磁性BiPO_4-Fe_2O_3异质结催化剂的制备及其光催化特性研究
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摘要
通过醇热法制备出BiPO_4-Fe_2O_3异质结催化剂,利用XRD,SEM等手段对其进行物理结构的表征,发现Fe_2O_3均匀分散块状BiPO_4表面形成良好的异质结结构.以罗丹明B(Rhodamine B,RhB)为分子探针,在紫外光(λ=253.7nm)照射下考查BiPO_4-Fe_2O_3的光催化性能,发现其催化活性要高于纯BiPO_4,反应80min后可将(2.50×10-5 mol/L)RhB褪色,动力学速率常数k(0.049min-1)是单纯BiPO_4的2倍.通过对活性物种的测定发现,其反应过程主要涉及有·OH和H_2O_2生成,说明其催化降解机理主要为·OH对RhB的氧化作用.在进行5次循环实验后发现催化剂仍对RhB具有良好的降解活性,且利用其具有的磁性,在回收利用方面具有优势.为BiPO_4光催化的实际应用提供了理论依据.
BiPO_4-Fe_2O_3 was prepared by alcohol calorimetry.The physical properties of catalyst were characterized by XRD and scanning electron microscope(SEM).It is found that BiPO_4 and Fe_2O_3 could be well composite.Rhodamine B(RhB)was used as a molecular probe and the photocatalytic activity of BiPO_4-Fe_2O_3 was tested under ultraviolet light irradiation(λ=253.7 nm).The results show that the degradation capacity of BiPO_4-Fe_2O_3 catalyst is higher than that of pure BiPO_4.The RhB(2.50×10-5 mol/L)is degraded to colorless within 80 min;and the reaction kinetics(k=0.049 min-1)is twice than that of pure BiPO_4.The determination of active species presented the formation of ·OH and H_2O_2,indicating the photocatalytic mechanism mainly involving·OH oxidation process.The catalytic activity of BiPO_4-Fe_2O_3 maintaining good after 5 re-cycles,indicating its excellent stability.The BiPO_4-Fe_2O_3 composites are of good magnetism,which was able to activate H_2O_2,exhibiting the potential application in reutilization.
BiPO_4-Fe_2O_3 was prepared by alcohol calorimetry.The physical properties of catalyst were characterized by XRD and scanning electron microscope(SEM).It is found that BiPO_4 and Fe_2O_3 could be well composite.Rhodamine B(RhB)was used as a molecular probe and the photocatalytic activity of BiPO_4-Fe_2O_3 was tested under ultraviolet light irradiation(λ=253.7 nm).The results show that the degradation capacity of BiPO_4-Fe_2O_3 catalyst is higher than that of pure BiPO_4.The RhB(2.50×10-5 mol/L)is degraded to colorless within 80 min;and the reaction kinetics(k=0.049 min-1)is twice than that of pure BiPO_4.The determination of active species presented the formation of ·OH and H_2O_2,indicating the photocatalytic mechanism mainly involving·OH oxidation process.The catalytic activity of BiPO_4-Fe_2O_3 maintaining good after 5 re-cycles,indicating its excellent stability.The BiPO_4-Fe_2O_3 composites are of good magnetism,which was able to activate H_2O_2,exhibiting the potential application in reutilization.
引文
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[3]全玉莲,康春莉.提高BiPO4光催化性能的研究进展[J].硅酸盐通报,2015,34(11):3222-3227.
[4]Zhu Y,Wang Y,Ling Q,et al.Enhancement of Fullspectrum Photocatalytic Activity over BiPO4/Bi2WO6,Composites[J].Applied Catalysis B Environmental,2017,200:222-229.
[5]Lv H,Liu Y,Tang H,et al.Synergetic Effect of MoS2and Graphene as Cocatalysts for Enhanced Photocatalytic Activity of BiPO4 Nanoparticles[J].Applied Surface Science,2017,425.
[6]Tan G,She L,Liu T,et al.Ultrasonic Chemical Synthesis of Hybrid mpg-C3N4/BiPO4,Heterostructured Photocatalysts with Improved Visible Light Photocatalytic Activity[J].Applied Catalysis B Environmental,2017,207:120-133.
[7]Qin D D,Tao C L,In S,et al.Facile Solvothermal Method for Fabricating Arrays of Vertically Orientedα-Fe2O3 Nanowires and Their Application in Photoelectrochemical Water Oxidation[J].Energy&Fuels,2011,25(11):799-809.
[8]Chang F,Wu F,Zheng J,et al.In-situ Establishment of Binary Compositesα-Fe2O3/Bi12 O17Cl2 with Both Photocatalytic and Photo-Fenton Features[J].Chemosphere,2018,210:257-266.
[9]Wang Z,Fan Y,Wu R,et al.Novel Magnetic g-C3N4/α-Fe2O3/Fe3O4Composite for the Very Effective Visible-light-Fenton Degradation of Orange II[J].Rsc Advances,2018,8(10):5180-5188.
[10]Mahajan J,Pethaiyan J.Synthesis of TiO2@α-Fe2O3Core-shell Heteronanostructures by Thermal Decomposition Approach and Their Application Towards Sunlight Driven Photodegradation of Rhodamine B[J].New Journal of Chemistry,2018,42:2616-2626.
[11]Nogueira R F P,Oliveira M C,Paterlini W C.Simple and Fast Spectrophotometric Determination of H2O2in photo-Fenton Reactions Using Metavanadate[J].Talanta,2005,66(1):86-91.
[12]李灵,黄应平,张爱清,等.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.
[13]Yan Y,Ni T,Du J,et al.Green Synthesis of Balsam Pear-shaped BiVO4/BiPO4 Nanocomposite for Degradation of Organic Dye and Antibiotic Metronidazole[J].Dalton Transactions,2018,47(17):6089-6095.
[14]Bu Q,Li S,Wu Q,et al.Ferrihydrite Modified TiFe2O3as an Effective Photoanode:The Role of Interface Interactions in Enhancing the Photocatalytic Activity of Water Oxidation[J].Chemsuschem,2018,11(19):3486-3494.
[15]Feng J,Zhang D,Zhou H,et al.Coupling P Nanostructures with P-Doped g-C3N4 As Efficient Visible Light Photocatalysts for H2 Evolution and RhB Degradation[J].Acs Sustainable Chemistry&Engineering,2018,6(5):6342-6349.
[16]Nie Y,Hu C,Qu J,et al.Photoassisted Degradation of Azodyes Over FeOxH2x-3/Fe0in the Presence of H2O2at Neutral pH Values[J].Environmental Science&Technology,2007,41(13):4715-4722.
[17]Zheng K,Zhang J,Wang Y,et al.Photo-Fenton Degradation of Organic Dyes Based on a Fe3O4 Nanospheres/Biomass Composite Loaded Column.[J].J Nanosci Nanotechnol,2018,18(6):4288-4295.