TiO2-Cu7S4 modified with a carbazole-based conjugated porous polymer for adsorption and photocatalytic degradation of bisphenol A

Adsorption-photocatalytic degradation of organic pollutants in water is an advantageous method for environmental purification. Herein, a feasible strategy is developed to construct a novel dual S-scheme heterojunctions Cu7S4-TiO2-conjugated polymer with a donor-acceptor structure. There are abundant adsorption active sites for adsorption in the porous structure of the composites, which can rapidly capture pollutants through hydrogen bonding and π-π interactions. In addition, the dual S-scheme heterojunctions effectively improve carrier separation while maintaining a strong redox ability. Thus, the optimized 1.5% CST-130 catalysts can adsorb 71% of 20 ppm BPA in 15 min and completely remove it within 30 min with high adsorption capacity and photodegradation efficiency. Therefore, this study provides a new inspiration for synergistic adsorption and degradation of BPA and the construction of dual S-scheme heterojunction.