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ZICHUAN MA,YINSU WU,SHENGTAO XING,YONGFANG CHANG,XIAORU WEI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.7
Various manganese oxides nano/micro-crystals, including Mn 3 O 4 octahedrons, hierarchical °ow-er-like K- ? -MnO 2 microspheres, multi-branch and strip-shaped ? -MnOOH, have been prepared bya lignosulfanate (LSN)-mediated hydrothermal process. The e®ect of LSN on the structure andmorphology has been thoroughly investigated by X-ray powder di®raction and scanning electronmicroscopy (SEM). The results indicated that stepwise reduction and Ostwald's ripening occurredsimultaneously in this hydrothermal process, and LSN could serve as both reducing agent andgrowth modi¯er. The appropriate reducing capacity and selective absorption ability of LSN playedan important role for the formation of various manganese oxides nano/micro-crystals. The cat-alytic performance of the products for the oxidation of o-xylene has been also investigated. Theresult showed that the MnO 2 crystals prepared with LSN exhibited the highest catalytic activity.