CAJ | 학술논문

以水玻璃和四氯化钛为原料,在不使用有机模板剂、氟离子和晶种的条件下,用水热法合成了钛-硅沸石ETS-10,将La、Ce、Pr和Nd四种稀土元素负载到合成的ETS-10上.通过X射线粉末衍射、N2吸附-脱附、29Si魔角旋转核磁共振、紫外漫反射光谱、X射线荧光光谱等表征手段对负载前后的ETS-10进行了表征.以有机染料甲基橙为底物,考察了负载各种稀土及氢氟酸腐蚀对ETS-10的光催化活性的影响.结果表明,四种稀土元素的引入均可有效提高ETS-10的光催化活性.反应活性提高的程度与稀土元素负载量有关.对ETS-10同时进行氢氟酸腐蚀和稀土元素的负载,可以将ETS-10的光催化活性提高近一倍,与锐钛矿相TiO2相当,但前者更易分离.
이수파리화사록화태위원료,재불사용유궤모판제、불리자화정충적조건하,용수열법합성료태-규비석ETS-10,장La、Ce、Pr화Nd사충희토원소부재도합성적ETS-10상.통과X사선분말연사、N2흡부-탈부、29Si마각선전핵자공진、자외만반사광보、X사선형광광보등표정수단대부재전후적ETS-10진행료표정.이유궤염료갑기등위저물,고찰료부재각충희토급경불산부식대ETS-10적광최화활성적영향.결과표명,사충희토원소적인입균가유효제고ETS-10적광최화활성.반응활성제고적정도여희토원소부재량유관.대ETS-10동시진행경불산부식화희토원소적부재,가이장ETS-10적광최화활성제고근일배,여예태광상TiO2상당,단전자경역분리.
The three dimensional microporous titanosilicate,ETS-l0,was synthesized by a hydrothermal synthesis route using TiC14 and a sodium silicate aqueous solution as starting materials.Lanthanide (La,Ce,Pr,Nd) loaded ETS-10 catalysts were prepared by the impregnation method.The catalysts were characterized by X-ray diffraction,29Si magic angle spinning NMR,UV-Vis diffuse reflectance spectroscopy,N2 adsorption-desorption measurement,and X-Ray fluorescence spectroscopy.The degradation of methyl orange under near-UV light was used to investigate the photocatalytic activity of the catalysts in aqueous suspensions.The lanthanide loaded ETS-10 catalysts exhibit higher activity than the unmodified ETS-10.The combination of loading lanthanide and increasing the surface defects of ETS-10 by a HF treatment gave an enhancement of the photocatalytic activity,which became comparable with that of anatase TiO2.