Hydrodechlorination of Different Chloroaromatic Compounds at Room Temperature and Ambient Pressure-Differences in Reactivity of Cu- and Ni-Based Al Alloys in an Alkaline Aqueous Solution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916603" target="_blank" >RIV/00216275:25310/20:39916603 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2073-4344/10/9/994" target="_blank" >https://www.mdpi.com/2073-4344/10/9/994</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/catal10090994" target="_blank" >10.3390/catal10090994</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hydrodechlorination of Different Chloroaromatic Compounds at Room Temperature and Ambient Pressure-Differences in Reactivity of Cu- and Ni-Based Al Alloys in an Alkaline Aqueous Solution

Popis výsledku v původním jazyce

It is well known that the hydrodechlorination (HDC) of chlorinated aromatic contaminants in aqueous effluents enables a significant increase in biodegradability. HDC consumes a low quantity of reactants producing corresponding non-chlorinated and much more biodegradable organic compounds. Two commonly used precious metals free Al alloys (Raney Al-Ni and Devarda&apos;s Al-Cu-Zn) were compared in reductive action in an alkaline aqueous solution. Raney Al-Ni alloy was examined as a universal and extremely effective HDC agent in a diluted aqueous NaOH solution. The robustness of Raney Al-Ni activity is illustrated in the case of HDC of polychlorinated aromatic compounds mixture in actual waste water. In contrast, Devarda&apos;s Al-Cu-Zn alloy was approved as much less active for HDC of the tested chlorinated aromatic compounds, but with a surprisingly high selectivity on cleavage of C-Cl bonds in the meta and sometimes the ortho position in chlorinated aniline and sometimes chlorinated phenol structures. The reaction of both tested alloys with chlorinated aromatic compounds in the aqueous NaOH solution is accompanied by dissolution of aluminum. Dissolved Al in the alkaline HDC reaction mixture is very useful for subsequent treatment of HDC products by coagulation and flocculation of Al(OH)(3) caused by simple neutralization of the alkaline aqueous phase after the HDC reaction.

Název v anglickém jazyce

Hydrodechlorination of Different Chloroaromatic Compounds at Room Temperature and Ambient Pressure-Differences in Reactivity of Cu- and Ni-Based Al Alloys in an Alkaline Aqueous Solution

Popis výsledku anglicky

It is well known that the hydrodechlorination (HDC) of chlorinated aromatic contaminants in aqueous effluents enables a significant increase in biodegradability. HDC consumes a low quantity of reactants producing corresponding non-chlorinated and much more biodegradable organic compounds. Two commonly used precious metals free Al alloys (Raney Al-Ni and Devarda&apos;s Al-Cu-Zn) were compared in reductive action in an alkaline aqueous solution. Raney Al-Ni alloy was examined as a universal and extremely effective HDC agent in a diluted aqueous NaOH solution. The robustness of Raney Al-Ni activity is illustrated in the case of HDC of polychlorinated aromatic compounds mixture in actual waste water. In contrast, Devarda&apos;s Al-Cu-Zn alloy was approved as much less active for HDC of the tested chlorinated aromatic compounds, but with a surprisingly high selectivity on cleavage of C-Cl bonds in the meta and sometimes the ortho position in chlorinated aniline and sometimes chlorinated phenol structures. The reaction of both tested alloys with chlorinated aromatic compounds in the aqueous NaOH solution is accompanied by dissolution of aluminum. Dissolved Al in the alkaline HDC reaction mixture is very useful for subsequent treatment of HDC products by coagulation and flocculation of Al(OH)(3) caused by simple neutralization of the alkaline aqueous phase after the HDC reaction.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Catalysts

ISSN

2073-4344

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

21

Strana od-do

994

Kód UT WoS článku

000581326700001

EID výsledku v databázi Scopus

2-s2.0-85093883743