Highly efficient removal of methylene blue from aqueous solution by a novel fishing-net effect of manganese oxide nano-sheets

Liang Peng*, Bin Liu, Qingru Zeng, Ji Dong Gu, Ming Lei, Jihai Shao, Liyuan Chai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Manganese (IV) oxide (MnO2) nano-sheets were synthesized using tetramethylamine, H2O2, and MnCl2·4H2O and used in suspension for removal of methylene blue (MB). Up to 95 % removal was achieved for MB concentrations less than 500 mg/L. The adsorption data fitted better with the Freundlich isotherm model than the Langmuir model, indicating a heterogeneous adsorption of MB on MnO2nano-sheets. The maximum adsorption capacity of MnO2nano-sheets was approximately 4300 mg/g, which is the highest yet reported. Suspensions of MnO2nano-sheets aggregated as precipitates after adsorption of MB. Using a suite of analyses, including X-ray diffraction and X-ray photoelectron spectroscopy, the high adsorption capacity was mainly attributed to ion exchange, coordination, and a fishing-net effect. The term, ‘fishing-net effect,’ is proposed here for the first time, to explain the extremely high adsorption capacity of nano-sheets, which increased with increasing ionic strength and sorbate concentration. Our results demonstrate that dispersive MnO2nano-sheets have a potential application in adsorption of organics from strongly basic solutions with high salinity.

Original languageEnglish
Pages (from-to)269-277
Number of pages9
JournalClean Technologies and Environmental Policy
Volume19
Issue number1
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Adsorption
  • Manganese oxide
  • Methylene blue
  • Nano-sheet

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