Foroutan Rauf, Esmaeili Hossein, Abbasi Mohsen, Rezakazemi Mashallah, Mesbah Mohammad
a Department of Chemical Engineering , Bushehr Branch, Islamic Azad University , Bushehr , Iran.
b Department of Chemical Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering , Persian Gulf University , Bushehr , Iran.
Environ Technol. 2018 Nov;39(21):2792-2800. doi: 10.1080/09593330.2017.1365946. Epub 2017 Aug 28.
In this study, brown algae-modified biomass Padina sanctae crucis was used for copper (Cu(II)) and cobalt (Co(II)) heavy metal ions adsorption in synthetic wastewater. The effects of solution pH and adsorption efficiency for Cu(II) and Co(II) removal from aqueous solutions were studied. In order to study the kinetic behavior of adsorption, pseudo-first-order, pseudo-second-order kinetic models, liquid film penetration, and Ritchie second-order models were used. The results showed that the pseudo-second-order kinetic model was able to describe adsorbent behavior in comparison to the other models. Moreover, in order to study adsorbent equilibrium behavior, Langmuir and Freundlich isothermal models were used. Based on the Langmuir model, the adsorption capacity of Co(II) and Cu(II) was determined and their values were 13.73 and 13.996 mg/g, respectively. It was shown that both metal ions adsorption process is favorable and adsorption is physical. In this research, thermodynamic parameters were also studied in order to determine Gibbs free energy for both metal ions which were negative, indicating that metal ions adsorption process is spontaneous and the degree of self-adsorption increases as temperature increases.
在本研究中，褐藻改性生物质圣十字蕨藻被用于合成废水中铜（Cu(II)）和钴（Co(II)）重金属离子的吸附。研究了溶液pH值以及从水溶液中去除Cu(II)和Co(II)的吸附效率的影响。为了研究吸附的动力学行为，使用了准一级、准二级动力学模型、液膜扩散和里奇二级模型。结果表明，与其他模型相比，准二级动力学模型能够描述吸附剂的行为。此外，为了研究吸附剂的平衡行为，使用了朗缪尔和弗伦德里希等温模型。基于朗缪尔模型，测定了Co(II)和Cu(II)的吸附容量，其值分别为13.73和13.996 mg/g。结果表明，两种金属离子的吸附过程都是有利的，且吸附为物理吸附。在本研究中，还研究了热力学参数，以确定两种金属离子的吉布斯自由能，其均为负值，表明金属离子的吸附过程是自发的，且自吸附程度随温度升高而增加。
