Abstract The usefulness of untreated powdered eggshell as low-cost adsorbent for the removal of pentachlorophenol (PCP) from aqueous solutions was investigated. The most important parameters affecting the adsorption process, including the pH and ionic strength, were examined. The adsorption characteristics of PCP onto eggshell were evaluated in terms of kinetic and equilibrium parameters. The kinetic data were studied in terms of the pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using the Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. The pseudo-second order model best described the adsorption kinetics. Using the Langmuir equation, the monolayer adsorption capacity of eggshell for PCP was found to be 0.127 mg/g. The results showed that PCP can be effectively removed from aqueous solution employing eggshell as a cheap adsorbent.

中文翻译：

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蛋壳粉吸附去除水溶液中的五氯苯酚

摘要 研究了未经处理的蛋壳粉作为低成本吸附剂从水溶液中去除五氯苯酚 (PCP) 的有用性。检查了影响吸附过程的最重要参数，包括 pH 值和离子强度。PCP 在蛋壳上的吸附特性通过动力学和平衡参数进行评估。根据拟一级、拟二级和颗粒内扩散动力学模型研究动力学数据。使用 Langmuir、Freundlich、Sips 和 Redlich-Peterson 等温线模型分析平衡数据。伪二级模型最好地描述了吸附动力学。使用朗缪尔方程，发现蛋壳对五氯苯酚的单层吸附容量为 0.127 mg/g。