N, S, and P-Co-doped Carbon Quantum Dots: Intrinsic Peroxidase Activity in a Wide pH Range and Its Antibacterial Applications

ACS Biomaterials Science & Engineering, Journal Year: 2020, Volume and Issue: 6(10), P. 5527 - 5537

Published: Sept. 3, 2020

Nanozymes have drawn significant scientific interest due to their high practical importance in terms of overcoming the instability, complicated synthesis, and cost protein enzymes. However, activity is generally limited particular pHs, especially acidic ones. Herein, we report that luminescent N, S, P-co-doped carbon quantum dots (NSP-CQDs) act as attractive peroxidase mimetics a wide pH range, even at neutral pH, for substrate 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) presence H2O2. The synergistic effects multiple heteroatoms doping CQDs boost catalytic range attributed density active sites enzymatic-like catalysis accelerated electron transfer during peroxidase-like reactions. A possible reaction mechanism investigated based on radical trapping experiments. Moreover, multifunctional NSP-CQDs was further utilized antibacterial assays both Gram-negative Gram-positive model species, including Escherichia coli (E. coli) Staphylococcus aureus (S. aureus), respectively. growths employed E. S. were found be significantly inhibited peroxidase-mediated perturbation cell walls. present work signifies current advance rational design highly mimics novel applications diverse fields, catalysis, medical diagnostics, environmental chemistry, biotechnology.

Language: Английский

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Advances of graphene oxide based nanocomposite materials in the treatment of wastewater containing heavy metal ions and dyes

Current Research in Green and Sustainable Chemistry, Journal Year: 2022, Volume and Issue: 5, P. 100306 - 100306

Published: Jan. 1, 2022

The introduction of inorganic and organic contaminants into aquatic systems by waste streams released from urban, industrial, agricultural, other sources has become a global problem. Heavy metal ions synthetic dyes are the most common in natural systems, causing variety life-threatening problems humans living things. Graphene oxide-based nanocomposite materials have been widely used treatment water/wastewater containing heavy dye pollutants because their high surface areas, excellent mechanical strength, adaptability to different functional groups. Adsorption-based removal aqueous media, as well photo-degradation using efficient adsorbents or photo-catalysts like graphene-based materials, lot benefits, including cost-effectiveness, applicability large-scale operations, efficiency, reutilization. majority graphene reduced oxide can remove degrade over 90% wastewater. According literature review, some these decontaminated wastewater extent 99 100%. potential based nanomaterials water/wastewater, significant features nanomaterials, adsorption photo-catalytic processes, future aspects, relevant current investigations all discussed this review.

Language: Английский

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Photocatalytic Degradation of Methylene Blue Using N-Doped ZnO/Carbon Dot (N-ZnO/CD) Nanocomposites Derived from Organic Soybean

ACS Omega, Journal Year: 2023, Volume and Issue: 8(17), P. 14965 - 14984

Published: April 17, 2023

This study reports on successful synthesis of carbon dots (CDs), nitrogen-doped zinc oxide (N-ZnO), and N-ZnO/CD nanocomposites as photocatalysts for degradation methylene blue. The first part was the CDs utilizing a precursor from soybean ethylenediamine dopant by hydrothermal method. second N-ZnO with urea nitrogen carried out calcination method in furnace at 500 °C 2 h an N2 atmosphere (5 min-1). third nanocomposites. characteristics CDs, N-ZnO, were analyzed through Fourier transform infrared (FTIR), UV-vis absorbance, photoluminescence (PL), high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), thermal gravimetry analysis (TGA), field-emission scanning energy-dispersive spectroscopy (FESEM EDS), photoelectron (XPS), Brunauer-Emmett-Teller (BET) analysis. Based HR-TEM analysis, had spherical shape average particle size 4.249 nm. Meanwhile, based XRD characterization, have wurtzite hexagonal structures. materials show increased adsorption visible light region low energy gap Eg. Eg values N-ZnO/CDs found to be 2.95 2.81 eV, respectively, whereas surface area (SBET) 3.827 m2 g-1 (N-ZnO) 3.757 g-1(N-ZnO/CDs) belonged microporous structure. In last part, used MB (10 ppm) under UV-B irradiation pH = 7.04 (neutral) 60 min room temperature. showed photodegradation efficiency 83.4% kinetic rate 0.0299 min-1 higher than CDs. FESEM EDS before after three cycles confirm stability photocatalyst 58.2%. These results clearly shown that could ideal photocatalytic material decolorization organic compounds wastewater.

Language: Английский

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Synthesis, properties, and utilization of carbon quantum dots as photocatalysts on degradation of organic dyes: A mini review

Catalysis Communications, Journal Year: 2024, Volume and Issue: 187, P. 106914 - 106914

Published: Feb. 1, 2024

This review highlights Carbon Quantum Dots (CQDs) as promising photocatalysts for breaking down organic pollutants, particularly in advancing CQDs-based systems degrading dyes. CQDs, used alone or combined with semiconductors, enhance performance. In scenarios narrow bandgaps, CQDs assist separating charges, whereas wider they enable visible/NIR activity through up-conversion luminescence. When integrated into Z-scheme heterostructures, reduce recombination by facilitating electron transfer. Synthesis methods—both top-down and bottom-up—are explored along crucial physicochemical properties. Furthermore, modifying doping integrating functional groups on their surface adjusts characteristics, more effective CQDs-modified future research.

Language: Английский

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Efficient degradation and detoxification of methylene blue dye by a newly isolated ligninolytic enzyme producing bacterium Bacillus albus MW407057

Colloids and Surfaces B Biointerfaces, Journal Year: 2021, Volume and Issue: 206, P. 111947 - 111947

Published: June 26, 2021

Language: Английский

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Carbon quantum dots as ROS-generator and -scavenger: A comprehensive review

Dyes and Pigments, Journal Year: 2022, Volume and Issue: 208, P. 110784 - 110784

Published: Sept. 26, 2022

Language: Английский

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RGO/WO3 hierarchical architectures for improved H2S sensing and highly efficient solar-driving photo-degradation of RhB dye

Scientific Reports, Journal Year: 2021, Volume and Issue: 11(1)

Published: March 3, 2021

Abstract Surface area and surface active sites are two important key parameters in enhancing the gas sensing as well photocatalytic properties of parent material. With this motivation, herein, we report a facile synthesis Reduced Graphene Oxide/Tungsten Oxide RGO/WO 3 hierarchical nanostructures via simple hydrothermal route, their validation accomplishment improved H 2 S highly efficient solar driven photo-degradation RhB Dye. The self-made RGO using modified Hummer’s method, is utilized to develop nanocomposites with 0.15, 0.3 0.5 wt% WO matrix. As-developed were analyzed various physicochemical techniques such XRD, FE-SEM, TEM/HRTEM, EDAX. creation hierarchic marigold frameworks culminated affiliated mesoporous system, offering delivery networks, leading significant increase response S. optimized sensor (RGO/WO loading) exhibited selective towards S, which ~ 13 times higher (R /R g = 22.9) than pristine 1.78) sensor. Looking at bi-directional application, graphene platform boosted activity (94% degradation Rhodamine B dye 210 min) under natural sunlight. RGO’s role increasing clarified by analysis solar-driven solution. outcome study provides new insights based nanocomposites’ research spreadsheet, view multidisciplinary applications.

Language: Английский

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Recent advances in application of the graphene-based membrane for water purification

Materials Today Chemistry, Journal Year: 2021, Volume and Issue: 22, P. 100597 - 100597

Published: Oct. 22, 2021

Language: Английский

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Prospects of nano-carbons as emerging catalysts for enzyme-mimetic applications

Materials Advances, Journal Year: 2022, Volume and Issue: 3(7), P. 3101 - 3122

Published: Jan. 1, 2022

A strategy of using nano-carbons to mimic the catalytic behaviour enzymes is put forward.

Language: Английский

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Research Progress and Prospects of Spinel Ferrite Nanostructures for the Removal of Nitroaromatics from Wastewater

ACS Applied Nano Materials, Journal Year: 2022, Volume and Issue: 5(11), P. 16000 - 16026

Published: Nov. 14, 2022

Spinel ferrite nanostructures have played significant roles in the development of materials science and technology. possess not only promising magnetic properties but also high resistivity, stability, low eddy current losses. The recent progress utilization spinel for water remediation is reviewed with special emphasis on adsorption, transformation, degradation, catalytic reduction nitroaromatics. Then, structure–property relationships design considerations applications are discussed detail. Insights into details various removal processes model provided a basic concept nitroaromatics remediation. Subsequently, reaction kinetics mechanisms classified their advantages disadvantages described. Lastly, challenges future perspectives practical presented. With further advancement, ferrites potential to be practically utilized wide range such as treatment plants.

Language: Английский

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