中文摘要：

为提高空气净化效果,研究了聚苯胺（PANi）/TiO2-SiO2复合催化剂对甲醛的吸附和协同光催化作用.考察了TiO2-SiO2涂敷层数、PANi浓度和不同酸（有机酸、盐酸）掺杂对紫外光催化氧化甲醛的影响,以及PANi/TiO2-SiO2在可见光下去除甲醛的效果.结果表明,复合聚苯胺的存在使吸光范围拓展到可见光区,提高了对甲醛的吸附.涂敷3层TiO2-SiO2、吸附浓度0.26g/L的PANi溶液所得复合催化剂紫外光催化效果最好,与没有PANi的催化剂相比,使甲醛去除率提高2倍.有机酸掺杂比无机酸掺杂的PANi复合催化剂紫外光催化甲醛的初期反应快,但最终甲醛的去除率相同.PANi/TiO2-SiO2具有显著的可见光催化氧化去除甲醛的活性,对低浓度甲醛氧化去除速率更快.

英文摘要：

To improve the photocatalytic efficiency in removing formaldehyde from indoor air,coated composite PANi（polyaniline） /TiO2-SiO2 on stainless steel was studied for its formaldehyde adsorption capacity and synergetic photocatalytic effect. Composite PANi/TiO2-SiO2was formed by adsorption of organic acid or hydrochloric acid doped PANi in solution,and characterized by FTIR and UV-Vis spectra,the later showed extended absorbency well into the visible wavelength range;Cyclic voltammetry curves proved that PANi was stable and the adsorption of formaldehyde on PAni resulted in the occurrence of formaldehyde related electrochemical peak. The effect of catalyst coating times,concentrations of PANi solution during adsorption and PANi doping acid（organic acid,hydrochloric acid） on photocatalytic degradation of formaldehyde were investigated under UV irradiation. Loading three layers TiO2-SiO2 and immersing in 0.26g/L HCl doped PANi/THF solution produced the best photocatalyst with the highest activity under UV,which was 3 times the formaldehyde removal rate of a TiO2-SiO2 film without PANi. The PANi/TiO2-SiO2 doped with organic acid had faster initial formaldehyde oxidation rate than that doped with inorganic acid,but the final removal rate was same. The photocatalytic oxidation activity of formaldehyde under visible light was proved for PANi/TiO2-SiO2 in removing formaldehyde from air,though lower than the activity under UV. Formaldehyde removal rate was faster at lower concentration.