To synchronously achieve the rational use of biomass resources and the design of highly efficient Cu_(2) Obased photocatalysts,the Ag/CQDs/Cu_(2)O was synthesized by hydrothermal process,where the CQDs were derived fr...To synchronously achieve the rational use of biomass resources and the design of highly efficient Cu_(2) Obased photocatalysts,the Ag/CQDs/Cu_(2)O was synthesized by hydrothermal process,where the CQDs were derived from waste biomass.The TC-HCl degradation efficiency could reach 95.08%with a 0.2 g·L^(-1)dosage of Ag/CQDs/Cu_(2)O,much higher than that of pristine Cu_(2)O(48.60%)and Ag/Cu_(2)O(66.97%).Mechanism exploration revealed the key roles of Ag NPs and CQDs in complex photocatalysts where multiple synergistic pathways greatly enhanced the generation and separation of photocarriers.The convert-light via CQDs matched for Cu_(2)O could induce more photocarrier generation.Meanwhile,the Schottky barriers between Cu_(2)O and Ag NPs and the electron reservoir properties of CQDs accelerated the separation of electron-hole pairs.The effects of catalyst dosage,various concentrations of TC-HCl,coexisting anions and humic acid and pH value have been studied as well.Tapping experiments and electron spin resonance(ESR)identified that the·O_(2)-and·OH were the main active species during photodegradation process.Additionally,the underlying degradation process of TC-HCl in Ag/CQDs/Cu_(2)O photocatalytic system was revealed by theoretical calculation and HPLC-MS.This work will provide a new perspective for future material design and research on enhancing heterologous catalysis oxidation process.展开更多
基金financially supported by the Natural Science Foundation of Hunan Province(2023JJ40233)Scientific Research Project of Hunan Education Department(24B0555,24A0448)。
文摘To synchronously achieve the rational use of biomass resources and the design of highly efficient Cu_(2) Obased photocatalysts,the Ag/CQDs/Cu_(2)O was synthesized by hydrothermal process,where the CQDs were derived from waste biomass.The TC-HCl degradation efficiency could reach 95.08%with a 0.2 g·L^(-1)dosage of Ag/CQDs/Cu_(2)O,much higher than that of pristine Cu_(2)O(48.60%)and Ag/Cu_(2)O(66.97%).Mechanism exploration revealed the key roles of Ag NPs and CQDs in complex photocatalysts where multiple synergistic pathways greatly enhanced the generation and separation of photocarriers.The convert-light via CQDs matched for Cu_(2)O could induce more photocarrier generation.Meanwhile,the Schottky barriers between Cu_(2)O and Ag NPs and the electron reservoir properties of CQDs accelerated the separation of electron-hole pairs.The effects of catalyst dosage,various concentrations of TC-HCl,coexisting anions and humic acid and pH value have been studied as well.Tapping experiments and electron spin resonance(ESR)identified that the·O_(2)-and·OH were the main active species during photodegradation process.Additionally,the underlying degradation process of TC-HCl in Ag/CQDs/Cu_(2)O photocatalytic system was revealed by theoretical calculation and HPLC-MS.This work will provide a new perspective for future material design and research on enhancing heterologous catalysis oxidation process.
