硫化物负载ZnO/ZnAl2O4复合空心球及其光催化还原CO2

摘要

ZnO/ZnAl2O4 nanocomposites were successfully synthetized by a facile one-pot hydrothermal process. CuS, CdS and Bi2S3 were loaded on the ZnO/ZnAl2O4by an impregnation process to investigate their photocatalytic activi-ties under simulated sunlight irradiation. The as-prepared samples were characterized by XRD, SEM, TEM, BET and FLtechniques. Meanwhile, photocatalytic reduction of CO2 from water over the samples was explored using NaOH and Na2SO3 as sacrificial reagents.The effects of the type and the amount of sulfideson photocatalytic reduction effi-ciency were investigated. The results indicated that Bi2S3-loading lowered down the photocatalytic activity of ZnO/ZnAl2O4, while CuS or CdS loading enhanced the photocatalytic activity. After ZnO/ZnAl2O4 loaded with 1wt% CuS, the maximum yield of 8.21 mmol/gcat methanol within 6 h was obtained, which increased by up to 3.2 times as compared to ZnO/ZnAl2O4under the same conditions. The photocatalytic mechanism of the as-prepared CuS/ZnO/ZnAl2O4were preliminarily discussed.%采用一步水热法制备了ZnO/ZnAl2O4纳米复合物,通过浸渍法负载CuS、CdS和Bi2S3对其进行修饰,并在模拟太阳光照射下研究负载样品的光催化活性。用XRD、SEM、TEM、BET和FL等技术对所得样品进行表征,以NaOH 和Na2SO3作为光催化还原二氧化碳过程的牺牲剂,考察了硫化物种类及其负载量对ZnO/ZnAl2O4光催化还原活性的影响。结果表明,负载CuS和CdS均可提高ZnO/ZnAl2O4光催化还原活性,而负载Bi2S3却有所降低。当CuS负载量为1wt%时,样品光催化还原活性最佳,反应6 h后所得还原产物甲醇的生成量为8.21 mmol/gcat,在相同条件下较原样提高了约3.2倍。对CuS/ZnO/ZnAl2O4的光催化机理进行了初步探讨。