Pectin Based Graft Copolymer–ZnO Hybrid Nanocomposite for the Adsorptive Removal of Crystal Violet

Journal Article · Sun Sep 01 04:00:00 EDT 2019 · Journal of Polymers and the Environment

DOI:https://doi.org/10.1007/S10924-019-01488-X· OSTI ID:22977064

Kodoth, Arun K.; Badalamoole, Vishalakshi ^[1]

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1. Mangalore University, Department of Post-Graduate Studies & Research in Chemistry (India)

In this work we report the comparative study of the dye adsorption behavior of a Pectin-based terpolymer gel, pectin-graft-(poly(2-acrylamido-2-methyl-1-propane sulfonic acid)-co-acrylamide) (Pec-g-poy(AMPS-co-AAm)) and its nanocomposite with ZnO, (Pec-g-poy(AMPS-co-AAm)/ZnO) from aqueous solutions. Both the hydrogel systems have been synthesized using microwave irradiation technique through free radical polymerization. Swelling behavior of the systems was studied in buffer solutions of pH ranging from 1.2 to 13 and maximum swelling was observed in neutral medium. The equilibrium swelling of parent gel was found to be 28.12 g/g whereas it was 16.54 in the case of nanocomposite. Cationic dye, crystal violet, is employed to assess the adsorption efficiency of the gel samples from aqueous solutions. The influence of initial dye concentration was investigated. A maximum adsorption of 329 and 568 mg/g has been observed for the parent gel and the nanocomposite respectively. The presence of ZnO is observed to enhance the adsorption capacity of Pec-g-poy(AMPS-co-AAm) gel considerably. The kinetic studies revealed a second order adsorption process with high rate of initial adsorption in the case of the nanocomposite when compared to the parent gel and the isotherm studies reveals that the adsorption process fits well into Langmuir model. The evaluation of thermodynamic parameters indicated the adsorption process to be exothermic and spontaneous. Desorption studies under acidic condition showed that almost 96% of the adsorbed dye molecules could be desorbed to the stripping solution of pH 1.2 which support the use of these hydrogel systems for the repeated use as adsorbents for cationic dyes.

• OSTI ID: 22977064
• Journal Information: Journal of Polymers and the Environment, Journal Name: Journal of Polymers and the Environment Journal Issue: 9 Vol. 27; ISSN 1566-2543
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACRYLAMIDE
AQUEOUS SOLUTIONS
COPOLYMERS
HYDROGELS
METHYL VIOLET
MICROWAVE RADIATION
NANOCOMPOSITES
NANOPARTICLES
PECTINS
POLYMERIZATION
PROPANE
SULFONIC ACIDS
ZINC OXIDES