Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water

doi:10.1007/s11783-014-0724-3

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (1) : 96-104 https://doi.org/10.1007/s11783-014-0724-3

RESEARCH ARTICLE

Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water

Wei WANG,Yan MA,Qing ZHOU(

),Chendong SHUANG,Mancheng ZHANG,Aimin LI

State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China

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Abstract

A rapid and effective method based on a novel permanent magnetic hypercrosslinked resin W150 was proposed for the removal of organic micropollutants in drinking water. W150 was prepared by suspension and post-crosslinking reaction and found to possess a high specific surface area of 1149.7 m²·g^-1, a small particle size of 50 μm to 100 μm, and a saturation magnetization as high as 8 emu·g^-1. W150 was used to eliminate nitrofurazone (NFZ) and oxytetracycline (OTC) from drinking water compared with commercial adsorbents XAD-4 and F400D. The adsorption kinetics of NFZ and OTC onto the three adsorbents well fitted the pseudo-second-order equation (r>0.972), and the adsorption isotherms were all well described by the Freundlich equation (r>0.851). Results showed that the reduction in adsorbent size and the enlargement in sorbent pores both accelerated adsorption. Moreover, the effect of particle size on adsorption was more significant than that of pore width. Given that the smallest particle size and the highest specific surface area were possessed by W150, it had the fastest adsorption kinetics and largest adsorption capacity for NFZ (180 mg·g^-1) and OTC (200 mg·g^-1). For the adsorbents with dominant micropores, the sorption of large-sized adsorbates decreased because of the inaccessible micropores. The solution pH and ionic strength also influenced adsorption.

Keywords permanent magnetic resin organic micropollutant pore size molecular size adsorption

Corresponding Author(s): Qing ZHOU

Online First Date: 19 June 2014 Issue Date: 31 December 2014

Cite this article:

Wei WANG,Yan MA,Qing ZHOU, et al. Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water[J]. Front. Environ. Sci. Eng., 2015, 9(1): 96-104.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0724-3
https://academic.hep.com.cn/fese/EN/Y2015/V9/I1/96

Fig.1 Characterization of obtained resins: (a) SEM image of W150, (b) FT-IR sprctra of W150 and precursor beads, (c) magnetization curve of W150, and (d) image of W150 in water taken by Nikon Eclipse Ti-S

Tab.1 Physicochemical properties of the used adsorbents

Fig.2 Chemical structure and molecular size of (a) NFZ and (b) OTC

Fig.3 Adsorption kinetics of (a) NFZ and (b) OTC onto the three adsorbents

Tab.2 Kinetic parameters for the adsorption of NFZ and OTC onto the adsorbents

Tab.3 Constants for the Langmuir and Freundlich equations at 278, 293, and 308 K

Fig.4 Adsorption isotherms of NFZ on (a) W150, (c) XAD-4, (e) F400D and OTC on (b) W150, (d) XAD-4, (f) F400D at 278 K, 293 K, 308 K

Fig.5 Effects of the solution pH on the adsorption of (a) NFZ and (b) OTC onto the three adsorbents

Fig.6 Effects of the ionic strength of the solution on the adsorption of (a) NFZ and (b) OTC onto the three adsorbents

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