Original Article
  • Preparation of PVA/Graphene Oxide/Fe3O4 Magnetic Microgels as an Effective Adsorbent for Dye Removal

  • Seongmoon Go*, Keunseong Kim*, Eunsol Wi*, Rae-Su Park***, Hong-Ryun Jung****,
    Changhun Yun*,**†, Mincheol Chang*,**†

  • * Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, Korea
    ** School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, Korea
    *** Department of Chemical Engineering, Chosun University, Gwangju 61452, Korea
    **** Industry-University Cooperation Foundation, Chonnam National University, Gwangju 61186, Korea

  • 폴리바이닐알코올/그래핀 옥사이드/산화철 자성 마이크로겔을 이용한 염료 제거

  • 고성문* · 김근성* · 위은솔*· 박래수***· 정홍련****· 윤창훈*,**† · 장민철*,**†

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, polyvinyl alcohol (PVA)/graphene oxide (GO)/iron oxide (Fe3O4) magnetic microgels were prepared using a microfluidic approach and the dye adsorption capacity of the microgels was confirmed. The adsorption capacity (qe) of the gels was evaluated by varying the dye concentration, pH, and contact time with the microgels. The dyes used in this work were methylene blue (MB), crystal violet (CV), and malachite green (MG), and microgels showed the highest adsorption capacity (191.1 mg/g) in methylene blue. The microgels exhibited the highest adsorption capacity in the dye aqueous solution at pH 10 due to the presence of atomic nitrogen ions (N+) on the dye molecules. The adsorption isotherm studies revealed that the Langmuir isotherm is the best fit isotherm model for the dye adsorption on the microgels, indicative of monolayer adsorption. The kinetic analysis exhibited that the pseudo-second order model fits better than the pseudo-first order model, confirming that the adsorption process is chemisorption. In addition, the magnetic microgels showed good reusability and recovery efficiency. It was confirmed that the adsorption capacity of the gels maintains more than 70% of the initial capacity after 5 times of cycle experiments


본 연구에서는, 미세유체 시스템 기반 폴리바이닐알코올(PVA)/그래핀 옥사이드(GO)/산화철(Fe3O4) 자성 마이크로겔을 제조하고 겔의 염료 흡착성능을 평가하였다. 겔의 흡착성능(qe)은 염료의 농도, pH, 및 접촉시간을 변수로 하여 평가하였다. 사용된 염료는 메틸렌 블루(MB), 크리스탈 바이올렛(CV), 말라카이트 그린(MG)이며, 마이크로겔은 메틸렌 블루에 대해 가장 높은 흡착성능(191.1 mg/g)을 나타내었다. pH에 따른 겔의 흡착성능은 염료가 가지고 있는 atomic nitrogen 이온(N+)의 영향으로 모든 염료에서 pH가 10일 때 가장 높은 흡착성능을 나타냈다. 등온흡착 데이터분석을 통해 Langmuir 등온선의 일치도가 높아 단분자층 흡착임을 확인하였으며, 동역학적 분석에서는 유사 1차 반응 보다 유사 2차 반응의 일치도가 높아 화학흡착임을 확인하였다. 또한, 자성 마이크로겔의 회수와 겔표면에 흡착된 염료의 탈착을 통한 재사용 성능을 평가하였는데, 흡착성능은 흡∙탈착 5회동안 70% 이상의 성능을 유지하는 것으로 나타났다


Keywords: 미세유체(Microfluidics), 자성 마이크로겔(Magnetic Microgels), 삼투압(Osmotic Pressure), 염료제거(Dye Removal)

This Article

Correspondence to

  • Changhun Yun, Mincheol Chang

  • * Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, Korea
    ** School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, Korea

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