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

By Ma Hui, Shengyan Pu, Hou Yaqi, Rongxin Zhu, Z. Anatoly, C. Wei. Chemical Engineering Journal, 2018

151 citations recorded by the source corpus.

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 (

Subfields: Industrial and Manufacturing Engineering, Organic Chemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/1bee0f00f2514e7f6e5f1e946e6e26cf1ae92851