摘要
以Sol-Gel法制备TiO2溶胶和掺杂钇的TiO2溶胶为柱化剂，制备出了TiO2柱撑膨润土和掺杂钇的TiO2柱撑膨润土；X射线衍射分析表明，经柱撑后的膨润土层间距明显增大，达1．9nm以上，经500℃煅烧后其层间距稳定在1．8nm以上。研究了茜索红在4种TiO2柱撑膨润土上的吸附行为。结果表明，4种TiO2柱撑膨润土吸附染料茜素红的速率和吸附量均较大，其吸附动力学行为均遵循Bangham方程和Langmuir方程所描述的规律。平衡吸附量qc与平衡浓度ρc之间的关系符合Freundlich和Langmuir等温吸附方程。其吸附均为吸热过程，吸附热值在20～23kJ／mol范围，吸附表现为表面物理吸附和离子交换作用。
TiO2 pillared bentonite and yttrium doped TiO2 pillared bentonite were prepared respectively by the sol-gel method from bentonite with TiO2 gelation and yttrium doped TiO2 gelation. They were characterized by XRD and the interlayer distance of them obviously increased to 1.9 nm or more and remained at 1.8 nm or more after 500 ℃ calcinations. The adsorptions of alizarin red on four TiO2 pillared bentonite samples were also studied. The results show that the speed and adsorbability of alizarin red dye on four TiO2 pillared bentonites are much higher. The adsorption dynamics follows the laws of Bangham and Langmuir. The relationship between adsorbing capacity （ qc ） and equilibrium mass concentration （ρc） is in accordance with the isothermal adsorption equations of Freundlich and Langmuir. The adsorptions are all endothermic process. The adsorption heat values range from 20 kJ/mol to 23 kJ/mol. The absorption exhibits both surface physical adsorption and ion-exchange mechanism.
出处
《应用化学》
CAS
CSCD
北大核心
2006年第3期305-308,共4页
Chinese Journal of Applied Chemistry
基金
沈阳市高科技创业种子基金资助项目(04Z029)
关键词
柱撑膨润土
吸附
茜素红
动力学
热力学
pillared bentonite, adsorption, alizarin red, kinetics, thermodynamics
