Kinetics and Thermodynamics of Aqueous Copper Adsorption by Ca-Al-Zn LDH and Its Calcined Product | ||||
| Egyptian Journal of Chemistry | ||||
| Article 6, Volume 63, Issue 10, October 2020, Page 3641-3654 PDF (1.53 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2020.26924.2553 | ||||
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| Authors | ||||
Al-Sayed Aly Bakr  1; Reda Abdel Gayed2; Radwan El-Zoheiry3; Ahmed Abdel Wahab Salem 4
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| 1Analysis and Evaluation Department, Egyptian Petroleum Research Institute | ||||
| 2Giza north power station, Ministry of electricity and energy, Giza, Egypt | ||||
| 3Department of Mechanical Power Engineering, Benha Faculty of Engineering, Benha University, Benha, Qalubia, Egypt | ||||
| 4Analysis and evaluation department Egyptian petroleum research institute | ||||
| Abstract | ||||
| The Ca-Al-Zn layered double hydroxide (LDH) which synthesized by co-precipitation method and its calcined product were used in removal of Cu(II) from aqueous solutions. At optimum conditions, the calcined Ca-Al-Zn LDH product has higher potential application in cupreous ions adsorption field (45.2mg/g) than the uncalcined LDH (38.8mg/g). Langmuir and Freudlich models were used to optimizing the adsorption process and pseudo-first and pseudo-second order models were used to evaluating the adsorption kinetics of Cu(II) onto Ca-Al-Zn LDH and its calcined product. Langmuir model fitted the experimental data better than Freundlich model and pseudo-first order model is more sufficient to depict the adsorption kinetics. From thermodynamic studies; Gibbs free energy (∆G°), Enthalpy change (∆H°) and Entropy change (∆S°) revealed that the adsorption processes are a spontaneous, endothermic and randomness processes at the solid-solution interface during adsorption. | ||||
| Keywords | ||||
| Water treatment; Kinetics; Thermodynamics; Ca-Al-Zn LDH; Cu(II) adsorption | ||||
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