Commenced in January 2007
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Edition: International
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Sorption of Charged Organic Dyes from Anionic Hydrogels

Authors: Georgios Linardatos, Miltiadis Zamparas, Vlasoula Bekiari, Georgios Bokias, Georgios Hotos

Abstract:

Hydrogels are three-dimensional, hydrophilic, polymeric networks composed of homopolymers or copolymers and are insoluble in water due to the presence of chemical or physical cross-links. When hydrogels come in contact with aqueous solutions, they can effectively sorb and retain the dissolved substances, depending on the nature of the monomeric units comprising the hydrogel. For this reason, hydrogels have been proposed in several studies as water purification agents. At the present work anionic hydrogels bearing negatively charged –COO- groups were prepared and investigated. These gels are based on sodium acrylate (ANa), either homopolymerized (poly(sodiumacrylate), PANa) or copolymerized (P(DMAM-co-ANa)) with N,N Dimethylacrylamide (DMAM). The hydrogels were used to extract some model organic dyes from water. It is found that cationic dyes are strongly sorbed and retained by the hydrogels, while sorption of anionic dyes was negligible. In all cases it was found that both maximum sorption capacity and equilibrium binding constant varied from one dye to the other depending on the chemical structure of the dye, the presence of functional chemical groups and the hydrophobic-hydrophilic balance. Finally, the nonionic hydrogel of the homopolymer poly(N,Ndimethylacrylamide), PDMAM, was also used for reasons of comparison.

Keywords: Anionic organic hydrogels, sorption, organic dyes, water purification agents.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1109653

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References:


[1] G. Crini, “Non-Conventional Low-Cost Adsorbents for Dye Removal: A Review” Bioresource Technol., vol. 97, pp. 1061-1085, June 2006.
[2] G. S. Chauhan, B. Singh, R.K. Sharma, M. Verma, S.C. Jaswal and R. Sharma, “Use of biopolymers and acrylamide-based hydrogels for sorption of Cu2+, Fe2+ and Cr6+ ions from their aqueous solutions”, Desalination, vol 197, pp 75-81, October 2006.
[3] X. Wang, Y.Guo, L. Yang, M. Han, J. Zhao and X. Cheng, “Nanomaterials as Sorbents to Remove Heavy Metal Ions in Wastewater Treatment” J. Environ. Anal. Toxicol., 2:154, November 2012.
[4] F. Zhaoa, W. Z. Tang, D. Zhao, Y. Menga, D. Yina and M. Sillanpaa, “Adsorption kinetics, isotherms and mechanisms of Cd(II), Pb(II), Co(II) and Ni(II) by a modified magnetic polyacrylamide microcomposite adsorbent”, Journal of Water Process Engineering, vol. 4, pp. 47-57 December 2014.
[5] O. Hernandez-Ramirez and S. M. Holmes, “Novel and modified materials for waste water treatment applications” J. Mater. Chem., vol. 18, pp. 2751-2761, February 2008.
[6] V Bekiari and P.Lianos, “Ureasil Gels as Highly Efficient Adsorbent for Water Purification”, Chem. Mater., vol. 18, pp. 4142-4146, July 2006.
[7] M. Nieto-Suarez, G. Palisano, M.L. Ferrer, M. Conception Gutierrez, S. Yurdakai, V. Augugliaro, M. Pagliaro and F. Del Monte, “Selfassembled titania-silica-sepioloite based nanocomposites for water decontamination” J. Mater. Chem., vol. 19, pp. 2070-2075, May 2009.
[8] I. Thivaios and G. Bokias, “Adsorption of Nile Red by poly(Nisopropylacrylamide) gels in binary water/tetrahydrofuran mixtures”, J. Appl. Polym. Sci., vol. 116, pp.1509-1514, May 2010.
[9] C. Zaharia and D Suteu, “Textile Organic Dyes –Characteristics, Polluting Effects and Separation/Elimination Procedures from Industrial Effluents – A Critical Overview”, book: ‘Organic Pollutants Ten Years After Stockholm Convention-Environmental and Analytical Update’, February 2012.
[10] V Vaino, O. Sacco, D. Sannino and P.Ciambelli, “Nanostructured Ndoped TiO2 coated on glass spheres for the photocatalytic removal of organic dyes under UV or visible light irradiation”, App. Catal.B, vol. 170-171, pp 153-161, July 2015.
[11] C. Umpuch and B. Jutarat, “Adsorption of Organic Dyes from Aqueous Solution by Surfactant Modified Corn Straw” International Journal of Chemical Engineering and Applications, vol. 4, pp. 134-139, June 2013.
[12] S. Ray, A.K. Das and A. Banerjee, “pH-responsive, bolaamphiphilebased smart metallo-hydrogels as potential dye-adsorbing agents, water purifier, and vitamin B12 carrier”, Chem. Mater., vol. 19, pp. 1633-1639, April 2007.
[13] E. Stathatos, P. Lianos and C. Tsakiroglou, “Metachromatic Effects and Photodegradation of Bacic Blue on Nanocrystalline Titania Films” Langmuir, vol. 20, pp. 9103-9107, September 2004.
[14] N. Strataki, V. Bekiari, E. Stathatos and P. Lianos, “Metachromatic Effects and Photodegradation of Bacic Blue on Nanocrystalline Titania Films” J. Photochem. Photobiol., A, vol. 191, 13-17, September 2007.
[15] V. Bekiari and P. Lianos, “Poly(sodiumacrylate) hydrogels as potential pH-sensitive sorbents for the removal of model organic and inorganic pollutants from water”, Global Nest Journal, vol. 12, pp. 262-269, August 2010.
[16] Y. Xun, Z. Shu-Ping, X. Wei, C. Hong-You, D. Xiao-Dong, L. Xin-Mei, Y. Zi-Feng, “Aqueous dye adsorption on ordered mesoporous carbons” J. Coloid Interf. Sci., vol.310, pp.83-89, June 2007.