Department of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 974 01, Banská Bystrica, Slovak Republic.
Department of Environmental Technologies, Faculty of Environmental Engineering and Energy, Cracow University of Technology, Warszawska 24, 31-155, Cracow, Poland.
Environ Sci Pollut Res Int. 2024 Apr;31(20):29199-29217. doi: 10.1007/s11356-024-33133-z. Epub 2024 Apr 3.
Slovak bentonite was used as an effective natural adsorbent for the removal of Cd(II) and Co(II). Characterization of the samples was conducted using X-ray diffraction (XRD), high-resolution scanning electron microscopy with an X-ray energy dispersion spectrometer (SEM-EDS), and infrared spectroscopy (FT-IR). Adsorption experiments were carried out for pure water and artificial seawater, each containing cobalt and cadmium cations within the concentration range of 5-60 mg/L. The highest bentonite adsorption capacities of the tested bentonites were 23.5 (Cd) and 32.2 (Co) mg g. The kinetics data revealed that, in addition to chemisorption, intraparticle diffusion contributes to metal removal. The physical and structural properties of bentonites play an important role in adsorption. Bentonite P 135 from the Lieskovec deposit showed the highest efficiency for removing both ions, with removal percentages exceeding 90% and 77.5% for pure water and artificial seawater, respectively. The results indicate the suitability of using Slovak bentonites as an alternative sorbent for both metal extractions. The mechanism of metal ion adsorption on bentonite clay can be understood through surface complexation and ion exchange. The examined bentonite deposits show potential as promising natural sorbents for the removal of cobalt and cadmium cations from polluted waters.
斯洛伐克膨润土被用作去除 Cd(II)和 Co(II)的有效天然吸附剂。使用 X 射线衍射 (XRD)、带有 X 射线能量色散谱仪的高分辨率扫描电子显微镜 (SEM-EDS) 和红外光谱 (FT-IR) 对样品进行了表征。吸附实验在纯水和人工海水中进行，每种水中都含有浓度范围在 5-60 mg/L 的钴和镉阳离子。测试的膨润土的最高膨润土吸附容量分别为 23.5 (Cd) 和 32.2 (Co) mg/g。动力学数据表明，除了化学吸附外，颗粒内扩散也有助于去除金属。膨润土的物理和结构特性在吸附中起着重要作用。来自 Lieskovec 矿床的膨润土 P135 对两种离子的去除效率最高，对纯水和人工海水的去除率分别超过 90%和 77.5%。结果表明，使用斯洛伐克膨润土作为从受污染水中提取这两种金属的替代吸附剂是合适的。金属离子在膨润土上的吸附机理可以通过表面络合和离子交换来理解。研究的膨润土矿床显示出作为从受污染水中去除钴和镉阳离子的有前途的天然吸附剂的潜力。
