Activated Chestnut Tannin-Based Cotton Fabrics Modified and Assembled in Multiple Layers for Efficient Formaldehyde Removal

This study aims to investigate the adsorption performance of chestnut tannin (CT)-modified cotton fabrics for HCHO and to analyze the characteristics associated with HCHO adsorption. In experiment, CT served as the adsorption carrier, while 1,4-butanediol diglycidyl ether (BDDE) was utilized for chemical modification to graft CT onto the cellulose molecular chain. Subsequently, a multilayer assembly of the cotton fabric was prepared by alternately applying CT solution and poly-(diallyl dimethylammonium chloride) (PDMDAAC) solution. The characteristics and chemical structure of the fabric were analyzed. By employing a method of assembly followed by modification, CT can be effectively linked to cotton fabric molecules, resulting in samples with an average pore size of 21.3 nm, and an increase in specific surface area of 43.07%. The modified and assembled fabric achieved a HCHO removal rate exceeding 84% within 2 h, with the samples that were first assembled and then modified reaching a maximum HCHO removal rate of 90.89%. Consequently, sample was subjected to excitation under conditions of pH 12, resulting in a HCHO removal rate of up to 93.22%. The findings of this research can be utilized to develop cost-effective textiles for HCHO removal, with promising applications in specific environments and related fields.