Preparation and photocatalytic performance of CdS QDs/Bi 2MoO 6 heterojunction photocatalyst

摘要：

采用水相合成技术制备出CdS量子点(QDs),并将其与Bi2MoO6复合制备出高活性的CdS QDs/Bi2MoO6异质结光催化剂.通过XRD、XPS、UV-Vis DRS、TEM、PL等手段对所得样品的晶体结构、形貌及光电性能进行表征.在300 W氙灯照射下,以Na2S和Na2SO3为牺牲剂,评价了不同条件下所得样品的光解水制氢性能.结果表明,Bi2MoO6的引入能显著提高CdS QDs的产氢效率.当Bi2MoO6的质量分数为7%时所得CdS QDs/Bi2MoO6复合光催化剂的性能最佳,6 h内的产氢效率为727μmol·h-1·g-1,比纯CdS QDs的产氢效率提升了3.36倍.CdS QDs和Bi2MoO6形成的异质结结构不仅提高了光吸收效率,还明显促进了光生电子和空穴的有效分离,进而提高了CdS QDs/Bi2MoO6异质结光催化剂的产氢性能.

CdS quantum dots(QDs)were prepared by aqueous phase route and then combined with Bi 2MoO 6 to construct the CdS QDs/Bi 2MoO 6 heterojunction photocatalyst with high photocatalytic activity.The structure,morphology and photoelectric properties of the as-prepared photocatalysts were characterized by X-ray diffractometry(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),UV-Visible diffuse reflectance spectroscopy(UV-Vis DRS)and fluorescence spectroscopy(PL).Under the irradiation of 300 W xenon lamp,the H 2 production performances of the products were evaluated using Na 2S and Na 2SO 3 as sacrificial agents.The results show that the introduction of Bi 2MoO 6 can significantly improve the H 2-production efficiency of CdS QDs.And the optimum H 2-production efficiency of about 727μmol·h-1·g-1 can be achieved over CdS QDs/Bi 2MoO 6 composite within 6 h irradiation when the loading content of Bi 2MoO 6 is 7%(mass ratio),more 3.36 times higher than pure CdS QDs.The heterostructure formed between CdS QDs and Bi 2MoO 6 not only promotes the light absorption efficiency,but also significantly improves the separation efficiency of photogenerated electrons and holes,thus improving the photocatalytic H 2-production activity of CdS QDs/Bi 2MoO 6 heterojunction.

作者：

丁志伟 张鹏 刘玉民

Ding Zhiwei;Zhang Peng;Liu Yumin(Henan Xinlianxin Chemical Industry Group Co.,Ltd.,Xinxiang 453731,China;School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China)

机构地区：

河南心连心化学工业集团股份有限公司 betway官方app 化学化工学院

出处：

《betway官方app 学报：自然科学版》 CAS 北大核心 2020年第4期58-65,共8页

基金国家自然科学基金(U1204503) 河南省重点科技攻关项目(172102210347) 河南省教育厅科学技术研究重点项目(18A150035).

关键词：

水相合成法 异质结 光催化 制氢

aqueous phase synthesis heterojunction photocatalysis hydrogen production

分类号：

X52 [环境科学与工程—环境工程]

CdS QDs_Bi2MoO6异质结光催化剂的制备及光催化性能研究.pdf