Abstract：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.
柳丽芬, 赵世博, 杨凤林. 聚苯胺/TiO2-SiO2复合催化剂去除空气中甲醛的研究[J]. 中国环境科学, 2009, 29(4): 362-367.
LIU Li-Fen, ZHAO Shi-Bo, YANG Feng-Lin. Study on photocatalytic removal of formaldehyde from air using PANi/TiO2-SiO2 composite catalyst.. CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(4): 362-367.
