岩土工程学报2024，Vol.46Issue(z2)：54-59,6.DOI:10.11779/CJGE2024S20018
聚合物改性膨润土对Pb(Ⅱ)离子的吸附特性研究
Sorption properties of polymer-modified bentonite to Pb(Ⅱ)ions
摘要
Abstract
To investigate the heavy metal sorption properties of the polymer-modified bentonite(PMB),the batch sorption tests are conducted.The sorption behaviors of the sodium activated calcium-bentonite(NCB)and PMB to Pb(Ⅱ)ions are investigated using four sorption kinetic models(i.e.,pseudo-first-order,pseudo-second-order,intra-particle diffusion,and Elovich models)and four isothermal sorption models(i.e.,Langmuir,Freundlich,D-R,and Temkin models).Additionally,the specific surface area and pore size distribution of the bentonites are analyzed the through BET(Brunauer-Emmett-Teller)tests.The results indicate that at solution pH=1(strong acidity),the sorption efficiency of the PMB to Pb(Ⅱ)ions is 60%,with an improvement of 33%over the NCB.The sorption kinetics of bentonites to Pb(Ⅱ)ions conformes more closely to the pseudo-second-order model,with the PMB rapidly adsorbing Pb(Ⅱ)ions within the first 5 minutes,achieving the sorption rate of 50%.The Langmuir sorption isotherm model provides a better description of the sorption characteristics of both bentonites to Pb(Ⅱ)ions,and the calculated maximum sorption capacity closely matches the testing results.关键词
膨润土/聚合物改性/吸附性能/铅离子Key words
bentonite/polymer modification/sorption property/Pb(Ⅱ)ion分类
建筑与水利引用本文复制引用
姜璐莎,蒲诃夫,闵明,邱金伟,陈晓雄..聚合物改性膨润土对Pb(Ⅱ)离子的吸附特性研究[J].岩土工程学报,2024,46(z2):54-59,6.基金项目
国家重点研发计划项目(2019YFC1806000) （2019YFC1806000）
国家自然科学基金项目(52078235,52208329) （52078235,52208329）
