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Current Environmental Engineering
ISSN (Print): 2212-7178
ISSN (Online): 2212-7186
VOLUME: 1
ISSUE: 1
DOI: 10.2174/2212717801666140307002811









Selective Adsorption of Nitrate by a Macroporous Acrylic Anion Exchange Resin: Effect of the Competing Anions

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Author(s): Haiou Song, Changming Wang, Baijun Wang, Yeli Jiang, Zhijian Yao, Aimin Li, Rong Ma and Yang Zhou
Pages 10-16 (7)
Abstract:
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.
Affiliation:
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China.