Electron acceptors effect on photocatalytic degradation of metformin under sunlight irradiation

Nezar, Sawsen; Laoufi, Nadia Aïcha

doi:10.1016/j.solener.2018.02.065

Cited by 42 publications

(6 citation statements)

References 46 publications

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“…The indirect generation of ROS in the presence of a hole may show a vital role in degrading both chemical and biological hazards. The dominant radical HO • , which can also be generated by the hole, is highly oxidative and responsible for MPs degradation …”

Section: Resultsmentioning

confidence: 99%

“…The dominant radical HO • , which can also be generated by the hole, is highly oxidative and responsible for MPs degradation. 41 To further identify the generation of these reactive species in this heterogeneous process, the EPR spectra were recorded to confirm the contributor of various reactive species by adding trapping agents like CPH, TEMPO, TEMP, and BMPO before and during solar irradiation (Figure 7), and the detail procedure is explained in Text S9. In the presence of FeS 2 @ GO catalyst and trapping agent, characteristic EPR signal showed a very lower intense signal for 1 O 2 and O 2…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Ahmed

Zhong

Wang

et al. 2022

Environ. Sci. Technol.

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The co-occurrence of various chemical and biological contaminants of emerging concerns has hindered the application of water recycling. This study aims to develop a heterogeneous photo-Fenton treatment by fabricating nano pyrite (FeS2) on graphene oxide (FeS2@GO) to simultaneously remove antibiotic resistant bacteria (ARB), antibiotic resistance genes (ARGs), and micropollutants (MPs). A facile and solvothermal process was used to synthesize new pyrite-based composites. The GO coated layer forms a strong chemical bond with nano pyrite, which enables to prevent the oxidation and photocorrosion of pyrite and promote the transfer of charge carriers. Low reagent doses of FeS2@GO catalyst (0.25 mg/L) and H2O2 (1.0 mM) were found to be efficient for removing 6-log of ARB and 7-log of extracellular ARG (e-ARG) after 30 and 7.5 min treatment, respectively, in synthetic wastewater. Bacterial regrowth was not observed even after a two-day incubation. Moreover, four recalcitrant MPs (sulfamethoxazole, carbamazepine, diclofenac, and mecoprop at an environmentally relevant concentration of 10 μg/L each) were completely removed after 10 min of treatment. The stable and recyclable composite generated more reactive species, including hydroxyl radicals (HO•), superoxide radicals (O2 • –), singlet oxygen (1O2). These findings highlight that the synthesized FeS2@GO catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of emerging contaminants.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Ahmed

Zhong

Wang

et al. 2022

Environ. Sci. Technol.

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“…Metformin an antidiabetic drug on of the common pharmaceutical pollutants typically found in hospital and domestic wastewater which has a profound effect on human health even at low concentrations. Nezar et al [ 143 ] had investigated degradation of metformin using Degussa catalyst combined with hydrogen peroxide an electron acceptor to improve the efficiency by trapping the electrons. The degradation of metformin was performed by sunlight irradiation.…”

Section: Applications Of Titania As Photocatalystmentioning

confidence: 99%

Nanocomposites containing titanium dioxide for environmental remediation

Alsheheri

2021

Designed Monomers and Polymers

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Titania is considered to be one of the most versatile material in its nanoform. Scientific community looks towards it to address various pressing global problems. One such problem is aquatic pollution arising from organic chemicals such as dyes, pesticides, antibiotics etc. due to industrial, domestic and agricultural activities. Titania proves to be very effective to address this problem owing to its superior photocatalytic properties. In this review, we will review the recent advances in titania-based nanocomposites. The recent advances discussed in this review include synthesis of titania, modification of titania, exploration of various supports such as silica, carbon, graphene etc., that is documented to enhance its environmental remediation properties.

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“…The choice of the oxidizer is important. Nezar and Laoufi (2018) compared the usage of H 2 O 2 , K 2 S 2 O 7 and Na 2 S 2 O 7 as electron acceptor (electron scavenger) for photocatalytic oxidation of metformin, with P25 TiO 2 ; they found that sodium persulfate (Na 2 S 2 O 7 ) produced the highest kinetic constants and efficiencies. For air and water detoxification, hydroxyl is the most important radical, mainly obtained from water molecules at active sites on the catalyst surface that is irradiated.…”

Section: Introductionmentioning

confidence: 99%

PHOTOCATALYTIC SOLAR OXIDATION OF ACESULFAME-K. EFFECT OF INITIAL pH, CATALYST DOSE AND OXIDANT CONCENTRATION

Mejía

2021

RICA

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Aqueous acesulfame-K was oxidized in a pilot solar photocatalytic reactor, equipped with a compound parabolic collector (CPC). The reactor has an area of 0.40 m2 of CPC collectors with geometrical concentration ratio of 1 and a simple mechanical configuration. The experiments of photocatalytic oxidation of acesulfame-K were performed by treating 2 L of water with an initial concentration of 15 mg/L. The photocatalyst used was P25 (Aeroxide TiO2) from Evonik. One of the goals of the research work was to find a set of conditions to efficiently remove this emerging concern pollutant. Results allowed proposing a set of reaction conditions that lead to a high removal of acesulfame-K. In addition, the experimental design allowed determining the effect of initial pH as well as the impact of initial concentrations of photocatalyst and chemical oxidant. The removal efficiency of acesulfame-K and related UV-absorbing species reached values up to 96-99 % and there was not a quantifiable amount of intermediate products (analyzed as UV absorbing species). Despite reaction time was fixed in 3 h for all the experiments, oxidation efficiencies higher than 95 % were reached at 2 h of reaction or even before.

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Electron acceptors effect on photocatalytic degradation of metformin under sunlight irradiation

Cited by 42 publications

References 46 publications

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Nanocomposites containing titanium dioxide for environmental remediation

PHOTOCATALYTIC SOLAR OXIDATION OF ACESULFAME-K. EFFECT OF INITIAL pH, CATALYST DOSE AND OXIDANT CONCENTRATION

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Electron acceptors effect on photocatalytic degradation of metformin under sunlight irradiation

Cited by 42 publications

References 46 publications

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS2@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS2@GO-Based Heterogeneous Photo-Fenton Process

Nanocomposites containing titanium dioxide for environmental remediation

PHOTOCATALYTIC SOLAR OXIDATION OF ACESULFAME-K. EFFECT OF INITIAL pH, CATALYST DOSE AND OXIDANT CONCENTRATION

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Product

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Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process