NDLI: Kinetic, equilibrium isotherm and thermodynamic analysis for adsorption of Cr(VI) and Pb using powdered ground nut shell as a low-cost adsorbent

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Kinetic, equilibrium isotherm and thermodynamic analysis for adsorption of Cr(VI) and Pb using powdered ground nut shell as a low-cost adsorbent

Content Provider	Semantic Scholar
Author	Sharma, Dp Chaudhari, Pramesh Kumar Prajapati, Abhinesh Kumar
Copyright Year	2019
Abstract	Agricultural waste peanut shell was used as precursor for activated carbon production by chemical activation. The activated carbon was prepared by carbonization of nut shell in a conventional electric furnace by a two-stage carbonization process under optimized conditions. The prepared carbons were characterized for proximate and ultimate analysis and thermodynamic characteristics. It was used for the removal of Cr(VI) and Pb contained in metal plating effluent by adsorption process. Experiments were performed in batch mode to find the effects of pH, contact time, particle size, adsorbent dose, initial concentration of adsorbate, and temperature. Cr(VI) and Pb adsorption was strongly depended on solution pH, and the optimum adsorption was found at pH 3.5. The maximum Cr(VI) removal of 94.4% (initial Cr(VI) = 55.3 mg/L) and Pb removal of 96.1% (initial Pb = 3.5 mg/L) were achieved at operating condition pH = 3, T = 25°C and adsorbent dose = 5 g/L. The kinetic data were evaluated at different initial concentrations of Cr(VI) and Pb using pseudo-first-order, pseudosecond-order, and intraparticle diffusion models. Among these, the pseudo-second-order model fitted well. Langmuir, Freundlich, and Temkin isotherms were also tested for equilibrium studies, in which Langmuir adsorption isotherm model fitted the data better. The thermodynamic parameters, such as standard enthalpy change (ΔH°), Gibb's free energy change (ΔG°), and standard entropy change (ΔS°) were also evaluated.
Starting Page	239
Ending Page	251
Page Count	13
File Format	PDF HTM / HTML
DOI	10.5004/dwt.2019.24337
Volume Number	162
Alternate Webpage(s)	http://www.deswater.com/DWT_articles/vol_162_papers/162_2019_239.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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