An innovative approach to synthesize graft copolymerized acetylacetone chitosan/surface functionalized alginate/rutile for efficient Ni(II) uptake from aqueous medium

Khalilullah Abed; Ejaz Ahmed; Hamza Shehzad; Ahsan Sharif; Zahoor H Farooqi; Zhirong Liu; Limin Zhou; Jinbo Ouyang; Robina Begum; Ahmad Irfan; Aijaz Rasool Chaudhry; Muhammad Imran Din

doi:10.1016/j.ijbiomac.2023.125327

An innovative approach to synthesize graft copolymerized acetylacetone chitosan/surface functionalized alginate/rutile for efficient Ni(II) uptake from aqueous medium

Int J Biol Macromol. 2023 Jul 15:243:125327. doi: 10.1016/j.ijbiomac.2023.125327. Epub 2023 Jun 9.

Authors

Affiliations

¹ School of Chemistry, University of the Punjab, New Campus, Lahore 54590, Pakistan.
² School of Chemistry, University of the Punjab, New Campus, Lahore 54590, Pakistan. Electronic address: ejaz.ahmed.chem@pu.edu.pk.
³ School of Chemistry, University of the Punjab, New Campus, Lahore 54590, Pakistan; School of Chemistry and Materials Science, East China University of Technology, 418 Guanglan Road, 330013 Nanchang, China. Electronic address: hamzashehzad89@yahoo.com.
⁴ School of Chemistry and Materials Science, East China University of Technology, 418 Guanglan Road, 330013 Nanchang, China.
⁵ State Key Laboratory for Nuclear Resources and Environment, East China University of Technology, 418 Guanglan Road, 330013 Nanchang, China.
⁶ Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang 330013, China.
⁷ Department of Chemistry, College of Science, King Khalid University, Abha 61413, Saudi Arabia.
⁸ Department of Physics, College of Science, University of Bisha, Bisha 61922, P.O. Box 551, Saudi Arabia.

PMID: 37302624
DOI: 10.1016/j.ijbiomac.2023.125327

Abstract

In this study, an innovative approach is followed to synthesize graft copolymerized chitosan with acetylacetone (AA-g-CS) through free-radical induced grafting. Afterwards, AA-g-CS and rutile have been intercalated uniformly into amino carbamate alginate matrix to prepare its biocomposite hydrogel beads of improved mechanical strength having different mass ratio i.e., 5.0 %, 10.0 % 15.0 % and 20.0 % w/w. Biocomposites have been thoroughly characterized through FTIR, SEM and EDX analysis. Isothermal sorption data showed good fit with Freundlich model as conferred from regression coefficient (R² ≈ 0.99). Kinetic parameters were evaluated through non-linear (NL) fitting of different kinetic models. Experimental kinetic data exhibited close agreement to quasi-second order kinetic model (R² ≈ 0.99) which reveals that chelation between heterogeneous grafted ligands and Ni(II) is occurring through complexation. Thermodynamic parameters were evaluated at different temperatures to observe the sorption mechanism. The negative values of ΔG° (-22.94, -23.56, -24.35 and - 24.94 kJ/mol), positive ΔH° (11.87 kJ/mol) and ΔS° (0.12 kJ/molK^-1) values indicated that the removal process is spontaneous and endothermic. The maximum monolayer sorption capacity (q_m) was figured as 246.41 mg/g at 298 K and pH = 6.0. Hence, 3AA-g-CS/TiO₂ could be better candidate for economic recovery of Ni(II) ions from waste effluents.

Keywords: Alginate; Chemical modification; Chitosan; Free radical grafting; Ni (II) sorption.

MeSH terms

Adsorption
Alginates / chemistry
Chitosan* / chemistry
Hydrogen-Ion Concentration
Kinetics
Thermodynamics
Water
Water Pollutants, Chemical*

Substances

Chitosan
Alginates
titanium dioxide
acetylacetone
Water
Water Pollutants, Chemical