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›› 2008, Vol. 8 ›› Issue (1): 54-59.

• 反应与分离 • 上一篇    下一篇

铝掺杂纳米ZnO颗粒光催化降解活性艳蓝X-BR

苏苏,卢士香,徐文国   

  • 出版日期:2008-02-20 发布日期:2008-02-20

Photocatalytic Degradation of Reactive Brilliant Blue X-BR with Al-doped ZnO Nano-particles

SU Su,LU Shi-xiang,XU Wen-guo   

  1. School of Chemical Engineering and Environment，Beijing Institute of Technology
  • Online:2008-02-20 Published:2008-02-20

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摘要： 以乙酸锌[Zn(CH3COO)2·2H2O]、氢氧化锂(LiOH·H2O)和氯化铝(AlCl3·6H2O)为原料，采用溶胶-凝胶法制备了纯纳米ZnO和掺铝ZnO，并用X射线衍射光谱、傅立叶红外光谱、紫外-可见吸收光谱、X射线光电子能谱和高分辨率透射电子显微镜对其进行了表征. 用紫外灯作为光源，活性艳蓝XB-R溶液为光催化反应模型降解物，研究了ZnO及掺铝ZnO的光催化性能，并考察了前驱体焙烧温度、光催化温度、光照时间、底物浓度、光催化剂的暗吸附性能、铝掺杂量以及催化剂的加入量等因素对降解率的影响. 结果表明，焙烧温度300℃时，晶粒结晶良好，粒径小；掺杂铝离子提高了ZnO的光催化活性，掺杂铝离子浓度为5%(摩尔比)的ZnO的光催化性能最好；掺杂后的样品粒度分布更均匀，且明显变小；在30℃下，加入催化剂浓度为0.1 g/L、降解时间为45 min时，对活性艳蓝XB-R溶液的降解率达到95%.

关键词: 溶胶-凝胶法, 氧化锌, 活性艳蓝XB-R, 光催化降解, 铝掺杂

Abstract: Pure ZnO and Al-doped ZnO particles were prepared using sol-gel method with zinc acetate dehydrate [Zn(CH3COO)2×2H2O], lithium hydroxide monohydrate (LiOH×H2O) and aluminum chloride (AlCl3×6H2O) as raw material. The samples were characterized by means of X-ray diffraction, infrared absorption spectroscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscope. The photocatalytic performance of different ZnO samples was studied using ultraviolet lamp as illumination device and reactive brilliant blue X-BR as stimulant pollutant. The effects of calcining temperature of precursor, photocatalytic temperature, irradiation time, concentration of pollutant, dark adsorption performance of the samples, amount of Al doping and content of catalyst on the degradation rate of reactive brilliant blue X-BR were investigated. The results indicated that when the calcining temperature was 300℃, the ZnO crystals crystallized well and the size of ZnO particles was small. Al doping to ZnO improved the photocatalytic performance of ZnO samples and the uniformity of the particles, but it did not improve the adsorption performance. Moreover, the Al-doped particles became much smaller evidently. In the doped samples (Al doping range 1%~7%), 5%Al-ZnO was the most active. When the reaction temperature was 30℃, the degradation rate of reactive brilliant blue X-BR could reach 95% by catalyst of 0.1 g/L in 45 min.

Key words: sol-gel method, zinc oxide, reactive brilliant blue X-BR, photocatalytic degradation, Al doping