新型功能化中空分级微纳结构碳基-AxB3-xO4的可控构筑及其可见光催化机制研究

The objective of this project is to explore a new green synthesis method to design and controlled synthetise a series of functional hollow hierarchical micro-nano structure carbon baseed-AxB3-xO4 photocatalytic materials using environmentally-friendly waste paper napkins/cotton/paper as carbon template, tissue paper/cotton has a unique structure composing of interwoven cellulose fiber network that mainly contains C and O element, which can fast transport photogenerated charge. Hollow hierarchically porous AxB3-xO4/C networks are expected to offer large surface area, accessible mass transport pathway of macoporous network and high catalytic activity. The microstructure characteristic related to catalytic activity will be investigated in detail for revealing the relationship between microstructure and photocatalytic properties of materials. Due to the advances in structure, the visible-light sensitivity and the efficiency of charge carrier separation have been greatly improved by precisely controlling the size, shape, chemical composition and interface of structured materials. The formation mechanism of active species and theirs possible the influencing factors, and the mechanism of photocatalysis enhancement will be intensive studied. The studied of this project not only provides us with a better understanding on the structure performance relationships, but also promotes the potential applications in photocatalysis.

本项目采用“绿色合成”方法，选用“绿色碳源”即环保低碳生活废物（废弃餐巾纸/棉絮/报纸等）构筑碳纳米纤维网毡作为半导体AxB3-xO4的载体，设计、合成功能化的中空分级多孔道微纳结构的系列磁性碳基-AxB3-xO4光催化材料，利用太阳能“绿色光催化技术”降解有机污染物。重点研究碳基- AxB3-xO4结构特性对光催化性能的影响，揭示光催化材料结构特征与光催化活性间的内在联系；研究光生载流子的产生、迁移、复合的变化规律与控制机制，阐明影响光电转化效率的关键因素；探知催化活性粒子的成因机制及影响活性粒子高产出率的条件因素，从微观层面诠释碳基- AxB3-xO4的光催化行为，揭示碳基- AxB3-xO4光催化降解机理，为设计合成可循环利用的高效可见光催化材料提供理论基础，有利于推动光催化绿色技术在污染控制领域的应用。

本项目通过绿色合成方法，巧用环保低碳生活废物（废弃餐巾纸/棉絮/报纸）构筑碳纳米纤维网毡作为半导体AxB3-xO4的载体，设计、合成系列功能化系列磁性碳基-AxB3-xO4（3D FeCo2O4/CCFs, 3D CoMn2O4/CF, 1D/2D NiCo2O4/CFs, 3DNiMn2O4/CCF, 3D Co2SnO4-SnO2/GC, 3D SrFe2O4/RGO, 3D Co3O4@CoO/g-C3N4）光催化材料。构筑的双金属氧化物催化材料具有多维度分级开放的微孔结构和超大的比表面积，促进对污染物的吸附，且它们具有较窄的禁带宽度（≈2.0 eV）， 具有较强的可见光吸收，提高太阳能的利用率；利用碳纳米纤维网的高导电性、高捕获传输光生电子能力，可有效地抑制光生电子与空穴的复合，提升载流子分离效率和光催化效率；有利于提高催化降解效率。通常尖晶石型FeCo2O4、NiCo2O4、NiMn2O4、CoMn2O4等是具有磁性，通过外磁场作用可对光催化材料回收再利用，解决催化材料回收难，易造成二次污染的问题。重点研究3D FeCo2O4/CCFs, 3D CoMn2O4/CF, 1D/2D NiCo2O4/CFs, 3DNiMn2O4/CCF, 3D Co2SnO4-SnO2/GC, 3D SrFe2O4/RGO, 3D Co3O4@CoO/g-C3N4等结构特性对光催化性能的影响，揭示光催化材料结构特征与光催化活性间的内在联系；研究光生载流子的产生、迁移、复合的变化规律与控制机制，阐明影响光电转化效率的关键因素；探知催化活性粒子的成因机制及影响活性粒子高产出率的条件因素，从微观层面诠释碳基-AxB3-xO4的光催化行为，揭示碳基-AxB3-xO4光催化降解机理，为设计合成可循环利用的高效可见光催化材提供理论基础，有利于推动光催化绿色技术在污染控制领域的应用。项目研究成果将有助于推动太阳能处理废水技术的发展,在低碳经济竞争中迈出坚实的一步。