Adsorption of methylene blue from aqueous solution onto multiporous palygorskite modified by ion beam bombardment: Effect of contact time,temperature, pH and ionic strength |
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| Affiliation: | 1. Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;1. Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia;2. Faculty of Technology, University of El Oued, 39000 El Oued, Algeria;3. Chemistry Department, College of Science, University of Anbar, Ramadi, Iraq;4. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;1. Laboratory of Catalysis, Materials and Environment, School of Technology, University Sidi Mohammed Ben Abdellah Fez, Morocco;2. Laboratory of Biochemistry, Faculty of Medicine and Pharmacy, University Sidi Mohammed Ben Abdellah Fez, Morocco |
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| Abstract: | Our previous work has reported that an inorganic nano-network of palygorskite with multiporous structure can be fabricated from rigid nano-rods by ion beam bombardment and has better adsorption capability than nano-rods. Here, this dispersed modified nano adsorbent was characterized by Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscope (SEM). The adsorption property of methylene blue (MB) onto this adsorbent was investigated. It was found that the adsorption capacity increased with contact time, pH, MB initial concentration, respectively, and then reached an equilibrium. Moreover, the effect of pH on the adsorption was strongly determined by zeta potential. The adsorption kinetics of MB was dominated by the pseudo-second-order reaction model, and the adsorption isotherms fit the Freundlich isotherms better than the Langmuir isotherms. Three temperatures (293 K, 303 K, 313 K) were set for describing the thermodynamic parameters (ΔHθ, ΔSθ, and ΔGθ), which indicated that the adsorption was spontaneous and exothermic. Lastly, the mechanism of the influence of ionic strength on the adsorption was discussed. |
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