Ordered mesoporous silica cubic particles decorated with silver nanoparticles: a highly active and recyclable heterogeneous catalyst for the reduction of 4-nitrophenol
| Autor: | Shu-Ting Chen, Bo Li, Dong-Fang Qiu, Kun Wang, Xiao-Jing Xing, Zhou Wu, Xue-Guo Liu, Huitao Fan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
010405 organic chemistry Mesoporous silica 010402 general chemistry Heterogeneous catalysis 01 natural sciences Silver nanoparticle Nanomaterial-based catalyst 0104 chemical sciences Catalysis Inorganic Chemistry Chemical engineering Specific surface area Stöber process Mesoporous material |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 48(8) |
| ISSN: | 1477-9234 |
| Popis: | In this work, using a modified Stober process, we synthesized ordered mesoporous silica cubic particles (OMS-C) and prepared a nanocatalyst (Ag–OMS-C) based on OMS-C with a high surface area via an in situ auto-reduction strategy. The as-prepared Ag–OMS-C nanocomposites demonstrated open mesopores (3.51 nm), a large specific surface area (540 m2 g−1) and a high pore volume (0.88 cm3 g−1). The catalytic reduction of 4-nitrophenol (4-NP) over the Ag–OMS-C nanocatalyst was almost complete within 150 s without stirring and the rate constant k (30 × 10−3 s−1) is much higher than those of other substrate-supported Ag nanocatalysts. Moreover, the Ag–OMS-C nanocomposites hold a stable catalytic efficiency over five reaction cycles. The results indicate that the Ag–OMS-C nanocatalyst exhibited high catalytic activity and good reusability toward the reduction of 4-NP, which might be attributed to the large specific surface area, the pore structure of the nanocatalyst, as well as the synergistic effect between OMS-C and AgNPs. |
| Databáze: | OpenAIRE |
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