Panek Rafał, Medykowska Magdalena, Szewczuk-Karpisz Katarzyna, Wiśniewska Małgorzata
Department of Geotechnical Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland.
Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
Materials (Basel). 2021 Jun 2;14(11):3018. doi: 10.3390/ma14113018.
Considering the growing needs of environmental remediation, new effective solutions should be sought. Therefore, the adsorbed amounts of heavy metal ions, such as lead(II) and zinc(II), on the surface of high-carbon fly ash (HiC FA), zeolite--carbon composite (Na-P1(C)) and pure zeolite (Na-P1), were investigated. The applied solids were characterized using the following techniques: XRD, SEM-EDS, TEM, porosimetry, SLS, electrophoresis and potentiometric titration. The heavy metal concentration in the probes was determined by applying ICP-OES spectroscopy. Adsorption/desorption and electrokinetic measurements were performed in the systems containing one or two adsorbates. The obtained results indicated that Pb(II) ions are adsorbed in larger amounts on the investigated solid surface due to the molecular sieving effect. The largest adsorption capacity relative to lead(II) ions was observed for pure Na-P1 zeolite (407 mg/g). The simultaneous presence of Pb(II) + Zn(II) mixed adsorbates minimally affects the amount of adsorbed Pb(II) ions and causes a significant decrease of Zn(II) ion adsorption (in comparison with analogous systems containing single adsorbates). It was also shown that all solids can be efficiently regenerated using hydrochloric acid. Thus, the selected pure zeolite can be successfully applied in soil remediation or other purifying technologies as an effective Pb(II) adsorbent.
考虑到环境修复需求的不断增长,应寻求新的有效解决方案。因此,研究了高碳粉煤灰(HiC FA)、沸石-碳复合材料(Na-P1(C))和纯沸石(Na-P1)表面对铅(II)和锌(II)等重金属离子的吸附量。采用以下技术对所用固体进行表征:X射线衍射(XRD)、扫描电子显微镜-能谱分析(SEM-EDS)、透射电子显微镜(TEM)、孔隙率测定、静态激光散射(SLS)、电泳和电位滴定。通过电感耦合等离子体发射光谱法(ICP-OES)测定探针中的重金属浓度。在含有一种或两种吸附质的体系中进行吸附/解吸和电动测量。所得结果表明,由于分子筛效应,Pb(II)离子在被研究的固体表面上的吸附量更大。对于纯Na-P1沸石,观察到其对铅(II)离子的最大吸附容量为407 mg/g。Pb(II)+Zn(II)混合吸附质的同时存在对吸附的Pb(II)离子量影响最小,并导致Zn(II)离子吸附量显著降低(与含有单一吸附质的类似体系相比)。研究还表明,所有固体都可以用盐酸有效地再生。因此,所选的纯沸石作为一种有效的Pb(II)吸附剂可成功应用于土壤修复或其他净化技术。