Generation of H2O2 by on-site activation of molecular dioxygen for environmental remediation applications: A review

Pi, Li; Jian-Hua, Cai; Xiong, Lili; Cui, Jiaxin; Hao, Hua; Tang, Daisheng; Mao, Xuhui

doi:10.1016/j.cej.2019.123420

Cited by 108 publications

(44 citation statements)

References 144 publications

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“…Other than the improvement of the electrical properties, carbon vacancies are beneficial for the generation of •O 2 − species, which functions as an important oxidant used in photodegradation reactions and H 2 O 2 production. [105][106][107] When amino groups appear along with carbon vacancies resulting from charge compensation, carbon vacancies allow stronger adsorption of O 2 on C v -g-C 3 N 4 via Lewis acid-base interaction between N atom of amino group and O 2 and easier electron transfer from C v -g-C 3 N 4 to O 2 to produce •O 2 − by ample photogenerated electrons. [47]…”

Section: Vacancies In 3d G-c 3 Nmentioning

confidence: 99%

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Putri

et al. 2021

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Graphitic carbon nitride (g‐C3N4) is a kind of ideal metal‐free photocatalysts for artificial photosynthesis. At present, pristine g‐C3N4 suffers from small specific surface area, poor light absorption at longer wavelengths, low charge migration rate, and a high recombination rate of photogenerated electron–hole pairs, which significantly limit its performance. Among a myriad of modification strategies, point‐defect engineering, namely tunable vacancies and dopant introduction, is capable of harnessing the superb structural, textural, optical, and electronic properties of g‐C3N4 to acquire an ameliorated photocatalytic activity. In view of the burgeoning development in this pacey field, a timely review on the state‐of‐the‐art advancement of point‐defect engineering of g‐C3N4 is of vital significance to advance the solar energy conversion. Particularly, insights into the intriguing roles of point defects, the synthesis, characterizations, and the systematic control of point defects, as well as the versatile application of defective g‐C3N4‐based nanomaterials toward photocatalytic water splitting, carbon dioxide reduction and nitrogen fixation will be presented in detail. Lastly, this review will conclude with a balanced perspective on the technical and scientific hindrances and future prospects. Overall, it is envisioned that this review will open a new frontier to uncover novel functionalities of defective g‐C3N4‐based nanostructures in energy catalysis.

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Section: Vacancies In 3d G-c 3 Nmentioning

confidence: 99%

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Putri

et al. 2021

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“…In such a redox cycle, • OH and HOO • species are generated (Equations (10)(11)). [19] Compared to the narrow pH working range (≈3) in the Fenton reaction, [81] Mn-based Fenton-like reaction produces ROS by catalyzing H 2 O 2 without adjusting solution pH. [52] Also, Mn oxides are semiconductors, which attracted much attention in photo-Fenton reactions in recent years.…”

Section: Catalytic Mechanism Of Organic Pollutant Degradationmentioning

confidence: 99%

“…[17] Also, H 2 O 2 is a green peroxide that can evolve into reactive oxygen species (ROS) such as HOO • , O 2 •-, and • OH in Fenton/Fenton-like reactions for effective degradation of organic contaminants in water. [18,19] Attributed to the dual functions, H 2 O 2 can not only yield propulsion forces, but also attain the environmental functions when micro/nanomotors are used as the driver and catalyst. However, the propelling of micro/nanomotors requires high-concentrated H 2 O 2 , which hinders the application in biomedical therapy.…”

Section: Introductionmentioning

confidence: 99%

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Yang

Zhang

et al. 2021

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As emerging micro/nano‐scale devices, micro/nanomotors have been innovatively applied in the environmental and biomedical applications. In this paper, the recent advances of Mn‐based micro/nanomotors (Mn‐micro/nanomotors) in catalytic oxidation of organic contaminants and the mechanisms in decomposition of H2O2 (e.g., the generation of O2 bubbles and reactive oxygen species) are reviewed. The intrinsic characteristics and synthetic strategies of Mn‐based materials are discussed, aiming to gain comprehensive understandings on the asymmetric design of micro/nanomotors. Mn‐micro/nanomotors have many advantages such as flexible structures, biocompatibility, powerful motion, long lifetime, and low‐cost as compared to noble‐metal micro/nanomotors. These merits fulfil Mn‐micro/nanomotors great promises from proof‐of‐concept studies to realistic applications, including pollutant decomposition, trace detection of heavy metal ions, oil removal, drug delivery, isolation of biological targets, and killing bacteria and cancer cells. The great flexibility in fabrication enables diverse and innovative strategies to address challenges for Mn‐micro/nanomotors, including high consumption of H2O2 and non‐directional motion. Meanwhile, a perspective of Mn‐micro/nanomotors in water remediation by coupling the motors with other Fenton/Fenton‐like systems to enhance the catalytic activity and to yield more reactive oxygen species is presented. Directions to the design of on‐demand H2O2‐fueled Mn‐micro/nanomotors for advanced purification of organic contaminants in aquatic systems are also proposed.

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“…By combining heterogeneous Fenton reaction with electro-Fenton reaction, the H 2 O 2 synthesized in situ can be simultaneously decomposed by Fe on the catalysts into •OH radicals, which finally degrading or even mineralizing organic contaminants. [8].…”

Section: Introductionmentioning

confidence: 99%

Monolithic Mesh-Type Fe-Pd/γ-Al<sub>2</sub>O<sub>3</sub>/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B

Qianwen¹,

Zhang²,

Lu³

et al. 2021

MRC

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A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al 2 O 3 /Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al 2 O 3 /Al bifunctional catalyst could be separated from the solution directly and could synthesize H 2 O 2 in situ. The characterization results showed that Fe could improve the dispersion of Pd 0 , and the electronic interactions between Pd and Fe could increase the Pd 0 contents on the catalyst, which increased the productivity of H 2 O 2 . Furthermore, DFT calculations proved that the addition of Fe could inhibit the dissociation of O 2 and promote the nondissociative hydrogenation of O 2 on the surface of Fe-Pd/γ-Al 2 O 3 /Al, which resulted in the increasement of H 2 O 2 selectivity. Finally, the in-situ synthesized H 2 O 2 by Pd was furtherly decomposed in situ by Fe to generate •OH radicals to degrade organic pollutants. Therefore, Fe-Pd/ γ-Al 2 O 3 /Al catalysts exhibited excellent catalytic activity in the in-situ synthesis of H 2 O 2 and the degradation of RhB due to the synergistic effects between Pd and Fe on the catalyst. It provided a new idea for the design of bifunctional electro-Fenton catalysts. Ten cycles of experiments showed that the catalytic activity of Fe-Pd/γ-Al 2 O 3 /Al catalyst could be maintained for a long time.

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Generation of H2O2 by on-site activation of molecular dioxygen for environmental remediation applications: A review

Cited by 108 publications

References 144 publications

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Monolithic Mesh-Type Fe-Pd/γ-Al<sub>2</sub>O<sub>3</sub>/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B

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Generation of H2O2 by on-site activation of molecular dioxygen for environmental remediation applications: A review

Cited by 108 publications

References 144 publications

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C3N4) Photocatalysts toward Artificial Photosynthesis

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C3N4) Photocatalysts toward Artificial Photosynthesis

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Monolithic Mesh-Type Fe-Pd/γ-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B

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Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Point‐Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g‐C₃N₄) Photocatalysts toward Artificial Photosynthesis

Monolithic Mesh-Type Fe-Pd/γ-Al<sub>2</sub>O<sub>3</sub>/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B