Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 371, Issue -, Pages 72-82Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.02.105
Keywords
Iron-rich coal fly ash; Pd; SiO2; p-nitrophenol; NaBH4
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Funding
- National Research Foundation of Korea [NRF-2016R1D1A1B03930142]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy (MOTIE) [20174010201490]
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In this study, a magnetically recyclable Pd catalyst was developed by using the novel support of iron-rich coal fly ash/silica (IRFA@SiO2) for highly efficient reduction of p-nitrophenol (p-NP). IRFA microspheres were coated with amorphous SiO2 synthesized from non-magnetic coal fly ash (NMFA) and then loaded with Pd by impregnation method for the synthesis of Pd/IRFA@SiO2. Various surface analyses demonstrated that amorphous SiO2 was well deposited on the surface of IRFA, providing a unique three-dimensionally structured SiO2 layer to suppress aggregation of IRFA and enhance dispersion of Pd nanoparticles. Pd/IRFA@SiO2 exhibited a significantly enhanced p-NP reduction than those of Pd/IRFA, Pd/Al2O3, and Pd/SiO2. Compared to other Pd- and metal-loaded catalysts, Pd/IRFA@SiO2 showed similar to 4000 x enhancements in k(obs-p-NP)/C-M (L min(-1) g(M)(-1), M = precious metals) values and similar to 3800 x increases in price-normalized k(obs-p-NP) values, indicating that Pd/IRFA@SiO2 is a highly efficient and cost-effective alternative catalyst. The catalyst was successfully recycled five times without significant leaching of Pd, Si, and heavy metals because of the magnetic property of Pd/IRFA@SiO2. The experimental results suggest the applicability of the surface-modified IRFA support for the development of novel magnetically recoverable catalysts without severe toxicity problems.
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