光催化剂SnC_2O_4的合成及其可见光催化活性  

Synthesis of Photocatalyst SnC_2O_4 and Its Visible Photocatalytic Activity

作　　者：翟永清[1] 杨帅[1] 任淑霞[1] 孙庆琳 厉志鹏 胡正磊[1] 丁士文[1] 殷艳杰[1] ZHAI Yong-qing;YANG Shuai;REN Shu-xia;SUN Qing-lin;LI Zhi-peng;HU Zheng-lei;DING Shi-wen;YIN Yan-jie(College of Chemistry and Environmental Science,HeBei University,Baoding 071002,China)

机构地区：[1]河北大学化学与环境科学学院,保定071002

出　　处：《人工晶体学报》2018年第10期2009-2014,2021,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51302061);河北大学研究生创新项目(hbu2018ss24);河北大学实验室开放项目基金(sy201656)

摘　　要：以(NH_4)_2C_2O_4为沉淀剂,采用直接沉淀法合成了新型光催化剂SnC_2O_4粉末。通过X射线粉末衍射、扫描电镜、紫外-可见分光光度计及荧光分光光度计等手段对样品的物相结构、微观形貌以及光吸收性能等进行了分析表征。结果表明:所制备的样品为单斜白钨矿型SnC_2O_4,空间群为C2/C(15)。样品的微观形貌为不规则多面体,其禁带宽度为3. 44 e V。光致发光光谱表明样品内部可能有大量的氧空位和其它缺陷。以甲基橙为模拟染料废水对SnC_2O_4样品的光催化活性进行了评价。当甲基橙染料的浓度为40 mg/L,SnC_2O_4光催化剂的投加量为40 mg/50m L时,在模拟可见光照射下,甲基橙降解率可达99. 1%,且光催化降解反应符合一级动力学方程。此外,通过引入活性物种捕获剂证明·O-2在光催化降解甲基橙反应中起重要作用。A novel type of photocatalyst SnC 2O 4 powder was synthesized by direct precipitation method with(NH 4)2C 2O 4 as precipitant.The phase structure,microstructure and optical absorption properties of the sample were characterized by X-ray powder diffraction,scanning electron microscope,UV-Vis spectrophotometer and fluorescence spectrophotometer.The results show that the prepared sample is monoclinic SnC 2O 4 with space group C2/C(15).The micromorphology of the sample exhibits irregular polyhedron.The average band gap is estimated to be 3.44 eV.The photoluminescence spectrum suggests that SnC 2O 4 sample might have a large number of oxygen vacancies and some other defects.The photocatalytic activity of SnC 2O 4 was evaluated with methyl orange as a simulated dye wastewater.When the concentration of methyl orange is 40 mg/L and the dosage of SnC 2O 4 photocatalyst is 40 mg/50 mL,the degradation rate of methyl orange can reach to 99.1%under simulated visible light irradiation,and the photocatalytic degradation reaction accords with the first-order kinetic equation.In addition,·O-2 has been proved to play an important role in the photocatalytic degradation of methyl orange by the introduction of active species capture agent.

关 键 词：SnC2O4 光催化 可见光 甲基橙 

分 类 号：TQ174.75[化学工程—陶瓷工业]