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Poly(acrylamide) functionalized chitosan: an efficient adsorbent for azo dyes from aqueous solutions.
J Hazard Mater. 2009 Jul 15; 166(1):327-35.JH

Abstract

In the present communication we report on the optimization of persulfate/ascorbic acid initiated synthesis of chitosan-graft-poly(acrylamide) (Ch-g-PAM) and its application in the removal of azo dyes. The optimum yield of the copolymer was obtained using 16 x 10(-2)M acrylamide, 3.0 x 10(-2)M ascorbic acid, 2.4 x 10(-3)M K(2)S(2)O(8) and 0.1g chitosan in 25 mL of 5% aqueous formic acid at 45+/-0.2 degrees C. Ch-g-PAM remained water insoluble even under highly acidic conditions and could efficiently remove Remazol violet and Procion yellow dyes from the aqueous solutions over a pH range of 3-8 in contrast to chitosan (Ch) which showed pH dependent adsorption. The adsorption data of the Ch-g-PAM and Ch for both the dyes were modeled by Langmuir and Freundlich isotherms where the data fitted better to Langmuir isotherms. To understand the adsorption behavior of Ch-g-PAM, adsorption of Remazol violet on to the copolymer was optimized and the kinetic and thermodynamic studies were carried out taking Ch as reference. Both Ch-g-PAM and Ch followed pseudo-second-order adsorption kinetics. The thermodynamic study revealed a positive heat of adsorption (Delta H degrees), a positive DeltaS degrees and a negative Delta G degrees, indicating spontaneous and endothermic nature of the adsorption of RV dye on to the Ch-g-PAM. The Ch-g-PAM was found to be very efficient in removing color from real industrial wastewater as well, though the interfering ions present in the wastewater slightly hindered its adsorption capacity. The data from regeneration efficiencies for ten cycles evidenced the high reusability of the copolymer in the treatment of waste water laden with even high concentrations of dye.

Authors+Show Affiliations

Department of Chemistry, University of Allahabad, Allahabad 211002, India. singhvandanasingh@rediffmail.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19097701

Citation

Singh, Vandana, et al. "Poly(acrylamide) Functionalized Chitosan: an Efficient Adsorbent for Azo Dyes From Aqueous Solutions." Journal of Hazardous Materials, vol. 166, no. 1, 2009, pp. 327-35.
Singh V, Sharma AK, Sanghi R. Poly(acrylamide) functionalized chitosan: an efficient adsorbent for azo dyes from aqueous solutions. J Hazard Mater. 2009;166(1):327-35.
Singh, V., Sharma, A. K., & Sanghi, R. (2009). Poly(acrylamide) functionalized chitosan: an efficient adsorbent for azo dyes from aqueous solutions. Journal of Hazardous Materials, 166(1), 327-35. https://doi.org/10.1016/j.jhazmat.2008.11.026
Singh V, Sharma AK, Sanghi R. Poly(acrylamide) Functionalized Chitosan: an Efficient Adsorbent for Azo Dyes From Aqueous Solutions. J Hazard Mater. 2009 Jul 15;166(1):327-35. PubMed PMID: 19097701.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Poly(acrylamide) functionalized chitosan: an efficient adsorbent for azo dyes from aqueous solutions. AU - Singh,Vandana, AU - Sharma,Ajit Kumar, AU - Sanghi,Rashmi, Y1 - 2008/11/18/ PY - 2008/06/17/received PY - 2008/11/10/revised PY - 2008/11/11/accepted PY - 2008/12/23/entrez PY - 2008/12/23/pubmed PY - 2009/8/8/medline SP - 327 EP - 35 JF - Journal of hazardous materials JO - J Hazard Mater VL - 166 IS - 1 N2 - In the present communication we report on the optimization of persulfate/ascorbic acid initiated synthesis of chitosan-graft-poly(acrylamide) (Ch-g-PAM) and its application in the removal of azo dyes. The optimum yield of the copolymer was obtained using 16 x 10(-2)M acrylamide, 3.0 x 10(-2)M ascorbic acid, 2.4 x 10(-3)M K(2)S(2)O(8) and 0.1g chitosan in 25 mL of 5% aqueous formic acid at 45+/-0.2 degrees C. Ch-g-PAM remained water insoluble even under highly acidic conditions and could efficiently remove Remazol violet and Procion yellow dyes from the aqueous solutions over a pH range of 3-8 in contrast to chitosan (Ch) which showed pH dependent adsorption. The adsorption data of the Ch-g-PAM and Ch for both the dyes were modeled by Langmuir and Freundlich isotherms where the data fitted better to Langmuir isotherms. To understand the adsorption behavior of Ch-g-PAM, adsorption of Remazol violet on to the copolymer was optimized and the kinetic and thermodynamic studies were carried out taking Ch as reference. Both Ch-g-PAM and Ch followed pseudo-second-order adsorption kinetics. The thermodynamic study revealed a positive heat of adsorption (Delta H degrees), a positive DeltaS degrees and a negative Delta G degrees, indicating spontaneous and endothermic nature of the adsorption of RV dye on to the Ch-g-PAM. The Ch-g-PAM was found to be very efficient in removing color from real industrial wastewater as well, though the interfering ions present in the wastewater slightly hindered its adsorption capacity. The data from regeneration efficiencies for ten cycles evidenced the high reusability of the copolymer in the treatment of waste water laden with even high concentrations of dye. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19097701/Poly_acrylamide__functionalized_chitosan:_an_efficient_adsorbent_for_azo_dyes_from_aqueous_solutions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(08)01695-6 DB - PRIME DP - Unbound Medicine ER -