Development of hybrid adsorbent for effective aqueous phase sorptive removal of copper. (2nd March 2018)

• Record Type: Journal Article
• Authors: Kumar, Rahul; Kim, Sun‐Joon; Kim, Kang‐Ho; Kurade, Mayur B.; Lee, Sang‐hun; Oh, Sang‐Eun; Roh, Hyun‐Seog; Jeon, Byong‐Hun
• Is Part Of: Surface and interface analysis. Volume 50:Number 4(2018)
• Page Start: 480
• Page End: 487
• Publication Date: 2018-03-02
• Subjects: ion exchange -- isotherm models -- kinetics -- sorption -- X‐ray photoelectron spectroscopy -- zirconium oxide; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Thin films -- Periodicals; 541.33
• DOI: 10.1002/sia.6399
• Languages: English
• ISSNs: 0142-2421

Abstract

Abstract : Alginate beads (ABs) immobilized with hydrous zirconium oxide (ZO) were used as a hybrid adsorbent (ZO@AB) for the effective removal of copper ions [Cu(II)] from aqueous phase. ZO@AB was characterized using X‐ray photoelectron spectroscopy to confirm the impregnation of ABs with ZO and the adsorption of Cu(II) onto ZO@AB. The maximum equilibrium sorption capacity of ZO@AB for Cu(II) was 63.1 mg·g −1 at pH 5. The Cu(II) removal rate was high at the beginning of reaction, with >90% adsorption within 24 hours, and equilibrium was achieved within 48 hours. The adsorption of Cu(II) onto ZO@AB was well described by pseudo‐second‐order kinetic model (R 2 > 0.99), and the monolayer nature of sorption was supported by the Langmuir model (R 2 > 0.99). The sorption process was endothermic, favorable, and spontaneous in nature. Regarding the reusability of the adsorbent, its sorption capacity remained satisfactory (>90%) throughout the 5 consecutive cycles (regeneration in 0.1 mol·L −1 HCl). The stoichiometric ratio of released calcium ions [Ca(II)] to adsorbed copper ions [Cu(II)] was approximately 1:1, confirming that ion exchange was the main mechanism for removal of Cu(II) from aqueous phase. The developed adsorbent (ZO@AB) shows promise as a candidate for the effective and selective removal of Cu(II) from aqueous phase.