Degradation of residual formaldehyde in fabric by photo-catalysis

Abstract

The residual formaldehyde (HCHO) in fabric was degraded using photo-catalysis assisted by the compound catalyst of nano-TiO₂ and nano-ZnO. The effects of several factors on the degradation, such as the composing of catalyst, irradiation time, pH value and the H₂CHO concentration of the immersed solution were investigated. Results showed that H₂CHO of the immersed solution had degraded 93% after 5 h irradiation, and the degradation ratio of formaldehyde could be improved and the aging of the fabric can be avoided with the addition of ZnO nanoparticles and pH value of the immersed-fibric solution. The fabric with residual formaldehyde about 1 800 γ/g can be efficiently treated to satisfy the China National Standard (GB/2912.1-1998) with the photo-catalytic degradation.

Keywords

photo-catalytic degradation / fabric / formaldehyde

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