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.
作者
翟永清
杨帅
任淑霞
孙庆琳
厉志鹏
胡正磊
丁士文
殷艳杰
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)
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
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)