Visible light driven photoelectrocatalysis on a FTO/BiVO4/BiOI anode for water treatment involving emerging pharmaceutical pollutants

Orimolade, Benjamin O.; Koiki, Babatunde A.; Peleyeju, Moses G.; Arotiba, Omotayo A.

doi:10.1016/j.electacta.2019.03.217

Cited by 91 publications

(31 citation statements)

References 45 publications

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“…The assembled electrochemical cell was controlled by a potentiostat/galvanostat PGSTAT 302N Autolab (Ultrech, Ultrech, Netherland) operated using the software NOVA 1.11.1 and equipped with BOOSTER10A module Autolab The combination of photocatalytic and electrolytic processes is referred to as photoelectrocatalysis (PEC). The PEC technique is a promising electrochemical advanced oxidative process (EAOP) regarded suitable for the degradation of organic pollutants present in environmental samples [21,22]. Electrochemical advanced oxidative processes (EAOPs) are found to have superior advantages over advanced oxidative processes (AOPs) in the sense that, unlike the latter, the EAOPs do not require the use of reagent oxidant compounds-such as chlorine [23], ozone [24], or hydrogen peroxide [25]-which tend to increase the total volume of the substances under treatment.…”

Section: Apparatusmentioning

confidence: 99%

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

et al. 2020

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The present work reports the degradation of 4-nitrophenol using BiVO4/CuO hybrid material synthesized by the precipitation of BiVO4 in the presence of CuO. Morphological and structural characterizations were performed using X-ray diffraction and scanning electronic microscopy coupled to energy dispersive X-ray spectroscopy. Through the calculation of the Kubelka–Munk function applied to diffuse reflectance spectrophotometry data, the hybrid material presented absorption edge of 1.85 eV. The formation of p-n heterojunction between BiVO4 and CuO renders the hybrid material suitable for the construction of a photoanode employed in hydroxyl radical generation. UV–vis spectrophotometry and high-performance liquid chromatography experiments were performed in order to monitor the degradation of 4-nitrophenol and the formation of secondary products. Additional information regarding the hybrid material was obtained through ion chromatography and total organic carbon analyses. The application of BiVO4/CuO-based photocatalyzer led to a 50.2% decrease in total organic carbon after the degradation of 4-nitrophenol. Based on the results obtained in the study, BiVO4/CuO has proved to be a promising material suitable for the removal of recalcitrant compounds in water treatment plants.

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Section: Apparatusmentioning

confidence: 99%

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

et al. 2020

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“…Pollutant degradation in water dramatically increases when semiconductors are employed as photoanodes [2,17,18]. Unlike in slurry reactors, photocatalysts must be mounted on electricallyconducting surfaces.…”

Section: H Vbmentioning

confidence: 99%

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (EEO; kWh m−3 order−1 for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased EEO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher EEO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.

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“…A similar characterisation methods has been previously reported 13 . electrochemical and photoelectrochemical experiments. The electrochemical and photoelectrochemical experimental protocols are similar to that described in our previous reports 8,43 . Photocurrent measurements, linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were performed on an Autolab PGSTAT204 (Netherlands) potentiostat/galvanostat.…”

mentioning

confidence: 96%

“…The binary photoanode with p-n heterojunction was fabricated through a two-step electrodeposition and Successive Ion Layer Adsorption/Reaction methods. First, BiVO 4 were electrodeposited on a FTO glass (5 cm × 1.3 cm × 0.22 cm, surface resistivity of ~7 Ω/sq) using a modified previously documented electrodeposition technique 34,43 . Summarily, from a well sonicated precursor solution containing 0.49 g Bi(NO 3 ) 3 ·5H 2 O, 1.66 g KI in 25 mL and 0.23 M p-benzoquinone maintained at pH 4.3, films of BiOI were first potentiostatically electrodeposited onto a clean FTO glass at −0.13 V for 720 s. FTO glass, platinum wire and Ag/AgCl (3.0 M KCl) electrode were employed as the working electrode, counter electrode and reference electrode respectively.…”

mentioning

confidence: 99%

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Orimolade

Arotiba

2020

Sci Rep

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Pharmaceuticals have been classified as emerging water pollutants which are recalcitrant in nature. In the quest to find a suitable technique in removing them from contaminated water, photoelectrocatalytic oxidation method has attracted much attention in recent years. this report examined the feasibility of degrading ciprofloxacin and sulfamethoxazole through photoelectrocatalytic oxidation using fto-BiVo 4 /Ag 2 S with p-n heterojunction as anode. BiVo 4 /Ag 2 S was prepared through electrodeposition and successive ionic layer adsorption/reaction on fto glass. Structural and morphological studies using XRD, SEM, EDS and diffusive reflectance UV-Vis confirmed the successful construction of p-n heterojunction of BiVo 4 /Ag 2 S. electrochemical techniques were used to investigate enhanced charge separation in the binary electrode. the fto-BiVo 4 /Ag 2 S electrode exhibited the highest photocurrent response (1.194 mA/cm −2 ) and longest electron lifetime (0.40 ms) than both pristine BiVo 4 and Ag 2 S electrodes which confirmed the reduction in recombination of charge carriers in the electrode. Upon application of the prepared FTO-BiVO 4 /Ag 2 S in photoelectrocatalytic removal of ciprofloxacin and sulfamethoxazole, percentage removal of 80% and 86% were achieved respectively with a low bias potential of 1.2 V (vs Ag/AgCl) within 120 min. The electrode possesses good stability and reusability. the results obtained revealed BiVo 4 /Ag 2 S as a suitable photoanode for removing recalcitrant pharmaceutical molecules in water. open Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-wwww.nature.com/scientificreports www.nature.com/scientificreports/ the BiOI electrode. The electrode was subsequently placed in a furnace at 420 °C for 1 h. Finally, excess V 2 O 5 was washed off from the electrode by soaking it in 1.0 M NaOH solution for 40 min. The resulting BiVO 4 /FTO electrode was thoroughly washed with deionized water and dried at room temperature. In order to obtain BiVO 4 / Ag 2 S electrode, the prepared FTO/BiVO 4 was dipped in a 0.3 M AgNO 3 solution for 10 s and followed by immersion in 0.3 M Na 2 S for 10 s. The cycle was repeated ten times and the obtained electrode was rinsed with deionized water and air dried at room temperature for 24 h. Scientific RepoRtS |(2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ conclusion A photoanode of BiVO 4 /Ag 2 S with p-n heterojunction was successful prepared through electrodeposition and successive ionic layer adsorption/reaction method on FTO glass. The construction of p-n heterojunction reduced the common problem of rapid recombination of photogenerated electron-hole pairs. This was confirmed through the photocurrent response of BiVO 4 /Ag 2 S (1.194 mA/cm −2 ) which was higher than both pristine BiVO 4 (0.802 mA/cm −2 ) and...

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Visible light driven photoelectrocatalysis on a FTO/BiVO4/BiOI anode for water treatment involving emerging pharmaceutical pollutants

Cited by 91 publications

References 45 publications

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

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