Elaboration of chitosan/activated carbon composites for the removal of organic micropollutants from waters

Environmental Technology
A VenaultC Faur

Abstract

Composite hydrogels were prepared by a wet-casting process by blending a biopolymer, chitosan, with activated carbon (AC) for use in water treatment. Adsorption properties of the composite gels for an organic micro-pollutant (phenol) which may be encountered in wastewaters was studied with an experimental design approach as a function of: - the concentration of raw materials and thus the AC weight within the chitosan matrix. - the accessibility of AC in the polymeric matrix, which is assumed to be related to the coating and thus to the pH of the immersion bath. ESEM observations showed that at a higher pH of gelation (pH = 14), AC particles were entrapped at the surface of the polymer matrix because of a faster gelation kinetic than at a lower pH (13.3). Adsorption kinetic tests showed that phenol adsorption occurred according to two mechanisms. During the first step, phenol molecules were adsorbed by the AC particles located at the surface. The second step corresponded to a slow diffusion through chitosan chains leading to an adsorption by AC particles entrapped within the polymeric matrix coupled to an adsorption on to the chitosan. A mass transfer model was used to describe this two-step adsorption phenomenon. However, due t...Continue Reading

References

Feb 8, 2003·Journal of Hazardous Materials·Sandhya Babel, Tonni Agustiono Kurniawan
Aug 18, 2004·Journal of Colloid and Interface Science·Min-Yun Chang, Ruey-Shin Juang
Mar 15, 2005·Bioprocess and Biosystems Engineering·Lucila EnsunchoRaymond L Legge
May 10, 2005·Biomaterials·Chien-Yang HsiehHsyue-Jen Hsieh
Jul 5, 2005·Bioresource Technology·Grégorio Crini
May 11, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·S VinitnantharatY Ishibashi

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Citations

Sep 4, 2013·Journal of Colloid and Interface Science·Layaly ObeidMathias Welschbillig
Dec 22, 2015·Carbohydrate Polymers·Mohammadtaghi VakiliZahra Gholami
Jul 17, 2018·Environmental Science and Pollution Research International·Chanokporn MuangchindaOnruthai Pinyakong
May 8, 2018·Environmental Science and Pollution Research International·Seydou BaMohamed Hajjaji
Oct 18, 2020·International Journal of Biological Macromolecules·Mallesh Kurakula, Naveen Raghavendra N

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Methods Mentioned

BETA
acetylation
Size Exclusion Chromatography

Software Mentioned

Minitab®

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