李灵,黄应平,张爱清,向淼淼,杨健,贾漫珂.BiVO4/ Bi6O6(OH)3(NO3)3复合光催化剂的制备及光催化性能研究[J].分子催化,2016,30(5):470-479
BiVO4/ Bi6O6(OH)3(NO3)3复合光催化剂的制备及光催化性能研究
Synthesis and Visible-Light Photocatalysis Performance Research of BiVO4/Bi6O6(OH)3(NO3)3 Composite Photocatalyst
投稿时间:2016-07-04  修订日期:2016-09-12
DOI:
中文关键词:  水热合成法 钒酸铋 碱式硝酸铋 光催化
英文关键词:hydrothermal method  bismuth vanadate  bismuth basic nitrate  visible photocatalytic degradation
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)、湖北省创新群体项目、国家水专项子课题、催化材料科学湖北省暨国家民委教育部共建重点实验室开放基金
作者单位E-mail
李灵 三峡大学生物与制药学院 chem_ctgu@126.com 
黄应平 三峡库区生态环境教育部工程研究中心(三峡大学) chem_ctgu@126.com 
张爱清 中南民族大学化学与材料科学学院 aiqingzhang_2000@sina.com 
向淼淼 三峡大学生物与制药学院 chem_ctgu@126.com 
杨健 三峡大学生物与制药学院 chem_ctgu@126.com 
贾漫珂* 三峡大学生物与制药学院 jiamanke@yeah.net 
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中文摘要:
      以Bi(NO3)3•5H2O和NH4VO3为原料,控制水溶液介质pH及反应时间,采用水热合成法制备钒酸铋(BiVO4)及其复合物(BiVO4/ Bi6O6(OH)3(NO3)3)。利用X-射线粉末衍射、扫描电子显微镜和紫外-可见漫反射吸收光谱等手段对制备的样品进行了物理表征, 结果表明,在控制反应时间为1 h,介质pH值在1.14~9.01之间时,制备的样品为BiVO4/ Bi6O6(OH)3(NO3)3复合物,当pH值增加至10.92时为纯BiVO4;控制介质pH为7.17,反应时间在1~12小时之间时得到BiVO4/ Bi6O6(OH)3(NO3)3复合光催化剂,反应时间为18h时为纯BiVO4。在可见光(λ≥400nm)照射下,以有机染料罗丹明B(Rhodamine B,RhB)为底物, 研究不同条件制备的BiVO4或者复合物为光催化剂的光催化特性,发现pH =7.17,水热反应12 h得到的催化剂(BiVO4/ Bi6O6(OH)3(NO3)3)光催化降解活性高于对照制备的纯BiVO4。同时在可见光照射下,BiVO4/Bi6O6(OH)3(NO3)3亦可以有效降解无色小分子2,4-二氯苯酚(2,4-Dichlorophenol, 2,4-DCP),说明氧化过程涉及到光催化过程。分析BiVO4/ Bi6O6(OH)3(NO3)3复合光催化剂对RhB光催化降解过程中活性物种, 表明在降解过程中主要涉及空穴和超氧氧化,O2•-起主要作用。
英文摘要:
      BiVO4 and BiVO4 /Bi6O6(OH)3(NO3)3 photocatalysts with different morphologies were synthesized hydrothermally by altering pH of the solution and reaction time. The samples molecular structure and morphologies were characterized by XRD, UV-Vis DRS and SEM. Firstly, a series of solutions were prepared from pH 1.17 to 9.01 and heated by controlling the reaction time at 1h. Pure BiVO4 was achieved at pH 10.92. Similarly, the reaction time was altered from 1-18h by controlling the solution pH at 7.17 and pure BiVO4 was achieved when the solution was heated for 18h. Results reveal that the preparation conditions affect the morphology, composition and photocatalytic efficiency with BiVO4 /Bi6O6(OH)3(NO3)3 prepared by heating the solution for 12 h at pH 7.17 display an enhanced efficiency than BiVO4 . The as-prepared samples show high photocatalytic activity for the degradation of RhB and 2,4-DCP during visible light irradiation. Appropriate radical and hole scavengers(h ) reveal superoxide radicals(O2.-) and photogenerated holes are produced in the reaction system. Superoxide radical is the dominant active species for the photocatalytic degradation of RhB.
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