双空腔磁性介孔SiO2基光催化剂合成及催化处理制革废水研究

The development of tannery industry has made enormous contribution to human life. However, plenty of polymer compounds and Cr(VI) in tannery wastewater are hard to be treated, and it has been a big environmental challenge. At present, the treatment of organic pollutants (organic nitrogen components) and Cr (VI) still mainly relies on the traditional adsorption and sedimentation technology. These methods cannot thoroughly resolve the pollution problem of tannery wastewater, and direct emission can still lead to the serious pollution to environment. In view of low cost and no secondary pollution of photocatalysis technology, it is expected to be an effective means to resolve tannery wastewater for the effective photodegradation of organic pollution and reduction of Cr(VI) to Cr(III). In this project, a series of novel photocatalysts supported by magnetic mesoporous silica microspheres with double-cavity structure were designed. For the existence of concentration gradient effect, these photocatalysts possess superior photocatalytic performance and super-strong enrichment property of targeted pollutant, and the targeted pollution can be fast enriched and catalytically treated. Furthermore, the reproducibility of photocatalysts can be improved effectively for the superior magnetic separation ability, and the operation cost would be reduced remarkably. Based on this idea, the persistent organic pollutant and Cr (VI) in tannery wastewater are expected to be photocatalytic degraded and reduced, which is very important in theory and practice for the treatment of tannery wastewater.

制革行业的发展为改善人们的生活质量做出了巨大贡献。然而制革废水中含有较多有机污染物及Cr(VI),是目前制革工业面临的一大环境难题。对制革废水中有机污染物（如有机氮等）及Cr(VI)的处理主要通过先吸附再沉降方法来实现，处理不够彻底，直接排放仍会造成严重污染。鉴于光催化技术较低的操作成本且无二次污染，可有效催化有机污染物降解及Cr(VI)还原，有望成为一种处理制革废水的有效手段。基于此，本课题设计了由双空腔磁性介孔SiO2复合微球负载的光催化剂，由于浓度梯度效应，使其具有超强的目标污染物富集特性及优越的光催化性能，从而对目标污染物进行先快速富集再高效催化处理，达到处理更彻底的目的。优越的磁分离特性有效提高了光催化剂再生性，显著降低操作成本。鉴于上述优越性，这类光催化剂有望实现对制革废水中有机污染物及Cr(VI)的高效处理，对制革废水的治理具有理论研究意义和实用价值。

制革行业的发展为改善人们的生活质量做出了巨大贡献。然而制革废水中含有较多有机污染物及Cr(VI),是目前制革工业面临的一大环境难题。对制革废水中有机污染物（如有机氮等）及Cr(VI)的处理主要通过先吸附再沉降方法来实现，处理不够彻底，直接排放仍会造成严重污染。鉴于光催化技术较低的操作成本且无二次污染，可有效催化有机污染物降解及Cr(VI)还原，有望成为一种处理制革废水的有效手段。本项目针对环境领域皮革废水中Cr(VI)及有机污染物对生态环境污染影响问题，在项目经费资助下，通过催化剂结构设计及优化制备出一系列基于异质结策略、等离子体修饰策略、形貌调控策略及单原子体系改良的光催化剂材料，涉及到的催化剂活性组分包括铋基化合物、Ag化合物、过渡金属硫化物（CdS、MoS2、Sb2S3）、TiO2、石墨烯相氮化碳（g-C3N4）、石墨烯材料、CuO、FeOOH、CoP、六方相氮化硼（h-BN）等，通过复配优化、结构调控及与双空腔结构载体结合等手段多角度改善常规半导体光催化剂宽带光波吸收响应及界面电荷分离与传导特性。所合成的系列光催化剂先后在环境与能源领域表现出潜在应用研究价值，如高效的水相Cr(VI)催化还原与分解水氢气生产活性，相关成果在SCI知名杂质被先后报导。其中基于三维多孔骨架构筑及功能助催化剂稳定的相关催化剂先后被《Applied Catalysis B: Environmental》、《Journal of Materials Chemistry A》、《Environmental Science: Nano》、《Chemical Engineering Journal》等期刊报导；基于异质结催化剂构筑的相关研究先后被《Applied Surface Science》、《International Journal of Energy Research》等期刊报导。特别地，通过本项目经费资助，在项目研究过程中发现了简单策略制备金属单原子位点修饰的过渡金属催化剂体系，并在水处理和氢能源生产中表现出超高的催化活性和稳定性，相关成果被《Applied Catalysis B: Environmental》报导，并受到期刊编辑和审稿人高度评价与认可。在本项目资助下，基于课题研究先后发表SCI一区论文15篇，ESI高被引论文1篇，授权发明专利1件。