Formaldehyde(HCHO)causes increasing concerns due to its ubiquitously found in indoor air and being irritative and carcinogenic to humans.Photothermal-catalysis developed in recent years has been considered as a signif...Formaldehyde(HCHO)causes increasing concerns due to its ubiquitously found in indoor air and being irritative and carcinogenic to humans.Photothermal-catalysis developed in recent years has been considered as a significant strategy for enhancing catalytic activity.Manganese oxides,compared with its strong thermocatalytic activity,generally suffer from much lower photocatalytic activity make its photochemical properties less concerned.Herein,α-MnO_(2)nanowires were composited with the graphene oxide(GO)via mechanical grinding and co-precipitating method,respectively.α-MnO_(2)/GO nanohybrids prepared by co-precipitating method exhibits excellent activity,achieving 100%decomposition of HCHO with the solar-light irradiation at ambient temperature.It is found that,besides the photo-driven thermocatalysis,the photocatalysis mechanism made a major contribution to the decomposition of HCHO.The incorporation of GO,on the one hand,is beneficial to improve the optical absorption capacity and photothermal conversion efficiency;on the other hand,is conductive to electron transfer and effective separation of electrons and holes.These synergistic effects significantly improve the catalytic activity ofα-MnO_(2)/GO nanohybrids.This work proposes a new approach for the utilization of solar energy by combining manganese oxides,and also develops an efficient photothermal-catalyst to control HCHO pollution in indoor air.展开更多
基金financially supported by National Natural Science Foundation of China(No.21906084)the National Undergraduate Training Program for Innovation and Entrepreneurship(No.202010288026Z)。
文摘Formaldehyde(HCHO)causes increasing concerns due to its ubiquitously found in indoor air and being irritative and carcinogenic to humans.Photothermal-catalysis developed in recent years has been considered as a significant strategy for enhancing catalytic activity.Manganese oxides,compared with its strong thermocatalytic activity,generally suffer from much lower photocatalytic activity make its photochemical properties less concerned.Herein,α-MnO_(2)nanowires were composited with the graphene oxide(GO)via mechanical grinding and co-precipitating method,respectively.α-MnO_(2)/GO nanohybrids prepared by co-precipitating method exhibits excellent activity,achieving 100%decomposition of HCHO with the solar-light irradiation at ambient temperature.It is found that,besides the photo-driven thermocatalysis,the photocatalysis mechanism made a major contribution to the decomposition of HCHO.The incorporation of GO,on the one hand,is beneficial to improve the optical absorption capacity and photothermal conversion efficiency;on the other hand,is conductive to electron transfer and effective separation of electrons and holes.These synergistic effects significantly improve the catalytic activity ofα-MnO_(2)/GO nanohybrids.This work proposes a new approach for the utilization of solar energy by combining manganese oxides,and also develops an efficient photothermal-catalyst to control HCHO pollution in indoor air.
