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Manganese Dioxide nanosheet suspension: A novel absorbent for Cadmium(II) contamination in waterbody
- Peng, Liang, Zeng, Qingru, Tie, Boqing, Lei, Ming, Yang, Jiao, Luo, Si, Song, Zhengguo
- Journal of colloid and interface science 2015 v.456 pp. 108-115
- X-ray photoelectron spectroscopy, absorbents, adsorption, aqueous solutions, cadmium, hydrogen peroxide, ion exchange, manganese dioxide, nanosheets, pH, surface water, tetramethylammonium compounds, wastewater
- 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 348mg/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 5.0min from solution. Therefore, dispersive MnO2-NS can be used to remove Cd(II) from wastewater rapidly and with high efficiency.