摘要
研究了在 2 4 D的影响下 ,Cu2 +在蒙脱石上的吸附与脱附行为 .结果表明 ,有2 4 D存在时 ,Cu2 +在蒙脱石上的吸附低于单纯Cu2 +的吸附 ,而当蒙脱石先吸附 2 4 D后再吸附Cu2 +(连续吸附 )时 ,Cu2 +的吸附比二者同时存在时 (同时吸附 )的效果好 ,表明两种吸附质间存在竞争吸附 .研究还表明 ,所有的吸附过程都符合Langmuir和Freundlich吸附等温模型 .在有 2 4 D同时存在时 ,Cu2 +的脱附最大 ,可达 30 % ;而单纯Cu2 +在蒙脱石上的吸附似乎是不可逆的 。
In this study the effects of 24 D on the adsorption and release of Cu(Ⅱ)on montmorillonite have been investigated.The results show that Cu 2+ adsorption in the presence of 24 D on montmorillonite is lower than in the absence of 24 D.When the clay was previously treated with 24 D,the Cu(Ⅱ)adsorption is better than when both the adsorbates are added simultaneously showing that there exists a competition between Cu and 24 D.In all cases the adsorption processes obey both Langmuir and Freundlich isotherm models.In the simultaneous adsorption,the percentage of Cu desorbed is highest and can reach 30%.However,the percentage of Cu desorbed in the absence of 24 D is lowest,indicating that the Cu adsorption without 24 D seems virtually nonreversible.
出处
《环境化学》
CAS
CSCD
北大核心
2003年第4期345-349,共5页
Environmental Chemistry
基金
国家自然科学基金资助项目 (项目编号 :1 0 0 75 0 2 7)
