Cyano-deficient g-C3N4 for round-the-clock photocatalytic degradation of tetracycline: mechanism and application prospect evaluation

Water Research, Год журнала: 2024, Номер 260, С. 121936 - 121936

Опубликована: Июнь 12, 2024

Язык: Английский

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Hydroxyl-Functionalized Donor–Acceptor Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Peroxide Production under Visible Light

ACS Catalysis, Год журнала: 2025, Номер unknown, С. 3584 - 3594

Опубликована: Фев. 13, 2025

Photocatalytic hydrogen peroxide (H2O2) production via the oxygen reduction reaction (ORR) provides a promising and energy-saving alternative to traditional energy-intensive anthraquinone process. Nevertheless, how decrease energy barrier of two-electron (2e–) ORR process photosynthesize H2O2 efficiently is still challenging. Herein, three hydroxyl-functionalized donor–acceptor covalent organic frameworks (COFs) are synthesized for photocatalytic under visible-light irradiation (420 ≤ λ 780 nm). It observed that dihydroxyl functionalization (2,5-DhaTph 2,3-DhaTph) facilitates transportation photogenerated carriers between acceptor donor units accelerates kinetics rate-limiting step when comparing with monohydroxyl (2-DhaTph). Further, 2,5-DhaTph para-position hydroxyl shows higher photosynthesis efficiency than 2,3-DhaTph (ortho-positioned hydroxyl), probably due greater exposure catalytically active sites. This supported by better structural symmetry 2,5-DhaTph, which contributes crystallinity specific surface areas. Electron paramagnetic resonance (EPR) spectra theoretical calculations show produces *OOH intermediates reduced barrier, resulting in high rate 2103.1 μmol h–1 g–1. Regulating amount substituents their location on COFs an effective strategy boost carrier transfer reduce O2-to-H2O2 conversion.

Язык: Английский

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Boosting Exciton Dissociation and Charge Transfer in Triazole-Based Covalent Organic Frameworks by Increasing the Donor Unit from One to Two for the Efficient Photocatalytic Elimination of Emerging Contaminants

Environmental Science & Technology, Год журнала: 2023, Номер 57(31), С. 11675 - 11686

Опубликована: Июль 24, 2023

As novel photocatalysts, covalent organic frameworks (COFs) have potential for water purification. Insufficient exciton dissociation and low charge mobility in COFs yet restricted their photocatalytic activity. Excitonic transfer could be optimized via regulating the donor–acceptor (D–A) interactions through adjusting number of donor units within COFs, relevant research is lacking. By integrating 1,2,4-triazole or bis-1,2,4-triazole unit with quinone, we fabricated COF-DT (with a single unit) COF-DBT double units) facile sonochemical method used to decontaminate emerging contaminants. Due stronger D–A than COF-DT, binding energy was lower COF-DBT, facilitating intermolecular process. The degradation kinetics tetracycline (model contaminant) by (k = (12.21 ± 1.29) × 10–2 min–1) higher that (5.11 0.59) under visible-light irradiation. efficiently photodegrade complex chemistry conditions four real samples. Moreover, six other contaminants, both Gram-negative Gram-positive strains, also effectively eliminated COF-DBT. High performance achieved continuous-flow system five reused cycles laboratory outdoor experiments sunlight irradiation showed stability practical application

Язык: Английский

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Enhancing charge transfer efficiency of cerium-iron oxides via Co regulated oxygen vacancies to boost peroxymonosulfate activation for tetracycline degradation

Separation and Purification Technology, Год журнала: 2023, Номер 314, С. 123524 - 123524

Опубликована: Март 4, 2023

Язык: Английский

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Organic Donor‐Acceptor Systems for Photocatalysis

Advanced Science, Год журнала: 2023, Номер 11(10)

Опубликована: Дек. 25, 2023

Abstract Organic semiconductor materials are considered to be promising photocatalysts due their excellent light absorption by chromophores, easy molecular structure tuning, and solution‐processable properties. In particular, donor‐acceptor (D‐A) type organic photocatalytic synthesized introducing D A units intra‐ or intermolecularly, have made great progress in studies. More more studies demonstrated that the D‐A combine effective carrier separation, tunable bandgap, sensitive optoelectronic response, an strategy for enhancing absorption, improving exciton dissociation, optimizing transport. This review provides a thorough overview of strategies aimed at performance semiconductors. Initially, essential methods modifying materials, such as interface engineering, crystal interaction modulation, briefly discussed. Subsequently, delves into various based on intramolecular intermolecular interactions, encompassing small molecules, conjugated polymers, crystalline supramolecules, heterojunctions. Meanwhile, energy band structures, dynamics, redox‐active sites under different bonding modes Finally, highlights advanced applications photocatalystsand outlines prospective challenges opportunities.

Язык: Английский

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Removal of norfloxacin from high salinity wastewater by Hf-porphyrin MOF with missing linker defects: Insights into anion trapping and photoinduced charge transfer effects

Chemical Engineering Journal, Год журнала: 2023, Номер 466, С. 143194 - 143194

Опубликована: Апрель 27, 2023

Язык: Английский

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Nonradical pathway dominated activation of peroxymonosulfate by ZnFe2O4/C composites to eliminate tetracycline hydrochloride: Insight into the cycle of Zn/Fe and electron transfer

Separation and Purification Technology, Год журнала: 2023, Номер 322, С. 124336 - 124336

Опубликована: Июнь 15, 2023

Язык: Английский

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Improvement strategies on application of covalent organic frameworks in adsorption, photocatalytic, and membrane processes for organic pollution removal from water

Coordination Chemistry Reviews, Год журнала: 2024, Номер 518, С. 216087 - 216087

Опубликована: Июль 18, 2024

Язык: Английский

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New breakthrough in rapid degradation of lignin derivative compounds · A novel high stable and reusable green organic photocatalyst

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 662, С. 426 - 437

Опубликована: Фев. 13, 2024

Язык: Английский

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Advances of functionalized bipyridine-based covalent-organic frameworks for boosting photocatalysis

Coordination Chemistry Reviews, Год журнала: 2024, Номер 516, С. 215997 - 215997

Опубликована: Июнь 5, 2024

Язык: Английский

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