Efficient removal of Cu(II) with graphene oxide-titanium dioxide/sodium alginate composite beads: Preparation, characterization, and adsorption mechanism. Issue 6 (December 2021)

• Record Type: Journal Article
• Authors: Ma, Dan; E, Tao; Yang, Shuyi
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 6(2021)
• Publication Date: 2021-12
• Subjects: Cu(II) -- Graphene oxide -- Sodium alginate -- Adsorption -- Titanium dioxide; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106501
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Graphene oxide-titanium dioxide/sodium alginate (GO-TiO2 /SA) composite beads are successfully prepared based on blending and cross-linking process, performing as adsorbent to remove Cu(II) in aqueous solution. Meanwhile, the cross-linking mechanism are explored and the morphology of the GO-TiO2 /SA composite beads are characterized via FTIR, SEM, EDS, Raman and XPS. These results reveal that the porous network is created, corresponding to form hydrogen bonds, COTi among TiO2, GO and SA, as well as the cross-linking between carboxyl and Ca 2+ . In comparison with GO/SA composite beads, GO-TiO2 /SA composite beads are endowed with a more integral porous structure and a larger specific surface area, observing from the characterizations of BET and SEM, confirming that better adsorption performance is achieved. Furthermore, the adsorption experiments of Cu(II) are carried out in terms of varying the dosage of the composite beads, temperature, pH and adsorption time. And the adsorption behavior can be better described by the pseudo-second-order kinetic model and Langmuir model. Importantly, GO-TiO2 /SA composite beads maintain the undamaged structure and larger pore sizes when undergoing adsorption-desorption for two cycles. Finally, the adsorption mechanism on Cu(II) with GO-TiO2 /SA composite beads is also explored via FTIR, EDS and XPS. Graphical Abstract: Schematic of the synthesis of GO-TiO2 /SA composite beads. ga1 Highlights: GO-TiO2 /SA composite bead was successfully prepared by blending and cross-linking. Thermal stability and specific surface area of composite bead were greatly improved. Synthesized composite beads maintain an integral porous structure after two cycles. Cu 2+ was adsorbed by COO −, OH and electrostatic interaction.