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Effect of KMnO 4 on the Structure and Adsorption Behavior of Hydrous Manganese Dioxide Toward Pb(II) and Cd(II)
Author(s) -
Wu Shanshan,
Xie Fencun
Publication year - 2019
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201900081
Subject(s) - crystallinity , manganese , adsorption , nucleation , chemistry , zeta potential , inorganic chemistry , decomposition , materials science , crystallography , nanotechnology , organic chemistry , nanoparticle
Four kinds of hydrous manganese dioxide (HMO) with different morphologies are synthesized by one‐pot method in this work. The effect of KMnO 4 on structure and adsorption behavior of HMO has been thoroughly investigated by XRD, SEM, TEM, BET, and zeta potential analysis. The HMOs prepared are all δ‐MnO 2 , and a higher concentration of KMnO 4 leads to a disordered, lower crystallinity structure, and higher absolute zeta potential values of HMO in the same condition, which exhibits a better adsorption capacity of 478.2 mg g −1 for Pb(II) and 135.2 mg g −1 for Cd(II). The addition of KMnO 4 after reaction can also affect structure and adsorption capacity of HMO, it is characterized by higher crystallinity, fewer lattice defects, and higher adsorption capacity. The SEM and TEM analyses indicate that the possible formation is divided into two steps, involving the nucleation and shell growth, in a higher concentration of KMnO 4 : the first step is the reaction of KMnO 4 and Mn 2+ , the second is KMnO 4 decomposition with H + . In contrast, there is only the nucleation step in insufficient KMnO 4 . The addition of KMnO 4 after reaction also involves two steps.