Abstract
In this study, the adsorption potential of bentonite for removal of Ni(II) ions from wastewater has been investigated. The study involves batch type experiments to investigate the effect of initial concentration, adsorbent dose, agitation speed, contact time, temperature and pH of the solution on adsorption process and the optimum conditions were evaluated. The adsorption process fits pseudo-second order kinetic models. Langmuir and Freundich adsorption isotherm models were applied to analyze adsorption data and both were found to be applicable to the adsorption process. Thermodynamic parameters, e.g., ∆Go, ∆So and ∆Ho of the on-going adsorption process have also been calculated and the sorption process was found to be endothermic. Finally, it can be seen that Bentonite was found to be more effective for the removal of Ni(II) at the same experimental conditions.
Highlights
Water contamination by heavy metals in industrial effluents is a serious environmental problem
The objectives of the present study are: 1) studying the effect of contact time on Ni+2 ions adsorption onto Bentonite; 2) to investigate the influence of PH on the adsorption of Ni+2 ions;3)to study the adsorption of Ni+2 ions at different temperatures and to calculate the adsorption thermodynamic parameters (i.e., ∆H0, ∆S0, ∆G0; 4) to find the effect of adsorbent dose and the initial concentration on the adsorption of Ni+2 ions;5)to describe the experimental data of adsorption isotherm through Langmuir and freundlich models; 6) to discuss the adsorption mechanism of Ni+2 ions onto both adsorbents
This paper demonstrated the efficiency in the removal of pollution agents such as Ni from effluents through an adsorption process
Summary
Water contamination by heavy metals in industrial effluents is a serious environmental problem This situation has led to development of research aiming at its reduction or elimination and at the appreciation of residues obtained through physical, chemical, thermal, biological or mixed treatments. Some nickel compounds, such as carbonyls, are carcinogenic and absorbed by skin The exposure to this compound at an atmospheric concentration of 30 ppm for half an hour is lethal [1]. The use of clay for sorptionor elimination of heavy metals in effluents has been conisderd as an object of study in a great deal of research due to its several economic advantages [2,3,4] The cost of these adsorbents is relatively low when it’s compared to other alternative adsorbents, including activated coal, natural and synthetic zeolites, ionexchange resins and other adsorbent materials. The objectives of the present study are: 1) studying the effect of contact time on Ni+2 ions adsorption onto Bentonite; 2) to investigate the influence of PH on the adsorption of Ni+2 ions;3)to study the adsorption of Ni+2 ions at different temperatures and to calculate the adsorption thermodynamic parameters (i.e., ∆H0, ∆S0, ∆G0; 4) to find the effect of adsorbent dose and the initial concentration on the adsorption of Ni+2 ions;5)to describe the experimental data of adsorption isotherm through Langmuir and freundlich models; 6) to discuss the adsorption mechanism of Ni+2 ions onto both adsorbents
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