摘要
研究了蛭石对Cd2 +的吸附作用。在吸附实验中 ,考察了搅拌时间、蛭石用量、pH值、浓度等因素对吸附作用的影响。结果表明 ,蛭石对Cd2 +具有较强的吸附性能 ,吸附速度快 ;pH是影响吸附的主要因素 ,pH <4.0的酸性环境不利于蛭石对Cd2 +的吸附 ,蛭石吸附Cd2 +最适宜的 pH范围为大于 4.0的中性至微碱性的环境 ;探讨了蛭石的吸附作用机理 ,得出蛭石对Cd2 +的吸附符合Langmuir和Freundlich吸附等温式 ,离子交换作用是主要的吸附形式。
The adsorption of Cd 2+ on vermiculite were studied by experiment. The effects of agitating time,dosage,pH value,ion concentration,etc. on adsorption process were investigated. Results showed that vermiculite had a stronger adsorption capacity to Cd 2+ ;The adsorption process was quick,pH value was the main factor to effect adsorption,when ion concentration was constant,it is not beneficial to the adsorption of vermiculite when pH was lower than 4.0,the best suitable pH scope for vermiculite to adsorb Cd 2+ was neutral or alkali scope when pH was higher than 4.0. The mechanism that vermiculite adsorbed Cd 2+ was studied,Langmuir and Freundlich adsorption equations were suitable to the adsorption of Cd 2+ ,ion exchange was the main form of adsorption.
出处
《化工技术与开发》
CAS
2000年第S1期45-48,共4页
Technology & Development of Chemical Industry
关键词
蛭石
吸附
离子交换
镉
vermiculite
adsorption
ion exchange
cadmium
