壁纸固载石墨烯/TiO_2降解甲醛及动力学研究

Formaldehyde degradation and kinetics based on the graphene/TiO_2 coated wallpapers

以溶剂热法制备的石墨烯/TiO_2复合光催化剂,采用涂布法将石墨烯/TiO_2固载于无纺布壁纸表面,研究石墨烯/TiO_2的固载量、甲醛初始质量浓度及空气相对湿度对甲醛降解的影响,并对其光催化降解动力学进行探讨.结果表明:在光照4 h的条件下,当石墨烯/TiO_2固载量为2 g·m-2、甲醛初始质量浓度为0.40 mg·m^(-3)、空气相对湿度为58%时,甲醛降解率可达86%;石墨烯/TiO_2对甲醛的降解效果优于商品化TiO_2(P25);石墨烯/TiO_2对甲醛的光催化降解过程服从一级反应动力学方程.

The composite photocatalyst graphene/TiO2 was prepared by the solvothermal reaction,and coated on the surface of wallpapers. The photocatalytic activity of the loaded graphene/TiO2 was studied in the conditions of different,coating quantity,initial concentration of formaldehyde and relative humidity. And the photocatalytic degradation kinetics was discussed in this paper. The results showed that the formaldehyde degradation rate can reach 86% after 4 h＇s photocatalytic reaction when the graphene/TiO2 coating quantity was 2 g·m^-2,initial mass concentration of formaldehyde was 0.4 mg·m^-3 and relative humidity was 58%. The photocatalytic performance of graphene/TiO2 was superior to ordinary commercial TiO2（ P25）. The reactions of photocatalytic oxidation of formaldehyde followed firstorder kinetic.