title: Manganese Dioxide nanosheet suspension: A novel absorbent for Cadmium(II) contamination in waterbody.
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.
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Peng
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Qingru
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Boqing
authors.initials: B
authors.lastname: Tie
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Lei
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Si
authors.initials: S
authors.lastname: Luo
authors.affiliation: Key Laboratory of Original Agro-Environment Quality of Ministry of Agriculture and Tianjin Key Laboratory of Agro-Environment and Safe-Product, Tianjin 300191, PR China; Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, PR China. Electronic address: forestman1218@163.com.
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Song
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D017895:Manganese Compounds / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D056951:Photoelectron Spectroscopy / Q000379:methods; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013535:Suspensions; D013997:Time Factors; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification; D014961:X-Ray Diffraction
chemical_list: D002104:Cadmium; D002712:Chlorides; D006861:Hydrogen Peroxide; D007477:Ions; D017895:Manganese Compounds; D010087:Oxides; D000644:Quaternary Ammonium Compounds; D013535:Suspensions; D062065:Wastewater; D014874:Water Pollutants, Chemical; C505018:birnessite; C027917:tetramethylammonium; C025340:manganese chloride; C016552:manganese dioxide
keywords: Adsorption; Cadmium; Manganese oxide; Nanosheet