Direct Z‐Scheme Xylan‐Based Carbon Dots@TiO_2‐x Nanocomposites for Visible Light Driven Photocatalytic of Dye Degradation and Antibacterial

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(32)

Published: May 13, 2024

Abstract TiO 2 photocatalysis has gained attention as a cost‐effective way of degrading contaminants. However, it relies on UV excitation and experiences rapid carrier recombination. To address these drawbacks, novel xylan‐based carbon dots@hydrogenated (CDs@TiO 2‐x ) composited by direct Z‐scheme heterojunction is fabricated visible light‐driven photocatalytic material, which broadens the range light absorption to suppresses recombination photogenerated carriers. The spindle‐shaped CDs@TiO C/N/O/S groups, positive charges, oxygen vacancies its surface, can degrade 89% methylene blue 87% methyl orange within 90 min, 99% rhodamine B 60 min in light. It also eradicates 99.9% E. coli h 97.1% S. aureus 2.5 h. These performances surpass CDs , exhibit advantages similar composite materials. degradation pathways dyes specific antibacterial processes induced ROS are thoroughly investigated through LC‐MS testing related enzyme activity assays. DFT calculations study role vacancies, mechanism, catalytic sites. This developed nanocomposite with applications both dye sterilization, offering insights for multifunctional materials based heterojunction.

Language: Английский

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Spin‐state Conversion by Asymmetrical Orbital Hybridization in Ni‐doped Co₃O₄ to Boost Singlet Oxygen Generation for Microbial Disinfection

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(12)

Published: Jan. 25, 2024

Singlet oxygen (1 O2 ) plays a significant role in environmental and biomedical disinfection fields. Electrocatalytic processes hold great potential for 1 generation, but remain challenging. Herein, facile Ni doping converted spin-state transition approach is reported boosting production. Magnetic analysis theoretical calculations reveal that occupied at the octahedral site of Co3 O4 can effectively induce low-to-high transition. The high-spin Ni-Co3 generate appropriate binding strength enhance electron transfer between Co centers with intermediates, thereby improving catalytic activity effective generating . In neutral conditions, 1×106 CFU mL-1 Gram-negative ESBL-producing Escherichia coli (E. coli) could be inactivated by system within 5 min. Further antibacterial mechanisms indicate lead to cell membrane damage DNA degradation so as irreversible death. Additionally, developed inactivate bacteria from wastewater bioaerosols. This work provides an strategy designing electrocatalysis boost generation process.

Language: Английский

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Manipulation of Surface Electrical Charge on Nanocomposite Membranes Confers Wide Spectrum Bactericidal Effects and Promotes Tissue Regeneration

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(22)

Published: Feb. 5, 2024

Abstract Utilization of electro‐responsive biomaterials with antibacterial properties is advantageous for facilitating septic wound healing and tissue regeneration. However, the dose‐response effects electrical stimuli from these materials against bacteria are not rigorously characterized, achieving synergy bactericidal pro‐regenerative remains a major challenge. Here, graded series flexible BaTiO 3 /P(VDF‐TrFE) electroactive nanocomposite membranes (EMs) developed varying surface charge intensities, to serve as dressing healing. EMs display broad‐spectrum both Gram‐positive Gram‐negative in dose‐dependent manner, depending on magnitude their potential. Mechanistically, increase intracellular levels reactive oxygen species within cells, which turn caused oxidative damage bacterial membrane, thereby suppressing activity biofilm formation. Moreover, vivo studies demonstrated that effectively inhibited S. aureus infection accelerated mouse skin defect model, well ameliorated P. gingivalis‐ mediated periodontal inflammation periodontitis model. Hence, this study optimizes characterizes bacteria, thus validating therapeutic applications combating infection.

Language: Английский

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Near-Infrared Chiroptical Activity Titanium Dioxide Supraparticles with Circularly Polarized Light Induced Antibacterial Activity

ACS Nano, Journal Year: 2023, Volume and Issue: 18(1), P. 641 - 651

Published: Dec. 19, 2023

Titanium dioxide (TiO2) has attracted significant attention in the fields of antibacterial activity and pollutant degradation due to its well-known photocatalytic properties. However, application TiO2 is significantly limited by large band gap width, which only allows excitation ultraviolet light below 400 nm. Here, we propose use surface chiral functionalization tune thus enabling it be excited near-infrared-region (NIR), resulting effective separation electron–hole pairs. By controlling solvent polarity forming numerous weak interactions (such as hydrogen bonding) between ligands TiO2, successfully prepared superparticles (SPs) that exhibited a broad circular dichroism (CD) absorption at 792 Under circularly polarized (CPL) 808 nm, SPs induced pairs generating hydroxyl singlet oxygen radicals. Antibacterial tests under CPL NIR showed excellent performance, with inhibition rates 99.4% 100% against Gram-positive Gram-negative bacteria, respectively. Recycling–reuse experiments biocompatibility evaluation material demonstrated are stable safe materials, indicating potential aspects medical implants.

Language: Английский

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Accelerated corrosion of 316L stainless steel in a simulated oral environment via extracellular electron transfer and acid metabolites of subgingival microbiota

Bioactive Materials, Journal Year: 2024, Volume and Issue: 35, P. 56 - 66

Published: Jan. 20, 2024

Language: Английский

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Semiconductive Biomaterials for Pathological Bone Repair and Regeneration

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(24)

Published: Feb. 19, 2024

Abstract Bone implant biomaterials are among the most used materials for clinical application. Despite significant advances in biocompatibility and osteoconductivity, conventional lack ability to cope with pathological microenvironment (inflammation, infection, residual tumors, etc.) during bone repair. Semiconductor have unique electrical, optical, ultrasound, thermal response properties, which facilitate non‐invasively controllably dynamic repair of defects. In this review, design synthesis a new generation semiconductor‐driven summarized, mechanism action semiconductive biomaterials' functional interfaces process tissues discussed, strategies problems encountered osseointegration is provided. Finally, review outlooks future implants defect

Language: Английский

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Electrocatalytic Generation of Singlet Oxygen via ROS-Mediated Redox Chain Reaction for Efficient Disinfection

Nano Letters, Journal Year: 2024, Volume and Issue: 24(23), P. 6939 - 6947

Published: May 30, 2024

The risk of harmful microorganisms to ecosystems and human health has stimulated exploration singlet oxygen (1O2)-based disinfection. It can be potentially generated via an electrocatalytic process, but is limited by the low production yield unclear intermediate-mediated mechanism. Herein, we designed a two-site catalyst (Fe/Mo–N/C) for selective 1O2 generation. Mo sites enhance generation precursors (H2O2), accompanied intermediate •HO2/•O2–. Fe site facilitates activation H2O2 into •OH, which accelerates •HO2/•O2– 1O2. A possible mechanism promoting through ROS-mediated chain reaction reported. as-developed electrochemical disinfection system kill 1 × 107 CFU mL–1 E. coli within 8 min, leading cell membrane damage DNA degradation. effectively applied medical wastewater. This work provides general strategy electrocatalysis efficient

Language: Английский

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Efficient metal bridged TiO2/Bi/BiOI photocatalyst for tetracycline degradation by defect mediated construction strategy

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 136384 - 136384

Published: Feb. 1, 2025

Language: Английский

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Synthetic fungal melanin UV absorbers

Science China Chemistry, Journal Year: 2024, Volume and Issue: 67(9), P. 3098 - 3110

Published: Aug. 13, 2024

Language: Английский

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Ultrasound-enhanced dual-responsive bismuth nanocatalysts for alleviating tumor hypoxia and promoting breast cancer sonodynamic-immunotherapy

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160292 - 160292

Published: Feb. 1, 2025

Language: Английский

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