Facile In-Situ Synthesis of Manganese Dioxide Nanosheets on Cellulose Fibers and their Application in Oxidative Decomposition of Formaldehyde

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• 作者：Li Zhou ; Junhui He ; Jie Zhang ; Zhicheng He ; Yucai Hu ; Changbin Zhang ; Hong He
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 1, 2011
• 年：2011
• 卷：115
• 期：34
• 页码：16873-16878
• 全文大小：1005K
• 年卷期：v.115,no.34(September 1, 2011)
• ISSN：1932-7455

文摘

In situ synthesis of manganese dioxide was carried out under ambient conditions on porous cellulose fibers as support. MnO₂/cellulose composites with different MnO₂ loadings were obtained by tuning the concentration of aqueous KMnO₄. Physical and chemical properties of the MnO₂/cellulose composites were characterized by SEM, TEM, and XRD. When the concentration of aqueous KMnO₄ falls in the range of 6.33鈥?2.6 mM, the obtained MnO₂ shows a nanosheet morphology and is uniformly coated on the cellulose fiber. The catalytic activities of MnO₂/cellulose composites were investigated for the oxidative decomposition of HCHO. The nanostructured MnO₂/cellulose composites show excellent catalytic performance for the oxidative decomposition of HCHO. Among them, 8.86 wt % MnO₂/cellulose has the highest catalytic activity. The HCHO conversion per milligram of MnO₂ of 8.86 wt % MnO₂/cellulose is about 9鈥?7 times as high as that of birnessite MnO₂ powder prepared by a hydrothermal method. The catalytic activity was found to be dependent not only on the content of MnO₂, but also on the adsorption of HCHO on cellulose fibers as well. These two factors are supposed to give rise to the highest catalytic activity for 8.86 wt % MnO₂/cellulose. The high efficiency combined with the easy applicability makes the MnO₂/cellulose composites more promising for practical applications as compared to MnO₂ powders.