supported by the National Natural Science Foundation of China(Grant Nos.40403009 and 40101017);by Research Fund for the Doctoral Program of Higher Education(Grant No.2002050411).
Birnessite is a common weathering and oxidation product of manganese-bearing rocks. An O2 oxidation procedure of Mn(OH)2 in the alkali medium has been used to synthesize birnessite. Fast and powder X-ray diffraction (...