Zn0.4(CuGa)0.3Ga2S4/CdS光催化材料的制备及其CO2还原性能

利用光催化技术将CO2转化为燃料有望解决能源危机和温室效应.Zn1–2x(CuGa)xGa2S4具有可见光响应及较高的导带电势,从热力学角度上看是较为理想的CO2还原材料,但是其光催化CO2还原活性仍然较低,亟待从动力学角度提高其活性.本研究采用Zn0.4(CuGa)0.3Ga2S4与不同比例的CdS纳米颗粒复合,制备...

Synthesis of Zn0.4(CuGa)0.3Ga2S4/CdS Photocatalyst for CO2 Reduction

Conversion of CO₂ into fuels by photocatalysis is promising in solving the energy crisis and the greenhouse effect.Among various photocatalytic materials,Zn_1-2x(CuGa)_xGa₂S₄ materials possess visible light response and high conduction band potential,which are ideal CO₂ reduction materials from thermodynamics aspect.However,their photocatalytic CO₂ reduction activity is still low which is urgent to improve its activity in terms of kinetics.In this study,Zn_0.4(CuGa)_0.3Ga₂S₄ was synthesized and composited with CdS nanoparticles with different proportions to form Zn_0.4(CuGa)_0.3Ga₂S₄/CdS heterojunction photocatalysts.A series of characterizations suggest that CdS is uniformly grown on surface of Zn_0.4(CuGa)_0.3Ga₂S₄ microcrystals to form Z-scheme type all-solid heterojunction composite materials.Such a structure effectively suppresses the recombination of electron-hole pairs and improves the photocatalytic performance.In the solution CO₂ reduction system,the as-prepared Zn_0.4(CuGa)_0.3Ga₂S₄/CdS can effectively reduce CO₂ into CO under visible light irradiation.The optimal molar ratio of Zn_0.4(CuGa)_0.3Ga₂S₄ and CdS in composite materials is 2:1,whose photocatalytic performance is 1.7 times of that of Zn_0.4(CuGa)_0.3Ga₂S₄/CdS and 1.6 times of that of CdS.This work constructs all solid Z-scheme type Zn_0.4(CuGa)_0.3Ga₂S₄/CdS heterojunction materials with enhanced photocatalytic activity for CO₂ reduction,which is promising for designing novel photocatalysts in the field of artificial photosynthesis.