Wild herbs (Origanum (OR) and Lavandula (LV)) were used as environment-friendly adsorbents in this study. The adsorbents were used for adsorption of Cu and Ba from water. The adsorption of heavy metals onto OR and LV was dependent on particle size, dose, and solution pH. The diameter of adsorbent particles was less than 282.8 nm. The adsorption follows second-order kinetics. Langmuir and Freundlich models have been applied to describe the equilibrium data, and the thermodynamic parameters, the Gibbs free energy, ∆G°, enthalpy, ∆H°, and entropy, ∆S°, have been determined. The positive value of ∆H° suggests that the adsorption of heavy metals by the wild herbs is endothermic. The negative values of ∆G° at all the studied temperatures indicate that the adsorption is a spontaneous process. It can be concluded that OR and LV are promising adsorbents for the removal of heavy metals from aqueous solutions over a range of concentrations.

中文翻译：

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牛至（OR）和薰衣草（LV）的纳米颗粒从水溶液中吸附铜和钡的研究。

在这项研究中，野生草药（牛至（OR）和薰衣草（LV））被用作环境友好型吸附剂。吸附剂用于从水中吸附铜和钡。重金属在OR和LV上的吸附取决于粒径，剂量和溶液pH值。吸附剂颗粒的直径小于282.8nm。吸附遵循二级动力学。已使用Langmuir和Freundlich模型描述平衡数据，并确定了热力学参数，吉布斯自由能∆ G °，焓∆ H °和熵∆ S °。Δ的正值H °表明野草对重金属的吸附是吸热的。在所有研究温度下ΔG °的负值均表明吸附是自发过程。可以得出结论，OR和LV是在一定浓度范围内从水溶液中去除重金属的有前途的吸附剂。