Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (12): 1308-1314.DOI: 10.15541/jim20170104

• Orginal Article • Previous Articles     Next Articles

Preparation of MnS with Different Crystal Phases for Photocatalytic H2 Production from H2S

DAN Meng1,2, ZHANG Qian2, ZHONG Yun-Qian2, ZHOU Ying1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
  • Received:2017-03-06 Revised:2017-04-11 Published:2017-12-20 Online:2017-11-21

Abstract:

Cubic α-MnS and hexagonal γ-MnS were successfully prepared by a one-pot solvothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-Vis absorption spectrum were used to investigate the phase, microstructure, morphology, and optical property of the obtained samples. The photocatalytic H2 production performances from H2S of α-MnS and γ-MnS were evaluated both under visible light (λ > 420 nm) and UV-Vis light irradiation. The results revealed that both α-MnS and γ-MnS possess photo-splitting H2S activity under visible light, and the metastable state γ-MnS showed better photocatalytic H2 evolution performance (23.38 μmol/(g·h)) than the stable form α-MnS (4.24 μmol/(g·h)). Comparing the photocatalytic activity under visible light, it was found that the hydrogen production rate of α, γ-MnS under the full spectrum irradiation increased remarkably. A maximum H2 production rate of 2272.69 μmol/(g·h) was achieved over γ-MnS under the full spectrum irradiation. It is noteworthy that during the process of 6 h photocatalytic testing, α, γ-MnS displayed a good stability and resistance to the photocorrosion. In addition, the catalytic mechanism of α, γ-MnS was investigated. Finally, the reason for the difference in photocatalytic activity between these two MnS phases was explored.

 

Key words: manganese sulfide, photocatalysis, hydrogen sulfide, hydrogen, crystal structure

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