Selective nitrate removal from aqueous solutions by a hydrotalcite-like absorbent FeMgMn-LDH.
Sci Rep
; 10(1): 16126, 2020 Sep 30.
Article
em En
| MEDLINE
| ID: mdl-32999339
ABSTRACT
FeMgMn-LDH, a type of potential environmental remediation material, has been synthesized via a co-precipitation method, and its adsorption characteristics for nitrate were investigated in this study. It's shown that the prepared FeMgMn-LDH is a promising adsorbent for anions removal, which has high buffer capacity (final pH remained between 9 and 10) and high reversibility, and can remove nitrate ions selectively though an anion-sieve effect. The maximum amount of nitrate adsorption is 10.56 N-mg g-1 at 25 â. The removal rate of nitrate ions can reach 86.26% with the adsorbent dose of 5 g/L in a real water. The competition order of coexisting anions on nitrate adsorption by FeMgMn-LDH is CO32- > PO43- > SO42-. The negative values of ΔG0 (from - 27.796 to - 26.426 kJ mol-1) and ΔH0 (- 6.678 kJ mol-1) indicate that the nitrate adsorption process on the FeMgMn-LDH is spontaneous and exothermic. The main adsorption mechanisms of nitrate removal from aqueous solutions by FeMgMn-LDH are electrostatic attraction and ion exchange.
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MEDLINE
Idioma:
En
Ano de publicação:
2020
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Article