自制改性A-TiO_2对曙红Y废水的紫外光催化降解
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摘要
对用水热法自制的掺Fe3+改性TiO_2进行了X射线衍射(XRD)和傅立叶变换红外光谱(FTIR)的表征,考察在紫外光照射下用自制TiO_2催化降解曙红Y的效果,研究了曙红Y初始浓度、改性TiO_2用量、掺Fe3+量、光照时间和底物溶液初始pH值等条件对降解的影响和自制TiO_2对曙红Y的暗吸附性能。结果表明,自制改性TiO_2为单纯锐钛矿型晶体(即A-TiO_2);FTIR分析结果中3 400cm-1和1 637cm-1的吸收峰表明试样中含大量-OH,预计它有较好的光催化活性。在质量浓度为15mg/L的曙红Y溶液(pH=4)中,加入掺5%(摩尔分数)Fe3+的自制A-TiO_2粉末,其用量为2g/L,室温(T=16℃)下紫外光(λ=254nm)照射反应35min,曙红Y的最大降解率达到93.57%。于上述优化条件下进行暗吸附研究发现,16min达到暗吸附平衡,自制改性TiO_2对曙红Y的吸附量为1.69mg/g。曙红Y的降解率与吸附率基本成正比。
The doped Fe3+modified TiO_2 prepared via a hydrothermal method was characterized by X-ray diffraction(XRD)and Fourier transform infrared spectrometer(FTIR)technologies.The effect of using self-made TiO_2 to degrade eosin Y under ultraviolet light irradiation was investigated.The effects of initial concentration of eosin Y,the dosage of Fe3+doped modified A-TiO_2,the Fe3+doped amount,illumination time and initial pH value on the degradation of eosin Y were explored,and the dark adsorption performance was also studied.The results show that the self-made modified TiO_2 is a pure anatase crystal(i.e.A-TiO_2);the absorption peaks of 3 400 and 1 637 cm-1 in the FTIR analysis indicate that the samples contain a large number of-OH,it is expected to possess better photo-catalytic performance.The degradation rate of eosin Y reached 93.57%under the following optimizing conditions:the initial volume concentration of eosin Y was 15 mg/L(pH=4),the 5%(molar fraction)dosage of Fe3+doped modified A-TiO_2 was added with 2 g/L,and the illumination time was 35 min under UV-light(λ=254 nm)at room temperature(T=16℃).The dark adsorption study under the above optimized conditions found that the dark adsorption equilibrium was achieved in16 min,and the adsorption capacity was 1.69 mg/g.The photo-catalytic degradation rate of eosin Y is basically proportional to the adsorption rate.
The doped Fe3+modified TiO_2 prepared via a hydrothermal method was characterized by X-ray diffraction(XRD)and Fourier transform infrared spectrometer(FTIR)technologies.The effect of using self-made TiO_2 to degrade eosin Y under ultraviolet light irradiation was investigated.The effects of initial concentration of eosin Y,the dosage of Fe3+doped modified A-TiO_2,the Fe3+doped amount,illumination time and initial pH value on the degradation of eosin Y were explored,and the dark adsorption performance was also studied.The results show that the self-made modified TiO_2 is a pure anatase crystal(i.e.A-TiO_2);the absorption peaks of 3 400 and 1 637 cm-1 in the FTIR analysis indicate that the samples contain a large number of-OH,it is expected to possess better photo-catalytic performance.The degradation rate of eosin Y reached 93.57%under the following optimizing conditions:the initial volume concentration of eosin Y was 15 mg/L(pH=4),the 5%(molar fraction)dosage of Fe3+doped modified A-TiO_2 was added with 2 g/L,and the illumination time was 35 min under UV-light(λ=254 nm)at room temperature(T=16℃).The dark adsorption study under the above optimized conditions found that the dark adsorption equilibrium was achieved in16 min,and the adsorption capacity was 1.69 mg/g.The photo-catalytic degradation rate of eosin Y is basically proportional to the adsorption rate.
引文
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[2]杨在志,傅小明,孙虎,等.介孔TiO2纳米光催化材料的水热合成及表征[J].有色金属工程,2018,8(1):42-46.YANG Zaizhi,FU Xiaoming,SUN Hu,et al.Hydrothermal synthesis and characterization of mesoporous TiO2 nano photocatalytic materials[J].Nonferrous Metals Engineering,2018,8(1):42-46.
[3]金冲,张卫国,姚素薇,等.热处理工艺对TiO2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.JIN Chong,ZHANG Weiguo,YAO Suwei,et al.Effect of heat-treatment process on the structure and photoelectric performance of TiO2 nanotube arrays[J].Journal of Inorganic Materials,2012,21(1):54-58.
[4]杨贞妮,刘强,朱忠其,等.钒掺杂TiO2粉末的制备及性能[J].粉末冶金材料科学与工程,2009,14(1):63-66.YANG Zhenni,LIU Qiang,ZHU Zhongqi,et al.Preparation and properties of V-doped TiO2 powders[J].Materials Science and Engineering of Powder Metallurgy,2009,14(1):63-66.
[5]赵占中,谢银德,张冰,等.掺杂改性TiO2可见光光催化剂研究的最新进展[J].硅酸盐通报,2012,31(1):92-95,105.ZHAO Zhanzhong,XIE Yinde,ZHANG Bing,et al.Advances on doped TiO2 visible light driven photocatalysts[J].Bulletin of the Chinese Ceramic Society,2012,31(1):92-95,105.
[6]李沙沙.TiO2/WO3复合材料的制备及其光催化性能[J].有色金属工程,2018,8(2):39-43.LI shasha.Preparation of TiO2/WO3 composites and their photocatalytic properties[J].Nonferrous Metals Engineering,2008,8(2):39-43.
[7]李晓俊,司德君,方均,等.铁和铈共掺杂二氧化钛中的协同效应[J].化学物理学报,2006,19(6):539-545.LI Xiaojun,SI Dejun,FAN Jun,et al.Co-doping of iron and cerium in titanium doxide:observation of cooperative effect[J].Chinese Journal of Chemical Physics,2006,19(6):539-545.
[8]白爱民,邹欣平,杨水金.镧掺杂二氧化钛光催化降解品红溶液的研究[J].稀有金属,2005,29(4):549-552.BAI Aimin,ZOU Xinping,YANG Shuijin.Photocatalytic degradation of waste water from magenta solution using La2O3-doped TiO2 catalyst[J].Chinese Journal of Rare Metals,2005,29(4):549-552.
[9]张一兵.锐钛矿型TiO2薄膜的水热法制备及其表征[J].化工新型材料,2016,44(12):97-99.ZHANG Yibing.Prepration and characterization of anatase TiO2thin films via hydrothermal reaction[J].New Chemical Materials,2016,44(12):97-99.
[10]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):1548-1551.XIAO Xin,ZHANG Jinghuan,NAN Junmin,et al.Preparation and photocatalytic properties of Fe(III)-doped TiO2magnetically separable photocatalyst[J].Journal of the Chinese Ceramic Society,2008,36(11):1548-1551.
[11]WANG H,XU Q,ZHENG X,et al.Synthesis mechanism,enhanced visible-light photocatalytic properties,and photogener-ated hydroxyl radicals of PS@CdS core-shell nanohybrids[J].Journal of Nanoparticle Research,2014,16(12):1-15.
[12]HOU Y D,WANG X C.N-doped SiO2/TiO2mesoporous nanoparticles with enhanced photocatalytic activity under visible-light irradiation[J].Chemoshpere,2008,72(3):414-421.
[13]CHEN X B,BURDA C.The electronic origin of the visible-light absorption properties of C-,N-and S-doped TiO2 nanomaterials[J].Journal of the American Chemical Society,2008,130(15):5018-5019.
[14]蒲玉英,廖锦云,李浩,等.光电催化协同降解曙红研究[J].华南师范大学学报(自然科学版),2006(4):93-99.PU Yuying,LIAO Jinyun,LI Hao,et al.Synergetic degradation eosin by electrolysis-photocatlysis process[J].Journal of South China Normal University(Natural Science Edition),2006(4):93-99.
[15]吴忠杰,张国庆,傅李鹏,等.镍网负载纳米TiO2光催化反应器对酸性品红脱色效果实验研究[J],环境工程学报,2010,4(2):342-346.WU Zhongjie,ZHANG Guoqing,Fu lipeng,et al.Experimental invesitigation on the decoloration effect of acid fuchsine using photocatalytic reactor of nickel-net coated with nanometer TiO2[J].Chinese Journal of Environmental Engineering,2010,4(2):342-346.
[16]KASHIF N,FENG O.Preparation of Fe3+-doped TiO2nanoparticles and its photo catalytic activity under UVlight[J].Physica B,2010,405(1):221-226.
[17]ZHANG B X,GIUSEPPE M,IOLANDA P,et al.Degradation of 4-n-itrophenol(4-NP)using Fe-TiO2as a heterogeneous photo-Fen-ton catalyst[J].Journal Hazard Material,2010,176(1/2/3):569-574.
[18]花朵,施春红,袁蓉芳,等.金属掺杂对纳米管TiO2光催化性能的影响[J].功能材料,2013,21(44):3163-3167.HUA Duo,SHI Chunhong,YUAN Rongfang.Effect of metal ion-doping on photocatalytic activity of TiO2nanotubes[J].Journal of Functional Materials,2013,21(44):3163-3167.
[19]李丽,朱琨,张兴,等.电动力学技术修复苯酚污染土壤的研究[J].环境污染与防治,2008,30(11):34-39.LI Li,ZHU Kun,ZHANG Xing,et al.Study on electrokinetic remediation of phenol-polluted soil[J].Environmental Pollution&Control,2008,30(11):34-39.
[20]王红侠,李新星,吴朝政,等.花状TiO2的制备及光催化性能研究[J].人工晶体学报,2016,45(10):2478-2482.WANG Hongxia,LI Xinxing,WU Chaozheng,et al.Synthesis and photocatalytic properties of flower-like TiO2[J].Journal of Synthetic Crystals,2016,45(10):2478-2482.
[21]王知彩,李小君,王平.SO2-4改性TiO2催化降解茜素红水溶液[J].中国环境科学,2003,23(5):535-538.WANG Zhicai,LI Xiaojun,WANG Ping.SO2-4modified TiO2 catalytic degradation of alizarin red aqueous solution[J].China Environmental Science,2003,23(5):535-538.