荧光光谱法研究Eu^3＋在拟薄水铝石纳米胶粒表面的吸附  

Fluorescence Studies of Eu Ions Adsorption on Pseudo-Boehmite Colloidal Particle Surface

作　　者：蒙延双 王达健[3] 武浚 刘会基 巨少华 

机构地区：[1]国家镍钴新材料工程技术研究中心,甘肃兰州730101 [2]金川镍钴研究设计院,甘肃兰州730101 [3]天津理工大学材料物理研究所,300191

出　　处：《光谱学与光谱分析》2009年第1期180-183,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50364002);天津市自然科学基金项目(06YFJMJC02300)资助

摘　　要：拟薄水铝石作为前驱体,加入胶溶剂HNO3调节pH 2.0得到胶粒大小-60 nm的稳定胶体。将Eu（NO3）3溶液加入拟薄水铝石胶体,Eu^3＋在静电引力作用下在拟薄水铝石胶粒表面发生化学吸附。荧光光谱检测结果表明,Eu^3＋592 nm发射峰强度I592随AlOOH∶Eu（NO3）3物质的量之比RBoe/Re的增大而降低。由发射峰强度I592计算出Eu^3＋在拟薄水铝石胶粒表面吸附率R随RBoe/Re增大而增大,当RBoe/Re=4时,吸附率可达53.0%。Eu^3＋在拟薄水铝石胶粒表面的吸附密度D也随RBoe/Re的增大呈上升趋势,且吸附曲线随RBoe/Re分为初始阶段、平缓阶段和饱和阶段。Stable pseudo-boehmite sol was obtained by adding HNO3 as peptizing agent and adjusting pH to be 2.0.TEM result shows that the AlOOH colloidal particle size is about 60 nm.Field emission transmission electron microscope（FETEM） result shows that pseudo-boehmite colloidal particle is composed of 8nm scaled AlOOH nanocrystals.The interaction of Eu3＋ ions and colloidal AlOOH nanoparticle was investigated.The adsorption of Eu3＋ ions on the surface of AlOOH nanocrystal was attributed to the chemical adsorption caused by electrostatic attraction.The photoluminescence characters of Eu3＋ in AlOOH/Eu（NO3）3 composite sol system were investigated.The 529 nm emission intensity of Eu3＋,I592,decreased with the increase in the molar ratio of AlOOH and Eu3＋,RBoe/Re.The adsorption ratio（denoted R） and the adsorption density（denoted D） of Eu3＋ ions on AlOOH colloidal particle surface was calculated from I592.The results show that the values of R and D increase with increasing RBoe/Re.

关 键 词：拟薄水铝胶体 Eu离子 吸附 荧光光谱 

分 类 号：O657.3[理学—分析化学]