Boreskov Institute of Catalysis, Novosibirsk 630090, Russia.
Photochem Photobiol Sci. 2019 Apr 10;18(4):871-877. doi: 10.1039/c8pp00332g.
Novel photocatalysts for CO2 reduction, which consist of a cadmium and zinc sulfide solid solution (Cd1-xZnxS), were successfully prepared by a simple two-step technique. The photocatalysts were characterized by X-ray diffraction, UV-VIS diffuse reflectance spectroscopy, and low-temperature N2 adsorption techniques and were tested in the gas-phase photocatalytic reduction of CO2 under visible light (λ = 450 nm). All the synthesized Cd1-xZnxS solid solutions were capable of enabling the chemical transformations of CO2 under the conditions considered. Carbon monoxide was the major product during the CO2 reduction over Cd1-xZnxS (x = 0-0.87). Methane and hydrogen were also detected in the gas phase in low amounts. The activity of the prepared samples and the distribution of the reduction products strongly depended on the actual cadmium to zinc ratio. The Cd0.94Zn0.06S photocatalyst showed the highest activity, 2.9 μmol CO per gram per hour, and selectivity, 95%, during CO2 reduction under visible light in the presence of water vapor. The achieved values are very high for the sulfide-based photocatalysts.
新型光催化剂，由硫化镉和硫化锌的固溶体（Cd1-xZnxS）组成，通过简单的两步法成功制备。采用 X 射线衍射、紫外可见漫反射光谱和低温氮气吸附技术对光催化剂进行了表征，并在可见光（λ=450nm）下进行了气相 CO2光催化还原测试。所有合成的 Cd1-xZnxS 固溶体在考虑的条件下都能够实现 CO2的化学转化。在 Cd1-xZnxS（x=0-0.87）上进行 CO2还原时，主要产物是一氧化碳。在气相中也以少量检测到甲烷和氢气。所制备样品的活性和还原产物的分布强烈依赖于实际的镉锌比。在水蒸气存在下进行可见光下的 CO2还原时，Cd0.94Zn0.06S 光催化剂表现出最高的活性，每克每小时 2.9 μmol CO，选择性为 95%。对于基于硫化物的光催化剂来说，所达到的值非常高。
