Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Abstract

A novel polysaccharide-based hydrogel nanocomposite was prepared using grafting of acrylic acid (AA) on to kappa-carrageenan (κC) by incorporating multi-walled carbon nanotube (MCNT). In fact, MCNTs were used as nano-sized reinforcements in the synthesized nanocomposite. Spectroscopy together with morphology proved relatively strong κC-MCNT interaction. Besides, the swelling behavior of the nanocomposite hydrogel was studied. The results showed that in the presence of MCNTs, the equilibrium swelling capacity was decreased. This can be attributed to cross-linking role and hydrophilicity nature of MCNTs. The adsorption performance of hydrogel nanocomposite was also investigated for the removal of crystal violet (CV) as a cationic dye. The effects of some important parameters such as MCNT concentration, pH and contact time on the uptake of CV solution were studied. Equilibrium adsorption isotherm data of the hydrogel exhibited better fi t to the Langmuir than to the Freundlich isotherm model. According to this model, the maximum adsorption capacity of κC-based hydrogel nanocomposite was found to be 118 mg . g -1.

Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

“…These values are comparable to other results reported in the reference literature, for CV sorption on other types of hydrogels: 49.0 mg/g (poly (acrylic acid) hydrogels) [81]; 105.2 mg/g (carrageenan/multi-walled carbon nanotube hybrid hydrogel) [82] and 16.3 mg/g (κ-carrageenan hydrogel beads) [83].…”

Seaweed based sustainable films and composites for food and pharmaceutical applications: A review

“…Recent advances in the field of seaweed-based composites enable their usage in food packaging and coating along with the development of new drug delivery system, biomedical scaffolds, and cell encapsulations. Hosseinzadeh [110] …”

Carrageenan Based Bionanocomposites as Drug Delivery Tool with Special Emphasis on the Influence of Ferromagnetic Nanoparticles

“…It was seen that the adsorption capacity of nanocomposites varies with multiwalled carbon nanotube (MCNTs) concentration and agitation time as well as the pH of solution. The maximum adsorption capacity of CG/MCNTs hybrid hydrogel nanocomposite was found to be 118 mg/g [ 83 ].…”