Abstract
Vigna unguiculata seed husk powder has been investigated as low cost adsorbent for the removal of hazardous chemicals like Congo Red (CR) dye from aqueous solution. Various parameters such as effect of contact time, initial CR dye concentration, adsorbent dose, effect of pH, zero-point pH were studied. Batch adsorption technique was employed to optimize the process parameter. The result indicated that, the percentage adsorption of Congo Red increased with increase in contact time, dose of adsorbent and initial concentration of Congo Red and decreased with addition of salt. The adsorption of Congo Red was 78% at the optimum pH of 6. Adsorption equilibrium was found to be reached in 24 h for 5 to 25 g/50 mL Congo red concentrations. The Langmuir and Freundlich isotherm models were found to provide an excellent fitting of the adsorption data. The adsorption of CR follows Second order rate kinetics. Thermodynamic parameter (δG o ) showed that it was an exothermic process. This adsorbent was found to be effective and economically attractive. DOI: http://dx.doi.org/10.17807/orbital.v8i5.834
Highlights
The potable water used by every human being for cooking as well as drinking should be uncontaminated and pure
Where, Co is the initial dye concentration, Ct is the concentration of Congo Red (CR) dye at time t, V is the volume of solution and M is the mass of husk (g)
The time-dependent behavior of CR dye adsorption was examined by varying the contact time between adsorbent and adsorbate in the range of 5 to 35 min
Summary
The potable water used by every human being for cooking as well as drinking should be uncontaminated and pure. A huge amount of water is necessary by these industries for the cleaning and washing purposes and the discharge highly coloured effluents containing various dyes. We have already reported the adsorptive capacity of some low cost materials towards metals and dyes earler [3,4,5,6,7] Literature survey reveals that various adsorbents have been tested and used for the removal of dyes from polluted water. In the present work Vigna unguiculata crop seed husk powder was employed for removal of hazardous CR dye and used as an effective adsorbent in the wastewater treatment. The adsorption technique was found to be very useful and cost effective for a better removal of hazardous CR dye
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