CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Huajing Zhou,Huichang Dong,Jinghao Wang,Yuancai Chen
A novel controllable mesoporous core–shell microsphere (Co/Fe 3 O 4 @PZS) is synthesized by polycondensation, and used as ORR electrocatalyst in the heterogeneous electro-Fenton (hetero-EF) reaction. Characteristic analysis indicated that PZS offered massive reactive sites for anchoring Co ions on the shell. Heteroatom Lewis acidic active sites, related with pyridinic N (4.15%), P = N/P-N (6.46%) and S = O (3.19%) bonds, were formed through the replacement of C = C groups with the N-P-S doped at the shell, which benefited the activating/generating reactive oxygen species (ROS), and capturing/degrading the target pollutant substrates. Moreover, PZS shells prevent the nano-Fe 3 O 4 crystals in the core from direct contact with the solution, which would greatly improve the stability of electrode with almost no leaching of Fe/Co ions after six successive runs. Electrochemical experiments confirmed the accelerating electron transfers among ≡Fe II/III /≡Co II/III by the direct electric activation, as evidenced by the decreasing potential discrepancy (from 0.175 to 0.123 V) and sharply increasing ring current (from 35 to 200μA), markedly improved the ORR toward two-electron process (n = 2.01). ESR and radical scavenging experiments verified that •OH and 1 O 2 served as the main ROS in the Co/Fe 3 O 4 @PZS hetero-EF system. In addition to the two-electron reduction ( O 2 → H 2 O 2 → Â · O H ), O 2 could also be directly electro-activated to 1 O 2 via one-electron reduction ( O 2 → Â · O 2 - / Â · HO 2 - → 1 O 2 ). Additionally, the regenerating/reducing of ≡Fe III /Co III could get the electron directly from the cathode without excess consumption of H 2 O 2 , all these could eventually facilitate BPA degradation with lower energy consumption (1.318 kWh m −3 ). This study provides a reliable and facile route to prepare mesoporous core–shell microsphere, and developed as doped cathode in the field of electro-Fenton electrocatalysis process.
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高影响因子
Microbiology Spectrum
·
2022
·Vol. 10
·期 4
·
IF 9.043
Mohamed Sharaf,Alaa H. Sewid,H. I. Hamouda,Mohamed G. Elharrif,Azza S. El-Demerdash,Afaf Alharthi,Nada Hashim,Anas Abdullah Hamad,Samy Selim,Dalal Hussien M. Alkhalifah,Wael N. Hozzein,Mohnad Abdalla,Taisir Saber
Surface-growing antibiotic-resistant pathogenic bacteria such as Escherichia coli and Staphylococcus aureus are emerging as a global health challenge due to dilemmas in clinical treatment. Furthermore, their pathogenesis, including increasingly serious antimicrobial resistance and biofilm formation, makes them challenging to treat by conventional therapy. Therefore, the development of novel antivirulence strategies will undoubtedly provide a path forward in combatting these resistant bacterial infections. In this regard, we developed novel biosurfactant-coated nanoparticles to combine the antiadhesive/antibiofilm properties of rhamnolipid (RHL)-coated Fe3O4 nanoparticles (NPs) with each of the p-coumaric acid (p-CoA) and gallic acid (GA) antimicrobial drugs by using the most available polymer common coatings (PVA) to expand the range of effective antibacterial drugs, as well as a mechanism for their synergistic effect via a simple method of preparation. Mechanistically, the average size of bare Fe3O4 NPs was ~15 nm, while RHL-coated Fe3O4@PVA@p-CoA/GA was about ~254 nm, with a drop in zeta potential from −18.7 mV to −34.3 mV, which helped increase stability. Our data show that RHL-Fe3O4@PVA@p-CoA/GA biosurfactant NPs can remarkably interfere with bacterial growth and significantly inhibited biofilm formation to more than 50% via downregulating IcaABCD and CsgBAC operons, which are responsible for slime layer formation and curli fimbriae production in S. aureus and E. coli, respectively. The novelty regarding the activity of RHL-Fe3O4@PVA@p-CoA/GA biosurfactant NPs reveals their potential effect as an alternative multitarget antivirulence candidate to minimize infection severity by inhibiting biofilm development. Therefore, they could be used in antibacterial coatings and wound dressings in the future.IMPORTANCE Antimicrobial resistance poses a great threat and challenge to humanity. Therefore, the search for alternative ways to target and eliminate microbes from plant, animal, and marine microorganisms is one of the world’s concerns today. Furthermore, the extraordinary capacity of S. aureus and E. coli to resist standard antibacterial drugs is the dilemma of all currently used remedies. Methicillin-resistant S. aureus (MRSA) and vancomycin-resistant S. aureus (VRSA) have become widespread, leading to no remedies being able to treat these threatening pathogens. The most widely recognized serotypes that cause severe foodborne illness are E. coli O157:H7, O26:H11, and O78:H10, and they display increasing antimicrobial resistance rates. Therefore, there is an urgent need for an effective therapy that has dual action to inhibit biofilm formation and decrease bacterial growth. In this study, the synthesized RHL-Fe3O4@PVA@p-CoA/GA biosurfactant NPs have interesting properties, making them excellent candidates for targeted drug delivery by inhibiting bacterial growth and downregulating biofilm-associated IcaABCD and CsgBAC gene loci.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuezhen Mao,Rongna Chen,Huanhuan You,Yang Liu,Sunrui Luan,Li Hou,Faming Gao
Antimony-based anodes possessing advantages of stable operating voltage and high theoretical capacity can replace graphene as alloy-based electrodes material in LIBs applications. However, the problems of capacity decaying and poor stability of Sb-based materials due to volume expansion and structural crushing during the long-term cycling remain to be solved. Therefore, we propose a strategy of using S and N co-doped carbon nanofibers encapsulated with Sb nanoparticles to overcome the above problems. The proposed material exhibits an excellent lithium storage performance with a high reversible specific capacity of 734 mAh g −1 at 0.1 A g −1 after 50 cycles (474.8 mAh g −1 at 1 A g −1 after 800 cycles, 394.5 mAh g −1 at 2 A g −1 after 2000 cycles). Importantly, a specific capacity of 288.5 mAh g −1 remains after more than 5000 cycles. The superior electrochemical performance of the S and N co-doped electrode is attributed to the proven structure and stability of the carbon matrix alleviating the volume changes of Sb during the process of lithium intercalation and extraction. The alloying/de-alloying reactions of the S@Sb@N-CNFs composite in the first charging/discharging process were systematically investigated by ex-situ XRD . This strategy of S and N co-doped carbon matrix could establish Sb-based materials as potential high-performance anodes for LIBs.
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高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Xuedong Jing,Na Lu,Jindou Huang,Peng Zhang,Zhenyi Zhang
Engineering lattice defects in two-dimensional (2D) sulfide semiconductors has been accepted as an effective strategy to enhance the efficiency of the solar-to-fuels conversion. Although many researches have proven the lattice defect-mediated photocatalytic activity of ZnIn 2 S 4 , the artificial control of S-defects for optimizing the charge-carrier kinetics process in ZnIn 2 S 4 has long been a challenging task. Herein, we report a facile one-step method to modulate the lattice S-content of ZnIn 2 S 4 microflowers (MFs) only through adjusting the used amount of S-precursor in the hydrothermal solution that contains the metal precursors with a fixed Zn/In stoichiometric ratio at 1:2. We also demonstrated that the S-vacancies at the In facets were the main type of lattice defects in the formed ZnIn 2 S 4 MFs, which could enhance both the separation and migration processes of the photoinduced charge-carriers due to the existence of discrete defect energy-levels (DELs) and the reduced effective mass of electrons, as evidenced by the first-principles calculations and the electron spectra analyses. The ZnIn 2 S 4 MFs with the optimal content of S-vacancy obtained by a hydrothermal treatment of the precursors with the Zn/In/S stoichiometric ratio of 1:2:8 possessed the long-lived photoinduced electron (~94.64 ns) for contributing to the photo-physical and -chemical processes. Thus, upon visible light irradiation, the H 2 -evolution rate of this sample reached ~ 2.40 mmol h −1 g −1 with an apparent quantum efficiency of ~ 0.16% at 420 nm even though only using 5 mg of photocatalysts without any cocatalysts .
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高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2020
·
IF 2.304
Muhammad Usman,Haojie Yu,Li Wang,Jianguo Qian,Xuefeng Li,Amin Khan,Kaleem-ur-Rehman Naveed,Ahsan Nazir,Tarig Elshaarani,Shah Fahad
A series of copolymers of poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -methacrylic acid)s (P(FHEMA- co -MAA)s) were synthesized as burning rate catalysts (BRCs). Their structures were verified using proton nuclear magnetic resonance ( 1 H NMR) and Fourier transforms infrared (FT-IR) spectroscopy. The electrochemical behavior of P(FHEMA- co -MAA)s was investigated by cyclic voltammetry (CV). The CV results indicated that P(FHEMA- co -MAA)s showed redox behavior. Anti-migration test proved that P(FHEMA -co- MAA)s possesses better anti-migration properties than ferrocene (Fc) and 2, 2-bis (ethylferrocenyl) propane (Catocene). The burning rate (BR) catalytic effect of P(FHEMA -co- MAA)s on thermal decomposition of AP was examined through thermogravimetry (TG) and differential thermogravimetry (DTG). P(FHEMA -co- MAA)s were found to have high catalytic effects in accelerating thermal decomposition of ammonium perchlorate (AP).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Shan Yan,Lina Xu,Jun Jiang,Hongping Xiao,Xinhua Li
Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed Co 3 O 4 /NiCo 2 O 4 /NiO/C&S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400 °C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy , Brunauer–Emmett–Teller specific surface area analysis, and elemental analysis . The electrochemical performance is analyzed by cyclic voltammetry , galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry . A uniform nanocomposite was found to be formed of NiCo 2 O 4 , NiO, and Co 3 O 4 nanoparticles , incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared Co 3 O 4 /NiCo 2 O 4 /NiO/C&S composite will be promising for commercial applications.
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高影响因子
DESALINATION
·
2024
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IF 8.3
Xinran Zhao,Jun Yang,Jinyang Peng,Yang Liu,Heng Zhang,Chao Yan,Minjie Shi
Innovations in electrode materials profoundly impact the performance breakthroughs of capacitive deionization (CDI) technology. Organic compounds with electrochemical activity constitute a significant family of electrode materials for CDI systems. However, many of them face challenges such as insufficient active sites and dissolution in the aqueous electrolyte during the electrosorption processes. The present study focuses on molecular engineering design of a novel sulfur heterocyclic organic compound , dibenzo[ b , i ]thianthrene-5,7,12,14-tetraone (DTT) through an in situ sulfidation reaction. The DTT molecule extends the π-conjugated plane of the previous 2,3-dichloro-1,4-naphthoquinone (2,3-d-1,4-NQ) through C S bonding, enhancing structural stability and significantly reducing the band gap (3.96 to 2.29 eV). Additionally, the number of redox-active groups (C=O) has doubled from 2 to 4, thereby resulting in the improved capability of pseudocapacitive interactions with NH 4 + . In situ Raman spectroscopy , combined with relevant ex situ characterization, has verified the redox mechanism of multiple C O in DTT. As electrode, DTT exhibits a high specific capacitance of 614.8 F g −1 (280 cycles at 1 A g −1 ) and maintains a capacitance retention of 91.8 % after 10,000 cycles at 10 A g −1 . Additionally, DTT is applied in CDI for the NH 4 + capturing, which exhibits a high NH 4 + adsorption capacity of 72.1 mg g −1 and a rapid NH 4 + removal rate of up to 9.2 mg g −1 min −1 (at 1.2 V) in CDI devices. The stable cyclic regeneration and favorable specific energy consumption promote the potential of DTT as a Faradaic electrode material for CDI applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuanzhi Yue,Guozhe Sui,Yan Zhuang,Dongxuan Guo,Shuang Meng,Dantong Zhang,Xue Yang,Ning Liu,Yue Li,Jinlong Li
In this study, we developed a synergistic modulation strategy through in situ dual-anion/cation doping coupled with vacancy engineering, demonstrating a direct ammonia etching approach to synthesize Cu/S-In(OH) 3 with controlled indium vacancies (V In ) from CuInS 2 precursors. This in situ doping approach provides a uniform distribution of Cu cations and S anions throughout the material, overcoming conventional doping heterogeneity. Simultaneously, an indium vacancy (V In ) structure was precisely engineered and regulated through a growth limitation strategy. The synergistic interplay between the uniformly dispersed anions, cations and V In significantly suppresses the recombination of photogenerated carrier within In(OH) 3 , thereby allowing more carriers to participate in the surface catalytic reaction. Both experimental and theoretical analyses demonstrate that the introduction of V In into the defective states leads to a direct reduction in the band gap, significantly improving photocatalytic hydrogen evolution performance. The optimized Cu/S-In(OH) 3 with V In achieves a photocatalytic hydrogen production rate of 1.22 mmol g −1 h −1 , approximately 122 times higher than that of pure In(OH) 3 (0.01 mmol g −1 h −1 ). This work establishes a paradigm of integrating in situ doping and vacancy engineering strategies to rationally design In(OH) 3 -based materials, offering generalizable principles for advanced catalytic applications.
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产品关联
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高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
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2025
·
IF 5.4
Huimei Zhao,Haiyan Zhang,Jianyu Shi,Yanru Liu,Jingao Yu,Yuangui Yang,Jingyu Weng,Zhongxing Song,Rui Zhou,Hong Min,Jian Yao,Mei Wang,Zhen Zhang
Ethnopharmacological relevance Asthma is a chronic inflammatory airway disease. Current treatments have limited efficacy and often cause severe side effects. Wuwei Shaji Powder (WSP), a traditional Mongolian remedy, is used for treating chronic pulmonary diseases, but its efficacy against asthma and underlying mechanisms are still unclear. Aim of the study To investigate the therapeutic effect of WSP on asthma and elucidate its molecular mechanisms. Materials and methods An ovalbumin (OVA)-induced allergic asthma model was established in rats. Ferroptosis or apoptosis was induced in BEAS-2B cells using Erastin or CdCl 2 . Various techniques including histopathological staining, ELISA, Western blot, flow cytometry, and transmission electron microscopy were employed to assess WSP's effects and mechanisms. Results WSP alleviated OVA-induced allergic asthma in rats without the immunosuppressive side effects observed with dexamethasone. WSP suppressed ferroptosis in bronchial epithelial cells both in vivo and in vitro. It reduced thiol- and sulfonic-based oxidative stress through Keap1 S-sulfhydration, disrupted the Keap1-Nrf2 interaction, and promoted Nrf2 nuclear translocation. Notably, we discovered that CdCl 2 can induce ferroptosis in BEAS-2B cells, and WSP prevented both ferroptosis and apoptosis in these cells. Conclusion WSP alleviates OVA-induced allergic asthma by protecting bronchial epithelial cells from ferroptosis via S-sulfhydration of Keap1, providing new insights for its clinical application.
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PubMed
高影响因子
BIOORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ji Ding,Jinsong Song,Shengbo Huang,Chuanhua Zhou,Feng Xue
Enantiomerically pure 2-oxazolidinones are widely used as chiral auxiliaries in organic synthesis, but there is an unmet need for more effective methods to access these compounds. Here we report the identification and semi-rational engineering of the halohydrin dehalogenase Sl HHDH from Sneathiella limimaris for the highly enantioselective ring-opening of phenyl glycidyl ether (PGE) with cyanate to yield ( S )-5-phenoxymethyl-2-oxazolidinone. After single and combinatorial mutagenesis, the best enantioselective triple mutant, F15W/A137T/N179L achieved an enantioselectivity of 97 %, with an E valu e of 154. In addition, it could accept a wider range of PGEs to generate corresponding ( S )-5-phenoxymethyl-2-oxazolidinones, whereby the product ee values increased from less than 5 % in wild-type Sl HHDH to between 81 and 96 % in the triple mutant. Structural analysis of Sl HHDH and mutant F15W/A137T/N179L in complex with the substrate PGE showed that changes of the substrate-binding pocket in the mutant position R- PGE farther from the catalytic residues, which may explain the enhanced enantioselectivity. This mutant has great potential as a biocatalyst for the first synthesis of chiral ( S )-5-phenoxymethyl-2-oxazolidinones.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Danli Tang,Dengjie Zhong,Yongxian Zhou,Yunlan Xu,Tanxia Xiang,Wantao Li,Yuanfang Yang,Chunmiao Fan,Jisai Chen
Dye pollution has caused great harm to the ecological environment. In this paper, N and S co-doped biochar (K-NSBC) was obtained by a calcination–alkali activation method, then Co/Al layered double hydroxide (Co/Al-LDH) was anchored on it by a co-precipitation method to activate ozone (O3) to degrade methylene blue (MB). When the O3 concentration was 3.12 mg L−1, catalyst dosage was 0.6 g L−1, the MB concentration was 25 mg L−1, and pH was 6.8, the degradation efficiency of MB reached 99.65%. The degradation efficiency still remained at 92.75% even after Co/Al-LDH@K-NSBC was recycled five times. The results of material characterization and quenching experiments show that the presence of oxygen vacancies (Ov) on the metal surface not only accelerates the exchange of oxygen and the generation of active free radicals, but also promotes the conversion of Co3+/Co2+ and the activation of O3. Pyridine N, graphite N and thiophene S provide electron-rich groups, which promote the activation of O3 to produce reactive oxygen species (ROS). Among them, 1O2 is the main ROS leading to the degradation of MB, and its intermediates ˙OH and ˙O2− also participate in the oxidation of MB. This study is expected to provide new ideas and directions for the design of highly efficient and stable ozonation activators and industrialization of non-phase catalytic ozonation degradation of dye wastewater.
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产品关联
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高影响因子
LUMINESCENCE
·
2025
·Vol. 40
·期 4
·e70175
·
IF 3
Jiaoyan Xie,Suqin Han
Folic acid (FA) is a crucial B vitamin for cell formation and maintenance, and its deficiency can lead to severe health disorders, highlighting the importance for accurate FA detection. Chemiluminescence (CL) provides a highly sensitive analytical approach, characterized by simple instrumentation, high accuracy, and low background interference. However, traditional CL techniques are often limited by weak signal intensity and poor robustness. This study presents a novel CL system using well-defined fluorescent Cl, S, N co-doped carbon dots (ClSN-CDs) integrated into the H 2 O 2 -KBrO 3 system. Under acidic conditions, the synergistic effect of H 2 O 2 and KBrO 3 induced ClSN-CDs to emit a strong CL signal, with the emitting species identified as excited-state ClSN-CDs. Trace amounts of FA significantly quenched the CL intensity of the ClSN-CDs-H 2 O 2 -KBrO 3 system, enabling rapid, sensitive, and selective FA detection. The system demonstrated a linear response to FA concentrations ranging from 0.02 to 1.0 μM, with a detection limit of 3.1 nM. Selectivity and recovery studies validated the system's robust analytical performance. Mechanistic investigations revealed that the CL reaction involved reactive oxygen species (ROS), and FA-mediated ROS consumption led to luminescence suppression.
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PubMed
高影响因子
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