Doping of silver vanadate and silver tungstate nanoparticles for enhancement the photocatalytic activity of MIL-125-NH2 in dye degradation

[Display omitted] •A new strategy for enhancing the photocatalytic activity of MIL-125-NH2 was presented by doping of Ag3VO4 and Ag2WO4 NPs.•After doping of Ag2WO4 and Ag3VO4 NPs, the band gap was reduced to 2.56 and 2.27 eV, respectively.•Ag3VO4@MIL-125-NH2 showed the highest photocatalysis and acc...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2019-10, Vol.383, p.111986, Article 111986
Main Authors: Emam, Hossam E., Ahmed, Hanan B., Gomaa, Eslam, Helal, Maher H., Abdelhameed, Reda M.
Format: Article
Language:English
Subjects:
Ag2WO4
Ag3VO4
Catalytic activity
Composite materials
Doping
Dye degradation
Dyes
Efficiency
Electron scavengers
Energy gap
Environmental degradation
Metal-organic frameworks
Methylene blue
Microcrystals
MIL-125-NH2
Nanoparticles
Photocatalysis
Photocatalysts
Photodegradation
Regeneration
Rhodamine
Silver
Titanium
Ultraviolet radiation
Vanadate
Vanadates
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Summary:[Display omitted] •A new strategy for enhancing the photocatalytic activity of MIL-125-NH2 was presented by doping of Ag3VO4 and Ag2WO4 NPs.•After doping of Ag2WO4 and Ag3VO4 NPs, the band gap was reduced to 2.56 and 2.27 eV, respectively.•Ag3VO4@MIL-125-NH2 showed the highest photocatalysis and accelerated the degradation rate of dye by factor of 2.1–4.9.•After 5 regeneration cycles, the photocatalytic efficiency of Ag3VO4@MIL-125-NH2 was decreased by only 31%. Recently, the increment in environmental pollution has challenged the investigation of photocatalytic systems. However, metal organic framework MOFs have superior photocatalytic action, it exhibits low efficiency of light energy because of their large effective band gap. Hence, the current study presents an innovative strategy for enhancing the photocatalytic activity of Ti-containing MOF (MIL-125-NH2) by doping of silver vanadate (Ag3VO4) and silver tungstate (Ag2WO4) nanoparticles. For the prepared composites, spherical nanoparticles of Ag3VO4 and Ag2WO4 were deposited on size regulated microcrystals of MIL-125-NH2. After doping of Ag2WO4 and Ag3VO4, the optical band gap of MIL-125-NH2 was decreased from 2.65 eV to 2.56 eV and 2.27 eV, respectively. The effect of doped nanoparticles on the photocatalysis of MIL-125-NH2 was monitored in the degradation reaction of Methylene Blue (MB) and Rhodamine B (RhB) dyes under UV and Visible light. The degradation of dyes (MB & RhB) was significantly enhanced by doping of nanoparticles. The rate of dye degradation (k1) was accelerated by factor of 1.6–2.1 and 2.1–4.9 due to doping of Ag2WO4 and Ag3VO4, respectively. Ag3VO4@MIL-125-NH2 exhibited the highest photocatalytic activity logically due to the lowest band gap. The efficiency of Ag3VO4@MIL-125-NH2 as photocatalyst was reduced by only 25.9–31 % after 5 regeneration cycles. The prepared composites are promising to apply as recyclable photocatalysts in the degradation of dyes in the sunlight, able to reuse for many cycles with substantial degradation efficiency.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2019.111986