Journal
DESALINATION AND WATER TREATMENT
Volume 54, Issue 12, Pages 3400-3411Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2014.912589
Keywords
Equilibrium; Nitrate; Adsorption; Mg/Fe hydrotalcite; Kinetics
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Funding
- National Natural Science Foundation of China (NSFC) [51008128, 41071305]
- Fundamental Research Funds for the Central Universities [2011ZM0052]
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A laboratory study was conducted to investigate the use of Mg/Fe hydrotalcite-like compounds for the removal of nitrate from synthetic solution. A series of calcined hydrotalcites (CHTlcs) with different chemical composition were investigated to remove nitrate. The highest nitrate percentage of adsorption (about 95%) and adsorption capacity (about 70 mg/g) were obtained by using the CHTlcs with Mg/Fe molar ratio of 3. The adsorption experiments were carried out under various equilibration conditions, such as adsorbent dose, pH, temperature, and competitive ions. It was found that 1.5 g/L Mg/Fe CHTlcs could achieve ideal adsorption efficiencies of nitrate during the nitrate adsorption process with an initial nitrate concentration of 100 mg/L at pH 8 and at temperature 30 degrees C. Various co-existing anions interfered in the adsorption of nitrate. The inhibitory effect was in the order of phosphate > sulfate > chloride. Adsorption isotherms showed that the experimental equilibrium data was fitted better by the Langmuir isotherm model than the Freundlich. The adsorption kinetics was successfully fitted by pseudo-second-order kinetics. And the characterization of the Mg/Fe CHTlcs was also analyzed to validate adsorption process. Results showed promising utility of Mg/Fe CHTlcs that could be developed into a viable technology for nitrate removal from water.
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