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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.
Lignosulfonate-Assisted Hydrothermal Synthesis of Mesoporous MnFe2O4 and Fe3O4 for Pb(II) Removal
Yuan Ma,SHENGTAO XING,YINSU WU,Yuanzhe Gao,ZICHUAN MA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.3
The development of efficient magnetic adsorbents is highly desirable for water treatment. In this work, MnFe2O4 and Fe3O4 were prepared by a lignosulfonate-assisted hydrothermal method. The structure, surface property and adsorption capacity of the products were investigated. The obtained products have a small amount of carbonaceous materials, mesoporous structure and narrow pore size distribution. In comparison with the samples prepared without lignosulfonate, they have more surface hydroxyl groups and highly negatively charged surface in aqueous solution, which favor the adsorption of cations. Fe3O4 and especially MnFe2O4 exhibited high adsorption capacity towards Pb(II). The maximal removal efficiency of Pb(II) (50 mg L -1) on MnFe2O4 was 100% at pH 6.2. The results demonstrate that this method is promising for the synthesis of magnetic adsorbent.