Comment on "Liquid-Gas Interface of Iron Aqueous Solutions and Fenton Reagents"

Agustín J Colussi; Shinichi Enami

doi:10.1021/acs.jpclett.2c01006

Comment on "Liquid-Gas Interface of Iron Aqueous Solutions and Fenton Reagents"

J Phys Chem Lett. 2022 Jul 28;13(29):6680. doi: 10.1021/acs.jpclett.2c01006. Epub 2022 Jul 18.

Authors

Agustín J Colussi¹, Shinichi Enami²

Affiliations

¹ California Institute of Technology, 1200 East California Blvd., Pasadena, California 91125, United States.
² National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan.

PMID: 35848766
DOI: 10.1021/acs.jpclett.2c01006

Abstract

A recent Letter in this Journal (Gladich et al. J. Phys. Chem. Lett. 13, 2994-3001) reported that photoelectron spectroscopy could not detect any products on the surface of aqueous Fe²⁺ jets dosed with gaseous hydrogen peroxide. The Letter however concluded that Fe(aq)²⁺ ions react with H₂O₂(g) at the water-vapor interface to produce the same Fe³⁺ + HO^• products as their reaction with H₂O₂(aq) in bulk water. We argue that this conclusion is untenable because nothing can be asserted about undetected species.