化工环保2026，Vol.46Issue(3)：361-370,10.DOI:10.3969/j.issn.1006-1878.2026.03.008
KH-Fh的制备及其对Cd(Ⅱ)的吸附性能
KH-Fh preparation and its adsorption ability for Cd(Ⅱ)
摘要
Abstract
The silane coupling agent 3-aminopropyltriethoxysilane(KH550)was employed to modify ferrihydrite(Fh).KH550-modified ferrihydrite(KH-Fh)was prepared and characterized.The adsorption ability and mechanism of KH-Fh for Cd(Ⅱ)in solution were investigated.The characterization results show that—Si—OH and—NH2 functional groups are successfully introduced onto the Fh surface after KH550 modification.Cd(Ⅱ)adsorption onto KH-Fh is a spontaneous and endothermic process.The adsorption isotherms are well fitted by both the Langmuir and Freundlich models.At 25℃,the saturated adsorption capacity of KH-Fh for Cd(Ⅱ)reaches 25.77 mg/g,2.32 times that of Fh(11.10 mg/g).The adsorption kinetics are well described by the pseudo-second-order kinetic model.Cd(Ⅱ)adsorption capacity increases with high NaNO3 concentration and pH.K+shows little effect on Cd(Ⅱ)adsorption capacity.The addition of Na+significantly promotes Cd(Ⅱ)adsorption,while Ca2+slightly decreases the Cd(Ⅱ)adsorption capacity.During the process of KH-Fh-Cd(Ⅱ)adsorption,Cd(Ⅱ)can complex with Fe—OH,Si—OH,and—NH2 to form stable complexes.关键词
有机硅改性/水铁矿/界面调控/Cd(Ⅱ)/吸附机制Key words
organosilicon modification/ferrihydrite/interface regulation/Cd(Ⅱ)/adsorption mechanism分类
资源环境引用本文复制引用
蔡琳,涂书新,李杨,熊双莲,郑倩..KH-Fh的制备及其对Cd(Ⅱ)的吸附性能[J].化工环保,2026,46(3):361-370,10.基金项目
国家自然科学基金面上项目(42277392,42507039). （42277392,42507039）
