• Zhen Li

      Articles written in Bulletin of Materials Science

    • Preparation of PbSe nanoparticles by electron beam irradiation method

      Zhen Li Chao Wu Yanyan Liu Tiebing Liu Zheng Jiao Minghong Wu

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      A novel method has been developed by electron beam irradiation to prepare PbSe nanoparticles. 2 MeV 10mA GJ-2-II electronic accelerator was used as radiation source. Nanocrystalline PbSe was prepared rapidly at room temperature under atmospheric pressure without any kind of toxic reagents. The structure and morphology of prepared PbSe nanoparticles were analysed by X-ray diffraction, transmission electron microscope and atomic force microscope. The results indicated that the obtained materials were cubic nanocrystalline PbSe with an average grain size of 30 nm. The optical properties of prepared PbSe nanocrystalline were characterized by using photoluminescence spectroscopy. The possible mechanism of the PbSe grain growth by electron beam irradiation method is proposed.

    • UV and visible light photodegradation effect on Fe–CNT/TiO2 composite catalysts

      Zhen Li Jin Liu Feng-Jun Zhang Won-Chun Oh

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      Using multi-walled carbon nanotube (CNT) as an one-dimensional support, we have succeeded in uniformly anchoring of TiO2 and Fe nanoparticles at its surface. The as-prepared Fe–CNT/TiO2 composite photocatalysts have been investigated by degrading methylene blue (MB) under UV and differently intensified visible light irradiation. The ability of CNT to store and shuttle electrons, and Fe nanoparticles demonstrate its capability to serve as a yield and transfer electrons on demand to separate h+/e- pairs. Moreover, the MB photodegradation increase with an increase of visible light intensity can be ascribed to the enhancement MB cationic radical. In addition, chemical oxygen demand (COD) of piggery waste and reduction efficiency of Cr (IV) was done at regular intervals, which gave a good idea about mineralization of wastewater.

    • Al-doped Nb$_3$O$_7$F nanosheets: preparation, characterization and photocatalytic performance under visible light irradiation


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      Doping can result in energy band rearrangement, high carrier concentration and fast carrier separation in semiconductor materials. Consequently, great enhancement in the photocatalytic performance can be achieved. In this work,Al3+-doped niobium oxyfluoride (Nb$_3$O$_7$F) was synthesized by a facile hydrothermal approach for the first time. A series of characterization tools were used to investigate the phase, composition, microstructure, chemical state, spectrum response and band gap. The influence of Al doping on the photocatalytic performance was also investigated by varying the molarratios of Al/Nb. The results confirmed that Al atoms have been successfully incorporated into the Nb$_3$O$_7$F lattice. Al doping led to slightly lowering of the band gap of Nb$_3$O$_7$F from 3.08 to 2.99 eV. Moreover, Nb$_3$O$_7$F with 0.06 mol% Al doping exhibited the highest degradation efficiency for methyl blue under visible light irradiation. Crystal defects generated by appropriate Al-doping increased the specific surface area and the optimized band gap could be responsible for the improved photocatalytic activity.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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