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- Title
CdS-Based Hydrothermal Photocatalysts for Complete Reductive Dehalogenation of a Chlorinated Propionic Acid in Water by Visible Light.
- Authors
Milani, Martina; Mazzanti, Michele; Stevanin, Claudia; Chenet, Tatiana; Magnacca, Giuliana; Pasti, Luisa; Molinari, Alessandra
- Abstract
Cadmium sulfide (CdS)-based photocatalysts are prepared following a hydrothermal procedure (with CdCl2 and thiourea as precursors). The HydroThermal material annealed (CdS-HTa) is crystalline with a band gap of 2.31 eV. Photoelectrochemical investigation indicates a very reducing photo-potential of −0.9 V, which is very similar to that of commercial CdS. CdS-HTa, albeit having similar reducing properties, is more active than commercial CdS in the reductive dehalogenation of 2,2-dichloropropionic acid (dalapon) to propionic acid. Spectroscopic, electro-, and photoelectrochemical investigation show that photocatalytic properties of CdS are correlated to its electronic structure. The reductive dehalogenation of dalapon has a double significance: on one hand, it represents a demanding reductive process for a photocatalyst, and on the other hand, it has a peculiar interest in water treatment because dalapon can be considered a representative molecule of persistent organic pollutants and is one of the most important disinfection by products, whose removal from the water is the final obstacle to its complete reuse. HPLC-MS investigation points out that complete disappearance of dalapon passes through 2-monochloropropionic acid and leads to propionic acid as the final product. CdS-HTa requires very mild working conditions (room temperature, atmospheric pressure, natural pH), and it is stable and recyclable without significant loss of activity.
- Subjects
PROPIONIC acid; VISIBLE spectra; WATER disinfection; DEHALOGENATION; PERSISTENT pollutants; PHOTOCATALYSTS; THIOUREA
- Publication
Nanomaterials (2079-4991), 2024, Vol 14, Issue 7, p579
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano14070579