Effective removal of Cu(II) from aqueous solution over graphene oxide encapsulated carboxymethylcellulose-alginate hydrogel microspheres: towards real wastewater treatment plants

• Published in: Environmental science and pollution research international Vol. 27; no. 7; pp. 7476 - 7492
• Main Authors: Allouss, Dalia, Essamlali, Younes, Chakir, Achraf, Khadhar, Samia, Zahouily, Mohamed
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-03-2020; Springer Nature B.V
• Subjects: Adsorption; Alginates; Alginic acid; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Beads; Carboxymethyl cellulose; Carboxymethylcellulose; Carboxymethylcellulose Sodium - chemistry; Cellulose; Copper; Copper - analysis; Copper - chemistry; Earth and Environmental Science; Ecotoxicology; Encapsulation; Environment; Environmental Chemistry; Environmental Health; Environmental science; Functional groups; Gelation; Graphene; Graphite - chemistry; Hydrogels; Hydrogels - chemistry; Kinetics; Metal ions; Microspheres; Research Article; Surface charge; Surface chemistry; Waste Water; Waste Water Technology; Wastewater treatment; Wastewater treatment plants; Water Management; Water Pollutants, Chemical; Water Pollution Control; Carboxymethyl cellulose; Cu(II) removal; Hydrogel beads; Graphene oxide; Sodium alginate; Adsorption
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-019-06950-w

In the current study, the graphene oxide (GO) encapsulated carboxymethyl cellulose-Alginate (CMC-Alg) hydrogel microspheres were prepared via ionotropic gelation method and characterized using FTIR, TGA, SEM-EDS and surface charge by determining pH
pzc
. The adsorption of Cu
2+
ions from aqueous solution on the graphene oxide embedded CMC-Alg was studied under different experimental conditions, and the results showed that embedded beads had high adsorption capacity compared with pure CMC-Alg beads due to synergetic effect between functional groups GO and CMC-Alg matrix. Adsorption capacities at equilibrium were calculated experimentally as 22.10, 39.96, 41.72 and 64 mg/g for pure CMC-Alg, CMC-Alg/GO 1%, CMC-Alg/GO 3% and CMC-Alg/GO 5%, respectively. The adsorption kinetics were found to follow the pseudo-second-order, and the equilibrium data fitted well with the Langmuir adsorption isotherm. Moreover, the intraparticle diffusion model has been inspected pointing that the adsorption process was found to be sequence of surface adsorption and intraparticle diffusion (IPD). The results suggest that graphene oxide embedded CMC-Alg bead matrix can be efficiently used as an adsorbent for metal ions removal from wastewater.