2,3-己二酮-双缩(4-甲基氨基硫脲)席夫碱镍配合物与硫化铟锌复合材料的合成及其光催化析氢性能研究

A novel 2,3-hexazinone-diacetyl(4-methylthiosemicarbazone) Ni complex co-catalyst to support ZnIn2S4 NPs for enhanced photocatalytic hydrogen evolution

中文关键词:  缩氨基硫脲席夫碱  分子催化剂  光催化分解水析氢  硫化物半导体

英文关键词:Thiosemicarbazone Schiff base  molecular cocatalyst  photocatalytic decomposition of water to produce hydrogen  sulfide semiconductor

中文摘要:

      2,3-己二酮-双缩(4-甲基氨基硫脲)席夫碱配体与Ni金属盐通过水热法成功制备出一种单核镍配合物. 配合物与ZnIn2S4复合, 构成一个高效光催化分解水体系C1/ZIS(配合物C1/ZIS). 在最佳反应条件下, 可见光照射4 h内的C1/ZIS平均析氢速率为345 μmol?h-1, 是纯ZnIn2S4的2.2倍, 工作可达28 h以上, TON可达4068. 在单色光(λ = 420 nm)照射6 h内, 平均AQY为~8.7 %. 分子配合物催化剂的加入提高了体系的光催化析氢活性和析氢持久性.

英文摘要:

      A novel nickel complex was prepared by hydrothermal method with 2,3-hexazinone-diacetyl(4-methylthiosemicarbazone) Schiff base ligand with Ni metal salt. In this experiment, ZnIn2S4 was used as a photosensitizer, complex as a molecular cocatalyst, and ascorbic acid as the sacrificial electron donor to form an efficient photocatalytic water decomposition system. Under the optimal reaction conditions, the average hydrogen evolution rate within 4 h of visible light irradiation is 345 μmol?h-1, 2.2 times that of pure ZnIn2S4, in which TON is 4068 for more than 28 h. Moreover, the photocatalytic activity of the C1/ZIS(complex C1/ZIS) system did not decrease significantly with the increase in reaction time, which may be because ZnIn2S4 has good photo-corrosion resistance and is not easy to be inactivated during the photocatalytic process. Under monochromatic light irradiation (λ = 420 nm) for 8 h, the average AQY is ~8.7 %. The addition of molecular cocatalyst significantly improved the system's photocatalytic activity and hydrogen evolution persistence.