NrGO wrapped Cu-ZrO2 as a multifunctional visible-light-sensitive catalyst for advanced oxidation of pollutants and CO2 reduction.

Construction of tailor made photocatalyst is the need to achieve high visible light assimilation and charge carrier separation. In this path, combination of catalytic active element (Cu), defect rich metal oxide (ZrO2) and photoactive (NrGO) is an effective strategy. Herein, NrGO wrapped Cu-ZrO2 was prepared by modified Hummersthermal annealing-hydrothermal approach. The synergism between Cu, Zr and NrGO was studied using transient photocurrent, EIS and TEM images. Consequently, O3/NrGO@Cu-ZrO2-10/Vis synergistic system has achieved superior photocatalytic ozonation-catalytic ozonation than individual photocatalysis and ozonation. Further, the advanced oxidation process was optimized and the catalyst was efficiently used for the reduction of CO2 into useful products. Tolerance of O3/NrGO@Cu-ZrO2-10/Vis system against rhodamine B, hydroquinone, bisphenol A and p-cresol has been investigated. A plausible mechanism was proposed based on ESR studies, BODIPY fluoresence method, band gap and Mott-Schottky data. This research provides an idea of multifunctional catalyst for advanced oxidation of contaminants and CO2 reduction.

Automated summary

This study constructed a highly efficient photocatalyst by combining Cu, Zr, and NrGO. The synergistic effect among these elements was investigated, showing that the O3/NrGO@Cu-ZrO2-10/Vis system had superior performance in photocatalytic ozonation compared to individual photocatalysis and ozonation. The catalyst also showed good stability and effectiveness in the reduction of CO2 into useful products. A possible mechanism was proposed based on experimental data. This research provides insights into the development of multifunctional catalysts for advanced oxidation and CO2 reduction.