Chitosan/PVA silver nanocomposite for butachlor removal: Fabrication, characterization, adsorption mechanism and isotherms

Ravneet Kaur; Dinesh Goyal; Shekhar Agnihotri

doi:10.1016/j.carbpol.2021.117906

Chitosan/PVA silver nanocomposite for butachlor removal: Fabrication, characterization, adsorption mechanism and isotherms

Carbohydr Polym. 2021 Jun 15:262:117906. doi: 10.1016/j.carbpol.2021.117906. Epub 2021 Mar 5.

Authors

Ravneet Kaur¹, Dinesh Goyal², Shekhar Agnihotri³

Affiliations

¹ Department of Biotechnology, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala, 147001, Punjab, India.
² Department of Biotechnology, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala, 147001, Punjab, India. Electronic address: dgoyal@thapar.edu.
³ Department of Biotechnology, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala, 147001, Punjab, India; Department of Agriculture and Environmental Sciences, National Institute of Food Technology Entrepreneurship and Management, Kundli, Sonepat, 131028, Haryana, India.

PMID: 33838794
DOI: 10.1016/j.carbpol.2021.117906

Abstract

Silver nanoparticle (AgNP) incorporated chitosan-Polyvinyl alcohol (Ch/PVA) hydrogel nanocomposite was fabricated by repeated freeze-thaw treatment using glutaraldehyde as crosslinker for removal of herbicide butachlor from aqueous solution. Ch/PVA hydrogel provided a matrix for in-situ immobilization of AgNPs and were characterized by various physicochemical techniques. AgNPs of size 5-20 nm possessed crystalline structure, led to increase in thermal stability and surface area after incorporation into Ch/PVA hydrogel. Ch/PVA hydrogel nanocomposite showed maximum adsorption of butachlor (86.55 %) at 30 °C and pH 3.0, while Ch/PVA-Ag showed a slight increase in adsorption of butachlor following pseudo-second order kinetics. Langmuir and Freundlich models with different error functions (R², R²_adj, RSME, χ² and RSS), confirmed monolayer adsorption of butachlor.

Keywords: Adsorption; Chitosan; Hydrogel; PVA; Silver nanocomposite.

MeSH terms

Acetanilides / isolation & purification*
Adsorption
Chitosan / chemistry*
Cross-Linking Reagents / chemistry
Glutaral / chemistry
Herbicides / isolation & purification
Humans
Kinetics
Metal Nanoparticles / chemistry*
Nanocomposites / chemistry*
Polyvinyl Alcohol / chemistry*
Silver / chemistry*
Spectroscopy, Fourier Transform Infrared / methods
Temperature

Substances

Acetanilides
Cross-Linking Reagents
Herbicides
polyvinyl alcohol hydrogel
Silver
Polyvinyl Alcohol
Chitosan
butachlor
Glutaral