BiPO_4/g-C_3N_4二元催化剂的制备及其可见光催化性能研究
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摘要
本研究通过一步搅拌法制备了BiPO_4/g-C_3N_4二元催化剂,以活性蓝19(RB19)为目标污染物,研究了其在可见光下的催化降解性能。采用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(DRS)和傅里叶红外光谱(FT-IR)等表征了催化剂的物化性质。结果表明:BiPO_4成功附着到g-C_3N_4上,并且分散效果较好,BiPO_4的掺入使g-C_3N_4的带隙变窄,提高了g-C_3N_4的可见光利用率,延长了光生电子-空穴对的寿命。最后通过分析推测出可能的光催化降解机理。
In this study,BiPO_4/g-C_3N_4 binary catalyst was prepared by one-step stirring method.The catalytic degradation performance under visible light was studied with reactive blue 19(RB19)as the target pollutant.The physicochemical properties of the catalysts were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),ultraviolet-visible diffuse reflectance spectroscopy(DRS)and Fourier transform infrared spectroscopy(FT-IR).The results showed that BiPO_4 was successfully attached to g-C_3N_4 and the dispersion effect was good.The incorporation of BiPO_4 narrowed the band gap of g-C_3N_4,improved the visible light utilization of g-C_3N_4,and prolonged the life expectancy of the photogenerated electron-hole pairs.Finally,the possible photocatalytic degradation mechanism was inferred by analysis.
In this study,BiPO_4/g-C_3N_4 binary catalyst was prepared by one-step stirring method.The catalytic degradation performance under visible light was studied with reactive blue 19(RB19)as the target pollutant.The physicochemical properties of the catalysts were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),ultraviolet-visible diffuse reflectance spectroscopy(DRS)and Fourier transform infrared spectroscopy(FT-IR).The results showed that BiPO_4 was successfully attached to g-C_3N_4 and the dispersion effect was good.The incorporation of BiPO_4 narrowed the band gap of g-C_3N_4,improved the visible light utilization of g-C_3N_4,and prolonged the life expectancy of the photogenerated electron-hole pairs.Finally,the possible photocatalytic degradation mechanism was inferred by analysis.
引文
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[4]Guo S,Yang Z,Wen Z,et al.Reutilization of iron sludge as heterogeneous Fenton catalyst for the degradation of rhodamine B:Role of sulfur and mesoporous structure[J].J Colloid Interface Sci,2018,532:441-448.
[5]Fujishima A,Honda K.Electrochemical photolysis of water at a semiconductor electrode[J].Nature,1972,238(5358):37-38.
[6]Chen Y,Huang W,He D,et al.Construction of heterostructured g-C3N4/Ag/TiO2 microspheres with enhanced photocatalysis performance under visible-light irradiation[J].ACS Appl Mater Inter,2014,6(16):14405.
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[8]Wang Y,He Y,Lai Q,et al.Review of the progress in preparing nano TiO2:An important environmental engineering material[J].环境科学学报(英文版),2014,26(11):2139-2177.
[9]Wang P,Huang B,Qin X,et al.Ag@AgCl:a highly efficient and stable photocatalyst active under visible light[J].Angew Chem Int Ed Engl,2008,47(41):7931-7933.
[10]Ran R J,Ma T Y,Gao G,et al.Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H2 production[J].Energ Environ Sci,2015,8(12):3708-3717.
[11]Guo S,Deng Z,Li M,et al.Phosphorus-doped carbon nitride tubes with a layered micro-nanostructure for enhanced visible-light photocatalytic hydrogen evolution[J].Angew Chem Int Ed,2016,55(5):1830-1834.
[12]Wang H,Xu Y,Jing L,et al.Novel magnetic BaFe12O19/g-C3N4 composites with enhanced thermocatalytic and photo-Fenton activity under visible-light[J].J Alloys Compd,2017,710.
[13]Chen X,Kuo D H,Hou Y X.Enhancing the photodegradation of charged pollutants under visible light in Ag2O/g-C3N4 catalyst by coulombic interaction[J].J Mater Sci,2017,52(9):5147-5154.
[14]Gu Y,Yu Y,Zou J,et al.The ultra-rapid synthesis of rGO/g-C3N4 composite via microwave heating with enhanced photocatalytic performance[J].Mater Lett,2018,232:107-109.
[15]Zhong J,Li J,Liu X,et al.Enhanced photo-induced charge separation and solar-driven photocatalytic activity of g-C3N4 decorated by SO42-[J].Mater Sci Semicond Process,2015,40:508-515.
[16]Zou X,Dong Y,Chen Z,et al.Synthesis and characterization of BiPO4/g-C3N4 nanocomposites with significantly enhanced visible-light photocatalytic activity for benzene degradation[J].RSC Adv,2016,6(25):20664-20670.
[17]Pan C,Xu J,Wang Y,et al.Dramatic activity of C3N4/BiPO4 photocatalyst with core/shell structure formed by self‐assembly[J].Adv Funct Mater,2012,22(7):1518-1524.
[18]Yan S C,Li Z S,Zou Z G.Photodegradation of rhodamine B and methyl orange over boron-doped g-C3N4 under visible light irradiation[J].Langmuir,2010,26(6):3894-3901.
[19]Ye L,Liu J,Jiang Z,et al.Facets coupling of BiOBr-g-C3N4 composite photocatalyst for enhanced visible-light-driven photocatalytic activity[J].Appl Catal B,2013,142(10):1-7.
[20]Pan C,Xu J,Chen Y,et al.Influence of OH-related defects on the performances of BiPO4 photocatalyst for the degradation of rhodamine B[J].Appl Catal B,2012,115-116(5):314-319.
[21]Zou X,Ran C,Dong Y,et al.Synthesis and characterization of BiPO4/g-C3N4 nanocomposites with significantly enhanced visible-light photocatalytic activity for benzene degradation[J].RSC Adv,2016,6(25):20664-20670.
[22]Li Z,Li B,Peng S,et al.Novel visible light-induced g-C3N4 quantum dot/BiPO4 nanocrystal composite photocatalysts for efficient degradation of methyl orange[J].RSC Adv,2014,4(66):35144-35148.
[23]Dai K,Lu L,Liang C,et al.A high efficient graphitic-C3N4/BiOI/graphene oxide ternary nanocomposite heterostructured photocatalyst with graphene oxide as electron transport buffer material[J].Dalton Trans,2015,44(17):7903-7910.
[24]Ding K,Yu D,Wang W,et al.Fabrication of multiple hierarchical heterojunction Ag@AgBr/BiPO4/r-GO with enhanced visible-light-driven photocatalytic activities towards dye degradation[J].Appl Surf Sci,2018,445:39-49.
[25]Zou X,Dong Y,Li X,et al.Inorganic–organic photocatalyst BiPO4/g-C3N4 for efficient removal of gaseous toluene under visible light irradiation[J].Catal Commun,2015,69:109-113.
[26]Xiang Q,Yu J,Jaroniec M.Enhanced photocatalytic H2-production activity of graphene-modified titania nanosheets[J].Nanoscale,2011,3(9):3670-3678.
[27]Zhang Y,Wu J,Deng Y,et al.Synthesis and visible-light photocatalytic property of Ag/GO/g-C3N4 ternary composite[J].Mater Sci Eng,B,2017,221:1-9.
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