隧道内壁耐久型CQDs@TiO_(2)自洁净光催化涂层的制备与性能

Preparation and properties of CQDs@TiO_(2) based durable self-cleaning photocatalytic coating for tunnel wall

隧道因其半封闭结构通风不良导致汽车尾气在隧道中大量聚集,从而造成严重的空气污染。本文首先通过一步法将碳量子点(CQDs)负载于一维TiO_(2)纳米管(TNs)表面得到一种具有可见光响应、可高效降解NO的CQDs@TNs复合光催化剂;其次采用喷涂法以环氧树脂为成膜基质,通过引入低表面能组分,以上述光催化剂作为光活性组分,制备得到一种超疏水自清洁光催化涂层。采用SEM、XRD、XPS、BrunauerEmmett-Teller计算(BET)、PL和UV-Vis对复合光催化剂的微观结构和化学组成、光学性能进行表征,并研究了其对NO的光催化降解性能;通过SEM、EDS、表面除灰测试、紫外老化测试、耐水冲测试、砂纸打磨测试对涂层的微观形貌、自清洁性及耐久性进行了系统研究,并探究了其对NO的光降解性能和循环降解性能。结果表明:该涂层具有良好的自清洁性、耐久性,对NO降解率可达42.9%,且具有一定的循环稳定性,可以长期适用于隧道等环境下对NO的降解处理。

Due to semi-closed tubular structure and poor ventilation,automobile exhaust gas accumulates in the tunnel,resulting in serious air pollution.In this paper,firstly,a kind of CQDs@TNs composite photocatalyst with visible light response and efficient degradation of NO was prepared by loading carbon quantum dots(CQDs)on the surface of unidimensional TiO_(2) nanotubes(TNs).Secondly,a super hydrophobic self-cleaning photocatalyst coating was prepared by spraying epoxy resin as the film matrix,introducing low surface energy components and using the above photocatalyst as the photo active component.The microstructure,chemical composition and optical properties of the composite photocatalyst were characterized by SEM,XRD,XPS,Brunauer-Emmett-Teller calculation(BET),PL and UV-Vis,and the NO photodegradation performance was investigated.The microstructure,selfcleaning property and durability of the coating were systematically studied by SEM-EDS,ash adhesion resistance test,UV aging test,water flushing test,sandpaper abrasion test,and the photodegradation property and cyclic degradation performance of NO were also studied.The results show that the coating has good self-cleaning performance and durability,the NO degradation rate reaches 42.9%.Due to its good cycle stability,the coating is expected to be applied to the degradation of NO in tunnels and other semi enclosed environments.