SnO_2负载TiO_2纳米管的制备与光催化活性
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摘要
结合阳极氧化法和脉冲沉积法合成SnO_2/TiO_2纳米管光催化剂,实现了SnO_2纳米颗粒在TiO_2纳米管表面的均匀负载。利用场发射扫描电子显微镜(FE-SEM)、能谱仪(EDS)、X射线衍射仪(XRD)以及紫外-可见漫反射光谱(UV-Vis DRS)对样品进行表征,以甲基橙为模拟污染物,评价了纳米管的光催化活性。结果表明,SnO_2/TiO_2纳米管经750℃煅烧后主晶相为锐钛矿相TiO_2,含少量金红石相TiO_2和SnO_2,三者两两之间形成三元异质结,促进光生电子-空穴对的分离,此时SnO_2/TiO_2纳米管表现出最佳的光催化活性,紫外光下对甲基橙1 h分解比例由32.4%提升至96.5%。
SnO_2/TiO_2 nanotubes composite photocatalysts were synthesized by combining anodic oxidation and pulsed electrodeposition method. Homogeneous SnO_2 nanoparticles deposited on the surface of TiO_2 nanotubes were obtained. The nanotubes were characterized by field emission scanning electron microscopy( FE-SEM),energy dispersive spectroscopy( EDS),X-ray diffraction( XRD) and UV-visible diffuse reflection spectrum( UV-Vis). The photocatalytic activities of the nanotubes were evaluated according to their photodegradation behavior on methyl orange. The main crystal phase of the SnO_2/TiO_2 nanotubes after 750 ℃ calcination is anatase phase,containing a small amount of rutile phase and SnO_2.Ternary heterojunctions of SnO_2/TiO_2 nanotube photocatalysts including anatase TiO_2/rutile TiO_2,anatase TiO_2/SnO_2,and rutile TiO_2/SnO_2 were successfully created. They were able to separate photogenerated electron-hole pairs efficiently,and have the best photocatalytic activity accordingly. Thereby,the 1 h photocatalytic degradation rate of methyl orange increased from 32. 4% of pure TiO_2 nanotubes to 96. 5%of SnO_2/TiO_2 nanotubes under ultraviolet light.
SnO_2/TiO_2 nanotubes composite photocatalysts were synthesized by combining anodic oxidation and pulsed electrodeposition method. Homogeneous SnO_2 nanoparticles deposited on the surface of TiO_2 nanotubes were obtained. The nanotubes were characterized by field emission scanning electron microscopy( FE-SEM),energy dispersive spectroscopy( EDS),X-ray diffraction( XRD) and UV-visible diffuse reflection spectrum( UV-Vis). The photocatalytic activities of the nanotubes were evaluated according to their photodegradation behavior on methyl orange. The main crystal phase of the SnO_2/TiO_2 nanotubes after 750 ℃ calcination is anatase phase,containing a small amount of rutile phase and SnO_2.Ternary heterojunctions of SnO_2/TiO_2 nanotube photocatalysts including anatase TiO_2/rutile TiO_2,anatase TiO_2/SnO_2,and rutile TiO_2/SnO_2 were successfully created. They were able to separate photogenerated electron-hole pairs efficiently,and have the best photocatalytic activity accordingly. Thereby,the 1 h photocatalytic degradation rate of methyl orange increased from 32. 4% of pure TiO_2 nanotubes to 96. 5%of SnO_2/TiO_2 nanotubes under ultraviolet light.
引文
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[3]Wang Z M,Liu B,Xie Z X,et al.Preparation and photocatalytic properties of Ru O2/Ti O2composite nanotube arrays[J].Ceram.Int.,2016,42:13664-13669.
[4]Lim S P,Pandikumar A,Huang N M,et al.Promotional effect of silver nanoparticles on the performance of N-doped Ti O2photoanode-based dyesensitized solar cells[J].RSC Adv.,2014,4(89):48326-48244.
[5]Yao Q,wang C,Wang H,et al.Revisiting the Au particle size effect on Ti O2-coated Au/Ti O2catalysts in CO oxidaton reaction[J].J.Phys.Chem.C,2016,120(17):9174-9183.
[6]Liu L,Dao T D,Kodiyath R,et al.Plasmonic januscomposite photocatalyst comprising Au and C-Ti O2for enhanced aerobic oxidation over a broad visible-light range[J].Adv.Funct.Mater.,2014,24:7754-7762.
[7]Chu H,Lei W,Liu X,et al.Synergetic effect of Ti O2as co-catalyst for enhanced visible light photocatalytic reduction of Cr(VI)on Mo Se2[J].Appl.Catal.A:Gen.,2016,521:19-25.
[8]Xiang Q,Yu J,Jaroniec M.Synergetic effect of Mo S2and graphene as cocatalysts for enhanced photocatalytic H2production activity of Ti O2nanoparticles[J].J.Am.Chemical Soc.,2012,134(15):6575-6578.
[9]赵伟荣,施巧梦,刘莹.Sn O2/Ti O2纳米管复合光催化剂的性能及失活再生[J].物理化学学报,2014,30(7):1318-1324.
[10]Chang S Y,Chen S.F,Huang Y C.Synthesis,structural correlations,and photocatalytic properties of Ti O2nanotube/Sn O2-Pd nanoparticle heterostructures[J].J.Phys.Chem.C,2011,115(5),1600-1607.
[11]Zhou X F,Cao J L,Xu M F,et al.Enhancement of visible light activity in Ag modified Sn O2/Ti O2[J].Mater.Res.Bull.,2013,48(11):4942-4946.
[12]滕繁,刘涌,王伟,等.掺氟二氧化锡/二氧化钛复合薄膜的光催化和低辐射性能[J].硅酸盐学报,2012,40(2):283-288.
[13]Li L,Yang Y,Huang X,et al.Pulsed electrodeposition of single-crystalline Bi2Te3nanowire arrays[J].Nanotechnology,2006,17(17):1706-1712.
[14]Jankulovska M,Berger T,Lana-Villarreal T,et al.A comparison of quantum-sized anatase and rutile nanowire thin films:devising differences in the electronic structure from photoelectrochemical measurements[J].Electrochim.Acta,2012,62(15),172-180.
[15]Xing M,Zhang J,Chen F,et al.An economic method to prepare vacuum activated photocatalysts with high photo-activities and photosensitivities[J].Chem.Commun.,2011,47(17):4947-4949.
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