Preparation and evaluation of hydrogel composites based on starch-g-PNaMA/eggshell particles as dye biosorbent. Issue 39 (20th August 2016)

• Record Type: Journal Article
• Authors: Bakhshi, Hadi; Darvishi, Atefeh
• Is Part Of: Desalination and water treatment. Volume 57:Issue 39(2016)
• Page Start: 18144
• Page End: 18156
• Publication Date: 2016-08-20
• Subjects: Starch -- Poly(sodium methacrylate) -- Eggshell particles -- Hydrogel composite -- Dye biosorbent, adsorption kinetics; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1087344
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: In this study, eggshell (ES) particles as an available and low-cost waste material were used for preparing hydrogel composites as dye biosorbents. For this purpose, hydrogel composites were prepared through free-radical graft copolymerization of wheat starch and sodium methacrylate (NaMA) in the presence of different contents of ES particles with various size ranges. FTIR spectroscopy confirmed graft copolymerization of NaMA moieties onto starch backbone besides the combination of ES particles with the starch- g -PNaMA matrix. The gel content values were high (>99%), which showed proper graft efficiency for hydrogel composites. Incorporation of ES particles into hydrogel matrix resulted in faster water absorption at initial stage and lower equilibrium water absorption capacity. Addition of 60% ES particles into starch- g -PNaMA provided a cost-effective adsorbent with similar CV adsorption capacity compared to unfilled hydrogel, while MB removal was slightly decreased. The dye adsorption by hydrogel composites followed the pseudo-second-order kinetics, indicating that chemical sorption is the rate-limiting step.