Carbon based composites have good capability for elimination of colored pollutants. In this work, a multi-walled carbon nanotube-graphite Composite (MW-g-C) was prepared using a sol gel method. The N 2 adsorption/desorption curves, scanning electron microscopy and zeta potential were used for characterization of MW-g-C. The adsorption characteristics of MW-g-C were studied using Basic Blue 41 (BB41) dye as an adsorbate. The effects of several influential parameters such as contact time, pH, adsorbent dose and initial concentration on the adsorption were well investigated and optimized. The maximum amount of dye adsorbed in optimal conditions (include pH= 6.8, amount of MW-g-C= 1.37 g L -1) was 115 mg g -1 . The linear correlation coefficients and the standard deviations of Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin isotherms were determined. The results also showed that the adsorption kinetics was controlled by a pseudo second-order model for adsorption of dye onto MW-g-C. The ∆G°, ∆H° and E a values indicated that the adsorption of BB41 onto MW-g-C was physisorption.
Introduction: Today, contamination of surface and underground water sources with textile dyes is one of the most serious environmental problems facing humans. Nanocomposites are a new generation of superabsorbents that have been proposed by many researchers as a promising strategy to reduce water pollution. In this study, a ceramic carbon nanocomposite containing multi-wall carbon nanotubes was synthesized and used as an adsorbent for removal of anionic acid red 37 from aqueous.
Methods: This experimental study was carried out at the laboratory level. The statistical population included synthetic aqueous solutions of acidic red dye 37 containing different amounts of synthesized nanocomposite. In absorption experiments, the effect of different factors such as pH, contact time, initial concentration of the dye, and the amount of ceramic carbon nanocomposite on the color absorption from solution was investigated. The adsorption conditions were optimized by response surface method. In addition, we investigated the dye absorption on ceramic carbon adsorbent based on Langmuir and Freundlich models.
Results: The optimal conditions were obtained at pH =4.2, contact time = 90 min, initial concentration of 24 mg / L, and 1.6g of ceramic carbon nanocomposite. In this condition, the maximum absorption efficiency of 97 percent was obtained. The maximum absorption capacity of the proposed nanocomposite was determined as 45.6 mg / g, which is comparable to similar carbon absorptions.
Conclusion: Based on the results, we found that the best model for justifying the dye absorption behavior on composite is the Freundlich model and the pseudo-second order equation can be used to study the kinetic behavior of AR37 absorption.
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