适用于室内空气净化的规整光催化剂的制备及性能

Preparation and Photocatalytic Properties of Regular Photocatalyst for Indoor Air Purification

用酚醛树脂作前驱物，通过炭化方法在预先成形的金属网上直接制备了炭化物载体，并在其上负载TiO2，经烧结后成为规整型光催化剂。利用XRD、SEM技术对载体和催化剂样品进行了表征。考察了催化剂对气相中苯的光催化降解活性，同时还考察了载体制备过程中炭化温度和炭化时间对负载型规整催化剂活性的影响。结果表明，炭化物载体是一种无定型炭，有发达的复合孔隙结构。负载后的规整光催化剂有明显的光催化效果，气相中苯的初始质量浓度为300mg／m^3时，在规整光催化剂存在下，紫外光照100min后苯质量浓度下降到约20mg／m^3。此外，确定了载体适宜的炭化温度为550～600℃、炭化时间为2h。规整催化剂避免了粉体催化剂在处理气相系统中产生的粉尘污染，可望用于室内空气的治理。

A carbide support, which was prepared on metal meshes shaped in advance, was obtained by carbonizing phenolic resin, TiO2 was sintered on the support to form regular photocatalyst. The structures of support and catalyst were characterized by SEM and XRD techniques, and photocatalytic activity of the regular catalyst was also evaluated with benzene in gas-phase as the model reactant. Experimental results showed that the carbide support was amorphous carbon, which possessed abundant pore structures. The regular photocatalyst exhibited good activity. Under UV irradiation, the concentration of benzene decreased from 300 mg/m^3 to 20 mg/m^3 in 100 min. In addition, the appropriate conditions of preparing the support were determined：carbonization temperature 550 - 600 ℃ and carbonization time 2 h. Compared with powdered TiO2, this catalyst is more suitable for indoor air purification because of no dust pollution.