Abstract:

In view of the problems of low value addition and functionalization of recycled waste cotton fabric, cotton cellulose grafted with acrylic acid was employed as a template and catalytic charring effect of ammonium dihydrogen phosphate was involved. Anatase TiO2/C composite catalyst in fiber form was prepared via a surface sol-gel method and flame burning with a precursor of tetrabutyl titanate and a solvent of anhydrous ethanol. The effects of acrylic acid photografting and ammonium hydrogen phosphate treatment on photocatalytic performance of TiO2/C photocatalyst were discussed. The morphology, crystalline structure and thermal loss were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TG). The results showed that the cotton cellulose based TiO2/C photocatalyst exhibited better photocatalytic performance, which was prepared by grafting with acrylic acid of 30wt%, soaking in NH4H2PO4 solution of 15wt% for 20min, depositing 10 times via filtration of tetrabutyl titanate and burning in air for 2h. Relatively small size and well-distributed anatase TiO2 was responsible for better photocatalytic performance.

Key words: waste cotton fabric, acrylic acid, cotton cellulose, photocatalyst, ammonium dihydrogen phosphate