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- Title
Adsorption Studies of Sodium Ions from Aqueous Solution with Natural and Sulfuric Acid-Treated Bean Seed Husk.
- Authors
Musie, Wondimu; Gonfa, Girma; Prabhu, S. Venkatesa
- Abstract
In this work, raw bean seed husk (RBH) and sulfuric acid-treated bean seed husk were examined for adsorption of sodium ions from water. Treated bean seed husk at various time and acid concentration was refined by performance test on sodium removal by using salt solution of 1643 mg/L and solid to liquid ratio of 12.5 (g:L). Maximum removal of 27.8% was achieved at 4 M and 6-h treatment conditions. Both the RBH and the material which showed the maximum removal (TBH) were characterized by scanning electron microscope, Fourier-transform infrared spectroscope (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller, and points of zero charge (pHpzc) for physico-chemical properties study. SEM, XRD, and FTIR analyses showed changes in the morphology, crystallography, and functional group of the husk on acid treatments. BET result found for RBH (0.67 m2/g) and TBH (0.44 m2/g) showed low specific surface area. The pHpzc values obtained for RBH and TBH were 6.3 and 2.6, respectively. Optimum sodium ion removal of 20.7% (on RBH) and 17.23% (on TBH) were obtained at adsorption time (3 h), pH (10.0), initial sodium concentration (3486 mg/L), and adsorbent dosage (0.5 g). Experimental data were fitted to isothermal and kinetic models. The result showed best fit with the Langmuir isothermal model with RL value in the favorable range for all initial concentrations and correlation coefficients, R2 of 0.985 for RBH and 0.963 for TBH. And the kinetics data showed best fit to pseudo-second-order with R2 of 0.999 for both RBH and TBH. The overall results therefore show that bean seed husk may be used for removal of sodium ions from water.
- Subjects
SODIUM ions; POINTS of zero charge; SOLUTION (Chemistry); BEANS; AQUEOUS solutions; ADSORPTION (Chemistry)
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06189-9