Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology, Islamabad, 44000, Pakistan.
Institute of Chemical Engineering & Technology, University of Punjab, Lahore, 54590, Pakistan.
Sci Rep. 2021 Feb 15;11(1):3790. doi: 10.1038/s41598-021-83363-1.
The heavy metals, such as Cr(VI), Pb(II) and Cd(II), in aqueous solutions are toxic even at trace levels and have caused adverse health impacts on human beings. Hence the removal of these heavy metals from the aqueous environment is important to protect biodiversity, hydrosphere ecosystems, and human beings. In this study, magnetic Nickel-Ferrite Nanoparticles (NFNs) were synthesized by co-precipitation method and characterized using X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Field Emission Scanning Electronic Microscopy (FE-SEM) techniques in order to confirm the crystalline structure, composition and morphology of the NFN's, these were then used as adsorbent for the removal of Cr(VI), Pb(II) and Cd(II) from wastewater. The adsorption parameters under study were pH, dose and contact time. The values for optimum removal through batch-adsorption were investigated at different parameters (pH 3-7, dose: 10, 20, 30, 40 and 50 mg and contact time: 30, 60, 90, and 120 min). Removal efficiencies of Cr(VI), Pb(II) and Cd(II) were obtained 89%, 79% and 87% respectively under optimal conditions. It was found that the kinetics followed the pseudo second order model for the removal of heavy metals using Nickel ferrite nanoparticles.
水溶液中的重金属，如六价铬（Cr(VI)）、 铅（Pb(II)）和镉（Cd(II)），即使在痕量水平下也是有毒的，已经对人类健康造成了不良影响。因此，从水环境中去除这些重金属对于保护生物多样性、水圈生态系统和人类健康非常重要。在本研究中，采用共沉淀法合成了磁性镍铁氧体纳米粒子（NFN），并通过 X 射线衍射（XRD）、能量色散光谱（EDS）和场发射扫描电子显微镜（FE-SEM）技术对其进行了表征，以确认 NFN 的晶体结构、组成和形态，然后将其用作吸附剂从废水中去除 Cr(VI)、Pb(II)和 Cd(II)。研究的吸附参数为 pH 值、剂量和接触时间。通过在不同参数（pH 值 3-7、剂量：10、20、30、40 和 50 mg 和接触时间：30、60、90 和 120 min）下进行批量吸附实验，研究了最佳去除率。在最佳条件下，Cr(VI)、Pb(II)和 Cd(II)的去除效率分别达到 89%、79%和 87%。研究发现，使用镍铁氧体纳米粒子去除重金属的动力学遵循准二级模型。
