Preparation and Characterization of Hierarchically Porous SiO₂@C@MnO₂ Monoliths

Abstract:

Hierarchical porous SiO₂@C@MnO₂ monoliths have been fabricated by two step approaches: Elemental carbon was covered the internal surface of porous silica monoliths with impregnation and carbonized in inert atmosphere, and MnO₂ was directly grown on the skeleton of SiO₂@C accompanied by redox reaction between C and KMnO₄. The effects of glucose and KMnO₄ concentrations, and hydrothermal reaction on the morphology of MnO₂ particles on the surface of SiO₂ monoliths were investigated in detail. The results showed that the optimal factors of reaction condition involved 0.08 mol·L^-1 glucose solution, 0.03 mol·L^-1 KMnO₄ solution and the reaction time of 5 h. SEM images and BET results indicated that the macroporous structure of the as-prepared material was preserved after modification, while the specific surface area and pore volume decreased with increasing amount of MnO₂ to some degree. The XPS spectra of SiO₂@C@MnO₂ is in good agreement with reported data in MnO₂. The crystal phase of MnO₂ was α-MnO₂ after thermal treatment at the temperature of 600 °C from the XRD patterns. Three-dimensional porous well-defined morphological SiO₂@C@MnO₂ be promising materials for the catalytic elimination of air pollutants since large quantities can be obtained from porous structure combined with α-MnO₂ equipped with high active performance.

• Periodical: Key Engineering Materials (Volume 768)
• Pages: 224-230
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.768.224
• Online since: April 2018
• Authors: Dao Yan Feng, Yu Xiao Li, Hui Yang, Xing Zhong Guo*
• Keywords: Catalytic Degradation, Porous Silica Monoliths, Redox Reaction, Volatile Organic Compounds (VOCs)

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