Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (4): 636.doi: 10.7503/cjcu20160731

• Physical Chemistry • Previous Articles     Next Articles

Facile Cyclohexane-mediated Hydrothermal Synthesis of Modified δ-MnO2 with Enhanced Fenton-like Catalytic Activity

MA Zichuan, LI Junshu, XING Shengtao*()   

  1. College of Chemistry and Material Sciences, Key Laboratory of Inorganic Nanomaterial of Hebei Province,Hebei Normal University, Shijiazhuang 050024, China
  • Received:2016-10-21 Online:2017-04-10 Published:2017-03-16
  • Contact: XING Shengtao E-mail:stxing07@sina.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21677046 ), and the Science and Technology Emphasis Research Projects of Universities in Hebei Province, China(No ZD20131005)

Abstract:

Unmodified δ-MnO2(CHM-0) and modified δ-MnO2(CHM-2, CHM-5 and CHM-10) were prepared via a hydrothermal method employing the reaction between KMnO4 and different amounts(0, 2, 5 or 10 mL) of cyclohexane. The products were characterized by X-ray diffraction(XRD), field emission scanning electron microscope(FESEM), transmission electron microscopy(TEM) and nitrogen adsorption-desorption measurements. The oxidation products of cyclohexane in the hydrothermal process were identified by gas chromatography-mass spectrometry(GC-MS). Their Fenton-like activity and adsorption capacity for methylene blue(MB) were investigated. The effect of radical scavengers on the degradation of MB was also studied. The results indicate that the adsorption capacity of the modified samples increased with increasing the amount of cyclohexane, and CHM-5 exhibited the highest catalytic activity. The addition of cyclohexane could modify the morphology and crystallinity of δ-MnO2, and its oxidation products consisted of acetone, cyclohexanol and cyclohexanone. The surface area of CHM-5 was 148.7 m2/g, much larger than 15.9 m2/g of CHM-0. Hydroxyl radicals were the main active species.

Key words: MnO2, Surface modification, Cyclohexane, Heterogeneous Fenton-like catalysis

CLC Number: 

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