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oa South African Journal of Chemistry - Adsorption of rhodamine B dye from aqueous solution on biomass : kinetics and thermodynamics studies : research article

 

Abstract

Raw (dika nut) (DN) and its acid-treated form(ADN) were used for the uptake of rhodamine B (RhB) dye from aqueous solution. The adsorbents were characterized by Fourier transform infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis and scanning electron microscopy (SEM). The adsorbents were found to have characteristic functional groups such as -OH, C-N and C=O. SEM revealed that acid treatment resulted in the development of several pore sizes. Sorption data fitted the Freundlich adsorption isotherm better than the Langmuir isotherm. The maximum sorption capacities, , obtained from the Langmuir adsorption isotherm were 212.77 and 232 mg g-1 for DN and ADN, respectively. The pseudo-second-order kinetics model was observed to fit the adsorption data. Solution pH and temperature significantly influenced the adsorption process and negative values of ∆G° suggest that the sorption process was spontaneous and feasible. Intraparticle diffusion mainly controlled the uptake of RhB onto DN and ADN; however, boundary layer diffusion also occurred in the RhB-ADN system. The desorption efficiency of RhB from the adsorbents was tested with a number of eluents. The eluents were found to follow the order: HO>CHCOOH>HCl and CHCOOH>HCl>HO for DN and ADN, respectively.

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/content/chem/68/1/EJC170808
2015-01-01
2016-12-06
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