Lead (Pb) ions are a major concern to the environment and human health as they are contemplated cumulative poisons. In this study, facile synthesis of magnetic iron oxide-tea waste nanocomposite is reported for adsorptive removal of lead ions from aqueous solutions and easy magnetic separation of the adsorbent afterwards. The samples were characterised by scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray diffraction, and Braunner-Emmet-Teller nitrogen adsorption study. Adsorptive removal of Pb(II) ions from aqueous solution was followed by ultraviolet-visible (UV-Vis) spectrophotometry. About 95% Pb(II) ion removal is achieved with the magnetic tea waste within 10 min. A coefficient of regression R2 ≃ 0.99 and adsorption density of 18.83 mg g-1 was found when Pb(II) ions were removed from aqueous solution using magnetic tea waste. The removal of Pb(II) ions follows the pseudo-second-order rate kinetics. External mass transfer principally regulates the rate-limiting phenomena of adsorption of Pb(II) ions on iron oxide-tea waste surface. The results strongly imply that magnetic tea waste has promising potential as an economic and excellent adsorbent for the removal of Pb(II) from water.

中文翻译：

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使用氧化铁-茶废料纳米复合材料从水中快速去除铅 (II) 离子 - 动力学研究。

铅 (Pb) 离子是环境和人类健康的主要问题，因为它们被认为是累积毒物。在这项研究中，报道了磁性氧化铁-茶叶废料纳米复合材料的简便合成，用于吸附去除水溶液中的铅离子，并随后易于磁性分离吸附剂。通过扫描电子显微镜、傅里叶变换红外光谱、X 射线衍射和 Braunner-Emmet-Teller 氮吸附研究对样品进行了表征。从水溶液中吸附去除 Pb(II) 离子后进行紫外-可见 (UV-Vis) 分光光度法。磁性茶渣在 10 分钟内可去除约 95% 的 Pb(II) 离子。回归系数 R2 ≃ 0.99，吸附密度为 18。当使用磁性茶叶废料从水溶液中去除 Pb(II) 离子时，发现了 83 mg g-1。Pb(II) 离子的去除遵循准二级速率动力学。外部传质主要调节 Pb(II) 离子在氧化铁-茶叶废物表面吸附的限速现象。结果强烈表明磁性茶叶废料作为一种经济且优异的吸附剂用于去除水中的 Pb(II) 具有广阔的潜力。