Quaternized magnetic microspheres for the efficient removal of reactive dyes.

Chendong Shuang, Penghui Li, Aimin Li, Qing Zhou, Mancheng Zhang, Yang Zhou

State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China.

Water research 2012 Sep 15

filter terms:

In this paper, a novel quaternized magnetic resin, NDMP, was prepared and characterized. Two reactive dyes (RDs), Orange G (OG) and red RWO, were used as a small-molecular RD and large-molecular RD, respectively, to investigate their adsorption on NDMP. A common quaternized magnetic resin, MIEX, was selected for comparison. The adsorption kinetics of OG onto both resins and the adsorption kinetics of RWO onto NDMP followed pseudo-second-order kinetics, whereas the adsorption of RWO onto MIEX was better fitted by pseudo-first-order kinetics. The experimental data illustrated that the equilibrium adsorption amount of both RDs onto NDMP (1.9 mmol OG/g, 0.70 mmol RWO/g) was twice as large as that on MIEX (1.0 mmol OG/g, 0.35 mmol RWO/g). The Langmuir equation and the Freundlich model fit the isotherm data for OG and RWO adsorption, respectively. The adsorption of OG on the NDMP and MIEX resins declined in the presence of NaCl or Na₂SO₄. The effects of the salts on the adsorption of RWO were different. The recyclability of NDMP and MIEX were also evaluated. This work provides a reusable efficient adsorbent for the removal of RDs. Copyright © 2012 Elsevier Ltd. All rights reserved.

Citation

Chendong Shuang, Penghui Li, Aimin Li, Qing Zhou, Mancheng Zhang, Yang Zhou. Quaternized magnetic microspheres for the efficient removal of reactive dyes. Water research. 2012 Sep 15;46(14):4417-26