Removal of Methylene Blue from Aqueous Solution by Manganese Oxide Nano-Sheets

Abstract:

MnO₂ nanosheets were synthesized with tetramethylamine, H₂O₂, MnCl₂·4H₂O and its suspension were prepared for its high efficient removal of methylene blue (MB). MB removal reached as high as 95% when MB concentrations were less than 500 mg/L at pH 11. The adsorption data fitted better with Freundlich isotherm model than Langmuir model indicating the heterogeneous adsorption nature of MB on MnO₂ nanosheets. The maximum adsorption capacity of MnO₂ nanosheets was ~4,300 mg/g, which is the highest reported so far. The MnO₂ nanosheets suspension was aggregated as precipitates after adsorption of MB. Our results demonstrated that dispersive MnO₂ nanosheets have a potential application on adsorption of organics from solution with strong base and high salinity.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 5431-5434
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.5431
• Online since: September 2014
• Authors: Liang Peng*
• Keywords: Adsorption, Manganese Oxide, Methylene Blue, Nano-Sheet

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