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TiO_2胶体光催化降解罗丹明B染料 被引量:27

Photocatalytic degradation of dye rhodamine B by nanosized TiO_2 colloids
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摘要 TiO2胶体从钛氧有机物水解制备,表征的方法有:X射线衍射光谱(XRD)、激光散射粒径分布、傅立叶变换红外光谱(FT-IR)、X射线光电子谱(XPS)和透射电子显微镜(TEM)。利用罗丹明B染料分子作为探针分子研究TiO2胶体的光催化活性,分析了pH、催化剂用量、外加氧化剂(H2O2)用量及罗丹明B初始浓度对TiO2胶体光催化活性的影响。结果表明:制备的TiO2胶体粒子平均粒径为13.8 nm(激光散法测定),光催化降解罗丹明B染料的反应属于一级动力学反应,可以用Langmuir-Hinshewood模型加以描述,反应速率常数k1为0.08413 mg/(L.min),平衡吸附常数k2为1.5305 L/mg;在pH为6,TiO2胶体用量为0.04%,H2O2(含量30%)用量为0.2%(V/V),光照度为69.6μW/cm2时,5 h后罗丹明B染料的降解率可达到99%以上;相似的条件,0.2%的P25 TiO2粉体光催化处理染料水时,罗丹明B的降解率为90%。纳米TiO2胶体不仅可以提高罗丹明B的光催化降解率,还具有用量少,可有效降低水处理成本的特点。 Nanosized TiO2colloid was prepared with titanyl organic compound as precursor, and then was characterized by X-ray diffraction (XRD) , particle size distribution, fourier transform infrared spectrometry ( FT- IR), X-ray photo electron spectroscopy (XPS) and transmission electron microscopy (TEM). The effects of pH, TiO2 dosage, H2O2 dosage and initial content of rhodamine B on the photocatalytic activity of TiO2 colloid were investigated. The results indicated that the mean size of the as-prepared TiO2 colloid was 13.8 nm. When the pH was 6, dosage of TiO2 colloid was 0.04 % , and dosage of H2O2 ( content 30% ) was 0.2% (V/V) , the photocatalytic activity of nanosized TiO2 colloid was the best, and more than 99% of the dye rhodamine B was degraded after illumination (69.6 W/cm2) for 5 hours. Comparing to the fact that about 90% of rhodamine B was degraded when 2.0% of P25 TiO2 was applied, the photocatalytic activity of nanosized TiO2 colloid was much better than P25 TiO2. And a detailed Langmuir-Hinshelwood kinetic model was also applied to explain the photodegradation process. The photodegradation reaction is first-order kinetic reaction, the photodegradation rate constant is 0. 08413 mg/(L min), and the adsorption equilibrium constant is 1. 5305 L/mg.
出处 《环境工程学报》 CAS CSCD 北大核心 2012年第6期1863-1870,共8页 Chinese Journal of Environmental Engineering
基金 国家自然科学基金资助项目(61074109)
关键词 TiO2胶体 光催化 罗丹明B TiO2 colloids photocatalytic degradation dye rhodamine B
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  • 1Rodriguez S. M. , Richter C. , Galvez J. B. , et al. Photocatalytic degradation of industrial residual waters. Solar En- ergy, 1996,56(5) :401-410.
  • 2Rodrigues A. C. , Boroski M. , Shimada N. S. , et al. Treatment of paper pulp and paper mill wastewater by coag- nlation-floceulation followed by heterogeneous photocataly- sis. Journal of Photochemistry and Photobiology A: Chem- istry, 2008,194 ( 1 ) : 1-10.
  • 3Molinari R. , Grande C. , Drioli E. , et al. Photocatalytic membrane reactors for degradation of organic pollutants in water. Catalysis Today, 2001,67 ( 1-3 ) :273-279.
  • 4Mozia S. , Morawski A. W. , Toyoda M. , et al. Applica- tion of anatase-phase TiO2 for decomposition of azo dye in a photocatalytic membrane reactor. Desalination, 2009, 241 (1-3) :97-105.
  • 5Yuan Rusheng, Guau Rongbo, Liu Ping, et al. Photocata- lytic treatment of wastewater from paper mill by TiO2 loaded on activated carbon fibers. Colloids and Surfaces A: Physi- cochem. Eng. Aspects, 2007, 293(1-3):80-86.
  • 6Dionysiou D. D. , Balasubramanian G. , Suidan M. T. , et al. Rotating disk photocatalytic reactor: Development, characterization, and evaluation for the destruction of or- ganic pollutants in water. Water Research, 2000,34( 11 ) : 2927 -2940.
  • 7王海,陈德文,王素华,徐广智.二氧化钛胶体界面芳香化合物的光催化分解[J].Chinese Journal of Chemical Physics,1995,8(2):146-153. 被引量:5
  • 8孙奉玉,吴鸣,李文钊,李新勇,顾婉贞,王复东.二氧化钛的尺寸与光催化活性的关系[J].催化学报,1998,19(3):229-233. 被引量:200
  • 9Chen Xiaoquan, Shen Wenhao. Preparation and properties of stable nanocrystalline anatase TiO2 colloids. Chem. Eng. Technol. , 2008,31(9):1277-1281.
  • 10万金泉,张勇,马邕文.多相光催化氧化技术在造纸废水处理中的应用[J].中国造纸学报,2002,17(1):119-121. 被引量:17

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