摘要
采用批式吸附试验法,研究了不同吸附时间、固液比、pH和Sr^(2+)初始浓度条件下高庙子钙基膨润土和钠基膨润土对Sr的吸附行为。结果表明,钙基膨润土和钠基膨润土对Sr^(2+)的吸附属于较为迅速的化学吸附,两者均能够在1~2 h内达到吸附平衡,能很好地与准二级动力学模型拟合,其中钙基膨润土对Sr^(2+)的吸附效果相对更好;随着固液比增大,钙基膨润土和钠基膨润土对Sr^(2+)的吸附率分别增加了51.78%和12.43%,分配系数先降低后趋于稳定;2种膨润土对Sr^(2+)的吸附性能都会随着pH增大而大幅度提升,钙基膨润土在碱性环境下吸附性能提升较快,钠基膨润土在酸性环境下吸附性能提升较快;随着Sr^(2+)初始浓度的增加,钙基膨润土对Sr^(2+)的吸附率降低,钠基膨润土对Sr^(2+)的吸附率先增加后降低。
The batch adsorption experiment was conducted to investigate the adsorption behavior of Gaomiaozi calcium bentonite and sodium bentonite on Sr under the controlled adsorption time,solid-to-liquid ratio,pH value,and initial concentration of Sr^(2+) solution.The results indicated that calcium bentonite exhibited better adsorption capacity on Sr compared with sodium bentonite;the adsorption of sodium bentonite and calcium-bentonite on Sr^(2+) was faster chemical adsorption whose process could be effectively simulated through the pseudo-second-order kinetic model,and both bentonitescould completely adsorb Sr^(2+) within 1~2 h,whereas the calcium bentonite had a better adsorption effect;as the solid-liquid ratio increased,the adsorption rate of both bentonites on Sr^(2+) increased by 51.78%and 12.43%respectively,whose distribution coefficient first declined and then stabilized;the adsorption capacity of the two bentonites on Sr^(2+) remarkably improved with the increase of pH,whereas that of calcium bentonite in alkaline environments and sodium bentonite in acidic environments improved faster;as the initial concentration of Sr^(2+)increased,the adsorption rate of calcium bentonite decreased while that of sodium bentonites first increased and then decreased.
作者
陈孔磊
梁维云
秦刘洋
施航向
张芹
赵延平
CHEN Konglei;LIANG Weiyun;QIN Liuyang;SHI Hangxiang;ZHANG Qin;ZHAO Yanping(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin Guangxi 541004;Department of Infrastructure Management,Guilin University of Aerospace Technology,Guilin Guangxi 541004)
出处
《湖北理工学院学报》
2022年第5期14-19,49,共7页
Journal of Hubei Polytechnic University
基金
国家自然科学基金项目(项目编号:119620004)
广西科技基地和人才专项项目(项目编号:桂科AD20325010)
广西岩土力学与工程重点实验室项目(项目编号:桂科岩21-XT-03)
广西高校中青年教师科研基础能力提升项目(项目编号:2019KY0277
2022KY0248)。
关键词
高庙子膨润土
SR
吸附行为
Gaomiaozi bentonite
Sr
adsorption behavior
