Graphene Oxide/Polyvinyl Alcohol/Fe[sub.3]O[sub.4] Nanocomposite: An Efficient Adsorbent for Co Ion Removal

• Published in: Journal of analytical methods in chemistry 2021-03, Vol.2021
• Main Authors: Le, Thu Dieu, Tran, Luyen Thi, Dang, Hue Thi Minh, Tran, Thi Thu Huyen, Tran, Hoang Vinh
• Format: Article
• Language: English
• Subjects: Cobalt; Graphene; Graphite; Magnetite
• ISSN: 2090-8865
• DOI: 10.1155/2021/6670913

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co[sup.2+]) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe[sub.3]O[sub.4]) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe[sub.3]O[sub.4] nanocomposite was applied for Co[sup.2+] ion removal with the optimized working conditions including 100min of contact time, 0.01g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co[sup.2+] ion onto the GO/PVA/Fe[sub.3]O[sub.4] nanocomposite followed the pseudo-second-order kinetic model with the rate constant k[sub.2] being 0.0026 (g mg[sup.-1]·min[sup.-1]). The Langmuir model is suitable to describe the adsorption of Co[sup.2+] ion onto the GO/PVA/Fe[sub.3]O[sub.4] nanocomposite with the maximum sorption capacity (q[sub.max]) reaching 373.37mg·g[sup.-1]. The obtained results also indicated that the GO/PVA/Fe[sub.3]O[sub.4] nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe[sub.3]O[sub.4] nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.