Bismuth vanadate-nanostructured graphite electrodes for Rhodamine B photoelectrochemical degradation
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2023-01-03
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Electrocatalysis is a promising way to treat water contaminated by harmful organic compounds. The combination of nanoparticles supported on a conductive substrate allows degradation to
occur under less energetic conditions. This work evaluated the effect of deposition of bismuth vanadate (BVO) particles on pencil-type graphite electrodes. BVO particles were obtained by ultrasonic
irradiation with coprecipitation. Then, they were deposited on the surface of a graphite electrode by
the impregnation method. A 2³
-design was used to optimize electrode fabrication. Matter Dispersion
Spectroscopy (SEM/EDS), X-Ray Diffraction (XRD) and Dynamic Light Scattering (DLS) were used
for characterization. Electrochemical characterization was performed by electrochemical impedance
spectroscopy (EIS) and cyclic voltammetry (CV). The results confirmed the synthesis of BVO@C
(BVO/graphite). Furthermore, BVO@C significantly increased the electroactive surface area of the
electrode, decreased the electron transfer resistance, and significantly increased the electron transfer
rate to a greater extent than the electrode without any modification. To prove that the performance
of BVO@C is better than the pure electrode, photoelectrocatalysis (PEC) and electrocatalysis (EC)
were performed in a rhodamine B (RhB) solution. The results showed that in 5 min of treatment with
unmodified electrode, BVO@C EC system and BVO@C PEC system, there was degradation of 31.53%,
46.09% and 58.17% respectively, reaching 95%, 98% and 99.64%, respectively, in 30 min. The reaction
rate constants were calculated and to be found k = 0.10272 m−¹ , k = 0.12221 m−¹ and k= 0.15022 m−¹
for the unmodified graphite, BVO@C EC System and BVO@C PEC system, respectively. These results
demonstrate that the BVO@C electrodes are efficient for application in a wide range of treatments,
including the treatment of organic pollutants.
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Dye degradation, Photoelectrocatalysis, Organic pollutants, Water remediation
Citação
ISECKE, Bruna Guimarães et al. Bismuth vanadate-nanostructured graphite electrodes for Rhodamine B photoelectrochemical degradation. Photochem, Basel, v. 3, n. 1, p. 38-58, 2023. DOI: 10.3390/photochem3010003. Disponível em: https://www.mdpi.com/2673-7256/3/1/3. Acesso em: 16 jun. 2023.