薄层富羟基高岭石提升g-C_(3)N_(4)光催化去除NO效率的研究

Thin layer hydroxy-rich kaolinite for enhancing photocatalytic removal efficiency of NO by g-C_(3)N_(4)

采用尿素饱和溶液改变高岭石片层厚度制备薄层富羟基高岭石(IK),再与石墨相氮化碳(g-C_(3)N_(4))复合,成功制备了全新光催化材料IKCN。结果表明,薄层高岭石与g-C_(3)N_(4)形成界面化学键,显著提升光催化去除NO活性至74%,是纯g-C_(3)N_(4)的2倍。剥片高岭石暴露出更多层间羟基,增加了g-C_(3)N_(4)与高岭石形成界面化学键的机率和碳空位浓度。界面化学键加快了电子分离与传输,碳空位增强了催化剂表面氧气吸附能力;界面化学键和碳空位的协同作用促进了活性氧自由基的产生,从而提升了IKCN光催化转化NO的效率。

Thin layer hydroxy-rich kaolinite(IK)is prepared through using saturated urea solution to change the thickness of kaolinite sheet,and then compounded with graphite phase carbon nitride(g-C_(3)N_(4))to prepare IKCN successfully,a new photocatalytic material.It is found that the interfacial chemical bonds formed between thin kaolinite and g-C_(3)N_(4)significantly increases the photocatalytic activity of IKCN in NO removal to 74%,which is twice that of pure g-C_(3)N_(4).Stripping kaolinite exposes more inter-layer hydroxyl groups,which increase the probability of forming interfacial chemical bonds between g-C_(3)N_(4)and kaolinite,and the concentration of carbon vacancies.Furthermore,the interfacial chemical bonds accelerate the separation and transfer of electrons,and the carbon vacancy enhances the oxygen adsorption ability on the catalyst surface.The synergistic effect between interfacial chemical bonds and carbon vacancies promotes the generation of reactive oxygen radicals,thereby improving the efficiency of IKCN in photocatalytic conversion to NO.