The Sol–Gel Metal-Oxide Skeleton Affects the Catalytic Properties of In Situ Formed Metal Nanoparticles
Kavya Vidyadharan, Dan Meyerstein, Ariela Burg, Amir Mizrahi, Jennifer Strunk, Yael Albo
TL;DR
This study shows how different metal-oxide materials influence the performance of metal nanoparticles in breaking down harmful disinfection byproducts.
Contribution
The paper reveals how sol–gel matrices affect the catalytic activity of in situ formed metal nanoparticles in dehalogenation reactions.
Findings
SiO2 supports higher Cu0 activity in dechlorination compared to Al2O3 and TiO2.
Al2O3 enhances Ni0 reactivity more than SiO2 and TiO2 in similar reactions.
The sol–gel matrix significantly alters the reduction behavior of encapsulated metals.
Abstract
The interaction between the mesoporous metal-oxide matrix and the adsorbed/entrapped active metal species attracts attention and curiosity due to its critical role in defining catalytic performance. Herein, the effects of TiO2, Al2O3, and SiO2 sol–gel matrices on the catalytic properties of encapsulated Cu0 and Ni0 species catalyzing the dehalogenation of the hazardous disinfection byproducts, chloro and bromoacetic acids, are reported. A precatalyst approach is employed in which a matrix is prepared by incorporating M(II) species into the pores of the sol–gel, which are later reduced to the active catalyst, M(0), during the reduction reaction by BH4 –. The synthesized precatalysts are thoroughly studied using BET isotherms, X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results point out that the relative effect of the…
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Taxonomy
TopicsEnvironmental remediation with nanomaterials · Catalytic Processes in Materials Science · Water Treatment and Disinfection