This research deals with a highly efficient, selective, low-cost, and recyclable adsorbent for the fast removal of lead (Pb)(II) ions from aqueous solutions, and an investigation of the related adsorption mechanisms. Three types of materials were prepared from pea peels waste using simple, energy-efficient and environmentally friendly treatment. Obtained adsorbents were characterized by elemental analysis, infrared spectroscopy, scanning electron microscopy, Boehm titration, and the main parameters were determined. The highest adsorption capacity was observed for the biochar prepared by heating of pea peels at 600°C for 30 minutes. The uptake of Pb(II) ions on pea peels-derived samples was examined as a function of pH, contact time, and initial Pb2+ concentration. Obtained results from adsorption experiments of Pb(II) ions on the biochar surface indicate high adsorption capacity, and the possibility of its preconcentration and selective removal in the presence of zinc(II) and cadmium(II) ions. This confirms a potential application of such materials in water remediation.

中文翻译：

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利用豌豆皮废物作为可持续资源生产高性能铅（II）离子吸附剂


本研究涉及一种高效、选择性、低成本且可回收的吸附剂，用于快速去除水溶液中的铅 (Pb)(II) 离子，并研究了相关的吸附机制。采用简单、节能、环保的处理方法，利用豌豆皮废料制备了三种材料。采用元素分析、红外光谱、扫描电镜、Boehm滴定法对所得吸附剂进行了表征，并测定了主要参数。通过在 600°C 下加热豌豆皮 30 分钟制备的生物炭观察到最高的吸附容量。研究了豌豆皮样品中 Pb(II) 离子的吸收与 pH、接触时间和初始 Pb2+ 浓度的函数关系。生物炭表面 Pb(II) 离子的吸附实验结果表明，Pb(II) 离子具有较高的吸附能力，并且在锌(II) 和镉(II) 离子存在的情况下可以对其进行预富集和选择性去除。这证实了此类材料在水体修复中的潜在应用。