Cu-O-incorporation design for promoted heterogeneous catalysis: synergistic effect of surface adsorption and catalysis towards efficient bisphenol A removal

摘要

Construction of active adsorption and catalytic sites is an effective approach to promote adsorption and heterogeneous catalysis. However, developing high efficient catalyst and exploring the systematic mechanism are still long-term objectives for practical application. Herein, a unique strategy of Cu-O-incorporation into g-C3N4 framework (Cu-O-CN) was proposed, the obtained catalyst was employed as efficient PMS activator for the affluent active sites and ascendant redox behaviors. The mechanistic study showed the introduced oxygen was in the form of C-O groups, acted as the center of the active sites, to adsorb pollutants for subsequent catalysis. After PMS addition, the redox cycle of Cu2+/Cu+ was triggered by electron transfer via fabricated C-O-Cu linkage, resulting in the generation of SO4 center dot- and 1O2 for direct pollutants degradation. Consequently, the screened Cu-OCN-100/PMS reaction system was capable enough towards bisphenol A (BPA) elimination, and the ratios of adsorption and catalysis accounted for 32.6% and 67.0%, respectively, through BPA removal ratio calculation. Moreover, this reaction system exhibited widely applicable pH range and potential ability towards actual water purification. This study can provide a valuable insight for efficient synergistic effect of adsorption and catalysis by Cu-O-incorporated design, and is of great significance to broaden the practical application for water treatment.