Cobalt-Substituted Heteropolyanion: Synthesis, Characterization, and Application to Oxidation of an Organic Dye in an Aqueous Medium

• Published in: Arabian journal for science and engineering (2011) Vol. 45; no. 6; pp. 4669 - 4681
• Main Authors: Bencedira, Selma, Bechiri, Ouahiba, Djenouhat, Meriem, Boulkra, Mohamed
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2020; Springer Nature B.V
• Subjects: Aqueous solutions; Catalysts; Catalytic activity; Catalytic oxidation; Chemical synthesis; Degradation; Dyes; Engineering; Heteropoly anions; Humanities and Social Sciences; Hydrogen peroxide; Infrared spectroscopy; multidisciplinary; NMR; Nuclear magnetic resonance; Oxidation; Research Article-Chemistry; Room temperature; Science; Substitutes; Ultraviolet radiation; UV radiation; Fuchsine acid; Catalytic oxidation; Green catalyst; H; Heteropolyanions; O
• ISSN: 2193-567X; 1319-8025; 2191-4281
• DOI: 10.1007/s13369-020-04392-y

The present work aimed to remove a toxic organic dye using a recyclable Dawson-type heteropolyanion as a green catalyst. Indeed, a novel molybdenum-substituted heteropolyanion HP 2 W 15 Mo 3 Co 2.5 O 62 ·20H 2 O was synthesized and characterized by EDX, IR, 31 P-NMR and cyclic voltammetry methods. Thereafter, the synthesized catalyst was used in the oxidation reaction of fuchsine acid (FA) by H 2 O 2 . As a result, the catalyst exhibited high catalytic activity in the degradation of FA at natural pH and room temperature. The catalytic oxidation efficiency as 97.97% was found after 120 min under catalyst mass of 0.001 g and H 2 O 2 concentration of 49 µM. By combining the used process with UV radiation at 365 nm, the FA oxidation time becomes three times lower than that seen in the presence of H 2 O 2 only. Moreover, ·OH involvement in dye degradation was confirmed and the H 2 O 2 activation mechanism using HP 2 W 15 Mo 3 Co 2.5 O 62 ·20H 2 O as catalyst was proposed. The stability of the recovered catalyst of the FA degradation has been confirmed by IR spectroscopy. Therefore, this study can provide an efficient green way of using cobalt catalyst for environmental remediation.