Comparison study on dye degradation by PDA-SF/AgNPs-H₂O₂ and PDA-SF/AgNPs-PMS catalytic system

Aijing Li , Xinpeng Chen , Ping Yao , Jun Zhang , Tieling Xing *, Guoqiang Chen 

College of Textile and Clothing Engineering, Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production (ERC), Soochow University, Suzhou 215123, China. Suzhou Institute of Trade and Commerce, Suzhou 215009, China.

In this work, polydopamine (PDA) was used to facilitate the reduction of silver nitrate (AgNO₃) to silver nanoparticles (AgNPs) and the simultaneous loading on waste silk fabrics (PDASF/AgNPs). The removal activity of the obtained composite PDA-SF/AgNPs on different dyes in the presence of hydrogen peroxide (H₂O₂) and potassium peroxymonosulfate (PMS) was compared. The effects of reaction temperature, H₂O₂/PMS dosage, dye concentration, composite dosage, electrolyte concentration and time in two catalyst systems on the dye removal were discussed. The results showed the dye removal of Telon Red A₂R reached 81% and 95% in 30–50 min in PDASF/AgNPs-H₂O₂ and PDA-SF/AgNPs-PMS system, respectively. Quenching experiments demonstrated that OH, O₂^– and SO₄^-  were produced during the degradation process, and the possible degradation pathway of Telon Red A₂R were analyzed by HPLC-MS. In addition, the kinetic study indicated that the removal of dye followed quasi-second-order adsorption kinetics. These findings suggest that fabric-based composites have great potential and applications in catalysis and treatment of wastewater.

Arabian Journal of Chemistry (2023) 16, 105167