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Date of Publication:2022-10-06

Journal:中国环境科学

Affiliation of Author(s):海洋科学与技术学院

Issue:4

Page Number:362-367

ISSN No.:1000-6923

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 HC1 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.

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