Abstract
We report the selective adsorptive properties for NO3− in seawater of Ni-Fe layered double hydroxide (LDH (Ni-Fe)), containing Ni and Fe metal atoms in each layer. LDH (Ni-Fe) with Cl− in the interlayers was synthesized by co-precipitation at constant pH. It showed a higher distribution coefficient (K d ) for NO3− than for other anions (HPO42 −, SO42 − etc.). NO3− adsorption on LDH (Ni-Fe) was also studied batchwise using NO3− enriched seawater (NO3− concentration: 40 μ mol/dm3). The NO3− uptake attained equilibrium after the adsorption for 4 h. The adsorption isotherm followed Freundlich’s equation. The NO3− uptake reached 0.33 mmol/g when LDH (Ni-Fe) (0.10 g) was added to NO3− enriched seawater (1 dm3), corresponding to the removal of 83% NO3− from seawater. The pH dependence of NO3− adsorption showed a maximum NO3− uptake at around pH 8 with low Ni dissolution (less than 0.6%). This adsorbent is therefore promising for the selective removal of NO3− from seawater for the benefit of the environment.
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Tezuka, S., Chitrakar, R., Sonoda, A. et al. Studies on Selective Adsorbents for Oxo-Anions. NO3− Adsorptive Properties of Ni-Fe Layered Double Hydroxide in Seawater. Adsorption 11 (Suppl 1), 751–755 (2005). https://doi.org/10.1007/s10450-005-6018-0
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DOI: https://doi.org/10.1007/s10450-005-6018-0