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      저자 : Pengwu Zheng (검색결과 2 건)
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        Adsorption and photodegradation of methylene blue on TiO2-halloysite adsorbents

        Yuanyuan Du,Pengwu Zheng 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11

        TiO2-halloysite (TiO2-HNT) composites were fabricated by depositing anatase TiO2 on the halloysite (HNT)surfaces with calcination treatment at 100, 200, 300 and 500 oC. The obtained composites were characterized by trans-mission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD). HNT was attached with TiO2 particles or clusters in sizes of 10-30 nm. With the increasing of calcination temperature,the crystalline of anatase became more perfect, but the structure of HNT could be destroyed at 500 oC. The adsorptionand photodegradation of methylene blue (MB) by TiO2-HNTs were investigated. The kinetic adsorption fit the pseudosecond-order, and the isotherm data followed the Langmuir model. The maximum adsorption capacities of MB werein the range of 38.57 to 54.29 mg/g. TiO2-HNTs exhibited an efficient photocatalytic activity in the decomposition ofMB. For TiO2-HNT calcined at 300 oC, 81.6% MB were degraded after 4 h treatment of UV irradiation.

      • KCI등재

        Synthesis of rectorite/Fe3O4-CTAB composite for the removal of nitrate and phosphate from water

        Fei Wang,Dan Liu,Pengwu Zheng,Xiaofei Ma 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-

        The rectorite/Fe3O4-CTAB composite (REC/Fe3O4-CTAB) was fabricated by introducing cetyl trimethylammonium bromide (CTAB) and Fe3O4 onto the layers of raw rectorite (REC). The layers of rectorite wereintercalated or exfoliated, and CTAB enhanced the electrostatic attraction by quaternary ammoniumcations towards nitrate and phosphate anions. The order of Fe3O4 and CTAB introduction had great effecton the adsorption. When Fe3O4 was loaded before CTAB on REC, the obtained composites exhibitedbetter adsorption. Themaximum adsorption capacities could reach 182.1 mg/g for NO3and 174.5 mg/gfor PO43 . Besides, REC/Fe3O4-CTAB composite could be easily regenerated with NaOH solution.

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