A plasmonic S-scheme Au/MIL-101(Fe)/BiOBr photocatalyst for efficient synchronous decontamination of Cr(VI) and norfloxacin antibiotic

eScience, Journal Year: 2023, Volume and Issue: 4(2), P. 100208 - 100208

Published: Nov. 3, 2023

Present photocatalysts for the synchronous cleanup of pharmaceuticals and heavy metals have several drawbacks, including inadequate reactive sites, inefficient electron–hole disassociation, insufficient oxidation reduction power. In this research, we sought to address these issues by using a facile solvothermal-photoreduction route develop an innovative plasmonic S-scheme heterojunction, Au/MIL-101(Fe)/BiOBr. The screened-out Au/MIL-101(Fe)/BiOBr (AMB-2) works in durable high-performance manner both Cr(VI) norfloxacin (NOR) eradication under visible light, manifesting up 53.3 2 times greater NOR abatement rates, respectively, than BiOBr. Remarkably, AMB-2's ability remove Cr(VI)-NOR co-existence system is appreciably better sole-Cr(VI) environment; synergy among Cr(VI), NOR, AMB-2 results utilization photo-induced carriers, yielding desirable capacity decontaminating synchronously. integration MOF-based heterojunctions effect contributes markedly reinforced photocatalytic increasing number active augmenting visible-light absorbance, boosting efficient disassociation redistribution powerful photo-carriers, elevating generation substances. We provide details mechanism, decomposition process, bio-toxicity intermediates. This synergistic strategy modifying with noble metal opens new horizons devising excellent photosystems environment purification.

Language: Английский

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MIL-101(Fe)/BiOBr S-scheme photocatalyst for promoting photocatalytic abatement of Cr(VI) and enrofloxacin antibiotic: Performance and mechanism

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2023, Volume and Issue: 51, P. 101 - 112

Published: Aug. 1, 2023

Language: Английский

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In Situ Synthesis of Chemically Bonded 2D/2D Covalent Organic Frameworks/O‐Vacancy WO₃ Z‐Scheme Heterostructure for Photocatalytic Overall Water Splitting

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(33)

Published: June 15, 2023

Abstract Covalent organic frameworks (COFs) have shown great promise for photocatalytic hydrogen evolution via water splitting. However, the four‐electron oxidation of remains elusive toward oxygen evolution. Enabling this pathway is critical to improve yield and maximize atom utilization efficiency. A Z‐scheme heterojunction proposed overcoming fundamental issues in COF‐based overall splitting (OWS), such as inefficient light absorption, charge recombination, poor ability. It that construction a novel 2D/2D through situ growth COFs on O‐vacancy WO 3 nanosheets (Ov‐WO ) WOC chemical bond can remarkably promote OWS. Benefiting from synergistic effect between enhanced built‐in electric field by interfacial bond, strong ability Ov‐WO 3, ultrathin structure TSCOF, both separation efficiency photogenerated electron–hole pairs be significantly enhanced. An impressive half‐rection rate 593 mmol h −1 g 146 (hydrogen) 68 (oxygen) µmol are achieved COF‐WO (TSCOFW) composite. This with two‐step excitation precisely cascaded charge‐transfer makes it responsible efficient solar‐driven OWS without sacrificial agent.

Language: Английский

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Metal–organic framework heterojunctions for photocatalysis

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(6), P. 3002 - 3035

Published: Jan. 1, 2024

The present review summarizes the current state-of-the-art in MOF-based heterojunctions three important photocatalytic processes: hydrogen evolution reaction, CO 2 photoreduction and photodegradation of dyes.

Language: Английский

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Efficient Photocatalytic Hydrogen Evolution by Modulating Excitonic Effects in Ni‐Intercalated Covalent Organic Frameworks

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(13)

Published: Feb. 15, 2023

Abstract Covalent organic frameworks (COFs) as appealing platforms have received tremendous interest in the field of photocatalytic H 2 evolution owing to their well‐defined structures and tailor‐made function. However, excitonic effects resulting from Coulomb interactions between electron–hole pairs are key rate‐determining processes hydrogen evolution, which usually ignored. Thus, it is profound significance highly desired, but still a challenge, explore new routes modulate dissociation COFs for boosting photocatalysis. To address this Ni‐intercalated fluorenone‐based (Ni‐COF‐SCAU‐1) at imine linkage, proposed first time, demonstrated exhibit enhanced polarization electric field; thus, facilitating Hall electron mobility singlet excitons into free charge carriers under photoexcitation participate surface reaction. Benefiting these results, Ni‐COF‐SCAU‐1 displays production rate 197.46 mmol·g −1 h visible light irradiation with an apparent quantum efficiency (AQE) up 43.2% 420 nm. This work offers in‐depth understanding crucial role interlayer atomic interface improving paves way regulation COFs.

Language: Английский

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Manipulating the Spin State of Co Sites in Metal–Organic Frameworks for Boosting CO₂ Photoreduction

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(5), P. 3241 - 3249

Published: Jan. 26, 2024

Photocatalytic CO2 reduction holds great potential for alleviating global energy and environmental issues, where the electronic structure of catalytic center plays a crucial role. However, spin state, key descriptor properties, is largely overlooked. Herein, we present simple strategy to regulate states Co centers by changing their coordination environment exchanging species into stable Zn-based metal–organic framework (MOF) afford Co-OAc, Co-Br, Co-CN photoreduction. Experimental DFT calculation results suggest that distinct sites give rise different charge separation abilities barriers adsorption/activation in photocatalysis. Consequently, optimized Co-OAc with highest spin-state presents an excellent photocatalytic activity 2325.7 μmol·g–1·h–1 selectivity 99.1% CO, which are among best all reported MOF photocatalysts, absence noble metal additional photosensitizer. This work underlines MOFs as ideal platform manipulation toward improved

Language: Английский

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Effect of Controlling Thiophene Rings on D-A Polymer Photocatalysts Accessed via Direct Arylation for Hydrogen Production

Molecules, Journal Year: 2023, Volume and Issue: 28(11), P. 4507 - 4507

Published: June 1, 2023

Conjugated polymer photocatalysts for hydrogen production have the advantages of an adjustable structure, strong response in visible light region, energy levels, and easy functionalization. Using atom- step-economic direct C–H arylation method, dibromocyanostilbene was polymerized with thiophene, dithiophene, terthiophene, fused thienothiophene dithienothiophene, respectively, to produce donor–acceptor (D-A)-type linear conjugated polymers containing different thiophene derivatives conjugation lengths. Among them, D-A photocatalyst constructed from dithienothiophene could significantly broaden spectral response, a evolution rate up 12.15 mmol h−1 g−1. The results showed that increase number rings on building blocks beneficial photocatalytic cyanostyrylphene-based polymers. For unfused dithiophene enabled more rotation freedom between reduced intrinsic charge mobility, resulting lower performance accordingly. This study provides suitable process design electron donors photocatalysts.

Language: Английский

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Metal-organic framework-based catalysts for hydrogen production from liquid-phase chemical hydrides

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 493, P. 215302 - 215302

Published: July 11, 2023

Language: Английский

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Linker Engineering of Sandwich‐Structured Metal–Organic Framework Composites for Optimized Photocatalytic H₂ Production

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(39)

Published: July 8, 2023

While the microenvironment around catalytic sites is recognized to be crucial in thermocatalysis, its roles photocatalysis remain subtle. In this work, a series of sandwich-structured metal-organic framework (MOF) composites, UiO-66-NH2 @Pt@UiO-66-X (X means functional groups), rationally constructed for visible-light photocatalytic H2 production. By varying ─X groups UiO-66-X shell, Pt and photosensitive core can simultaneously modulated. Significantly, MOF composites with identical light absorption loading present distinctly different production rates, following group sequence ─H > ─Br ─NA (naphthalene) ─OCH3 ─Cl ─NO2 . @Pt@UiO-66-H demonstrates rate up 2708.2 µmol g-1 h-1 , ≈222 times that @Pt@UiO-66-NO2 Mechanism investigations suggest variation balance charge separation proton reduction ability Pt, leading an optimal activity at equilibrium point.

Language: Английский

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Efficient overall water splitting of a suspended photocatalyst boosted by metal-support interaction

Joule, Journal Year: 2024, Volume and Issue: 8(1), P. 193 - 203

Published: Jan. 1, 2024

Language: Английский

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