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Rapid hydrodehalogenation of chlorinated benzoic acids using mechano-thermally prepared Raney alloy with enhanced kinetics
Authors: Hegedüs Michal | Gaborova Katarina | Weidlich Tomáš | Kalivoda Pavel | Briancin Jaroslav | Tothova Erika
Year: 2021
Type of publication: článek v odborném periodiku
Name of source: Journal of Environmental Chemical Engineering
Publisher name: ELSEVIER SCI LTD
Place: OXFORD
Page from-to: 105764
Titles:
Language Name Abstract Keywords
cze Rychlá hydrodehalogenace chlorovaných benzoových kyselin s použitím mechano-termicky připravené Raneyovy slitiny zahrnující rychlejší průběh hydrodehalogenačního procesu Práce srovnává účinek komerční Al-Ni slitiny s materiálem připraveným mechanotermickou cestou z výchozích práškových kovů. Připravený materiál bych charakterizován s pomocí XRD, velikosti částic a specifického povrchu a otestován. hydrodehalogenační reakce; chlorbenzoové kyseliny; herbicidy; mechanochemie; Al-Ni slitina; Raney nikl
eng Rapid hydrodehalogenation of chlorinated benzoic acids using mechano-thermally prepared Raney alloy with enhanced kinetics The present study reports on the degradation of chlorinated benzoic acids (CBAs), commonly present in the environment as pollutants, by a hydrodehalogenation reaction utilizing the Raney Al-Ni alloy (50:50 wt% Al:Ni). The hydrodehalogenation reaction using the Raney Al-Ni alloy has already been proven as an efficient tool for fast and efficient degradation of halogenated persistent organic pollutants (POPs). Herein, the nano-structured Raney Al-Ni alloy was prepared by an alternative mechano-thermal approach starting from pure elements in a form of powders. The prepared alloy was characterized by X-ray diffractometry, scanning electron microscopy, particle size distribution, and active surface area analyses. The properties of the material were compared with a commercial sample of the same alloy prepared by the atomization process. The activity of the synthesized alloy was evaluated as removal efficiency and a rate of dehalogenation of three different CBAs - 2-chlorobenzoic acid, 2,6-dichlorobenzoic acid, and 2,3,6-trichlorobenzoic acid (trysben); used in the past as an herbicide. Dehalogenation of all three tested CBAs yielded benzoic acid as the only product and followed the first-order reaction kinetics. Compared to the commercially available alloy, enhanced kinetics of CBAs removal was achieved, owing to the solid-state properties of the mechano-thermally prepared alloy. Hydrodehalogenation reaction; Chlorobenzoic acids; Herbicides; Mechanochemistry; Al-Ni alloy; Raney nickel

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