Adsorption studies of methylene blue onto ZnCl2-activated carbon produced from buriti shells (Mauritia flexuosa L.) |
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Affiliation: | 1. Sakarya University, Sciences & Arts Faculty, Chemistry Department, Sakarya 54187, Turkey;2. Bülent Ecevit University, Engineering Faculty, Environmental Engineering Department, Zonguldak 67100, Turkey;1. Instituto de Corrosión y Protección, Pontificia Universidad Católica del Perú, Av. Universitaria 1801, Lima 32, Peru;2. Sección Química, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Av. Universitaria 1801, Lima 32, Peru;1. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China;2. Institute of Energy and Environmental Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China |
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Abstract: | The present study reports the preparation of an activated carbon produced from buriti shells (ACb) using ZnCl2 as activating agent and its ability to remove methylene blue dye (MB) from aqueous solutions. The obtained ACb was characterized by N2 adsorption–desorption isotherms, SEM and FT-IR. The results show that ACb presents microporous features with BET surface area (SBET) of 843 m2 g?1 and functional groups common in carbonaceous materials. Adsorption studies were carried out and experimental data were fitted to three isotherm models (Langmuir, Freundlich, and Redlich–Peterson) and four kinetic models (pseudo-first order, pseudo-second order, Elovich, and intraparticle diffusion). The isotherm model which best fitted to experimental data was Redlich–Peterson. However, the g parameter of this model indicated that the adsorption of MB onto ACb occurs according to the mechanism proposed by Langmuir, which showed maximum monolayer adsorption capacity of 274.62 mg g?1. Kinetic studies demonstrated that the Elovich model is suitable to describe the experimental data. Moreover, it was found that the intraparticle diffusion is the limiting step of adsorption process. |
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Keywords: | Buriti shell Activated carbon Methylene blue Adsorption |
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