Sprynskyy Myroslav, Buszewski Bogusław, Terzyk Artur P, Namieśnik Jacek
Department of Environmental Chemistry and Ecoanalytics, Faculty of Chemistry, Nicolaus Copernicus University, 7 Gagarina Str., 87-100 Toruń, Poland.
J Colloid Interface Sci. 2006 Dec 1;304(1):21-8. doi: 10.1016/j.jcis.2006.07.068. Epub 2006 Jul 29.
The study was carried out on the sorption of heavy metals (Ni2+, Cu2+, Pb2+, and Cd2+) under static conditions from single- and multicomponent aqueous solutions by raw and pretreated clinoptilolite. The sorption has an ion-exchange nature and consists of three stages, i.e., the adsorption on the surface of microcrystals, the inversion stage, and the moderate adsorption in the interior of the microcrystal. The finer clinoptilolite fractions sorb higher amounts of the metals due to relative enriching by the zeolite proper and higher cleavage. The slight difference between adsorption capacity of the clinoptilolite toward lead, copper, and cadmium from single- and multicomponent solutions may testify to individual sorption centers of the zeolite for each metal. The decrease of nickel adsorption from multicomponent solutions is probably caused by the propinquity of its sorption forms to the other metals and by competition. The maximum sorption capacity toward Cd2+ is determined as 4.22 mg/g at an initial concentration of 80 mg/L and toward Pb2+, Cu2+, and Ni2+ as 27.7, 25.76, and 13.03 mg/g at 800 mg/L. The sorption results fit well to the Langmuir and the Freundlich models. The second one is better for adsorption modeling at high metal concentrations.
本研究针对天然斜发沸石及预处理斜发沸石在静态条件下从单组分和多组分水溶液中对重金属（Ni2+、Cu2+、Pb2+和Cd2+）的吸附进行了研究。该吸附具有离子交换性质，包括三个阶段，即微晶表面的吸附、转化阶段以及微晶内部的适度吸附。由于沸石本身的相对富集和更高的解理性，更细的斜发沸石颗粒吸附的金属量更高。斜发沸石对单组分和多组分溶液中铅、铜和镉的吸附容量之间的细微差异可能证明了沸石对每种金属具有各自的吸附中心。多组分溶液中镍吸附量的降低可能是由于其吸附形式与其他金属相近以及竞争作用所致。在初始浓度为80mg/L时，对Cd2+的最大吸附容量确定为4.22mg/g；在800mg/L时，对Pb2+、Cu2+和Ni2+的最大吸附容量分别为27.7mg/g、25.76mg/g和13.03mg/g。吸附结果与朗缪尔模型和弗伦德利希模型拟合良好。在高金属浓度下，后者更适合用于吸附建模。
