Two types of nickel-modified Cd_1−xZn_xS-based photocatalysts, Cd_xZn_1−xNi_yS_y+1 (mol% Ni = 0.05–0.5; x = 0.8) and yNiS/Cd_xZn_1−xS (mol% Ni = 0.1–1.0; x = 0.8), were prepared via a simple two-stage technique. The samples were characterized by XRD, UV–vis spectroscopy, and XPS techniques. The activity of the synthesized photocatalysts were tested in the gas-phase photocatalytic reduction of CO₂ under visible light (λ = 450 nm). It has been shown that both Cd_xZn_1−xNi_yS_y+1 and yNiS/Cd_xZn_1−xS samples with ultra-low content of nickel sulfide have improved activity in the carbon dioxide reduction in comparison to bare Cd_xZn_1−xS solid solutions. Also, it has been demonstrated that the addition of the reducing agent—hydrogen—into the system does not lead to a positive effect: the rate of CO₂ reduction either remains unchanged or decreases.

两种镍改性的Cd _1-x Zn _x S基光催化剂，Cd _x Zn _1-x Ni _y S _{y + 1}（mol％Ni = 0.05-0.5; x = 0.8）和yNiS / Cd _x Zn _{1- x} S（Ni的摩尔％= 0.1–1.0； x = 0.8）是通过简单的两阶段技术制备的。样品通过X射线衍射，紫外可见光谱和XPS技术进行了表征。在可见光（λ＝ 450nm）下在气相光催化还原CO ₂中测试了合成的光催化剂的活性。已经表明，Cd _x Zn _1-x Ni _y S _{y + 1}和yNiS / Cd _x与裸露的Cd _x Zn _1-x S固溶体相比，硫化镍含量极低的Zn _1-x S样品在减少二氧化碳方面具有更高的活性。同样，已经证明，向系统中添加还原剂（氢）不会产生积极的效果：CO _2的还原速率保持不变或降低。