A highly efficient magnetic chitosan “fluid” adsorbent with a high capacity and fast adsorption kinetics for dyeing wastewater purification

Ma Hui, Pu Shengyan, Hou Yaqi, Zhu Rongxin, Zinchenko Anatoly, Chu Wei

Research output: Journal article publicationJournal articleAcademic researchpeer-review

66 Citations (Scopus)

Abstract

A novel magnetic fluid adsorbent (magnetic chitosan “fluid” MCF) was prepared via a one-step in situ co-precipitation procedure using inexpensive and environmentally friendly chitosan (CS) and iron precursor. The resultant ultrafine colloid was characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). The sorption and desorption characteristics of the composite were studied using a common Congo Red (CR) anionic dye to evaluate the suitability of the MCF for anionic dye wastewater purification. As an important advantage, the dye adsorption could be achieved in a wide alkaline pH range and reached the equilibrium within 5 min demonstrating the superior properties of our material compared the previously reported CS-based adsorbents. The adsorption obeyed the Langmuir isotherm model with the remarkable maximum adsorption capacity of approx. 1700 mg/g for CR under neutral pH. NaOH treatment was utilized to desorb and regenerate MCF, while the removal rate still remained above 90% after recycling five times, demonstrating that the MCF could be employed for repeated use without significant capacity loss. MCF could be readily separated from water within 30 s under a low magnetic field (<0.035 T). Overall, the ultrafine colloidal state of the synthesized MCF enabled a rapid pollutant uptake, high adsorption capacity, and reusability. The above characteristics of MCF and its environmentally friendly composition make it a very promising material for practical dyeing wastewater purification.

Original languageEnglish
Pages (from-to)556-565
Number of pages10
JournalChemical Engineering Journal
Volume345
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Adsorption kinetics
  • Dyeing wastewater
  • High adsorption capacity
  • In situ co-precipitation
  • Magnetic chitosan fluid

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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