低浓度NOx是城市半封闭空间和建筑物内的典型污染物之一，造成了严重的局部空气质量恶化。针对低浓度NOx光催化技术中存在的脱除效率低、可利用光谱范围窄、易失活等问题，本申请采用水热法构建三维结构的纳米石墨烯气溶胶，随后将一维结构的TiO2纳米管负载于GAs的三维骨架上，再负载具有LSPR效应的Pt纳米颗粒，形成Pt/TNTs/GAs三维结构光催化剂用于低浓度NOx的光催化脱除。结合微观形貌和物化性能分析，明晰石墨烯气溶胶的三维结构和脱硝活性之间的关联机制；研究禁带结构、光吸收特性、载流子迁移转化过程和活性物种俘获特性，探明LSPR效应对可见光光催化过程的影响机制；通过产热性能、热导率以及热扫描电镜观测，明确光热效应对整体催化反应的推动程度。研究红外光催化、热催化以及全光光催化模式下NOx降解反应历程，提出三维结构Pt/TNTs/GAs 光催化剂表面的NOx光-热协同催化降解机理。

Low-concentration NOx is one of the typical air pollutants in the city semi-colsed spaces and buildings, which lead to the serious local-air pollutions. Recently, the photocatalyst for the removal of Low-concentration NOx commonly faced many drawbacks, such as low removal efficiency, narrow available spectra and deactivation of NO3-. Aiming to solve these problems, we fabricate the three dimensional graphene aerosol (GAs) by hydrothermal method, and dope one dimensional titania nanotubes and Pt nanoparticles on the three dimensional GAs. Finally, three dimensional Pt/TNTs/GAs photocatalysts are synthesized for the removal of NOx. Based on the results of structural characterization and physicochemical property, the relationship between catalysts microstructure and photocatalytic activity will be established. Considering the results of light absorption characteristics, transfer and transportation behaviors of photo-induced charge carriers and trapping of reactive radicals, the visible-light photo-activity enhancement mechanism for the LSPR effect will be revealed. Observing the degradation process of NOx under infrared-light catalytic mode, thermal catalytic mode and simulated sunlight catalytic mode, the photocatalytic & thermal catalytic degradation mechanism of NOx on Pt/TNTs/GAs photocatalyst will be proposed. The research results will also enrich the theory for the removal of Low-concentration NOx.