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

Author(s): Haiou Song, Changming Wang, Baijun Wang, Yeli Jiang, Zhijian Yao, Aimin Li, Rong Ma, Yang Zhou

Journal Name: Current Environmental Engineering
Continued as Current Environmental Management

Volume 1 , Issue 1 , 2014

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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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Article Details

Year: 2014
Page: [10 - 16]
Pages: 7
DOI: 10.2174/2212717801666140307002811

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PDF: 27