Co²⁺掺杂Zn_0.5Cd_0.5S固溶体的制备及其光催化CO₂还原性能研究

Synthesis and Photocatalytic CO₂ Reduction Performance of Co²⁺ Doped Zn_0.5Cd_0.5S Solid Solution

摘要: 通过水热法制备了Zn_0.5Cd_0.5S固溶体和掺杂Co²⁺分别为0.5%、1%和2% (摩尔百分比)的Zn_0.5Cd_0.5S/Co掺杂型光催化剂。采用了X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外–可见光分光光度计(UV-vis)和光致发光(PL)对材料进行了表征，并测试了可见光下光催化CO₂还原活性。结果表明：Co²⁺掺杂后的催化剂结构与形貌没有发生显著变化，但是能带结构发生了明显调整；其中Zn_0.5Cd_0.5S/Co-1%催化剂在K₂SO₃/KHCO₃液相体系，可见光辐射(λ > 420 nm)下CO₂还原活性明显优于初始Zn_0.5Cd_0.5S材料。为高效光催化剂的构建提供了一种简易的方法。

Abstract: Zn_0.5Cd_0.5S solid solution and Co²⁺ doped Zn_0.5Cd_0.5S photocatalysts were successfully synthesized by hydrothermal method. The concentrations of Co²⁺ are 0.5 mol%, 1 mol% and 2 mol%, respectively. X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet-visible spectrophotometer (UV-vis) and photoluminescence (PL) were used to characterize, and the photocatalytic CO₂ reduction performance was measured under visible light. The results showed that the structure and morphology of Zn_0.5Cd_0.5S/Co did not change significantly, but the energy band structure was remarkably adjusted. Under the K₂SO₃/KHCO₃ liquid system and visible light radiation (λ > 420 nm), the Zn_0.5Cd_0.5S/Co-1 sample presented better CO₂ reduction performance than the pristine Zn_0.5Cd_0.5S. It provides a simple method for the construction of high-efficiency photocatalytic systems.