Application of biochar-based photocatalysts for adsorption-(photo)degradation/reduction of environmental contaminants: mechanism, challenges and perspective

Biochar, Journal Year: 2022, Volume and Issue: 4(1)

Published: July 26, 2022

Abstract The fast increase of population results in the quick development industry and agriculture. Large amounts contaminants such as metal ions organic are released into natural environment, posing a risk to human health causing environment ecosystem problems. efficient elimination from aqueous solutions, photocatalytic degradation pollutants or in-situ solidification/immobilization heavy solid phases most suitable strategies decontaminate pollution. Biochar biochar-based composites have attracted multidisciplinary interests especially environmental pollution management because their porous structures, large functional groups, high adsorption capacities photocatalysis performance. In this review, application biochar adsorbents and/or catalysts for different contaminants, adsorption-photodegradation pollutants, adsorption-(photo)reduction summarized, mechanism was discussed advanced spectroscopy analysis DFT calculation detail. doping oxides is main strategy narrow band gap, generation separation photogenerated e − -h + pairs, produce more superoxide radicals (·O 2 ) hydroxyl (·OH), enhance visible light absorption performance, which dominate (photo)reduction valent metals low metals. environmentally friendly materials, promising candidates cleanup. challenge perspective provided end. Graphical

Language: Английский

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Tunable Interfacial Charge Transfer in a 2D–2D Composite for Efficient Visible‐Light‐Driven CO₂ Conversion

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: March 25, 2023

Photocatalytic CO2 conversion for hydrocarbon fuel production has been known as one of the most promising strategies achieving carbon neutrality. Yet, its efficiency remains unsatisfactory mainly due to severe charge-transfer resistance and slow charge kinetics. Herein, a tunable interfacial transfer on an oxygen-vacancies-modified bismuth molybdate nanoflower assembled by 2D nanosheets (BMOVs) bismuthene composite (Bi/BMOVs) is demonstrated photocatalytic conversion. Specifically, meticulous design Ohmic contact formed between BMOVs can allow modulation resistance. According density functional theory (DFT) simulations, it ascertained that such exceptional kinetics attributed built-in electric field (IEF) contact. As such, reduction performance optimized Bi/BMOVs (CO CH4 productions rate 169.93 4.65 µmol g-1 h-1 , respectively) ca. 10 times higher than pristine BMO rates 16.06 0.51 respectively). The reported in this work shed some important light highly efficient photocatalysts both energy environmental applications.

Language: Английский

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Application of covalent organic frameworks and metal–organic frameworks nanomaterials in organic/inorganic pollutants removal from solutions through sorption-catalysis strategies

Carbon Research, Journal Year: 2023, Volume and Issue: 2(1)

Published: Feb. 9, 2023

Abstract With the fast development of agriculture, industrialization and urbanization, large amounts different (in)organic pollutants are inevitably discharged into ecosystems. The efficient decontamination contaminants is crucial to human health ecosystem pollution remediation. Covalent organic frameworks (COFs) metal–organic (MOFs) have attracted multidisciplinary research interests because their outstanding physicochemical properties like high stability, surface areas, sorption capacity or catalytic activity. In this review, we summarized recent works about elimination/extraction pollutants, heavy metal ions, radionuclides by MOFs COFs nanomaterials through sorption-catalytic degradation for chemicals reduction-precipitation-extraction metals radionuclides. interactions between COFs/MOFs at molecular level were discussed from density functional theory calculation spectroscopy analysis. was mainly dominated electrostatic attraction, π-π interaction, complexation H-bonding whereas ions attributed complexation, ion exchange, reduction incorporation reactions. porous structures, groups, active sites important ability selectivity. doping co-doping metal/nonmetal, with other materials could change visible light harvest generation/separation electrons/holes (e − /h + ) pairs, thereby enhanced photocatalytic challenges possible application in elimination water described end.

Language: Английский

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Biochar-based materials in environmental pollutant elimination, H2 production and CO2 capture applications

Biochar, Journal Year: 2023, Volume and Issue: 5(1)

Published: July 20, 2023

Abstract Biochar and biochar-based materials have been studied extensively in multidisciplinary areas because of their outstanding physicochemical properties. In this review article, biochar the removal environmental pollutants, hydrogen generation carbon dioxide capture were summarized compared. The interaction mechanisms discussed from experimental results characterization analysis. high porous structures, active surface sites, (co)doping single metals/nonmetals, incorporation metal oxides or other improved activity applications. However, there are still some challenges such as: (1) fact that H 2 with selectivity produced syngas to meet real application requirement industrial is main challenge production; (2) selective CO stability, adsorption capacity recyclability at low-cost should be considered focused on; (3) sorption-(photo)degradation organic chemicals; (4) sorption-reduction-extraction/solidification metals/radionuclides efficient methods for elimination pollutants. end, perspectives, possible techniques materials’ future described. Graphical

Language: Английский

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g-C3N4-based photocatalysts for organic pollutant removal: a critical review

Carbon Research, Journal Year: 2023, Volume and Issue: 2(1)

Published: April 6, 2023

Abstract With rapid global industrialization, environmental pollution has become one of the major problems human society. Photocatalysis can be applied to solve problem by using inexhaustible solar energy. As a novel two-dimensional material, graphite carbon nitride (g-C 3 N 4 ) been widely in many photocatalytic reactions. However, terms its practical applications, g-C still limitations, including poor photoexcited charge separation, limited range visible light absorption, and low surface areas. Hence, current research on mainly focuses improving performance. In this review, we summarize various methods improve ’s absorption photo-induced transfer, vacancy engineering, morphology control, heteroatom doping, forming heterostructure. The applications derivatives photodegradation organic pollutants are also discussed detail. Finally, challenges future directions photocatalysts summarized promote their applications. Graphical

Language: Английский

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Sorption-catalytic reduction/extraction of hexavalent Cr(VI) and U(VI) by porous frameworks materials

Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 314, P. 123615 - 123615

Published: March 17, 2023

Language: Английский

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Photo‐enhanced uranium recovery from spent fuel reprocessing wastewater via S‐scheme 2D/0D C₃N₅/Fe₂O₃ heterojunctions

SusMat, Journal Year: 2024, Volume and Issue: 4(2)

Published: April 1, 2024

Abstract Re‐extracting environmentally transportable hexavalent uranium from wastewater produced by spent fuel reprocessing using the photocatalytic technology is a crucial strategy to avoid pollution and recover nuclear strategic resources. Here, we have designed S‐scheme 2D/0D C 3 N 5 /Fe 2 O heterojunction photocatalysts based on built‐in electric field energy band bending theory, further revealed immobilization process of conversion into relatively insoluble tetravalent in terms thermodynamics kinetics. According results, removal recovery ratios are as high 93.38% 83.58%, respectively. Besides, heterojunctions also exhibit satisfactory catalytic activity selectivity even presence excessive impurity cations (including Na + , K Ca 2+ Mg Sr Eu 3+ ) or various organics (such xylene, tributylphosphate, pyridine, tannic acid, citric oxalic acid). It believed that this work can provide potential opportunity for re‐enrich wastewater.

Language: Английский

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Defect engineering on constructing surface active sites in catalysts for environment and energy applications

Frontiers of Chemical Science and Engineering, Journal Year: 2024, Volume and Issue: 18(7)

Published: June 10, 2024

Language: Английский

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Carbon-based nanocomposites for the elimination of inorganic and organic pollutants through sorption and catalysis strategies

Separation and Purification Technology, Journal Year: 2022, Volume and Issue: 308, P. 122862 - 122862

Published: Dec. 6, 2022

Language: Английский

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Construction of a novel heteropoly molybdophosphate/graphitized carbon nitride s-scheme heterostructure with enhanced photocatalytic H2O2 evolution activity

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 654, P. 1228 - 1239

Published: Oct. 25, 2023

Language: Английский

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