Preparation of nitrate-selective porous magnetic resin and assessment of its performance in removing nitrate from groundwater. Issue 3 (1st February 2017)

• Record Type: Journal Article
• Authors: Liu, Cheng; Zhu, Lifei; Zhang, Qian; Chen, Wei
• Is Part Of: Environmental technology. Volume 38:Issue 3(2017)
• Page Start: 231
• Page End: 238
• Publication Date: 2017-02-01
• Subjects: Groundwater -- nitrate -- drinking water -- nitrate-selective porous magnetic anion-exchange resin; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1189970
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Nitrate-selective, porous magnetic anion-exchange resin (NS-PMAER) with enhanced affinity and higher selectivity for nitrate was synthesized, characterized and its performance in nitrate removal was investigated. The results show that NS-PMAER consists of spherical particles with an average size of 200 μm. It has mean pore diameter, total pore volume, and BET specific surface area of 21.38 nm, 0.3605 cm 3 /g, and 67.455 m 2 /g, respectively. The specific saturation magnetization of NS-PMAER was about 10.79 emu/g. Fourier transform infrared spectrometer (FTIR) and X-ray photoelectron spectroscopy (XPS) results indicate that NS-PMAER has selectivity for nitrate higher than that of MIEX® resin; its coefficients of selectivity toward nitrate for nitrate and sulfate are 20.978 and 6.769, respectively, higher than those of MIEX® resin (1.256 and 4.342, respectively). Its working exchange capacity was 72.41 mg/mL. Column-exchange experiments' results suggest that it could be easily regenerated using 1.5 mol/L sodium chloride solution for a contact time of 30 min. Its recovery rate stayed at > 95% even after five rounds of recycling. Results of the pilot test indicate that NS-PMAER could effectively remove nitrate in groundwater, and ensure that nitrate concentrations of effluent to meet the guideline limit for drinking water by the World Health Organization.