Wójcik Grzegorz
Department of Inorganic Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland.
Materials (Basel). 2020 May 14;13(10):2256. doi: 10.3390/ma13102256.
The sorption of light lanthanides(III) (La(III), Ce(III), Pr(III), Nd(III)) and chromium(III) ions from acidic solutions on Nitrolite was studied at varying ions concentrations, pH, contact time and temperatures. The sorption capacity of lanthanides(III) and chromium(III) ions were examined in the ranges 2-9 and 2-5, respectively. The adsorption capacities of all metals are increase with the increasing pH (up to initial pH 9), despite the potential precipitation of metals at higher pH values. Therefore, an initial pH 9 of lanthanides gives the highest adsorption capacities. The kinetics of sorption chromium(III) and light lanthanides(III) were investigated. The experimental data were analyzed using the pseudo-first-order, pseudo-second-order forms, Elovich, and intra-particle diffusion models. The sorption kinetics of investigated ions was described by pseudo-second-order model the best. The results indicate the endothermic process of Cr(III), La(III), Ce(III), Pr(III) and Nd(III) ions sorption. The sorption capacities of La(III) 4.77 mg/g, Ce(III) 4.45 mg/g, Pr(III) 4.30 mg/g, Nd(III) 4.13 mg/g and Cr(III) 2.39 mg/g were calculated from the Langmiur model, which describes adsorption better than Freundlich and Dubinin-Radushkevich.
研究了在不同离子浓度、pH值、接触时间和温度下，酸性溶液中轻镧系元素（III）（镧（III）、铈（III）、镨（III）、钕（III））和铬（III）离子在Nitrolite上的吸附情况。分别考察了镧系元素（III）和铬（III）离子在2 - 9和2 - 5范围内的吸附容量。尽管在较高pH值下金属可能会沉淀，但所有金属的吸附容量都随pH值的升高（直至初始pH值为9）而增加。因此，镧系元素初始pH值为9时吸附容量最高。研究了铬（III）和轻镧系元素（III）的吸附动力学。实验数据采用准一级、准二级形式、埃洛维奇模型和颗粒内扩散模型进行分析。研究离子的吸附动力学用准二级模型描述效果最佳。结果表明Cr（III）、La（III）、Ce（III）、Pr（III）和Nd（III）离子的吸附过程是吸热的。根据朗缪尔模型计算出La（III）的吸附容量为4.77 mg/g、Ce（III）为4.45 mg/g、Pr（III）为4.30 mg/g、Nd（III）为4.13 mg/g、Cr（III）为2.39 mg/g，该模型比弗罗因德利希模型和杜比宁 - 拉杜舍维奇模型对吸附的描述更好。
