掺铁的锐钛矿相TiO_2在可见光下催化降解酸性红B的研究
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摘要
对用水热技术制备的掺铁TiO_2粉体进行X射线衍射(XRD)和傅立叶交换红外光谱(FT-IR)表征,以酸性红B模拟废水的降解率,研究自制的掺铁TiO_2粉体的光催化性能。XRD表征显示自制样品为纯锐钛型TiO_2即A-TiO_2;FT-IR结果可知自制样品的晶体结构中存在大量的羟基(OH);光催化结果表明:掺铁能显著提高自制的A-TiO_2光催化效率。当铁的摩尔掺杂量为1.6%时,其光催化活性最好,光照15min与纯TiO_2相比,酸性红B的光催化降解率提高了52.48%;在最佳条件下(酸性红B初始质量浓度为40mg/L、pH为2、摩尔掺铁量为1.6%、催化剂质量浓度为1.5g/L,可见光源40 W白炽灯、光照15min),对酸性红B的降解率达到87.1%。
The as-prepared iron-doped TiO_2 powders via a hydrothermal technique were characterized by Xray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).Photo-catalytic activity of samples was investigated with acid red B as degradation substance under visible-light irradiation.XRD results indicate that the as-prepared TiO_2 crystals are pure anatase(i.e.A-TiO_2).FT-IR results show that there are a lot of OH groups in TiO_2 crystals.The photo-catalysis results show that the doping of iron can significantly improve the photo-catalytic activity of TiO_2.The sample powder with 1.6%(molar fraction)of iron has the best ability of photo-degradation,in comparison with pure TiO_2,and the photo-degradation efficiency could be improved to 52.48% after reaction for 15 min.The best degradation rate of acid red B was achieved at 87.1% under follow optimal conditions:acid red B of the initial concentration c040 mg/L(pH=2),amount of iron-doped 1.6%,catalyst dosage 1.5 g/L and irradiated by 40 Wfilament lamp for15 min at room temperature.
The as-prepared iron-doped TiO_2 powders via a hydrothermal technique were characterized by Xray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).Photo-catalytic activity of samples was investigated with acid red B as degradation substance under visible-light irradiation.XRD results indicate that the as-prepared TiO_2 crystals are pure anatase(i.e.A-TiO_2).FT-IR results show that there are a lot of OH groups in TiO_2 crystals.The photo-catalysis results show that the doping of iron can significantly improve the photo-catalytic activity of TiO_2.The sample powder with 1.6%(molar fraction)of iron has the best ability of photo-degradation,in comparison with pure TiO_2,and the photo-degradation efficiency could be improved to 52.48% after reaction for 15 min.The best degradation rate of acid red B was achieved at 87.1% under follow optimal conditions:acid red B of the initial concentration c040 mg/L(pH=2),amount of iron-doped 1.6%,catalyst dosage 1.5 g/L and irradiated by 40 Wfilament lamp for15 min at room temperature.
引文
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[2]LI H.A Study on Photocatalytic Degradation of Acid Red B in the Presence of Nano TiO2[J].Dyest Color,2007,44(6):43-45(in Chinese).(李红.纳米二氧化钛光催化降解染料酸性红B的实验研究[J].染料与染色,2007,44(6):43-45.)
[3]HAN C H,LI Z Y,SHEN J Y.Photocatalytic Degradation of the Reactive Brilliant Red and Its Mechanism over Nano-sized TiO2-Cu2O Under Visible Irradiation[J].Mater Rev,2014,28(7):4-8(in Chinese).(韩承辉,李智渝,沈俭一.纳米TiO2-Cu2O可见光下光催化降解活性艳红及其机理研究[J].材料导报:研究篇,2014,28(7):4-8.)
[4]CHOI W,TERMIN A,HOFFMANN M R.The Role of Metal Ion Dopants in Quantum-sized TiO2:Correlation between Photoreactivity and Charge Carried Recombination Dynamics[J].J Phys Chem,1994,98(51):13 669-13 679.
[5]ZHANG Y B,JIANG L.Preparation and Characterization of Anatase TiO2 Films via Hydrothermal Reaction by Adding Additive[J].Ordnance Mater Sci Eng,2010,33(3):12-14(in Chinese).(张一兵,江雷.加添加剂水热法简易制备锐钛矿型TiO2薄膜及其表征[J].兵器材料科学与工程,2010,33(3):12-14.)
[6]CHEN Y,CHEN P,CHEN C,et al.Preparation and Properties of La and Fe Co-doping TiO2/ACFComposite Photocatalyst[J].J Funct Mater,2014,45(3):3 135-3 140(in Chinese).(陈勇,陈鹏,陈超,等.La、Fe共掺杂TiO2/活性炭纤维的制备及其光催化性能[J].功能材料,2014,45(3):3 135-3 140.)
[7]XIAO X,ZHANG J H,NAN J M,et al.Preparation and Photocatalytic Properties of Fe(Ⅲ)-doped TiO2 Magnetically Separable Photocatalyst[J].J Chin Ceram Soc,2008,36(11):1 548-1 552(in Chinese).(肖信,张敬环,南俊民,等.铁离子掺杂磁载TiO2光催化剂的制备及光催化性能[J].硅酸盐学报,2008,36(11):1 548-1 552.)
[8]WANG H,XU Q,ZHENG X,et al.Synthesis Mechanism,Enhanced Visible-light-photocatalytic Properties,and Photogenerated Hydroxyl Radicals of PS@CdS Core-shell Nanohybrids[J].J Nanopart Res,2014,16(12):1-15.
[9]CHEN X B,BURDA C.The Electronic Origin of the Visible-light Absorption Properties of C-,N-and S-Doped TiO2 Nanomaterials[J].J Am Chem Soc,2008,130(15):5 018-5 019.
[10]HE L P,YE X Z,FU C,et al.Photo-catalytic Degradation of Acid Red B in Aqueous Solution with Nano Ag-loaded TiO2[J].J Chongqing Three Gorges Univ,2013,29(3):95-99(in Chinese).(何立平,叶先增,付川,等.掺银纳米二氧化钛可见光催化降解酸性红B[J].重庆三峡学院学报,2013,29(3):95-99.)
[11]LIN X,RONG F,JI X,et al.Visible Light Photocatalytic Activity and Photoelectrochemical Property of Fe-doped TiO2 Hollow Spheres by Sol-gel Method[J].J Sol-Gel Sci Technol,2011,59(2):283-289.
[12]WU Y M,ZHANG J L,XIAO L,et al.Preparation and Characterization of TiO2 Photocatalysts by Fe3+Doping Together with Au Deposition for the Degradation of Organic Pollutants[J].Appl Catal B,2009,88:525-532.
[13]DENG L X,WANG S R,LIU D Y,et al.Synthesis,Characterization of Fe-doped TiO2 Nanotubes with High Photocatalytic Activity[J].Catal Lett,2009,129(3-4):513-518.
[14]YU S,YUN H J,LEE D M,et al.Preparation and Characterization of Fe-doped TiO2 Nanoparticles as a Support for a High Performance CO Oxidation Catalyst[J].J Mater Chem,2012,22(25):12 629-12 635.
[15]AMBRUS Z,BALAZS N,ALAPI T,et al.Synthesis,Structure and Photocatalytic Properties of Fe(Ⅲ)-doped TiO2 Prepared from TiCl3[J].Appl Catal B,2008,81(1-2):27-37.
[16]WANG Y F,GU J J,ZHU P P,et al,.Study on Photocatalytic Decolorization of Congo Red Solution with Nanosized CdS/Cellulose Composites[J].Text Aux,2014,31(2):15-19(in Chinese).(王炎峰,顾剑杰,朱翩翩,等.纳米CdS/纤维素复合材料光催化脱色刚果红染料研究[J].印染助剂,2014,31(2):15-19.)
[17]YAN F,XIONG Q.Preparation and Catalytic Performance of Iron Doped Titanium Dioxide Photocatalyst[J].Sci Technol Innovation Herald,2012,(2):124-125(in Chinese).(杨芬,熊倩.掺铁二氧化钛光催化剂的制备及催化性能[J].科技创新导报,2012,(2):124-125.)
[18]TIAN L L,YAO L F,XU R Q,et al.Preparation and Photocatalytic Properties of Bi 3+and Fe3+CoDoped TiO2 Composite Nano-films[J].J Synth Cryst,2011,40(3):710-715(in Chinese).(田琳琳,姚兰芳,许瑞清,等.铋铁共掺纳米TiO2复合薄膜的制备及光催化性能[J].人工晶体学报,2011,40(3):710-715.)
[19]CUI Y M,SUN W Z.Synthesis and Characterization of TiO2Particles and Their Application in the Field of Photocatalytic Degradation of Acid Red B[J].Chin JProcess Eng,2007,7(2):342-346(in Chinese).(崔玉民,孙文中.二氧化钛合成与表征及其在光催化降解酸性红B中的应用[J].过程工程学报,2007,7(2):342-346.)