Manganese Dioxide nanosheet suspension: A novel absorbent for Cadmium(II) contamination in waterbody

J Colloid Interface Sci. 2015 Oct 15:456:108-15. doi: 10.1016/j.jcis.2015.06.017. Epub 2015 Jun 17.

Abstract

A MnO2 nanosheet (MnO2-NS) suspension was prepared from tetramethylammonium hydroxide (TMA⋅OH), H2O2, and MnCl2⋅4H2O, and its efficiency for Cd(II) removal from aqueous solutions was investigated. The maximum adsorption capacity of the MnO2-NS for Cd(II) was evaluated to be about 348 mg/g, which is thus far the highest value reported for MnO2 at pH 6.0. This high adsorption capacity is attributed to efficient ion exchange. X-ray photoelectron spectroscopy (XPS) revealed that Cd(II) was adsorbed on MnO2 as CdO and Cd(OH)2. After Cd(II) adsorption, the suspended MnO2-NS aggregated and precipitated within 5.0 min from solution. Therefore, dispersive MnO2-NS can be used to remove Cd(II) from wastewater rapidly and with high efficiency.

Keywords: Adsorption; Cadmium; Manganese oxide; Nanosheet.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Cadmium / chemistry*
  • Chlorides / chemistry
  • Hydrogen Peroxide / chemistry
  • Hydrogen-Ion Concentration
  • Ions
  • Kinetics
  • Manganese Compounds / chemistry*
  • Microscopy, Electron, Transmission
  • Nanoparticles / chemistry*
  • Oxides / chemistry*
  • Photoelectron Spectroscopy / methods
  • Quaternary Ammonium Compounds / chemistry
  • Suspensions
  • Time Factors
  • Wastewater
  • Water Pollutants, Chemical / analysis
  • Water Purification
  • X-Ray Diffraction

Substances

  • Chlorides
  • Ions
  • Manganese Compounds
  • Oxides
  • Quaternary Ammonium Compounds
  • Suspensions
  • Waste Water
  • Water Pollutants, Chemical
  • birnessite
  • Cadmium
  • Hydrogen Peroxide
  • tetramethylammonium
  • manganese chloride
  • manganese dioxide