Metal–organic complex-derived 3D porous carbon-supported g-C3N4/TiO2 as photocatalysts for the efficient degradation of antibiotic. Issue 26 (21st June 2021) - Wang, Yanru
Abstract : g-C3 N4 /TiO2 /CNOT heterojunction photocatalysts exhibit efficient synergistic adsorption–photocatalysis performance for the removal of chlortetracycline hydrochloride (CTC-HCl). Abstract : Metal–organic complexes (MOCs) derived porous carbon have attracted considerable attention due to easy functionalization with metal/metal oxides or other heteroatoms and hierarchical porosity. Herein, four g-C3 N4 /TiO2 /CNOT photocatalyst structures were prepared via a reasonable design and control of the amount of MOC crystal materials. g-C3 N4 /TiO2 /CNOT photocatalysts have a 3D porous structure, high surface area and heterojunction interface between g-C3 N4 and TiO2, which together enhance the adsorption and photocatalytic performance. The 3D porous structure of g-C3 N4 /TiO2 /CNOT supplied multidimensional adsorption-enrichment sites, and the heterojunction promoted the separation of the photogenerated electrons and holes. The g-C3 N4 /TiO2 /CNOT-15 photocatalyst with the highest surface area reached up to 1644.1 m 2 g −1 . Heterojunctions promoted the separation and migration of the photogenerated electrons and holes. Benefiting from the above-mentioned excellent characteristics, g-C3 N4 /TiO2 /CNOT exhibits efficient synergistic adsorption–photocatalysis performance for the removal of chlortetracycline hydrochloride (CTC-HCl). Apparently, g-C3 N4 /TiO2 /CNOT-15 shows the highest CTC-HCl photocatalytic efficiency up to 97.8% after 60 min in the static system. In the dynamic system, the maximum CTC-HCl removal rate reached 35.5% and equilibrium removal rate was 19.9%. Free radical trapping experiments demonstrated that ˙O2 − radical, ˙OH radical and holes serving as active species work together to promote photocatalytic reactions. This study provides a clear direction for the preparation of a 3D porous heterojunction for the efficient removal of antibiotics via synergy adsorption and photocatalysis.