Adsorption of Dyes from Aqueous Solutions on Activated Charcoal

Department of Chemistry, Quaid-i-Azam University, Islāmābād, Islāmābād, Pakistan
Journal of Hazardous Materials (Impact Factor: 4.53). 02/2007; 139(1):57-66. DOI: 10.1016/j.jhazmat.2006.06.007
Source: PubMed

ABSTRACT Adsorption of industrially important dyes namely bromophenol blue, alizarine red-S, methyl blue, methylene blue, eriochrome black-T, malachite green, phenol red and methyl violet from aqueous media on activated charcoal has been investigated. The effect of shaking time, pH and temperature on the adsorption behaviour of these dyes has been studied. It was noted that adsorption of all the dyes on activated charcoal decreases with an increase in the pH and the temperature. The adsorption isotherms at different temperatures were found to be of L-type. Adsorption data was fitted to Freundlich, BET and Langmuir isotherms and various adsorption parameters have been calculated. The thermodynamic parameters such as DeltaG, DeltaH and DeltaS were calculated from the slopes and intercepts of the linear variation of lnK against 1/T, where K is the adsorption coefficient obtained from Langmuir equation, was used. The calculated values for the heat of adsorption and the free energy indicate that adsorption of dyes is favored at low temperatures and the dyes are chemisorbed on activated charcoal.

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    Global Journal of Environmental Science and Management 01/2015; 1(1):71-94.
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    • "The authors note that correlation coefficients are highest for Ho's pseudo-second-order equation, which suggests that this model is best suited to predicting the kinetics of the MB adsorption onto MKP cokes. Assuming there is an exchange of electrons between MB molecules and adsorbent through covalent forces, the adsorption process can be described as chemisorption (Iqbal and Ashiq, 2006; Vadivelan and Kumar, 2005), although the thermodynamic studies strongly suggest that the adsorption process is physisorption. "
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    • "The cost effectiveness , availability and adsorptive properties are the main criteria in selection of an adsorbent to remove organic compounds from wastewaters (Demirbas et al., 2008; Ghaedi et al., 2012), also application of adsorption procedure especially based on non-toxic and green adsorbent with high surface area and reactive surface atom is a great demand (Chiou and Chuang, 2006). Activated carbon, a widely used adsorbent in industrial processes, is composed of a microporous, homogenous structure with high surface area and shows radiation stability (Iqbal and Ashiq, 2007). The process for producing high-efficiency activated carbon is not completely investigated in developing countries. "
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