Eu^3＋掺杂TiO2纳米晶的制备及光催化降解部分水解聚丙烯酰胺  

Preparation of Eu^(3+) Doped Titania Nanocrystals and Photocatalytic Degradation Partially Hydrolyzed Polyacrylamide

作　　者：李金环[1] 康万利[2] 闫文华[1] 郭伊荇[3] 高洪峰[1] 刘忠和[1] 

机构地区：[1]大庆石油学院,教育部提高油气采收率重点实验室,黑龙江大庆163318 [2]中国石油大学,教育部石油工程重点实验室,山东青岛266555 [3]东北师范大学化学学院,长春130024

出　　处：《物理化学学报》2008年第6期1030-1034,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20573006);泰山学者建设工程(200708);黑龙江省教育厅振兴老工业基地项目(1151gzh01)资助

摘　　要：以四异丙氧基钛(TTIP)为钛源,采用溶胶-凝胶及水热合成方法,制备了不同Eu3+含量的TiO2纳米晶催化剂,运用X射线衍射谱、紫外-可见漫反射光谱仪、X射线光电子能谱仪和电感耦合等离子体原子发射光谱仪等手段对催化剂晶型、微晶尺寸、表面状态、组成及光学性能进行表征.结果表明,所制备的样品均为锐钛矿型纳米晶,粒子尺寸在9nm左右,铕以Eu2O3的形式存在于TiO2的晶格间隙.在紫外光条件下降解部分水解聚丙烯酰胺(HPAM),通过比较Eu3+的不同掺杂量对催化活性的影响,得出Eu3+的最佳掺杂量为2.4%(w),矿化率最终可达67%.通过液质联机测定HPAM降解的中间产物,推断了Eu3+/TiO2降解HPAM的机理.Nanocrystals with different Eu^3＋ doping levels were prepared by sol-gel and hydrothermal synthetic methods using titanium tetraisopropoxide （TTIP） as titanium source. The crystallite size, crystal form, surface shape, composition and optical property of the nanocrystals were characterized by X-ray diffraction patterns, UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma atomic emission spectroscopy. The products exhibited anatase phase structure, with an average size of 9 nm, and Eu^3＋ entered into the crystal cell of TiO2 （interstitial mode） in the form of EuzO3. Furthermore, the photocatalytic activity of prepared Eu^3＋ doped TiO2 was studied by degrading partially hydrolyzed polyacrylamide （HPAM） under UV light irradiation. The results showed that HPAM was completely degraded. Ultimate mineralization ratio reached 67% when Eu^3＋ loading was 2.4% （w）. In addition, intermediate products were detected via liquid chromatography/mass spectrometry, and degradation mechanism was analyzed.

关 键 词：EU^3+掺杂 溶胶-凝胶 光催化 降解 部分水解聚丙烯酰胺 

分 类 号：O614.411[理学—无机化学] O643.32[理学—化学]