Microfluidic generation of Prussian blue-laden magnetic micro-adsorbents for cesium removal

Sung Min Kang, Muruganantham Rethinasabapathy, Seung Kuy Hwang, Go Woon Lee, Sung Chan Jang, Cheol Hwan Kwak, Sang Rak Choe, Yun Suk Huh

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Here, we designed and synthesized a recoverable multifunctional adsorbent using a microfluidic reaction system and evaluated the removal performance of the smart adsorbent toward radioactive cesium as a model sample. Prussian blue-laden magnetic micro-adsorbents (PB-MNPs-MAs) with uniform morphology and monodispersity were generated via two-step sequential procedures using a glass capillary microfluidic system, followed by chemical co-precipitation with a high production rate. The cesium removal efficacy of the PB-MNPs-MAs was analyzed based on Langmuir and Freundlich isotherms by controlling adsorption parameters such as adsorbent size, initial cesium concentration, and contact time. The adsorption isotherm of the PB-MNPs-MAs was better fitted to the Langmuir model with a maximum cesium adsorption capacity of 58.73 mg g−1, which was 40% higher than that of macro-adsorbents in a dynamic magnetic field. This result can be attributed to their large specific area, which increased the kinetic rate of cesium adsorption and achieved saturation within 20 min. Additionally, the PB-MNPs-MAs were recovered from wastewater within 5 s under a static magnetic field, indicating their great potential for magnetic actuation. We believe that our PB-MNPs-MAs can encapsulate nano-functional adsorbents and prevent actuation, making them promising for environmental remediation and especially for removal of radionuclides.

Original languageEnglish
Pages (from-to)218-226
Number of pages9
JournalChemical Engineering Journal
Volume341
DOIs
StatePublished - 1 Jun 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Cesium
  • Glass capillary device
  • Hydrogel
  • Micro-adsorbent
  • Prussian blue

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