磁性可见光催化剂Ce-BiVO_4/Fe_3O_4的制备及性能研究
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摘要
以Bi(NO_3)_3·5H_2O、NH_4VO_3和Ce(NO_3)_3·6H_2O为原料,Fe_3O_4为磁基质,通过水热-超声辅助原位法合成了CeBiVO_4/Fe_3O_4复合光催化剂,利用XRD、UV-Vis-DRS、FT-IR等对催化剂进行了结构表征;以亚甲基蓝(MB)为目标降解物,利用单因素变量法考察了催化剂反应条件对光催化性能的影响。结果表明,催化剂中BiVO_4以单斜晶相和四方晶相混合存在,稀土Ce的掺杂拓宽了BiVO4的光谱响应范围并增强了其可见光吸收能力,在Ce-BiVO_4/Fe_3O_4催化剂的质量浓度为1. 5 g/L、反应体系pH=7和可见光下反应90 min的条件下,对25 mg/L的MB降解率达97. 3%。该催化剂重复使用3次后,对MB的降解率仍可达80%以上;该催化剂对其他3种染料也表现出良好的降解能力。
A novel Ce-BiVO4/Fe_3O_4 composite photocatalyst is synthesized by hydrothermal-ultrasonic-assisted in situ method with Bi( NO_3)_3·5 H_2O,NH_4VO_3 and Ce( NO_3)_3·6 H_2 O as raw materials,and Fe_3O_4 as magnetic matrix.The catalyst is characterized by XRD,UV-Vis-DRS and FTIR techniques.Taking methylene blue( MB) as the target pollutant for degradation,the effect of reaction conditions on photocatalytic performance of the catalyst is investigated through single factor variable method.The experimental results show that Bi VO_4 in the composite catalyst exists as a mixture with monoclinic phase and tetragonal phase.The doping of rare earth Ce broadens the spectral response range of Bi VO_4 and enhances its visible light absorption capability.The degradation rate of 25 mg·L-1 MB can reach 97. 3% under 90 min of visible light irradiation when the dosage of Ce-BiVO_4/Fe_3O_4 catalyst is 1. 5 g·L-1 and p H value of the solution is 7.The degradation rate of MB can still exceed 80% over the catalyst that has been used for three times.This catalyst also shows good degradation ability to the other three kinds of dyes.
A novel Ce-BiVO4/Fe_3O_4 composite photocatalyst is synthesized by hydrothermal-ultrasonic-assisted in situ method with Bi( NO_3)_3·5 H_2O,NH_4VO_3 and Ce( NO_3)_3·6 H_2 O as raw materials,and Fe_3O_4 as magnetic matrix.The catalyst is characterized by XRD,UV-Vis-DRS and FTIR techniques.Taking methylene blue( MB) as the target pollutant for degradation,the effect of reaction conditions on photocatalytic performance of the catalyst is investigated through single factor variable method.The experimental results show that Bi VO_4 in the composite catalyst exists as a mixture with monoclinic phase and tetragonal phase.The doping of rare earth Ce broadens the spectral response range of Bi VO_4 and enhances its visible light absorption capability.The degradation rate of 25 mg·L-1 MB can reach 97. 3% under 90 min of visible light irradiation when the dosage of Ce-BiVO_4/Fe_3O_4 catalyst is 1. 5 g·L-1 and p H value of the solution is 7.The degradation rate of MB can still exceed 80% over the catalyst that has been used for three times.This catalyst also shows good degradation ability to the other three kinds of dyes.
引文
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[4]Zhu P,Chen,Y,Duan M,et al.Influence of calcination temperature on the photocatalytic property of Fe-Cu-ZnO/graphene under visible light irradiation[J]. Russian Journal of Applied Chemistry,2016,89(12):2027-2034.
[5]Jian Z,Huang S,Cao Y,et al.Hydrothermal preparation and characterization of Ti O2/BiVO4composite catalyst and its photolysis of water to produce hydrogen[J]. Photochemistry and Photobiology,2016,92(3):363-370.
[6]Ji T H,Yang F,Zhou J Y,et al.Visible-light responding BiVO4/Ti O2nanocomposite photocatalyst[J].Spectroscopy and Spectral Analysis,2010,30(7):1944-1947.
[7]王嘉楠,倪刚,李玲玲,等.BiVO4/BiOCl复合材料的制备及其光催化性能的研究[J].现代化工,2014,34(9):59-63.
[8]晏威,王姣,朱毅,等.磁性可见光催化剂BiVO4/Fe3O4的制备及催化活性[J].无机化学学报,2011,27(02):287-292.
[9]Zhou D,Pang L X,Guo J,et al.Influence of Ce subsitution for Bi in BiVO4and the impact on the phase evolution and microwave dielectric properties[J]. Inorganic Chemistry,2014,53(2):1048-1055.
[10]Shinde A,Guevarra D,Liu G,et al. Discovery of Fe-Ce Oxide/BiVO4photoanodes through combinatorial exploration of Ni-Fe-CoCe Oxide coatings[J].ACS Applied Materials&Interfaces,2016,8(36):23696-23705.
[11]Chin T S,Yang W C.Deposition and magnetic properties of Fe3O4/Fe/Fe3O4tri-layer films[J]. Journal of Materials Science&Technology,2000,(2):191-194.
[12]Zhai Y,Yin Y,Liu X,et al.Novel magnetically separable BiVO4/Fe3O4photocatalyst:Synthesis and photocatalytic performance under visible-light irradiation[J]. Materials Research Bulletin,2017,89:297-306.
[13]Zhang J,Wang B,Li C.Synthesis of novel Ge O2-BiVO4/FAG composites with enhanced visible-light photocatalytic properties[J].Journal of Environmental Sciences,2014,26:1936-1942.
[14]Kim Y K,Oliveria M.Magnetic properties and texture of sputtered Fe/Fe3O4multilayer films[J]. IEEE Transactions on Magnetics,1994,30(3):1316-1323.
[15]Lee J,Ye H,Pan S,et al.Screening of photocatalysts by scanning electrochemical microscopy[J]. Analytical Chemistry,2008,80(19):7445-7450.
[16]姜承志,苏会东,卢旭东.混晶纳米Ti O2薄膜光催化降解亚甲基蓝[J].环境科学与技术,2008,31(3):26-30.
[17]Ma J,Huang D,Zhang W,et al. Nanocomposite of exfoliated bentonite g-C3N4/Ag3PO4for enhanced visible-light photocatalytic decomposition of Rhoda mine B[J].Chemosphere,2016,162(06):269-276.