Some agricultural byproducts are useful for solving wastewater pollution problems. These byproducts are of low cost and are effective and ecofriendly. The study aim was to investigate the possibility of using pomegranate peel (PP) and date pit (DP) activated carbon (PPAC and DPAC, respectively) as sorbents to remove Cd(II) and Pb(II) from aqueous solutions. Agricultural wastes of DPs and PPs were subjected to carbonization and chemical activation with H₃PO₄ (60%) and ZnCl₂ and used as adsorbents to remove Cd(II) and Pb(II) from their aqueous solutions. The physical characterizations of PPAC and DPAC, including determination of surface area, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier-transform infrared spectroscopy, were performed. The following factors affected adsorption: solution pH, adsorbent dosage, initial metal ion concentration, and contact time. These factors were studied to identify the optimal adsorption conditions. The results showed that the maximum adsorptions of Cd(II) and Pb(II) were achieved at pH ranging from 6 to 6.5, 90 min contact time, and 0.5 g/L for PPAC and 1 g/L for DPAC dosage. Furthermore, the adsorption efficiencies for both Pb(II) and Cd(II) were higher for PPAC than for DPAC. However, the recorded Q_max values for PPAC were 68.6 and 53.8 mg/g for Pb(II) and Cd(II) and for DPAC were 34.18 and 32.90 mg/g for Pb(II) and Cd(II), respectively. The Langmuir isotherm model fit the adsorption data better than the Freundlich model. Kinetically, the adsorption reaction followed a pseudo-second-order reaction model, with q_e ranging from 12.0 to 22.37 mg/g and an R² value of 0.99.

中文翻译：

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用石榴皮和枣核活性炭去除水溶液中的镉和铅离子

一些农业副产品可用于解决废水污染问题。这些副产品成本低，有效且环保。该研究的目的是研究使用石榴皮 (PP) 和枣核 (DP) 活性炭（分别为 PPAC 和 DPAC）作为吸附剂从水溶液中去除 Cd(II) 和 Pb(II) 的可能性。DPs 和 PPs 农业废弃物用 H ₃ PO ₄ (60%) 和 ZnCl ₂进行碳化和化学活化并用作吸附剂从其水溶液中去除 Cd(II) 和 Pb(II)。进行了 PPAC 和 DPAC 的物理表征，包括表面积的测定、扫描电子显微镜、能量色散 X 射线光谱和傅里叶变换红外光谱。以下因素影响吸附：溶液 pH 值、吸附剂用量、初始金属离子浓度和接触时间。研究这些因素以确定最佳吸附条件。结果表明，Cd(II) 和 Pb(II) 的最大吸附在 pH 范围为 6 到 6.5、接触时间为 90 分钟、PPAC 为 0.5 g/L 和 DPAC 剂量为 1 g/L 时实现。此外，PPAC 对 Pb(II) 和 Cd(II) 的吸附效率均高于 DPAC。然而，记录的Q _maxPPAC 的 Pb(II) 和 Cd(II) 值分别为 68.6 和 53.8 mg/g，Pb(II) 和 Cd(II) 的 DPAC 值分别为 34.18 和 32.90 mg/g。Langmuir 等温线模型比 Freundlich 模型更适合吸附数据。在动力学上，吸附反应遵循准二级反应模型，q _e范围为 12.0 至 22.37 mg/g，R ²值为 0.99。