Selective Adsorption of Nitrate by a Macroporous Acrylic Anion Exchange Resin: Effect of the Competing Anions
Haiou Song, Changming Wang, Baijun Wang, Yeli Jiang, Zhijian Yao, Aimin Li, Rong Ma and Yang Zhou
Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China.
A novel macroporous anion exchange resin (NDP-5) has been successfully developed for selectivity removing
nitrate utilizing the acrylic cross-linked polymer skeleton. The process of the nitrate adsorption onto NDP-5 resin follows
the Freundlich model, the pseudo-first-order and the pseudo-second-order kinetic models well. Compared to the
commercial resin D213, NDP-5 resin displays more preferable adsorption ability toward NO 3
− from the model solution at
the presence of the competing anion (Cl−, HCO 3
− or SO 4
2− ) at much greater levels. The contrastive experiment results
showed that SO 4
2− with the divalent negative charges has a small effect on the sorption selectivity of NDP-5 resin
functionalized with triethylamine at the exchange sites. The equilibrium adsorption capacity of NDP-5 resin is 3.2 times
higher than that of D213 at initial concentration with the molar ratio of 1/30 (NO 3
− /SO 4
2− , N/N). Batch and column
adsorption demonstrated concentrations of equivalence ratio that nitrate sorbed on NDP-5 resin could result in its
conspicuous decrease. These observations pointed out that NDP-5 resin is a promising adsorbent for nitrate selective
removal from the model solution.
Keywords: Selectivity, nitrate, acrylic, resin, competing anions.
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