Nitrate is a ubiquitous contaminant commonly found in drinking water sources. Magnetic catalysts offer the possibility of rapidly eliminating nitrate without generating a secondary waste stream. Herein, we report on magnetically recoverable bimetallic Pd-In NPs which exhibit excellent chemical stability, reusability, and high nitrate removal efficiency. This four-component catalyst (Pd-In/Fe3O4@SiO2) contains nanocrystalline magnetite covered with a silica shell which supports indium-decorated palladium nanoparticles. The SiO2 shell suppresses Fe3O4 iron leaching and the bimetallic nano-domains maintains the nitrate reduction activity without obvious deactivation through multiple recycles. The observed reaction rate constants in deionized and simulated drinking waters were 5.8 and 1.3 L/min/gmetal, respectively. The strategy of immobilizing Pd-In catalysts with stable magnetic core is promising for the future development of recyclable and reusable catalysts for nitrate reduction.

Magnetically recyclable In-Pd catalysts for nitrate degradation

2019 Spring National Meeting

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