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Facet effect of hematite on the hydrolysis of phthalate esters under ambient humidity conditions
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Facet effect of hematite on the hydrolysis of phthalate esters under ambient humidity conditions
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Facet effect of hematite on the hydrolysis of phthalate esters under ambient humidity conditions
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Journal Article
Facet effect of hematite on the hydrolysis of phthalate esters under ambient humidity conditions
2022
Overview
Phthalate esters (PAEs) have been extensively used as additives in plastics and wallcovering, causing severe environmental contamination and increasing public health concerns. Here, we find that hematite nanoparticles with specific facet-control can efficiently catalyze PAEs hydrolysis under ambient humidity conditions, with the hydrolysis rates 2 orders of magnitude higher than that in water saturated condition. The catalytic performance of hematite shows a significant facet-dependence with the reactivity in the order {012} > {104} ≫ {001}, related to the atomic array of surface undercoordinated Fe. The {012} and {104} facets with the proper neighboring Fe-Fe distance of 0.34-0.39 nm can bidentately coordinate with PAEs, and thus induce much stronger Lewis-acid catalysis. Our study may inspire the development of nanomaterials with appropriate surface atomic arrays, improves our understanding for the natural transformation of PAEs under low humidity environment, and provides a promising approach to remediate/purify the ambient air contaminated by PAEs.
With a combined experimental and computational study, Jin et al. demonstrate that hematite nanoparticles can efficiently degrade phthalates under ambient humidity conditions, with a rate strongly dependent on the exposed facet via bidentate coordination involving neighbor Fe atoms, suggesting their possible use for indoor air purification
