Recent advances in structural modifications of photo-catalysts for organic pollutants degradation – A comprehensive review

Bisaria, Kavya; Sinha, Surbhi; Singh, Rachana; Iqbal, Hafiz M.N.

doi:10.1016/j.chemosphere.2021.131263

Cited by 99 publications

(32 citation statements)

References 285 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, water pollution is becoming increasingly prominent. Tons of stable and persistent organic dyes are discharged annually by the textile, dyeing, and paper industries. , This poses a risk to aquatic organisms and human beings. Hence, it is important to develop efficient dye treatment methods …”

Section: Introductionmentioning

confidence: 99%

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tao

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Organic dyes are ubiquitous pollutants in various aquatic environments as they are produced in abundance and used widely. In the present work, the degradation and mineralization of various organic dyes such as methylene blue (MB), methyl orange (MO), and rhodamine B (RhB), following the electron beam irradiation method in the presence of a graphitic carbon nitride/carbon nanodots/Fe(II) (CN/CD 3 /Fe 6 ) composite, were studied. The removal efficiency of MB reached 81.7% under conditions of electron beam irradiation (EBI) when the total irradiation dose was 5 kGy. This increased to 91.2% in the presence of the CN/CD 3 /Fe 6 composite. The mineralization efficiency increased from 30.1 to 47.3% when the composite was added, and the total irradiation dose was 20 kGy. The removal efficiency of organic dyes was not significantly affected in the pH range of 3–11. Results from cyclic experiments conducted using MB degradation indicated that the CN/CD 3 /Fe 6 composite exhibited good stability and reusability even after five irradiation cycles. Results from scavenging experiments revealed that • OH was the predominant reactive species during the MB degradation process. Intermediates produced in the synergistic system (EBI&CN/CD 3 /Fe 6 system) consisting of the CN/CD 3 /Fe 6 composite and EBI were detected using the liquid chromatography-mass spectrometry (LC-MS) technique. Based on the results, the possible degradation mechanism and pathways for MB were proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tao

et al. 2022

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Photocatalysts with desired band gap energy can effectively harvest sunlight with a decrease of electron and hole (e – –h + ) pair recombination rate to enhance photocatalysis reactions. − High reactive species (HRS) such as hydroxyl ( • OH), hydroperoxyl ( • O 2 H – ), and superoxide ( • O 2 – ) radicals could be formed during photocatalysis for oxidation of organic wastewater. , A superoxide radical is an important intermediate for photocatalytic H 2 O 2 generation that may form HRS (such as • OH and • O 2 H – radicals) for oxidation of organic pollutants in wastewater …”

Section: Introductionmentioning

confidence: 99%

“…9−13 High reactive species (HRS) such as hydroxyl ( • OH), hydroperoxyl ( • O 2 H − ), and superoxide ( • O 2 − ) radicals could be formed during photocatalysis for oxidation of organic wastewater. 14,15 A superoxide radical is an important intermediate for photocatalytic H 2 O 2 generation that may form HRS (such as • OH and • O 2 H − radicals) for oxidation of organic pollutants in wastewater. 16 Many semiconductors including TiO 2 , ZnO, and SnO 2 have been investigated for photocatalytic H 2 O-to-H 2 O 2 oxidation.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation

Wei

Liu

Wang

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Photocatalytic H 2 O 2 generation using unlimited solar energy for in situ oxidation of organic pollutants in wastewater has been environmentally attractive. Photocatalytic H 2 O-to-H 2 O 2(aq) reaction by BiVO 4 , however, suffered from relatively low yields (e.g., 24 μM h −1 ) under visible-light irradiation, mainly due to its high recombination rate of charge carriers. Herein, nanostructured NiCo 2 O 4 /BiVO 4 Z-scheme heterojunctions were prepared to increase the oxygen reduction reaction for a higher H 2 O 2 yield rate (than BiVO 4 by 16 times approximately). Additionally, highly reactive superoxide ( • O 2 − ) and hydroxyl ( • OH) radicals from the photocatalytic H 2 O-to-H 2 O 2 process enhanced oxidation of a representative organic pollutant (i.e., methylene blue) under visiblelight irradiation. The photocatalytic oxidation rate constant was as high as 2 × 10 −7 M −1 s −1 . This visible-light photocatalytic H 2 O-to-H 2 O 2 synchronized oxidation of an organic pollutant by the nanostructured NiCo 2 O 4 /BiVO 4 heterojunctions demonstrates the possibility for a potential energy self-sufficient organic wastewater treatment process.

show abstract

“…However, TiO 2 and ZnO are highly stable in colloidal suspension, therefore their separation and recovery after water treatment are complicated [ 22 ]. Many studies have been carried out to improve their photocatalytic activity; for instance, the incorporation of conductive metals (plasmonic structures, metal doping), graphene coating, heterojunction formation of two or more semiconductors, among others [ 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Poly(2-vinylpyridine) and Poly(4-vinylpyridine) with Metal Oxide (TiO2, ZnO) Films for the Photocatalytic Degradation of Methyl Orange and Benzoic Acid

et al. 2022

View full text Add to dashboard Cite

In this study, composite material films of pyridine-based polymer and metal oxides (ZnO and TiO2) were successfully deposited by spin coating method for environmental remediation. Firstly, the polymers poly(2-vinylpyridine) P(2-VP), and poly(4-vinylpyridine) P(4-VP) were synthesized via solution polymerization. The analysis by grazing incidence X-ray diffraction (GIXRD) reveals semicrystalline nature and scanning electron microscopy (SEM) indicates that the poly(vinylpyridines) clusters of particles were observed on the surface of the films. It was also shown that the morphology of composite materials is completely dependent on the chemical nature of the oxide. In the case of P(2-VP)-TiO2 and P(4-VP)-TiO2, some channels or pathways of TiO2 on the surface of films were observed. However, the surface morphology of the polymer composites formulated with ZnO shows a homogeneous distribution in P(2-VP) and P(4-VP) matrix. The effectiveness of the composite materials in the photodegradation of methyl orange (MO) was evaluated by photocatalysis. According to the results, the P(4-VP)-ZnO composite exhibited the highest photodegradation of MO, allowing the separation of photogenerated species required for the photocatalytic reaction. The P(4-VP)-ZnO composite was also tested in benzoic acid (BA) photodegradation in water. The presence of some scavengers in the reaction system reveals that hydroxyl radicals (OH•), superoxide radicals (O2-•) and holes (h+) are responsible for the BA reduction by photocatalysis.

show abstract

Recent advances in structural modifications of photo-catalysts for organic pollutants degradation – A comprehensive review

Cited by 99 publications

References 285 publications

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation

Synthesis and Characterization of Poly(2-vinylpyridine) and Poly(4-vinylpyridine) with Metal Oxide (TiO2, ZnO) Films for the Photocatalytic Degradation of Methyl Orange and Benzoic Acid

Contact Info

Product

Resources

About

Recent advances in structural modifications of photo-catalysts for organic pollutants degradation – A comprehensive review

Cited by 99 publications

References 285 publications

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

Nanostructured NiCo2O4/BiVO4 Heterojunctions for Visible-Light Photocatalytic H2O-to-H2O2 Synchronized Organic Pollutant Oxidation

Synthesis and Characterization of Poly(2-vinylpyridine) and Poly(4-vinylpyridine) with Metal Oxide (TiO2, ZnO) Films for the Photocatalytic Degradation of Methyl Orange and Benzoic Acid

Contact Info

Product

Resources

About

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation