TiO_2纳米管的掺杂改性及对水中强力霉素的光催化去除  

On the doping modification of TiO_2 nanotubes and their photocatalytic performance for doxycycline degradation in light-driven

作　　者：张中杰[1] 卢昶雨[1] 彭悦欣 李娇 关卫省[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]西安市市政设施管理局,西安710016

出　　处：《安全与环境学报》2014年第3期184-188,共5页Journal of Safety and Environment

基　　金：高等学校博士学科点专项科研基金项目(20110205110014);国家大学生创新创业训练计划项目(201310710055)

摘　　要：TiO2光催化技术可将水体中的抗生素氧化为CO2、H2O和其他无毒的无机物，实现高效氧化处理的目的，且具有发展太阳光的潜力。以TiO2粉末为前驱体，采用水热法制备了未掺杂及掺杂不同比例Ni^2＋的TiO2纳米管，并对样品进行了SEM、TEM、XRD和UV-Vis等表征。以氙灯（250-800nm）为光源、强力霉素为降解对象，模拟测试样品在日光下光催化降解抗生素的活性。结果表明：TiO2粉末经水热反应后，生成了分散性较好的具有均匀中空管状结构的TiO2纳米管，管壁多层且两端开口，Ni^2＋的掺杂不会对TiO2纳米管的微观形貌和晶型结构产生影响；水热法合成的TiO2纳米管的N2吸附-脱附等温线为典型的IUPACIV型等温线，BJH孔径分布曲线表明生成的TiO2纳米管的内径比较均一；与TiO2粉末相比，未掺杂和掺杂Ni^2＋的TiO2纳米管具有较好的光吸收能力，随离子掺杂量增加，样品的吸收边出现了明显的红移；当Ni^2＋掺杂量为1%时，制得的材料对水中强力霉素的光催化去除效果最好，在氙灯光源下反应120min，对强力霉素的降解率高达78.1%。This paper intends to present our research results on the doping modification of TiO2 nanotubes and their photocatalytic performance for doxycycline degradation in the light-driven way. In proceeding with our research, we have synthesized Ni-series doped TiO2 nanotubes in a simple hydrothermal process by taking the titanium dioxide powder as precursors, which had been examined and scanned by using a series of electronic and microscopic methods, such as Electronic microscope techniques （EM）, the transmission electronic microscopy （TEM）, the X-ray diffraction （XRD）, the Brunauer-Emmett Teller method （BET）, and the UV-Vis spectroscopy. In addition, starting from our research demands, we have also done an evaluation of the photocatalytic degradation testing results of the antibiotics by using catalysts we have developed via the visible light and the xenon lamp （ λ =250-800 nm） irradiation. The results of our investigation and analysis prove that it is possible to fabricate regularly uniform nanotubes through hydrothermal process, and endow them with multi-walled homogeneous tubular structures with open ends. In terms of morphological structure, it can be found that there is not any significant difference between the Ni^ 2＋ doped TiO2 nanotubes and the pure TiO2 nanotubes. However, the nitrogen adsorption-desorption isotherm tends to reveal a typical IV adsorption isotherm characterized with the features of mesoporous materials. When analyzing the absorbency by using the UV-Vis spectroscopy and comparing the newly developed TiO2 nanotubes with the TiO2 powder, we can find that, with the increase of amount of the ions added, the said nanotubes can help greatly improve the absorption ability, for the absorption edge can be extended to the visible light region. The above said experiment about the photocatalytic degradation for doxycycline shows that the best degradation ratio can reach 78.1% in 120 min under the irradiation of the xenon lamp with the Ni ^2＋ doped ratio being 1%.

关 键 词：环境工程学 抗生素 强力霉素 二氧化钛纳米管 

分 类 号：X13[环境科学与工程—环境科学] O643.32[理学—物理化学]