Chemistry Department, Faculty of Mathematics and Science, State University of Malang (UM), Jl. Semarang 5, Malang, Indonesia.
Centre of Advanced Materials for Renewable Energy (CAMRY), State University of Malang (UM), Malang, Indonesia.
Sci Rep. 2023 Mar 14;13(1):4213. doi: 10.1038/s41598-023-30893-5.
The adsorption of small particles on the surface of an adsorbent depends on interfacial dynamics and associated parameters, including the adsorbate reactivity, adsorbent surface activity, and matrix porosity and tortuosity. Herein, the effect of the surfaces of magnetite, silica/alumina, and silica-cellulose matrix on cadmium adsorption is termed using spectroscopic methods. Atomic absorption spectroscopy was used to determine the adsorption of metal ions in the solid-liquid interfaces by the batch method with different pH, metal concentrations, and contact times. Cadmium (II) were well adsorbed on the magnetite-inorganic surface (around 90% adsorption) rather than other types of semi-organic surfaces, silica, silica-alumina and other cellulosic materials (less than 60% adsorption for Cadmium (II) and 80% of Lead (II) ions). The presence of lead (II) changed the cadmium adsorption behaviour, indicating that adsorption-desorption was a physical interaction on different surfaces. Most absorptions are pH-dependent, stable for Cadmium ions and vary for Lead ions. Moreover, the adsorption analysis using Langmuir and Freundlich isotherms showed no significant characteristics of chemical interaction of the ions with the surfaces as indicated by low R2 values (both around 0.5) for magnetite materials higher for cellulose materials of Langmuir and Freundlich isotherms. This study is beneficial for various fields, such as material science and environmental chemistry, which will play an essential role in the future.
吸附剂表面上的小颗粒的吸附取决于界面动力学和相关参数，包括吸附物的反应性、吸附剂表面活性以及基质的孔隙率和曲折度。本文采用光谱方法研究了磁铁矿、硅铝酸盐和硅纤维素基质表面对镉吸附的影响。采用原子吸收光谱法，通过不同 pH 值、金属浓度和接触时间的批量法，测定固液界面金属离子的吸附。金属离子在磁铁矿无机表面上（吸附率约为 90%）的吸附性能良好，而在其他半有机表面、硅、硅铝酸盐和其他纤维素材料上的吸附性能较差（镉（II）的吸附率小于 60%，铅（II）离子的吸附率为 80%）。铅（II）的存在改变了镉的吸附行为，表明吸附-解吸是在不同表面上的物理相互作用。大多数吸附作用都依赖于 pH 值，对镉离子稳定，而对铅离子则不同。此外，使用 Langmuir 和 Freundlich 等温线进行的吸附分析表明，离子与表面之间没有明显的化学相互作用特征，这两个等温线的磁铁矿材料的 R2 值都较低（均约为 0.5），而纤维素材料的 Langmuir 和 Freundlich 等温线的 R2 值则较高。这项研究对材料科学和环境化学等各个领域都有好处，在未来将发挥重要作用。
