Saleem Muhammad Umer, Hussain Humaira, Shukrullah Shazia, Yasin Naz Muhammad, Irfan Muhammad, Rahman Saifur, Ghanim Abdulnoor Ali Jazem
Department of Physics, University of Agriculture Faisalabad, 38040 Faisalabad, Pakistan.
Department of Chemistry, University of Okara, 56300 Okara, Pakistan.
ACS Omega. 2024 Jan 10;9(3):3507-3524. doi: 10.1021/acsomega.3c07200. eCollection 2024 Jan 23.
This study used a simple coprecipitation method to produce pristine, silica-coated, and amino-functionalized CoFeO nanoadsorbents. Amino-functionalization was done to increase the active surface area and metal ion removal efficiency. Both pristine and functionalized adsorbents were employed to recover Pb(II), Zn(II), and Cu(II) ions from wastewater. The adsorption tests were performed by varying the initial concentration of metal ions and contact time at a fixed pH of 6.5. Atomic adsorption spectroscopy was utilized to detect the proportion of metals removed from water. Additionally, the pseudo-first-order, pseudo-second-order, Freundlich, and Langmuir models were employed to compute the kinetic and isothermic data from metal ion adsorption onto the adsorbents. The amino-functionalized adsorbent showed adsorption capacities of 277.008, 254.453, and 258.398 mg/g for Cu(II), Pb(II), and Zn(II) ions, respectively. According to the adsorption results, the Langmuir isotherm and the pseudo-second-order model best suit the data. The best fitting of the pseudo-second-order model with the data indicates that coordinative interactions between amino groups and metal ions are responsible for chemisorption. The metal ions bind with -NH groups on the adsorbent surface through chelate bonds. Chelate bonds are extremely strong and stable, indicating the effectiveness of the CoFeO@SiO-NH adsorbent in adsorbing heavy-metal ions. The tested adsorbent exhibited good performance, batter stability, and good reusable values around 77, 81, and 76% for Cu(II), Pb(II), and Zn(II) ions, respectively, after five adsorption cycles.
本研究采用简单共沉淀法制备了原始的、二氧化硅包覆的和氨基功能化的CoFeO纳米吸附剂。进行氨基功能化是为了增加活性表面积和提高金属离子去除效率。原始吸附剂和功能化吸附剂均用于从废水中回收Pb(II)、Zn(II)和Cu(II)离子。吸附试验通过在固定pH值6.5下改变金属离子的初始浓度和接触时间来进行。利用原子吸收光谱法检测从水中去除的金属比例。此外,采用准一级、准二级、Freundlich和Langmuir模型来计算金属离子吸附到吸附剂上的动力学和等温数据。氨基功能化吸附剂对Cu(II)、Pb(II)和Zn(II)离子的吸附容量分别为277.008、254.453和258.398 mg/g。根据吸附结果,Langmuir等温线和准二级模型最适合这些数据。准二级模型与数据的最佳拟合表明氨基与金属离子之间的配位相互作用是化学吸附的原因。金属离子通过螯合键与吸附剂表面的-NH基团结合。螯合键非常强且稳定,表明CoFeO@SiO-NH吸附剂在吸附重金属离子方面的有效性。经过五个吸附循环后,测试的吸附剂对Cu(II)、Pb(II)和Zn(II)离子分别表现出良好的性能、较好的稳定性和良好的可重复使用价值,分别约为77%、81%和76%。
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