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Citation: SHI Zhong-Liang, WANG Xing-Xing, YAO Shu-Hua. Heterogeneous Fenton Degradation of Methylene Blue by δ-MnO2-Coated Fe-Pillared Bentonite[J]. Chinese Journal of Inorganic Chemistry, ;2015, (4): 696-702. doi: 10.11862/CJIC2015.112 shu

Heterogeneous Fenton Degradation of Methylene Blue by δ-MnO2-Coated Fe-Pillared Bentonite

  • 1.

    School of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China

  • Corresponding author: YAO Shu-Hua, 
  • Received Date: 24 September 2014
    Available Online: 23 December 2014

    Fund Project: 国家自然科学基金(No.41373127) (No.41373127)辽宁省自然科学基金项目(No.2013020121)资助。 (No.2013020121)

  • A series of δ-MnO2-coated Fe-pillared bentonite composite materials were synthesized and the samples were used as catalysts for the heterogeneous Fenton degradation of methylene blue.The microstructure of the catalysts was characterized by X-ray diffraction (XRD), specific surface area measurements (SBET),scanning electron microscopy (SEM). The results showed that the pillaring process increased the basal spacing (d001) from 1.47 nm for bentonite (MTT) to 1.51 nm for the Hydroxyl-pillared bentonite(H-Fe-P-E) and 1.55 nm for the δ-MnO2-coated Fe-pillared bentonite(H-Fe-P-E-M). The SBET values of the samples were increased after pillaring compared with bentonite. The catalytic activity of different samples was estimated by measuring the degradation rate of methylene blue(MB) in aqueous solution at MB concentration=50 mg·L-1,catalyst dosage=0.1 g·L-1,T=25℃,and the effects of various experimental parameters such as initial H2O2 concentration, δ-MnO2 content and initial solution pH value on MB degradation were studied. The results showed that the catalytic activity of δ-MnO2-coated Fe- pillared bentonite increased with H2O2 concentration and reached a optimal catalytic result when the molar ratio of nFe/nMn=0.241. The kinetics of degradation reaction can be expressed by the first-order reaction kinetic model. In addition, the recyclability of the prepared catalyst is also confirmed. The catalyst retains high activity after being used three times.
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