Interrogating solar photoelectrocatalysis on an exfoliated graphite–BiVO<sub>4</sub>/ZnO composite electrode towards water treatment

Orimolade, Benjamin O.; Koiki, Babatunde A.; Zwane, Busisiwe N.; Peleyeju, Moses G.; Mabuba, Nonhlangabezo; Arotiba, Omotayo A.

doi:10.1039/c9ra02366f

Cited by 48 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of heterojunction of BiVO 4 with other suitable semiconductor has proven to be an efficient method for promoting charge separation within BiVO 4 photoanodes. Hence, heterostructures of photoanodes of BiVO 4 /Bi 2 O 3 23 , BiVO 4 /ZnO 24 , BiVO 4 /Ag 2 S 25 , BiVO 4 /Ag 3 PO 4 26 , and BiVO 4 /WO 3 27 have shown better PEC efficiency than pristine BiVO 4 photoanode.…”

Section: Introductionmentioning

confidence: 95%

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Orimolade

Arotiba

2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

We report the photoelectrocatalysis of diclofenac sodium using a reactor consisting of Ag-BiVO4/BiOI anode and Ag-BiOI cathode. The electrodes were prepared through electrodeposition on FTO glass and modified with Ag nanoparticles through photodeposition. The structural and morphological studies were carried out using XRD, SEM, and EDS which confirmed the successful preparation of the materials. The optical properties as observed with UV-DRS revealed that the electrodes were visible light active and incorporation of metallic Ag particles on the surface increased the absorption in the visible light region. Presence of p-n heterojunction in the anode led to decrease in the spontaneous recombination of photoexcited electron–hole pairs as seen in the photocurrent response. The results from photoelectrocatalytic degradation experiments revealed that replacing platinum sheet with Ag-BiOI as counter electrode resulted in higher (92%) and faster removal of diclofenac sodium as evident in the values of apparent rate constants. The reaction mechanism further revealed that efficiently separated photogenerated holes played a major role in the degradation of the pharmaceutical. The prepared electrodes showed good stability and impressive reusability. The reports from this study revealed that the dual photoelectrodes system has a great potential in treating pharmaceutical polluted wastewater using visible light irradiation.

show abstract

Section: Introductionmentioning

confidence: 95%

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Orimolade

Arotiba

2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The efficiency of the process from an energy point of view is an aspect that requires further studies in view of a hypothetical full-scale application. Recently, the use of solar energy has been proposed as an alternative to UV lamps in PEC technology (Kushwaha et al 2016 ; Orimolade et al 2019 ; Zhou et al 2020 ; Adak et al 2020 ). Although this solution would require longer irradiation times (and therefore a greater volume of reactors), it would considerably limit the costs of water treatment thanks to the exploitation of the energy naturally present.…”

Section: Conclusion and Future Outlooksmentioning

confidence: 99%

Photoelectrocatalysis on TiO2 meshes: different applications in the integrated urban water management

Collivignarelli

Abbà

Miino

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Recently, among AOPs, photoelectrocatalysis (PEC) on TiO2 is gaining interest. In this study, five different real waters sampled in four different points of the integrated urban water management (IUWM) system were tested with PEC and UV alone, for comparison. This work aims to verify the effect of the PEC suggesting the optimal position in IUWM system where the PEC should be located to obtain the best performance. In groundwaters (GWs), PEC effectively removed atrazine-based compounds (> 99%), trichloroethylene, and perchloroethylene (96%), after 15 min of reaction time. However, given the low concentrations of emerging compounds, the synergistic effect of UV radiation with the catalyst and with the polarization of the mesh was not visible, with very few differences compared with the results obtained with UV alone. Pharmaceutical industrial wastewater (IWW) showed a significant increase in biodegradability after 2 h, both if subjected to PEC or UV (200%), despite the absence of COD removal. The PEC applied on IWW from a sewage sludge treatment plant allowed to effectively remove the COD (39.6%) and increase the biodegradability (300%). Good results in terms of COD removal (33.9%) and biodegradability increase (+900%) were also achieved testing PEC on wastewater treatment plant effluent. Except for GWs, PEC allowed significant EEO savings respect to UV alone (76.2–99.1%).

show abstract

“…The above works motivates this paper, where silver nanoparticles were composited with exfoliated graphite (EG) for the fabrication of an electrochemical sensor for BPA detection. EG, possessing properties such as high electrical conductivity and electron transport, mechanical strength, and high surface area, has made a niche for itself as a suitable candidate for various applications, particularly as a substrate in electrochemistry. − With compressibility and mechanical strength, EG can be easily compacted into a working electrode that allows surface regeneration by polishing on emery paper, as a way of tackling fouling. Based on these inherent properties of both EG and AgNPs, as well as the motivation from the above works, we report the use of an AgNPs-EG nanocomposite-based electrode for the development of an electrochemical sensor for BPA detection in thermal paper samples.…”

Section: Introductionmentioning

confidence: 99%

A Silver-Loaded Exfoliated Graphite Nanocomposite Anti-Fouling Electrochemical Sensor for Bisphenol A in Thermal Paper Samples

et al. 2021

Self Cite

View full text Add to dashboard Cite

Silver nanoparticles (AgNPs) were synthesized separately and loaded onto the expanded layers of exfoliated graphite (EG) to form a silver nanoparticle-exfoliated graphite nanocomposite (AgNPs-EG). The AgNPs-EG was compressed into a pellet (0.6 cm in diameter) and used to prepare an electrochemical sensor for bisphenol A (BPA) in standard samples and in thermal paper. The synthesized materials were characterized by ultraviolet–visible spectrophotometry, X-ray diffraction spectroscopy, scanning electron microscopy, and energy-dispersive X-ray. The electrochemical behavior of BPA on the AgNPs-EG sensor was investigated by cyclic voltammetry and square wave voltammetry. Under optimized experimental conditions, the oxidation peak current was linearly proportional to bisphenol A concentrations in the range from 5.0 to100 μM, with a coefficient of determination ( R 2 ) of 0.9981. The obtained limit of detection of the method was 0.23 μM. The fabricated sensor was able to overcome electrode fouling with good reproducibility (RSD = 2.62%, n = 5) by mechanical polishing of the electrode on emery paper. The proposed method was successfully applied to determine bisphenol A in thermal paper samples and demonstrated good accuracy of 93.1 to 113% recovery.

show abstract

Interrogating solar photoelectrocatalysis on an exfoliated graphite–BiVO₄/ZnO composite electrode towards water treatment

Abstract: Band alignment between ZnO and BiVO4 on exfoliated graphite (EG) support.

Cited by 48 publications

References 47 publications

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Photoelectrocatalysis on TiO2 meshes: different applications in the integrated urban water management

A Silver-Loaded Exfoliated Graphite Nanocomposite Anti-Fouling Electrochemical Sensor for Bisphenol A in Thermal Paper Samples

Contact Info

Product

Resources

About

Interrogating solar photoelectrocatalysis on an exfoliated graphite–BiVO4/ZnO composite electrode towards water treatment

Abstract: Band alignment between ZnO and BiVO4 on exfoliated graphite (EG) support.

Cited by 48 publications

References 47 publications

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Enhanced photoelectrocatalytic degradation of diclofenac sodium using a system of Ag-BiVO4/BiOI anode and Ag-BiOI cathode

Photoelectrocatalysis on TiO2 meshes: different applications in the integrated urban water management

A Silver-Loaded Exfoliated Graphite Nanocomposite Anti-Fouling Electrochemical Sensor for Bisphenol A in Thermal Paper Samples

Contact Info

Product

Resources

About

Interrogating solar photoelectrocatalysis on an exfoliated graphite–BiVO₄/ZnO composite electrode towards water treatment