摘要
本文介绍了水溶液中离子或分子的水合、吸附剂表面的双电层模型以及内层与外层表面络合物,在此基础上讨论了离子强度对吸附的影响.一般来说,溶液的离子强度增大时,吸附质与吸附剂之间的静电作用减弱,疏水作用增强,络合作用变化不大.电解质离子能通过与吸附质离子产生离子交换竞争、对吸附质产生盐析或盐溶效应、改变溶液中大分子吸附质分子的大小、与吸附质离子形成离子对等方式影响吸附。
The effect of ionic strength on the adsorption at solid/liquid interface has been discussed based on the introduction of the hydration of molecules and ions,the Stern and classical triple-layer models at metal oxide/water solution interfaces,and inner and outer sphere surface complexes.Generally speaking,with the increase in ionic strength,the electrostatic interactions between adsorbents and adsorbates decrease,and the hydrophobic interactions increase,the complexation does not have any obvious changes.Electrolytes affect adsorption by ion exchange competition with adsorbate ions,by salting-in and salting-out effects on adsorbates,by changing adsorbate molecular size,and by forming ion pairs with adsorbates,etc.
出处
《环境化学》
CAS
CSCD
北大核心
2010年第6期997-1003,共7页
Environmental Chemistry
基金
福建省自然科学基金(E0710016)
国家自然科学基金(50972151)
中国科学院"百人计划"基金(0660011106)资助项目
关键词
吸附
离子强度
静电作用
疏水作用
络合作用
adsorption
ionic strength
electrostatic interaction
hydrophobic interaction
complexation.
