DOC by composite membranes under dark and ultraviolet light conditions were studied by using the lake water samples from GehuLake branch in Changzhou as raw water. Under dark condition, (GO-CeO₂) composite membrane had the highest removal efficiency of ammonia nitrogen (28.21%) and GO/(CeO₂-TiO₂) composite membrane had the highest removal efficiency of DOC (29.58%). Under ultraviolet light condition, the synergistic effect ofGO, CeO₂ and TiO₂ resulted in the best removal effect of ammonia nitrogen (65.4%) and DOC (54.7%) byGO/(CeO₂-TiO₂) composite membrane.