Photoelectrocatalytic degradation of sulfamethoxazole over S–Scheme Co3Se4/BiVO4 heterojunction photoanode: An experimental and density functional theory investigations

Yusuf, Tunde L.; Ogundare, Segun A.; Opoku, Francis; Mabuba, Nonhlangabezo

doi:10.1016/j.surfin.2022.102534

Cited by 7 publications

(1 citation statement)

References 93 publications

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“…The use of UV also showed positive effect for all the degradation processes. The use of UV has the advantages of being a simple addition to an operational process that can be optimized to improve energy efficiency and performance, with the ability to accelerate the formation of radicals [33]. The improvement in removal efficiency can be attributed to the application of UV radiation, which results in the formation of radical chlorine species and hydroxyl radicals through homolytic reactions of the ions present in the urine [34].…”

Section: Resultsmentioning

confidence: 99%

Experimental design for combined abatement of organic compounds present in urine

et al. 2023

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Organic compounds contained in urine, such as urea and creatinine, can compete with pharmaceuticals for the electro‐generated oxidants during electrochemical treatment. In addition, urine has a large amount of chloride ions, creating opportunities to produce chlorine and aqueous‐free chlorine species via electrolysis. The aim of the present study is to analyze artificial urine as a supporting electrolyte, while studying the removal of the organic components present (urea and creatinine) by employing an experimental design approach. A 2³ factorial design was employed to evaluate the efficiency of the photo‐assisted sonoelectrochemical (EC/UV/US) process. Operating conditions were optimized using response surface methodology (MRS), namely: 11.44 mL min−1 flow, 1.940 A at 160 min. The pH was analyzed and a predominance of HOCl (pH < 7.0) can be observed. Response surface methodology was used to investigate the effects and interactions of flow rate, time, and current to track the removal efficiency of organic compounds contained in artificial urine (TOC, creatinine, and urea). Over prolonged electrolysis, the EC/US/UV process achieved removal of TOC (25.7%), creatinine (68.2%), and urea (33.3%), due to the large contribution of highly reactive radical species (•OH, •Cl, ClO−).

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Section: Resultsmentioning

confidence: 99%

Experimental design for combined abatement of organic compounds present in urine

et al. 2023

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Charge Redistribution in Nise₂/Mos₂ n–n Heterojunction Towards the Photoelectrocatalytic Degradation of Ciprofloxacin

Yusuf,

Olatunde,

Masekela

et al. 2024

ChemElectroChem

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This study reports the photoelectrocatalytic (PEC) activity of a n–n heterojunction comprising MoS2 and NiSe2. The synthesis of the composite was achieved through a facile solvothermal method, yielding an exfoliated MoS2 layered sheet loaded with NiSe2 nanoparticles. Under visible light radiation and an external electric field, the obtained composite NiSe2/MoS2 exhibited enhanced catalytic activity for ciprofloxacin (CIP) degradation. The NiSe2/MoS2 heterojunction achieved about 78 % degradation efficiency with a first‐order kinetic rate of 0.0111 min−1, compared to 38 % efficiency and a first‐order kinetic rate of 0.0044 min−1 observed for MoS2. The NiSe2/MoS2 heterojunction was more advantageous due to the synergy of charge carrier induction by visible light radiation and improved charge carrier separation induced by the external electric field. The formation of n–n heterojunction at the interface of the two materials resulted in charge redistribution in the materials, with a simultaneous realignment of the band structure to achieve Fermi energy equilibration. The primary reactive species responsible for CIP degradation was identified as the photo‐induced h+. Furthermore, the catalyst exhibited high stability and reusability, with no significant reduction in activity observed after five experimental cycles. This study reveals the potential of exploring the synergy between the photocatalytic and electrocatalytic processes in removing harmful pharmaceutical compounds from water.

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Degradation of the Antibiotic Sulfamethoxazole by Ozonation: A Comprehensive Review

Martini,

Ighalo,

Emenike

et al. 2024

CleanMat

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Sulfamethoxazole (SMX) is an antibiotic widely used for the treatment of several diseases, especially respiratory and urinary. Due to its widespread use, its presence in the environment has been on the rise. This study discusses the degradation of the antibiotic SMX through the ozonation process. SMX is preferentially degraded by the direct action of O3 on the molecule, starting by breaking the double bonds in the aromatic ring. Through ozonation it is possible to obtain complete SMX degradation within 10 min, but the mineralization of the solution is not achieved, reaching total organic carbon removal efficiencies of 5%–60%, depending on the reaction time. Factors such as the presence of organic matter (OM) and the pH of the solution interfere with the degradation of SMX. The OM acts as a radical scavenger, decreasing the efficiency of degradation, while the pH interferes with the decomposition of O3 into radicals and the dissolution of the oxidant in the medium, in addition to influencing the state of ionization of the SMX making it more or less prone to reactions. In general, most other remediation processes are carried out on a laboratory scale. To increase the level of these processes to a full scale, more pilot‐scale studies are needed. In addition, it is necessary to focus on the practice of reusing materials, avoiding the generation of secondary pollution, and increasing the useful life of the material. The review also discusses the reaction mechanisms, intermediate compounds formed, mineralization of the solution, and factors that influence the process, which can help in making decisions for future studies to be carried out in the area. Prospects in the research area revolve around using metal–organic frameworks as molecular imprinting technology to modify heterogeneous catalysts, integration of external energy, bimetallic systems, and evaluation of deactivation mechanisms.

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Photoelectrocatalytic degradation of sulfamethoxazole over S–Scheme Co3Se4/BiVO4 heterojunction photoanode: An experimental and density functional theory investigations

Cited by 7 publications

References 93 publications

Experimental design for combined abatement of organic compounds present in urine

Experimental design for combined abatement of organic compounds present in urine

Charge Redistribution in Nise₂/Mos₂ n–n Heterojunction Towards the Photoelectrocatalytic Degradation of Ciprofloxacin

Degradation of the Antibiotic Sulfamethoxazole by Ozonation: A Comprehensive Review

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Photoelectrocatalytic degradation of sulfamethoxazole over S–Scheme Co3Se4/BiVO4 heterojunction photoanode: An experimental and density functional theory investigations

Cited by 7 publications

References 93 publications

Experimental design for combined abatement of organic compounds present in urine

Experimental design for combined abatement of organic compounds present in urine

Charge Redistribution in Nise2/Mos2 n–n Heterojunction Towards the Photoelectrocatalytic Degradation of Ciprofloxacin

Degradation of the Antibiotic Sulfamethoxazole by Ozonation: A Comprehensive Review

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Charge Redistribution in Nise₂/Mos₂ n–n Heterojunction Towards the Photoelectrocatalytic Degradation of Ciprofloxacin