Flieger Jolanta, Kawka Justyna, Płaziński Wojciech, Panek Rafał, Madej Jarosław
Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland.
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland.
Materials (Basel). 2020 Nov 21;13(22):5271. doi: 10.3390/ma13225271.
Zeolites are materials with known sorption properties. The sorption is thought to progress mainly by ion exchange with Na, K, Mg, Ca or H from the zeolite exchange sites. The aim of the study was to compare the sorption properties of natural and synthetic zeolites on the example of the removal of selected metals from aqueous acidic solutions. Uptake experiments for selected ions of chromium, manganese, selenium, nickel, cobalt, and iron were performed using the batch and kinetic column methods. The sorption of the individual metal ions in mg per 1g of sorbent was determined for each sorbent. The relative affinity sequence of the examined cations toward the various sorbent was presented. The Langmuir model was used to model the adsorption equilibrium. Vermiculite under 1 mm of diameter (SF), Na-X, and Na-A were proved to be the most suitable for the individual uptake of studied metal ions. It was observed that the behavior of selenium ions differed from the remaining ones which was interpreted that selenium undergoes adsorption in the anionic form. The fixed-bed column studies were performed using Na-A, ensuring the sorption of selenium in the presence of iron(III) ions. The experiments were conducted using Na-X zeolite pre-loaded by Fe(III) as well as unmodified sorbent eluted by an equimolar mixture containing 100 ppm of Fe and Se. Obtained results prove that selenium sorption improves if other metal ions such as iron appear in the acidic solution. That efficient selenium sorption conditions can be applied to remove selenium which was recognized as toxic at higher levels.
沸石是具有已知吸附特性的材料。人们认为吸附主要通过与沸石交换位点上的钠、钾、镁、钙或氢进行离子交换来进行。该研究的目的是以从酸性水溶液中去除选定金属为例，比较天然沸石和合成沸石的吸附特性。使用分批法和动力学柱法对铬、锰、硒、镍、钴和铁的选定离子进行了吸附实验。测定了每种吸附剂对每克吸附剂中各金属离子的吸附量（单位为毫克）。给出了所研究阳离子对各种吸附剂的相对亲和序列。使用朗缪尔模型对吸附平衡进行建模。直径小于1毫米的蛭石（SF）、Na-X和Na-A被证明最适合单独吸附所研究的金属离子。观察到硒离子的行为与其他离子不同，这被解释为硒以阴离子形式被吸附。使用Na-A进行了固定床柱研究，以确保在铁（III）离子存在下对硒的吸附。实验使用预先负载铁（III）的Na-X沸石以及用含有100 ppm铁和硒的等摩尔混合物洗脱的未改性吸附剂进行。所得结果证明，如果酸性溶液中存在其他金属离子如铁，硒的吸附会得到改善。可以应用有效的硒吸附条件来去除在较高水平被认为有毒的硒。
