在线阅读 --自然科学版 2020年5期《EDTA对BiOI结构及光催化性能的影响》
EDTA对BiOI结构及光催化性能的影响--[在线阅读]
张艳峰1, 苗泽瑞1, 崔红2
1. 河北师范大学 化学与材料科学学院, 河北 石家庄 050024;
2. 河北交通职业技术学院 教务处, 河北 石家庄 050035
起止页码: 429--433页
DOI: 10.13763/j.cnki.jhebnu.nse.2020.05.010
摘要
以Bi(NO33·5H2O为Bi源、KI为碘源、乙二胺四乙酸二钠为添加剂,利用化学沉淀法制备出花状BiOI.通过X射线衍射、扫描电子显微镜、紫外-可见漫反射光谱等手段对样品进行表征,测试添加乙二胺四乙酸(EDTA)制备的BiOI对罗丹明B的光催化降解活性.结果表明,添加EDTA的BiOI吸收边发生蓝移,带隙能由1.74eV增加到1.80eV,提高了催化剂对可见光的吸收能力.利用300W的氙灯作为光源,添加量为8%(质量分数)时, 40min罗丹明B的降解率为95.6%.捕获剂实验证明,·O2-和h+是罗丹明B降解的主要活性物种.
关键字: BiOI EDTA 光催化活性

Effect of EDTA on the Structure and Photocatalytic Performance of BiOI
ZHANG Yanfeng1, MIAO Zerui1, CUI Hong2
1. College of Chemistry and Material Science, Hebei Normal University, Hebei Shijiazhuang 050024, China;
2. Dean's Office, Hebei Jiaotong Vocation and Technical College, Hebei Shijiazhuang 050035, China
Abstract:
Flower-like BiOI was prepared by chemical precipitation method using Bi(NO3)3·5H2O as Bi source,KI as iodine source,and ethylenediamine tetraacetic acid disodium sodium(EDTA-2Na) as additives.The samples were characterized by X-ray diffraction,scanning electron microscopy,and ultraviolet-visible diffuse reflectance spectroscopy,respectively.The photocatalytic degradation activity for rhodamine B over BiOI prepared with EDTA was measured.The results showed that the absorption edge of BiOI with EDTA was blue-shifted,and the band gap energy was increased from 1.74eV to 1.80eV,which improved the absorption ability of visible light of catalyst.The degradation rate of rhodamine B within 40min was 95.6% using a 300W xenon lamp as the light source when the dosage of additive was 8%.Capture agent experiments have proven that ·O2- and h+ were the main active species for degradation of rhodamine B.

收稿日期: 2020-01-20
基金项目: 国家自然科学基金(11179029);河北省教育厅重点项目(ZD2018019);河北师范大学技术创新基金(L2017K05)

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