摘要
Abstract
In order to further study the competitive adsorption trend among various soil solid phases to rare earth elements,the author combined humic acid with 7 kinds of clay minerals( kaolinite,montmorillonite,illite,vermiculite,chlorite,attapulgite, bentonite)to form a relatively independent mixed adsorption system,and studied their adsorption characteristics to lanthanum and neodymium in rare earth through vibration equilibrium method and ICP detection. The results of data simulation showed that the process of adsorption to rare earth could be better described by Langmuir isothermal equation. The further verification experimental results indicated that:in the La3+ system,the adsorption capacity of humic acid was 3. 0 times that of the clay mineral,and the ad-sorption capacity of 2:1-type clay mineral was 3. 68~5. 44 times that of 1:1-type clay mineral;in the Nd3+ system,the adsorp-tion capacity of humic acid was about 3. 5 times that of the clay mineral,and the adsorption capacity of 2:1-type clay mineral was 3. 49~4. 74 times that of 1:1-type clay mineral;the competitive adsorption among humic acid and 7 kinds of clay minerals had the following trend:humic acid﹥montmorillonite﹥bentonite﹥vermiculite﹥illite﹥attapulgite﹥chlorite﹥kaolins.关键词
腐殖酸/粘土矿物/稀土元素/竞争吸附Key words
Humic acid/Clay minerals/Rare earth element/Competitive adsorption分类
资源环境
