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
Pages 10-16 (7)
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.
Selectivity, nitrate, acrylic, resin, competing anions.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China.