Preparation of nitrate-selective porous magnetic resin and assessment of its performance in removing nitrate from groundwater.

Environmental technology

PubMedID: 27266897

Liu C, Zhu L, Zhang Q, Chen W. Preparation of nitrate-selective porous magnetic resin and assessment of its performance in removing nitrate from groundwater. Environ Technol. 2016;1-8.
Nitrate-selective, porous magnetic anion-exchange resin (NS-PMAER) with enhanced af?nity 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 speci?c surface area of 21. 38 nm, 0. 3605 cm(3)/g, and 67. 455 m(2)/g, respectively. The speci?c 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 coef?cients 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 ?ve rounds of recycling.

RESULTS
of the pilot test indicate that NS-PMAER could effectively remove nitrate in groundwater, and ensure that nitrate concentrations of ef?uent to meet the guideline limit for drinking water by the World Health Organization.