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ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究

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陆一达, 刘国光, 王枫亮, 邹雪刚, 马京帅, 张钱新, 陈平. ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究[J]. 环境化学, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
引用本文: 陆一达, 刘国光, 王枫亮, 邹雪刚, 马京帅, 张钱新, 陈平. ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究[J]. 环境化学, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
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LU Yida, LIU Guoguang, WANG Fengliang, ZOU Xuegang, MA Jingshuai, ZHANG Qianxin, CHEN Ping. Synthesis of ZnFe2O4/TiO2 composites and its photocatalytic degradation of Indomethacin under simulated sunlight[J]. Environmental Chemistry, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
Citation: LU Yida, LIU Guoguang, WANG Fengliang, ZOU Xuegang, MA Jingshuai, ZHANG Qianxin, CHEN Ping. Synthesis of ZnFe2O4/TiO2 composites and its photocatalytic degradation of Indomethacin under simulated sunlight[J]. Environmental Chemistry, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
shu

ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究

  • 1.

    广东工业大学环境科学与工程学院, 广州, 510006

  • 基金项目:

    国家自然科学基金（21377031，21677040）资助.

Synthesis of ZnFe2O4/TiO2 composites and its photocatalytic degradation of Indomethacin under simulated sunlight

  • 1.

    School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China

  • Fund Project: Supported by the National Natural Science Foundation of China(21377031, 21677040).

  • 摘要: 本文制备了ZnFe2O4/TiO2光催化剂，利用紫外可见吸收光谱（UV-Vis）、电子透射显微镜（TEM）和X射线衍射（XRD）对ZnFe2O4/TiO2的形貌、结构和光谱特征进行表征.同时，研究了不同条件下复合材料对吲哚美辛（IDM）的光催化降解规律.结果表明，二氧化钛与铁酸锌能够很好地粘附在一起，使得吸收波长发生了红移，扩大了吸收光谱的范围.当ZnFe2O4和TiO2的质量比为3%时，在模拟太阳光的条件下该光催化剂对IDM的降解效果最好，降解率达到95%.此外，IDM的光催化降解反应符合准一级动力学规律，在pH=5、催化剂投加量为0.2 g·L-1时，光催化剂的降解速率常数是纯TiO2时的2.15倍.随着光催化剂投加量的增大，IDM的降解速率随之增加.pH=5时最有利于光催化剂对IDM的降解.经过5次循环实验后，催化剂对IDM的光催化降解率仍在92%以上，展现了该光催化剂的稳定性.猝灭实验揭示了光生空穴（h+）和超氧自由基在ZnFe2O4/TiO2光催化体系中对IDM的降解贡献率最大，其中光生空穴（h+）的贡献率为78.2%.
    Abstract: In this study, stable ZnFe2O4/TiO2 catalysts were successfully prepared by coupling TiO2 with ZnFe2O4. The morphology, structure and optical properities of the ZnFe2O4/TiO2 composites were characterized by UV-Vis absorption spectoscopy (UV-Vis), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The doping contents of 3wt% ZnFe2O4 resulted in 2.15 fold higher photo catalytic degradation rate of indomothacin (IDM) rate than of pristine TiO2 due to the heterojunction. The photocatalytic degradation of IDM was highest under the condition of pH 5, T=25°. The photodegradation of IDM followed pseudo-first-order kinetics and IDM was removed 95% under 15 mins under simulated sunlight exposure. With the increase of the photocatalyst concentration, the photocatalytic efficiency was correspondingly strengthened. The catalysts retained a stable photodegradation efficiency of >90% for at least 5 cycles. The quenching experiment revealed that the contribution rate of photogenerated holes (h+), which is the main active species in photocatalytic degradation of IDM, was 78.2%.
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  • 收稿日期:  2017-07-26
  • 刊出日期:  2017-12-15
陆一达, 刘国光, 王枫亮, 邹雪刚, 马京帅, 张钱新, 陈平. ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究[J]. 环境化学, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
引用本文: 陆一达, 刘国光, 王枫亮, 邹雪刚, 马京帅, 张钱新, 陈平. ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究[J]. 环境化学, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
shu
LU Yida, LIU Guoguang, WANG Fengliang, ZOU Xuegang, MA Jingshuai, ZHANG Qianxin, CHEN Ping. Synthesis of ZnFe2O4/TiO2 composites and its photocatalytic degradation of Indomethacin under simulated sunlight[J]. Environmental Chemistry, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
Citation: LU Yida, LIU Guoguang, WANG Fengliang, ZOU Xuegang, MA Jingshuai, ZHANG Qianxin, CHEN Ping. Synthesis of ZnFe2O4/TiO2 composites and its photocatalytic degradation of Indomethacin under simulated sunlight[J]. Environmental Chemistry, 2017, 36(12): 2550-2557. doi: 10.7524/j.issn.0254-6108.2017072602
shu

ZnFe2O4/TiO2复合材料的制备及其在模拟太阳光下光催化降解吲哚美辛的动力学和机理研究

  • 1. 广东工业大学环境科学与工程学院, 广州, 510006
  • 收稿日期:  2017-07-26
基金项目:

国家自然科学基金（21377031，21677040）资助.

摘要: 本文制备了ZnFe2O4/TiO2光催化剂，利用紫外可见吸收光谱（UV-Vis）、电子透射显微镜（TEM）和X射线衍射（XRD）对ZnFe2O4/TiO2的形貌、结构和光谱特征进行表征.同时，研究了不同条件下复合材料对吲哚美辛（IDM）的光催化降解规律.结果表明，二氧化钛与铁酸锌能够很好地粘附在一起，使得吸收波长发生了红移，扩大了吸收光谱的范围.当ZnFe2O4和TiO2的质量比为3%时，在模拟太阳光的条件下该光催化剂对IDM的降解效果最好，降解率达到95%.此外，IDM的光催化降解反应符合准一级动力学规律，在pH=5、催化剂投加量为0.2 g·L-1时，光催化剂的降解速率常数是纯TiO2时的2.15倍.随着光催化剂投加量的增大，IDM的降解速率随之增加.pH=5时最有利于光催化剂对IDM的降解.经过5次循环实验后，催化剂对IDM的光催化降解率仍在92%以上，展现了该光催化剂的稳定性.猝灭实验揭示了光生空穴（h+）和超氧自由基在ZnFe2O4/TiO2光催化体系中对IDM的降解贡献率最大，其中光生空穴（h+）的贡献率为78.2%.

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