Thermodynamic and Equilibrium Studies of Dextrin Adsorption on Modified Coal

Nkechi, Okoji Josephine; Okolie, Justus Ifeanyi; Okorocha, Nnaemeka John

doi:10.18052/www.scipress.com/ILCPA.69.22

ILCPA > ILCPA Volume 69 > Thermodynamic and Equilibrium Studies of Dextrin...

< Back to Volume

Thermodynamic and Equilibrium Studies of Dextrin Adsorption on Modified Coal

Full Text PDF

Abstract:

Dextrin produced from cassava was investigated for adsorption on coal during processing. Aluminium ion (Al³⁺) and nitrate ion (NO₃^-) were employed for adsorption test to improve coal surfaces. The effect of initial concentration, adsorbent dose and pH on dextrin adsorption onto modified coal surface was investigated. Studies concerning the adsorption equilibrium and thermodynamics are presented; the equilibrium data was modelled using Langmuir and Freundlich isotherms. The adsorption equilibrium data was well explained by Freundlich isotherm. The percentage removal was found to be 93.75% and 90.75% at adsorbent dose of 0.2 g for both aluminium sulphate coal bituminous (ACB) and aluminium sulphate coal lignite (ACL) respectively. There was a rapid increase in adsorption of dextrin from low pH of 2 to about pH of 4 with a plateau region from pH 4 to pH 6. Adsorption capacity of 61.25 mg/g and 55.00 mg/g was achieved at initial concentration of 200 mg/L for ACB and ACL respectively. For a better interpretation, the nature of the adsorption of dextrin on the prepared coal samples was predicted from thermodynamic point of view by estimating the thermodynamic parameters. The determination of basic thermodynamic parameters: enthalpy of adsorption, Gibb’s free energy and entropy of adsorption are important. The negative value of ∆G_ad indicates the feasibility and spontaneity of the adsorption process and the magnitude is an indication of the involvement of salt link, electrostatic interaction and hydrophobic bonding in the adsorption.

Info:

Periodical:

International Letters of Chemistry, Physics and Astronomy (Volume 69)

Pages:

22-33

DOI:

https://doi.org/10.18052/www.scipress.com/ILCPA.69.22

Citation:

O. J. Nkechi et al., "Thermodynamic and Equilibrium Studies of Dextrin Adsorption on Modified Coal", International Letters of Chemistry, Physics and Astronomy, Vol. 69, pp. 22-33, 2016

Online since:

August 2016

Authors:

Okoji Josephine Nkechi, Justus Ifeanyi Okolie, Nnaemeka John Okorocha

Keywords:

Coal, Dextrin, Equilibrium, Isotherm, Thermodynamic

Export:

RIS, BibTeX, Text

Distribution:

Open Access

This work is licensed under a
Creative Commons Attribution 4.0 International License

References:

[1] E.O. Oyelude, Comparative study of the adsorption of Maize starch and Cassava starch onto Heamatite, J. App. Tech. in Envi. Sanitation. 3 (2011) 335-241.

[2] J.S. Laskowski, Q. Liu, N.J. Bolin, Polysaccharides in Flotation of Sulphides. Part I. Adsorption of Polysaccharides onto Mineral Surfaces, Int. Journal of Min. Proc. 33 (1991) 223-234.

DOI: https://doi.org/10.1016/0301-7516(91)90054-m

[3] O.I. Liu, The Role of mineral surface composition and hydrophobicity in mineral interactions, Ph.D. Thesis, U. of British Columb, (1988).

[4] Q. Liu, J.S. Laskowski, The Interaction between Dextrin and Metal Hydroxides in Aqueous Solutions, Journal of Colloid Interface Sci. 130 (1989) 101-111.

DOI: https://doi.org/10.1016/0021-9797(89)90081-7

[5] Q. Liu, J.S. Laskowski, The Role of Metal Hydroxides at Mineral Surfaces in Dextrin Adsorption Studies on Modified Quartz Samples, Int. Journal of Min Proc. 26 (1989) 29-316.

DOI: https://doi.org/10.1016/0301-7516(89)90035-5

[6] Q. Liu,Y. Zhang, J.S. Laskowski, The adsorption of polysaccharides onto mineral surfaces: an acid/base interaction, International Journal of Mineral Processing. 60(3) (2000) 229-245.

DOI: https://doi.org/10.1016/s0301-7516(00)00018-1

[7] O.S. Azeez, Production of dextrin from cassava starch, B. Sc. Thesis, Department of Chemical Engineering, Federal University of Technology Minna, Niger State, (2002).

[8] A. Adeboye, Production of Adhesive from Cassava starch, B. Sc. Thesis, Department of Chemical Engineering, Federal University of Technology Minna, Niger State, (2003).

[9] D.W. Fuerstenau, J.M. Rosenbaum, J. Laskowski, Effect of surface functional groups on the flotation of coal, Colloids and Surfaces. 8(2) (1983) 153-173.

DOI: https://doi.org/10.1016/0166-6622(83)80082-1

[10] R.R. Dash, C. Ba lomajumder, A. Kumar, Removal of cyanide from water and wastewater using granular activated carbon, Chemical Engineering Journal, 146 (2009) 408-413.

DOI: https://doi.org/10.1016/j.cej.2008.06.021

[11] S.V. Mohan, J. Karthikeyan, Removal of lignin and tannin aqueous solution by adsorption onto activated charcoal, Environmental Pollution. 97 (1997) 183-197.

DOI: https://doi.org/10.1016/s0269-7491(97)00025-0

[12] U. Garg, M.P. Kaur, G.K. Jawa, D. Sud, V.K. Garg, Removal of cadmium(II) from aqueous solutions by adsorption on agricultural waste biomass, Journal of hazardous materials. 154 (2008) 1149–1157.

DOI: https://doi.org/10.1016/j.jhazmat.2007.11.040

[13] C.I.A. Nwoko, J.N. Okoji, A. A Ayuk, Adsorption Properties of Dextrin onto Modified Coal Surface, International Journal on Recent and Innovation Trends in Computing and Communication. 4 (2016) 516-522.

[14] H. Deveci, E.Y. Yazıcı, I. Alp, T. Uslu, Removal of cyanide from aqueous solutions by plain and metal-impregnated granular activated carbons, International Journal of Mineral Processing. 79 (2006) 198–208.

DOI: https://doi.org/10.1016/j.minpro.2006.03.002

[15] S.J. Allen, Q. Gan, R. Matthews, P.A. Johnson, Comparison of optimized isotherm models for basic dye adsorption by kudzu, Bio-resource Technology. 8 (2003) 143- 152.

DOI: https://doi.org/10.1016/s0960-8524(02)00281-x

[16] M.M. Dubinin, L.V. Radushkevich, The equation of the characteristic curve of activated charcoal modified activated carbons, Journal of Colloid and Interface Science. 302 (2006) 408-416.

[17] Z. Aksu, T. Kutsal, A bio-separation process for removing lead(II) ions from waste water by using C. vulgaris, Journal of Chemical Technology and Biotechnology. 52 (1991) 109-118.

DOI: https://doi.org/10.1002/jctb.280520108

[18] A. Akgerman, M. Zardkoohi, Adsorption of phenolic compounds on fly Ash, Journal of Chemical and Engineering Data. 41 (1996) 185-187.

DOI: https://doi.org/10.1021/je9502253

[19] W.T. Tan, S.T. Ool, C.R. Lee, Removal of chromium (VI) from solution by coconut husk and palm processed fibres, Environmental Technology. 14 (1993) 277-282.

DOI: https://doi.org/10.1080/09593339309385290

[20] Z. Zhang, L. Moghaddam, O. Hara, W.O.S. Doherty, Congo red adsorption by ball-milled sugarcane bags, Journal of Chem. Eng. 178 (2011) 122-128.

DOI: https://doi.org/10.1016/j.cej.2011.10.024

[21] S. Dwivedi et al., Screening of native plants and algae growing on fly-ash affected area near National Thermal Power Coperation, Tanda, Uttar Pradesh, India for accumulation of toxic heavy metal, Journal of hazardous material. 158 (2008) 359-365.

DOI: https://doi.org/10.1016/j.jhazmat.2008.01.081

[22] P. Bell, BP Statistical Review of world energy, BP London, (2002).

Show More Hide

Cited By:

This article has no citations.