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Keywords = borovanadate

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14 pages, 3172 KB  
Article
Photocatalytic Properties and Chemical Durability of CaO-B2O3-V2O5 Borovanadate Glasses
by Ayoub Kaaouass, Abdelkader Ben Ali, Hassan Ait Ahsaine, Ghizlaine Kaichouh, Abdelkader Zarrouk and Mohamed Saadi
Catalysts 2023, 13(3), 512; https://doi.org/10.3390/catal13030512 - 2 Mar 2023
Cited by 15 | Viewed by 3481
Abstract
The aim of this paper is to investigate the photocatalytic properties and chemical durability of the CaO-B2O3-V2O5 glasses system. The latter were synthesized by the melt-quenching technique. The amorphous nature of the prepared borovanadate glasses has [...] Read more.
The aim of this paper is to investigate the photocatalytic properties and chemical durability of the CaO-B2O3-V2O5 glasses system. The latter were synthesized by the melt-quenching technique. The amorphous nature of the prepared borovanadate glasses has been confirmed with X-ray diffraction. The chemical durability measured from their weights before and after immersion in deionized water and hydrochloric acid indicated that replacing V2O5 with B2O3 improved the chemical durability. The observed increases in chemical durability might be explained by the increase in the glass transition temperature, due to stronger bonding in the structural network. The photocatalytic performance was assessed by the degradation of methylene blue (MB) dye under irradiation, and the evolution of dye degradation was analyzed by UV-visible spectrometry. The vanadium content in the glass, the amount of catalyst, and the initial dye concentration showed a variable effect on the degradation of the MB dye. The photodegradation of methylene blue by the photocatalysts was found to follow pseudo-first-order rate kinetics. The photocatalytic activity for all the prepared photocatalysts showed a higher degradation performance, and the results indicated that 40 CaO-30 B2O3-30 V2O5 has the highest removal efficiency of about 99% in 180 min. Full article
(This article belongs to the Special Issue Catalytic Materials for Hazardous Wastewater Treatment)
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11 pages, 2679 KB  
Article
A New 3-D Open-Framework Zinc Borovanadate with Catalytic Potentials in α-Phenethyl Alcohol Oxidation
by Xinxin Liu, Biao Guo, Xuejiao Sun, Le Zhang and Hongming Yuan
Molecules 2019, 24(3), 531; https://doi.org/10.3390/molecules24030531 - 1 Feb 2019
Cited by 8 | Viewed by 3282
Abstract
A novel 3-D open-framework zinc borovanadate [Zn6(en)3][(VIVO)6(VVO)6O6(B18O36(OH)6)·(H2O)]2·14H2O (1, en = ethylenediamine) was hydrothermally obtained and [...] Read more.
A novel 3-D open-framework zinc borovanadate [Zn6(en)3][(VIVO)6(VVO)6O6(B18O36(OH)6)·(H2O)]2·14H2O (1, en = ethylenediamine) was hydrothermally obtained and structurally characterized. The framework was built from [V12B18O54(OH)6(H2O)]10− polyanion clusters bridged by Zn(en) complex fragments. The compound not only possessed a three-dimensional open-framework structure with unique plane-shaped channels, but also exhibited excellent catalytic activities for the oxidation of α-phenethyl alcohol. Full article
(This article belongs to the Special Issue Polyoxometalates and Polyoxometalate-Based Systems)
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