Nano composite a potential low cost adsorbent for removal of cyanine acid

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• 作者：Saeedeh Hashemian ; ^{Sa_hashemian@yahoo.com} ; Mahdi Salimi
• 关键词：Adsorption ; Cyanine acid blue (CAB) ; CuFe2O4/sawdust ; Nano composite
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 April, 2012
• 卷：188
• 期：Complete
• 页码：57-63
• 文件大小：854 K

摘要

In this study, CuFe₂O₄/sawdust nano magnetic composite was prepared by chemical co-precipitation method. The nano composite was characterized by Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). SEM image showed the spherical shape with particle size 50 nm for CuFe₂O₄/sawdust composite. The CuFe₂O₄/sawdust composite was used for removal of cyanine acid blue (CAB) from aqueous solution. The maximum percentage of CAB adsorption was found at pH 2 and 15 min contact time with CuFe₂O₄/sawdust composite. Kinetic and isotherm studies were carried out. The sorption was analyzed using pseudo-first order and pseudo-second order kinetic model. The sorption kinetics was found to follow a pseudo-second order kinetic model. The equilibrium data in aqueous solutions were fitted to Langmuir and Freundlich isotherm and the equilibrium adsorption of CAB was best described by Langmuir isotherm model. The thermodynamic parameters like standard Gibb's free energy (螖G掳), enthalpy (螖H掳) and entropy (螖S掳) were evaluated. The adsorption of CAB onto CuFe₂O₄/sawdust composite is exothermic and negative value of 螖G掳 confirms the spontaneous process. The solid composite could be conveniently regenerate after adsorption.