锌基多元硫化物/RGO的控制合成及可见光催化-膜分离体系性能研究

Perfluorooctanoic acid (PFOA) as a kind of persistent organic pollutant existing in water system is a threat to human health and ecological safety, which has attracted extensive attention in recent years. PFOA is difficult to remove by traditional physical, chemical and biological treatments. This project will develop a series of metal doped zinc-based multiple sulfide/reduced graphene oxide (RGO) composite visible-light photocatalysts with high catalytic activity and stability, and build a sort of efficient and stable wastewater treatment technology of photocatalysis-membrane filtration. Previous research results indicated that the Fe-ZnS photocatalysts synthesized by microwave hydrothermal method had a good catalytic degradation performance and were successfully combined with microfiltration membrane system, which has testified the feasibility of this project. This study will further control the proportion and variety of doped element and the amount of RGO to synthesize the metal doped zinc-based multiple sulfide/RGO composite photocatalysts by microwave hydrothermal method. The visible-light photocatalysis-membrane filtration hybrid system will be established to fulfill the efficient degradation of PFOA and its metabolic products. The main influence factors and rules of photodegradation and membrane filtration would be identified to discuss the degradation process and mechanism of PFOA by the metal doped zinc-based multiple sulfide/RGO composite photocatalysts. Implement of this project could provide theoretical basis and application value about controlling refractory organic pollutants in water by photocatalysis-membrane filtration technology.

全氟辛酸（PFOA）是近年来备受关注的水体中广泛存在的难降解有机污染物，威胁人体健康和生态安全，传统的物理化学生物处理方法很难将其有效去除。本项目拟开发研制出具有高催化活性和稳定性的锌基多元硫化物/还原性氧化石墨烯（RGO）复合可见光催化材料，建立一种高效、稳定的光催化降解-膜分离处理污水技术。前期研究表明微波水热法控制合成出的Fe-ZnS光催化剂催化活性较高，并与微滤膜体系进行成功耦合，证明了该设计方案的可行性。本项目拟进一步通过微波水热法控制掺杂金属类别及比例和RGO负载量，实现锌基多元硫化物/RGO复合材料的可控合成；构建催化降解-膜分离处理体系，以实现PFOA及其代谢产物的高效降解；识别影响光催化降解和膜分离的主要影响因素及影响规律，探讨锌基多元硫化物/RGO复合材料催化降解PFOA的过程和机理。本项目的实施，对采用光催化-膜分离技术控制水中难降解有机污染物提供理论依据和应用价值。

全氟辛酸（PFOA）是近年来备受关注的水体中广泛存在的难降解有机污染物，威胁人体健康和生态安全，传统的物理化学生物处理方法很难将其有效去除。本项目围绕废水中微量难降解有机污染物的深度去除，研制出具有高催化活性和稳定性的锌基多元硫化物/还原性氧化石墨烯（RGO）复合可见光催化材料，建立一种高效、稳定的光催化降解-膜分离处理污水技术。内容包括：(1)开发了多种可见光响应型复合光催化材料，优化了合成方法；(2)研究了光催化材料的催化性能，建立了光降解有机微污染物的技术；(3)研制了抗污染的光催化超滤膜，并构建了光催化-膜分离联合工艺装置，实现了装置的稳定运行；(4)从理论计算和实验研究两个方面揭示了可见光下催化降解难降解有机污染的作用机制。本研究成果将为光催化-膜分离技术控制水中难降解有机污染物提供科学依据和指导，在废水的高效去除和安全回用领域具有重要的科学意义和应用价值。

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