Investigation of mechanism and kinetics in the TiO2 photocatalytic degradation of Indigo Carmine dye using radical scavengers

Neto, João Soares; Satyro, Suéllen; Saggioro, Enrico Mendes; Dezotti, Márcia

doi:10.1007/s13762-020-02842-6

Cited by 31 publications

(8 citation statements)

References 30 publications

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“…Photocatalytic degradation of organic contaminants entails photoexcitation, migration and separation of charges and oxidation‐reduction reactions on the surface of the catalyst. Photogenerated reactive radicals such as ⋅OH, e − , h + and O 2 .− are capable of degrading a variety of organic compounds [72] . In order to investigate the effect of scavengers for ⋅OH, e − , h + and O 2 .− reactive radicals, a number of trapping scavengers such as iso‐propyl alcohol, AgNO 3 , ascorbic acid and acrylamide were studied.…”

Section: Resultsmentioning

confidence: 99%

“…Photogenerated reactive radicals such as * OH, e À , h + and O 2 *À are capable of degrading a variety of organic compounds. [72] In order to investigate the effect of scavengers for * OH, e À , h + and O 2 *À reactive radicals, a number of trapping scavengers such as iso-propyl alcohol, AgNO 3 , ascorbic acid and acrylamide were studied. Iso-propyl alcohol was used to trap * OH, AgNO 3 was used to scavenge e À , ascorbic acid was used to trap h + and acrylamide was used to trap O 2 *À .…”

Section: The Effect Of Scavengersmentioning

confidence: 99%

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CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

et al. 2022

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In this study, graphitic carbon nitride was used as a support for CuO/TiO 2 nanocomposite and was used for the photodegradation of ketoprofen (KP) in various water qualities. The formation of the CuO/TiO 2 @GCN nanocomposites was proven using different characterization methods. PXRD and Raman analyses of TiO 2 and CuO/TiO 2 showed that the composite peaks shifted relative to those of TiO 2 , showing interactions between the two materials. The morphology of CuO/TiO 2 @GCN consisted of CuO/TiO 2 nanoparticles on the surface of the mat-like GCN. CuO/TiO 2 @GCN had a narrower band gap and its photo-luminescence emission peak was lower than of TiO 2 . CuO/ TiO 2 @GCN was found to be the best performing photocatalyst that could be used over 3 cycles without major loss in activity. Also, the material was shown to be able to photocatalyze KP in groundwater. The by-products of the photodegradation were identified by LC-MS. The electrical energy consumed for this process was 2.66E5 kWh/m 3 . The superior photocatalytic efficiency of CuO/TiO 2 @GCN relative to TiO 2 was attributed to the increased charged separation and that light of higher wavelength was harvested.

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Section: Resultsmentioning

confidence: 99%

Section: The Effect Of Scavengersmentioning

confidence: 99%

CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

et al. 2022

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“…This was due to the instability of the aromatic groups present in the IC structure in basic medium. The NH groups present in the structure can be easily deprotonated in the presence of excess of OH ¯ (basic medium), thus generating another structure which is more susceptible for attack [ 121 ] (Figure ES5 (supporting information)). Thus, because of such structural changes, higher degradation of IC was observed at high pH values (basic medium).…”

Section: Resultsmentioning

confidence: 99%

Synergistically enhanced solar light‐driven degradation of hazardous food colorants by ultrasonically derived MgFe₂O₄/S‐doped g‐C₃N₄ nanocomposite: A Z‐scheme system‐based heterojunction approach

Pratibha

Rajput

2022

Applied Organom Chemis

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Magnesium ferrite/sulfur‐doped graphitic nitride (MFO/SCNNS) heterostructure has been developed via sonication‐assisted deposition of zero‐dimensional MFO over the surface of two‐dimensional SCN nanosheets. Additionally, the prepared nanocomposite material has been characterized by several analytical characterization techniques including XRD, Fourier transform infrared (FT‐IR), high‐resolution transmission electron microscopy (HR‐TEM), selected‐area electron diffraction (SAED), energy‐dispersive spectrometry (EDS), Brunauer–Emmett–Teller (BET), vibrating sample magnetometer (VSM), UV–Vis. spectroscopy, electron spin resonance(ESR), and X‐ray photoelectron spectroscopy (XPS) which indicated the existence of strong interfacial interactions via heterojunction formation between MFO and SCNNS. The as prepared nanocomposite, especially MFO:SCNNS (1:1) (having 1:1 mass ratio of MFO to SCNNS), offered impressive photo‐response for the complete degradation of Erythrosine B and Indigo Carmine within 30 min under direct solar light irradiation. The enhanced photoactivity of the MFO:SCNNS (1:1) was also confirmed by the photoluminescence, photocurrent and electrochemical impedance spectroscopy. The Mott–Schottky analysis also depicts the formation of p‐n heterojunction at the interface of MFO and SCNNS, responsible for the enhanced photoactivity. Additionally, the degradation process has also been studied using mass spectrometry, UV–Vis, and ESR spectral analysis. The trapping experiments were also conducted to confirm the formation of active radical species during the photodegradation reaction. Furthermore, the nanocomposite photocatalytic material offered excellent stability and reusability and thus can serve as an effective candidate for environmental remediation application such as real waste water treatment.

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“…Eight targeted scavengers were used (Figure 5D), including ethanol and tert-butanol (TBA) for hydroxyl radicals ( * OH), superoxide dismutase (SOD) for superoxide anion radicals ( * O 2 À ), histidine and triethylenediamine (DABCO) for singlet oxygen ( 1 O 2 ), potassium iodide for holes, [35,36] and potassium bromate for photoelectrons formed after the photoelectron leap. [37,38] Addition of ethanol and TBA caused inhibition of L-DOPA formation.…”

Section: Catalytic Mechanism Of Nanozymementioning

confidence: 99%

Fe₃O₄/g‐C₃N₄ Nanozyme for Production of L‐DOPA as Mimetics of Tyrosine Hydroxylase

et al. 2022

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L-DOPA is in large demand as the mainstay of therapeutic treatment for Parkinson's disease. The development of a facile route is urgently required for production of L-DOPA. A nanozyme was developed for biomimetic synthesis of L-DOPA by mimicking natural tyrosine hydroxylase. Fe 3 O 4 /g-C 3 N 4 nanocomposite was fabricated by introducing iron oxide into g-C 3 N 4 nanosheets. Formation of FeÀ N bonds with structure resembled the active center. The nanozyme possessed superparamagnetic characteristics and wide light response range. The nanozyme exhibited similar activity as tyrosine hydroxylase by catalyzing hydroxylation of tyrosine in the presence of visible light irradiation and hydrogen peroxide. Maximum yield and titer was obtained as 15% and 1 mM for production of L-DOPA, respectively. The nanozyme demonstrated high stability and reusability. The nanozyme catalyzed the reaction in an analogous mechanism with Fe IV O 2 + as the dominant active species. It might provide a promising insight to produce L-DOPA due to advantages of easy separation and mild conditions.

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Investigation of mechanism and kinetics in the TiO2 photocatalytic degradation of Indigo Carmine dye using radical scavengers

Cited by 31 publications

References 30 publications

CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

Synergistically enhanced solar light‐driven degradation of hazardous food colorants by ultrasonically derived MgFe₂O₄/S‐doped g‐C₃N₄ nanocomposite: A Z‐scheme system‐based heterojunction approach

Fe₃O₄/g‐C₃N₄ Nanozyme for Production of L‐DOPA as Mimetics of Tyrosine Hydroxylase

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Investigation of mechanism and kinetics in the TiO2 photocatalytic degradation of Indigo Carmine dye using radical scavengers

Cited by 31 publications

References 30 publications

CuO‐doped TiO2 Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

CuO‐doped TiO2 Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

Synergistically enhanced solar light‐driven degradation of hazardous food colorants by ultrasonically derived MgFe2O4/S‐doped g‐C3N4 nanocomposite: A Z‐scheme system‐based heterojunction approach

Fe3O4/g‐C3N4 Nanozyme for Production of L‐DOPA as Mimetics of Tyrosine Hydroxylase

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CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

CuO‐doped TiO₂ Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation

Synergistically enhanced solar light‐driven degradation of hazardous food colorants by ultrasonically derived MgFe₂O₄/S‐doped g‐C₃N₄ nanocomposite: A Z‐scheme system‐based heterojunction approach

Fe₃O₄/g‐C₃N₄ Nanozyme for Production of L‐DOPA as Mimetics of Tyrosine Hydroxylase