Palladium Nanoparticles Hosted on Hydrazine-Grafted Magnetite and Silica Particles to Catalyze the Reduction of Oxymetal Ions with Formic Acid

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• 作者：Komal C. Shrivastava ; Sankararao Chappa ; Dr. Arijit Sengupta ; Dr. Amit P. Srivastava ; Dr. Ashok K. Pandey and Prof. Dr. Karanam L. Ramakumar
• 刊名：ChemCatChem
• 出版年：2016
• 出版时间：September 21, 2016
• 年：2016
• 卷：8
• 期：18
• 页码：2981-2987
• 全文大小：1497K
• ISSN：1867-3899

文摘

A new synthetic route has been developed to anchor a large amount of Pd nanoparticles (NPs) on the surface of hydrazine-grafted and (3-glycidyloxypropyl)trimethoxysilane-coated inorganic host particles such as Fe₃O₄ and SiO₂. The hydrazine-grafted inorganic particles reduce Pd²⁺ ions spontaneously under ambient conditions. This results in the production of Pd⁰ seeds and their nucleation, which leads to the growth of Pd NPs on the surface of the host particle itself. These anchored Pd NPs on Fe₃O₄ and SiO₂ have been characterized by elemental analysis, microscopy, and elemental mapping. Spherical Pd NPs of ≈0.3 and 1 nm are formed uniformly on Fe₃O₄ (25 nm) and SiO₂ (100 nm) particles, respectively. Their concentration on the host particles was 12 mg g⁻¹ for Fe₃O₄ and 20 mg g⁻¹ for SiO₂. These host particles loaded with Pd NPs have been investigated for their catalytic activity in the reduction of representative oxymetal ions such as UO₂²⁺ and Cr₂O₇²⁻ ions with formic acid. NP-loaded SiO₂ exhibited a good catalytic activity in both these reductions, whereas Pd NPs on Fe₃O₄ could reduce Cr₂O₇²⁻ ions only.