铁掺杂TiO_2粉末的制备及其光催化性能
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摘要
用水热法制备了铁掺杂TiO_2粉末,以FT-IR、XRD和SEM对其表征,考察了铁掺杂TiO_2粉末对茜素红溶液的光催化性能。结果表明:1637 cm~(-1)和3420～3450 cm~(-1)处分别是吸附水中—OH弯曲振动和伸缩振动峰,说明试样中含有大量—OH,有好的光催化性能;产物为锐钛型TiO_2,在其三种晶型中光催化性能最好;产物为三维花状晶体,花状结构的直径2～3μm,由细小的纳米晶定向聚集而成。铁掺杂有助于提高TiO_2光催化性能,当掺铁量为5%(摩尔分数)时其光催化性能最好,与纯TiO_2相比茜素红的光催化降解效率提高了40. 2%。在最佳条件下:茜素红初始浓度1. 5 g/L、pH值为4、A-TiO_2的掺铁量5%(摩尔分数)和投入量0. 502 g/L、室温14℃、紫外光(λ=254 nm)照射45 min,茜素红降解率88. 07%。
Iron-doped TiO_2 powders were prepared by hydrothermal method and characterized by FT-IR,XRD and SEM. The photocatalytic activity of iron-doped TiO_2 powders was investigated by degrading alizarin red solution. The results showthat the peaks at 1637 cm~(-1)and 3420 cm~(-1)-3450 cm~(-1) are attributed to the bending vibration and stretching vibration of —OH from the adsorbed water,indicating that the sample contains a large amount of —OH and should have a good photocatalytic performance; The product is anatase-phase TiO_2 with the best photocatalytic performance in its three crystal types; The product displays three-dimensional flowerlike structure with a diameter of 2 μm~(-3) μm formed by the oriented assembly of tiny nanocrystals. The doping of iron can improve the photocatalytic activity of TiO_2. When the iron-doping content is 5% (molar fraction), the resulting product has the best photocatalytic performance,and when compared with pure TiO_2,its photocatalytic efficiency for degrading alizarin red is improved by 40. 2%. The degradation rate of alizarin red is 88. 07% under the following optimal conditions: initial alizarin red concentration of 1. 5g/L,pH value of 4,iron-doping content of 5% (molar fraction),feeding A-TiO_2 amount of 0. 502 g/L,room temperature of 14℃,irradiation of 254 nm-ultraviolet light for 45 min.
Iron-doped TiO_2 powders were prepared by hydrothermal method and characterized by FT-IR,XRD and SEM. The photocatalytic activity of iron-doped TiO_2 powders was investigated by degrading alizarin red solution. The results showthat the peaks at 1637 cm~(-1)and 3420 cm~(-1)-3450 cm~(-1) are attributed to the bending vibration and stretching vibration of —OH from the adsorbed water,indicating that the sample contains a large amount of —OH and should have a good photocatalytic performance; The product is anatase-phase TiO_2 with the best photocatalytic performance in its three crystal types; The product displays three-dimensional flowerlike structure with a diameter of 2 μm~(-3) μm formed by the oriented assembly of tiny nanocrystals. The doping of iron can improve the photocatalytic activity of TiO_2. When the iron-doping content is 5% (molar fraction), the resulting product has the best photocatalytic performance,and when compared with pure TiO_2,its photocatalytic efficiency for degrading alizarin red is improved by 40. 2%. The degradation rate of alizarin red is 88. 07% under the following optimal conditions: initial alizarin red concentration of 1. 5g/L,pH value of 4,iron-doping content of 5% (molar fraction),feeding A-TiO_2 amount of 0. 502 g/L,room temperature of 14℃,irradiation of 254 nm-ultraviolet light for 45 min.
引文
[1]Fujishima A,Honda K.Electrochemical photolysis of w ater at a semiconductor electrode[J].Nature,1972,238(7):37-38.
[2]彭淑静,唐立丹,王冰.Fe掺杂Ti O2纳米线阵列的制备及光催化性能研究[J].电子元件与材料,2016,35(8):41-45.
[3]付文,王丽,黄军左.Ag/Ti O2光催化降解茜素红[J].工业催化,2012,20(1):72-75.
[4]金冲,张卫国,姚素薇,等.热处理工艺对Ti O2纳米管阵列结构及其光电性能的影响[J].无机材料学报,2012,21(1):54-58.
[5]付文,李美书,王丽.Ti O2/Fe2O3光催化降解茜素红溶液[J].应用化工,2016,45(3):466-469.
[6]赵占中,谢银德,张冰,等.掺杂改性Ti O2可见光光催化剂研究的最新进展[J].硅酸盐通报,2012,31(1):92-95.
[7]Choi W,Termin A,Hoffmann M R.The role of metal ion dopants in quantum-sized Ti O2:correlation between photoreactivity and charge carried recombination dynamics[J].Journal of Physical Chemistry,1994,98(51):13669-13679.
[8]吴迎秋,袁强,李辉.Co/Ti O2催化剂对茜素红的降解探究[J].环保科技,2010,16(2):1-4.
[9]Hidaka H,Zhao J C,Pelizzetti E,et al.Photodegradation of surfactants VIII.Comparison of photocatalytic process betw een anionic sodium dodecylbenzenesulfonate and catonic benzyldodecyldimethylammonium chloride on the Ti O2surface[J].Journal of Physical Chemistry,1992,96(5):2226-2230.
[10]刘光明,张天永,吴太兴,等.可见光照射下染料茜素红的光催化降解机理[J].催化学报,1999,20(3):359-361.
[11]Hou Y D,Wang X C,Wu L,et al.N-doped Si O2/Ti O2mesoporous nanoparticles w ith enhanced photocatalytic activity under visible-light irradiation[J].Chemoshpere,2008,72(3):414-421.
[12]Desmartin-Chomel A,Flores J L,Bourane A,et al.Calorimetric and FTIR study of the acid properties of sulfated titanias[J].Journal of Physical Chemistry B,2006,110(2):858-863.
[13]肖信,张敬环,南俊民.铁离子掺杂磁载Ti O2光催化剂的制备及光催化性能[J].硅酸盐学报,2008,36(11):1548-1551.
[14]王红侠,李新星,吴朝政,等.花状Ti O2的制备及光催化性能研究[J].人工晶体学报,2016,45(10):2478-2482.
[15]唐守强,何菁萍,张昭.铁掺杂介孔二氧化钛的制备及其光催化性能[J].硅酸盐学报,2012,40(7):950-956.
[16]崇庆文,董延茂,赵丹,等.超声辅助制备掺铁Ti O2催化剂降解腐植酸的研究[J].水处理技术,2014,40(4):47-51.
[17]苏洁,程文,周汉波,等.新型磁性离子交换吸附Ti O2@Fe3O4/聚吡咯树脂复合材料制备及其吸附性能[J].复合材料学报,2017,34(2):231-239.
[18]唐玉朝,伍昌年,黄显怀,等.p H值对介孔Ti O2吸附水中低质量浓度As(Ⅲ)的影响研究[J].安全与环境学报,2013,13(2):17-22.
[19]Song S Z,Sheng Z Y,Liu Y,et al.Influences of p Hvalue in deposition-precipitation synthesis process on Ptdoped Ti O2catalysts for photocatalytic oxidation of NO[J].Journal of Environmental Sciences,2012,24(8):1519-1524.
[2]彭淑静,唐立丹,王冰.Fe掺杂Ti O2纳米线阵列的制备及光催化性能研究[J].电子元件与材料,2016,35(8):41-45.
[3]付文,王丽,黄军左.Ag/Ti O2光催化降解茜素红[J].工业催化,2012,20(1):72-75.
[4]金冲,张卫国,姚素薇,等.热处理工艺对Ti O2纳米管阵列结构及其光电性能的影响[J].无机材料学报,2012,21(1):54-58.
[5]付文,李美书,王丽.Ti O2/Fe2O3光催化降解茜素红溶液[J].应用化工,2016,45(3):466-469.
[6]赵占中,谢银德,张冰,等.掺杂改性Ti O2可见光光催化剂研究的最新进展[J].硅酸盐通报,2012,31(1):92-95.
[7]Choi W,Termin A,Hoffmann M R.The role of metal ion dopants in quantum-sized Ti O2:correlation between photoreactivity and charge carried recombination dynamics[J].Journal of Physical Chemistry,1994,98(51):13669-13679.
[8]吴迎秋,袁强,李辉.Co/Ti O2催化剂对茜素红的降解探究[J].环保科技,2010,16(2):1-4.
[9]Hidaka H,Zhao J C,Pelizzetti E,et al.Photodegradation of surfactants VIII.Comparison of photocatalytic process betw een anionic sodium dodecylbenzenesulfonate and catonic benzyldodecyldimethylammonium chloride on the Ti O2surface[J].Journal of Physical Chemistry,1992,96(5):2226-2230.
[10]刘光明,张天永,吴太兴,等.可见光照射下染料茜素红的光催化降解机理[J].催化学报,1999,20(3):359-361.
[11]Hou Y D,Wang X C,Wu L,et al.N-doped Si O2/Ti O2mesoporous nanoparticles w ith enhanced photocatalytic activity under visible-light irradiation[J].Chemoshpere,2008,72(3):414-421.
[12]Desmartin-Chomel A,Flores J L,Bourane A,et al.Calorimetric and FTIR study of the acid properties of sulfated titanias[J].Journal of Physical Chemistry B,2006,110(2):858-863.
[13]肖信,张敬环,南俊民.铁离子掺杂磁载Ti O2光催化剂的制备及光催化性能[J].硅酸盐学报,2008,36(11):1548-1551.
[14]王红侠,李新星,吴朝政,等.花状Ti O2的制备及光催化性能研究[J].人工晶体学报,2016,45(10):2478-2482.
[15]唐守强,何菁萍,张昭.铁掺杂介孔二氧化钛的制备及其光催化性能[J].硅酸盐学报,2012,40(7):950-956.
[16]崇庆文,董延茂,赵丹,等.超声辅助制备掺铁Ti O2催化剂降解腐植酸的研究[J].水处理技术,2014,40(4):47-51.
[17]苏洁,程文,周汉波,等.新型磁性离子交换吸附Ti O2@Fe3O4/聚吡咯树脂复合材料制备及其吸附性能[J].复合材料学报,2017,34(2):231-239.
[18]唐玉朝,伍昌年,黄显怀,等.p H值对介孔Ti O2吸附水中低质量浓度As(Ⅲ)的影响研究[J].安全与环境学报,2013,13(2):17-22.
[19]Song S Z,Sheng Z Y,Liu Y,et al.Influences of p Hvalue in deposition-precipitation synthesis process on Ptdoped Ti O2catalysts for photocatalytic oxidation of NO[J].Journal of Environmental Sciences,2012,24(8):1519-1524.