Abstract
Adsorption has been one of the most preferred methods for the removal of dyes from aqueous solutions due to its simplicity and economic advantages. In this research, activated carbon prepared from orange peels has been characterized using Boehm titration which revealed the surface as having 7.70 mmol/g and 3.64 mmol/g total acidic and basic sites respectively. Scanning Electron Microscope (SEM) imaging showed that the adsorbent had heterogeneous surface morphology while the pH of zero point charge (pHzpc) of the adsorbent was found to be 3.6. Furthermore, Sear’s titration has shown that the activated carbon specific surface area was 791.1 m2 g - . 1The influence of various experimental parameters have been probed and optimized. The optimized conditions were set for the study of adsorption equilibrium and the experimental data were treated using Langmuir, Freundlich, Dubnin-Radushkevic (D-R) and Halsey isotherm models. However, all the four isotherm models were in good fit with the data obtained as indicated by the regression coefficients (R2 value) of 0.944 for the Langmuir isotherm, 0.993 for both Freundlich and Halsey models, and 0.980 for D-R model. The maximum monolayer coverage capacity (qm) was determined to be 11.5 mg/g at room temperature, which is higher than some presented in the previous literature.Keywords: Adsorption, Alizarin red, Orange peels, Textile dyes, Waste water, Adsorption isotherm
Highlights
Adsorption has been one of the most preferred methods for the removal of dyes from aqueous solutions due to its simplicity and economic advantages
The objective of this paper is to investigate the equilibrium studies on batch adsorption of alizarin red in aqueous solution using activated carbons derived from orange peels
Study Area and Sample collection: The study area was Katsina urban which is located at the extreme margin of northern Nigeria that lies on geographic coordinates of 11008’N and 13022’N and longitudes 6052’E and 90 20’E
Summary
Adsorption has been one of the most preferred methods for the removal of dyes from aqueous solutions due to its simplicity and economic advantages. The optimized conditions were set for the study of adsorption equilibrium and the experimental data were treated using Langmuir, Freundlich, Dubnin-Radushkevic (D-R) and Halsey isotherm models. The conventional methods for treating dye containing wastewaters are electrochemical treatment, coagulation and flocculation, chemical oxidation, liquid–liquid extraction and adsorption (Wang et al, 2005). Even when some these techniques were reported to be successful in decolorizing a particular wastewater, adsorption has been proven to be very effective separation technique and it is often considered to be superior to other techniques for water treatment in terms of initial cost, simplicity of design, ease of operation and insensitiveness to toxic substances (Parimaladevi and Venkateswaran, 2011). The objective of this paper is to investigate the equilibrium studies on batch adsorption of alizarin red in aqueous solution using activated carbons derived from orange peels
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