Highly efficient absorption of cationic dyes by nano composite hydrogels based on κ-carrageenan and nano silver chloride

Maryam Dargahi; Hossein Ghasemzadeh; Atefeh Bakhtiary

doi:10.1016/j.carbpol.2017.11.108

Highly efficient absorption of cationic dyes by nano composite hydrogels based on κ-carrageenan and nano silver chloride

Carbohydr Polym. 2018 Feb 1:181:587-595. doi: 10.1016/j.carbpol.2017.11.108. Epub 2017 Nov 29.

Authors

Maryam Dargahi¹, Hossein Ghasemzadeh², Atefeh Bakhtiary²

Affiliations

¹ Department of Chemistry, Faculty of Science, Imam Khomeini International University, P.O. Box 288, Qazvin, Iran. Electronic address: dargahi@sci.ikiu.ac.ir.
² Department of Chemistry, Faculty of Science, Imam Khomeini International University, P.O. Box 288, Qazvin, Iran.

PMID: 29254011
DOI: 10.1016/j.carbpol.2017.11.108

Abstract

Novel nanocomposite hydrogel was synthesized based on κ-carrageenan and nano-silver chloride by a simple method and applied for the removal of cationic dyes in aqueous solution. Inclusion of nano-silver chloride into the superabsorbent hydrogel was utilized for producing the effective dye absorbent. The dye absorption was more than 98% after 5min in a 10ppm aqueous solution at pH=6. The nanocomposite hydrogel was characterized by FT-IR spectroscopy, SEM, TEM, TGA/DTG, and BET analysis. The absorption of crystal violet was investigated by changing the absorbent dosage, contact time, dye concentration, pH, and temperature. Several kinetic models were used to predict the kinetic behavior of the dye absorption. The best result was obtained with the pseudo-second order model. The results demonstrated that the Temkin model has been fitted better than the other models. The reusability experiments showed that the superabsorbent retained more than 60% of initial activity after 9 cycles.

Keywords: Dye absorption; Nano-silver chloride; Nanocomposite hydrogel.