Development of hybrid adsorbent for effective aqueous phase sorptive removal of copper

Rahul Kumar, Sun Joon Kim, Kang Ho Kim, Mayur B. Kurade, Sang Hun Lee, Sang Eun Oh, Hyun Seog Roh, Byong Hun Jeon

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1 Citation (Scopus)

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 (R2 > 0.99), and the monolayer nature of sorption was supported by the Langmuir model (R2 > 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.

Original languageEnglish
Pages (from-to)480-487
Number of pages8
JournalSurface and Interface Analysis
Volume50
Issue number4
DOIs
Publication statusPublished - 2018 Apr

Bibliographical note

Funding Information:
This research was supported by the National Strategic Project‐Carbon Upcycling (2017M3D8A2085333, 2017M3D8A2085336) of the National Research Foundation (NRF) of Korea and a grant (16‐09‐03‐ 02‐06) from the Ansan Green Environment Center (AGEC) funded by the Ministry of Environment.

Publisher Copyright:
Copyright © 2018 John Wiley & Sons, Ltd.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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