磁性纳米复合新材料深度处理城市中水难降解有机污染物及其机制

Removal of hazardous recalcitrant organic pollutants is the key difficulty for advanced treatment of municipal sewage secondary effluent (MSSE) to produce high quality reclaimed water. In that respect, it is needed to further develop more cost-effective photo-catalysts. .The current project is aimed to prepare cost-effective novel magnetic nanocomposite catalysts to excite water molecules and dissolved oxygen to produce reactive free radicals, making use of the UV-vis energy in sunlight, and carry out systematic research on the degradation of hazardous recalcitrant organic pollutants in MSSE. The photo-catalytic efficiency of the as-prepared catalysts will be optimized to find out the best preparation conditions; the characterization of the catalysts will be conducted by using XRD, SEM, BET, FT-IR and XPS techniques; ESR technique and free radical scavenging test will be applied to investigate the formation scheme of the reactive radicals in the system; IC, HPLC, GC-MS and UPLC-MS will be used to identify the reaction byproducts based on which the degradation mechanisms involved are supposed to be postulated. Finally, the interaction mechanisms on the surface of the catalysts will be proposed. .The current project is expected to prepare novel high efficiency-magnetic nanocomposite catalysts, and it will provide scientific explanation for improving the treatment efficiency of harzadous organic pollutants in the MSSE and further revealing the mechanisms involved in the photo-catalyzed degradation of organic pollutants.

有害难降解有机污染物的去除是深度处理城市中水、生产高品质再生水的关键和难点，为此特别需要进一步研发更为经济高效的光催化剂。.本项目拟制备经济高效的磁性纳米复合新型催化剂，利用太阳光中紫外-可见光波段能量激发水分子及溶解氧产生活性自由基，以系统开展对城市中水难降解有机污染物的催化降解研究。对所制备新型催化材料的光催化降解性能进行优化，确定最佳制备条件；使用XRD、SEM、BET、FT-IR及XPS等手段表征催化剂表面特性，通过ESR和自由基抑制法等对体系中自由基进行检测，研究体系中自由基生成机理；利用IC、HPLC、GC-MS及UPLC-MS等手段对城市中水有机污染物及光催化降解产物进行分析，推测降解机理并揭示催化剂表面反应机制。.本研究有望制备经济高效磁性纳米复合新型催化剂对城市中水进行有效处理，并为提高其深度处理效率生产高品质再生水、进一步揭示光催化降解有机污染物的作用机制提供科学依据。

有害难降解有机污染物的去除是深度处理城市中水、生产高品质再生水的关键和难点，为此特别需要进一步研发更为经济高效的光催化剂。. 本项目研究成功制备了经济高效的纳米γ氧化铝负载钨酸光催化剂、磁性纳米γ氧化铝负载钨-铁氧化物光催化剂以及纳米γ氧化铝负载铁氧化物类芬顿催化剂等新型复合催化材料，利用太阳光中紫外-可见光波段能量激发水分子及溶解氧产生活性自由基，系统开展了对再生水中难降解有机污染物（1,4-二噁烷）的催化降解研究。对所制备新型催化材料的光催化降解性能进行优化，确定了最佳制备条件；使用SEM-EDS、氮气吸脱附测试、XRD、XPS等手段表征催化剂表面特性，通过自由基抑制法等对体系中自由基进行检测，研究了体系中自由基生成机理；利用IC、GC-MS及UPLC-MS等手段对城市中水有机污染物及光催化降解产物进行分析，推测了降解机理并揭示了催化剂表面反应机制。另外，还深入研究了过硫酸盐高级氧化体系中难降解有机污染物环烷酸的降解机理。. 本研究通过制备经济高效纳米复合新型催化剂对城市中水进行有效处理，并在其他高级氧化体系降解有害有机污染物机理方面进行了新的探索研究，为提高深度处理效率生产高品质再生水、进一步揭示光催化降解有机污染物的作用机制提供科学依据。