Mn-Fe Layered Double Hydroxide Intercalated with Ethylene-Diaminetetraacetate Anion: Synthesis and Removal of As(III) from Aqueous Solution around pH 2-11

Int J Environ Res Public Health. 2020 Dec 14;17(24):9341. doi: 10.3390/ijerph17249341.

Abstract

A novel adsorbent Mn-Fe layered double hydroxides intercalated with ethylenediaminete-traacetic (EDTA@MF-LDHs) was synthesized by a low saturation coprecipitation method. The behavior and mechanism of As(III) removed by EDTA@MF-LDHs were investigated in detail in comparison with the carbonate intercalated Mn-Fe layered double hydroxides (CO3@MF-LDHs). The results showed that EDTA@MF-LDHs had a higher removal efficiency for As(III) than As(V) with a broader pH range than CO3@MF-LDH. The large adsorption capacity of EDTA@MF-LDHs is related to its large interlayer spacing and the high affinity of its surface hydroxyl groups. The maximum adsorption capacity for As(III) is 66.76 mg/g at pH 7. The FT-IR and XPS characterization indicated that the removal mechanism of the As(III) on EDTA@MF-LDHs include surface complexation, redox, and ion exchange.

Keywords: As; EDTA; LDHs; ion exchange; redox reaction.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anions* / chemical synthesis
  • Arsenic* / isolation & purification
  • Chemistry Techniques, Analytical* / methods
  • Edetic Acid* / chemistry
  • Hydrogen-Ion Concentration
  • Hydroxides / chemistry
  • Iron* / chemistry
  • Magnesium* / chemistry
  • Spectroscopy, Fourier Transform Infrared

Substances

  • Anions
  • Hydroxides
  • Edetic Acid
  • Iron
  • Magnesium
  • Arsenic