MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Xu Liu,Peide An,Yide Han,Hao Meng,Xia Zhang
Cu-based nanozyme shows good oxidase-like activities due to the changeable states of Cu(II) and Cu(I), which are proven to be effective in the electron transfer in the redox process. Herein, the self-made MOF-818 with more Cu(II) loading was synthesized through a modified two-steps hydrothermal routes, which was then used as a sacrificial precursor to construct copper/zirconium composite oxides nanozymes (CN-MOF-818). The pyrolysis temperature was varied to obtain the best enzyme-like activities of the resulting CN-MOF-818. The laccase-like and catecholase-like activities were evaluated by using the oxidation of the mixture of 4-aminoantipyrine (4-AAP) and 2,4-dichlorophenol (2,4-DP), and 3,5-Di- tert -butylcatechol (3,5-DTBC) respectively. The enzyme-like activities were optimized through altering the catalytic conditions, and the corresponding enzyme catalytic kinetics including K m and V max were also determined. The enzyme-like mechanism of the CN-MOF-818 were also discussed based on EPR technique and the in-situ FT-IR analyses. In comparison with the pristine MOF-818 and the other reported Cu-based mimics, the as-prepared CN-MOF-818 exhibits the higher oxidase mimetic activities. These CN-MOF-818 can also be employed to detect the epinephrine with a low detection limit of 1.63 μM.
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JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Wen-Jin Zhang,Zi-Xing Zhou,Li Liu,Xin-Xin Zhong,Abdullah M. Asiri,Khalid A. Alamry,Fa-Bao Li,Nian-Yong Zhu,Wai-Yeung Wong,Hai-Mei Qin
Highly emissive copper halide complexes with a bidentate phosphine ligand have been paid much attention. Here, a series of four-coordinate mononuclear copper(I) halide complexes containing bi- and mono-dentate phosphine ligands, [CuX (dpmb)(PPh 3 )] (dpmb = 1,2-bis(diphenylphosphino)–4,5-dimethylbenzene, X = I ( 1 ), Br ( 2 ) and Cl ( 3 )), were synthesized, and their molecular structures and photophysical properties were investigated. These complexes exhibit intense blue emission in the solid state at room temperature and have peak emission wavelengths at 464–479 nm with microsecond lifetimes ( τ = 3.5−4.9 μs; Φ = 0.23−0.52). The emission of the complexes 1–3 mainly originates from MLCT, XLCT and intraligand transitions. Three complexes display moderate thermal stability.
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Nano Research
·
2024
·
IF 9.5
Dong Tian,Li Hongdong,Wang Zhenhui,Geng Yanling,Chang Rui,Tian Xiaofeng,Lai Jianping,Feng Shouhua,Wang Lei
Electrocatalytic CO 2 reduction reaction (CO 2 RR) in acidic media is a promising approach to overcome the unavoidable formation of carbonates in alkaline or neutral electrolytes. However, the proton-rich environment near the catalyst surface favors hydrogen evolution reactions (HER), leading to lower energy efficiency of the desired products, especially in industrial-level current densities. Here, quaternary ammonium cationic surfactant (cetyltrimethylammonium bromide (CTAB)) was introduced into acidic electrolyte to modulate the interfacial microenvironment, which greatly enhanced CO 2 electroreduction to formic acid (HCOOH) at the Bi/C nanoparticles electrode. Using a Bi/C nanoparticles electrode with CTAB added, constant production of formic acid was enabled with a cathodic energy efficiency of > 40% and maximum FE HCOOH (FE = Faradaic efficiency) of 86.2% at −400 mA·cm −2 over 24 h. Combined with in-situ attenuated total reflection Fourier transform infrared spectroscopy, the concentration of *OCHO intermediates significantly increased after CTAB modification, confirming that the hydrophobic interface microenvironment formed by dynamic adsorption of positively charged long alkyl chains on Bi/C nanoparticle electrodes inhibited HER and improved the selectivity of CO 2 RR to HCOOH.
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CARBON
·
2024
·
IF 10.5
Jian Yu,Xin Huang,Xinhao Chen,Pengyu Hu,Tao Liu,Tingting Zhang,Rui Cheng,Tingting Cui,Jun Li
The abuse of antibiotics leading to bacterial resistance has emerged as a significant impediment to wound healing. Consequently, this study developed antibacterial and anti-inflammatory bi-functional carbon dots (AAB-CDs) as the primary active material for the preparation of hydrogel wound dressings, aiming to promote wound healing. The synthesized AAB-CDs exhibited ultra-small size (2.3 nm), abundant surface functional groups, high Zeta potential (30.9 mV), and excellent biocompatibility. The positively charged AAB-CDs with outstanding antibacterial properties, mitigating the risk of bacterial resistance, while the abundant surface functional groups imparted stable antioxidant performance for sustained wound anti-inflammatory effects. Moreover, in vitro experiments demonstrated that the hydrogel dressings exhibited remarkable antibacterial properties against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), and significantly promoted the proliferation of L929 fibroblasts. In vivo experiments further substantiated the feasibility of the hydrogel dressings in promoting wound healing and histological analysis revealed the biological mechanisms underlying the promotion of wound healing. In conclusion, AAB-CDs with robust antibacterial and anti-inflammatory properties hold tremendous potential for promoting wound healing, providing practical insights for the biological application of CDs.
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RSC Advances
·
2012
·Vol. 2
·期 9
·3753-3758
·
IF 0
Jing Ma,Jia Chu,Liangsheng Qiang,Juanqin Xue
Bi-doped TiO2/SBA-15 (Bi–TiO2/SBA-15) was synthesized by a wet impregnation method. It was found that SBA-15 retained its ordered hexagonal mesostructure after incorporation of TiO2 and Bi. TiO2 nanoparticles and Bi species dispersed well and anchored both in the channel and the wall of SBA-15. The photocatalytic activity was evaluated on photodegradation of Rhodamine B (RhB) under visible light irradiation (λ ≥ 420 nm). Experimental results indicated that Bi–TiO2/SBA-15 exhibited higher photocatalytic activities than pure TiO2 and TiO2/SBA-15 owing to the synergetic effects of Bi species and TiO2. The degradation of RhB by these catalysts follows the pseudo-first-order kinetic model and Bi–TiO2/SBA-15 (2.0%) was found to be the best. The effect of Bi doping on the photocatalytic activity was investigated by the density functional theory (DFT) method. The calculated results indicated that Bi doping could improve the photocatalytic activity by extending the spectral response from UV to the visible region, making the Bi–TiO2/SBA-15 active under visible light irradiation.
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ChemistrySelect
·
2025
·Vol. 10
·期 27
·e01268
·
IF 2
Zhengfang Yang,Qianqian Guo,Qisheng Wang,Qing Wang,Guanbin Wen,Bin Zhang,Yanli Nie
Graphical Using macadamia nut shell from Yunnan as raw material to prepare antibacterial material can save resources. Combining NiO with AC, adding Bi and Fe to optimize antimicrobial properties and magnetic properties.A kind of antibacterial, adsorption-degradable, recyclable and reusable material was constructed.The composite materials show a good prospect in the practical application of water treatment. Although inorganic antibacterial materials that use photocatalytic technology are widely used to inhibit bacterial growth in water bodies, the external light environment limits the efficient utilization of photocatalytic antibacterial materials. The antibacterial materials are usually in powder form and are not conducive to recycling and reuse, limiting their development in practical applications. The main antibacterial ingredient (nickel oxide) was combined with Macadamia nutshell activated carbon (AC) to maintain efficient contact between bacteria and antibacterial active ingredients to apply the material for water treatment. First, different activators (H 3 PO 4 , ZnCl 2 , and KOH) were used to prepare activated carbon (AC) from Macadamia nutshells. Among the three activators, the AC prepared with H 3 PO 4 exhibited the largest specific surface area with well-dispersed pores. Then, Bi and Fe were doped to AC-NiO to improve their antibacterial and magnetic properties. After doping, the antibacterial rate increased to 95% with significantly improved magnetic properties. Moreover, AC-NiO/Bi and AC-NiO/Fe exhibited three antibacterial mechanisms: physical damage, ionic dissolution, and oxidative stress. Finally, the antibacterial test was performed on real water samples from Dianchi Lake in China. Results suggested that AC-NiO/Bi and AC-NiO/Fe could destroy microorganisms in river water samples. The material showed significant adsorption and degradation efficiency for malachite green, methylene blue, and methyl orange dyes. Since the composite material possessed excellent magnetic separation performance, it was easily recovered after use, effectively avoiding secondary pollution while reducing the material cost in practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiaolan Shi,Lu Yuan,Joop de Vries,Brandon W. Peterson,Jian Liu,Yijin Ren,Henny C. van der Mei
Due to the high resistance and complexity of biofilms, alternatives to traditional antibiotic treatments are urgently needed. Here, we investigated whether Pt nanoparticles grown on Bi 3 O 4 Br nanosheets (Pt NP /Bi 3 O 4 Br) can enhance the efficacy of the antibiotic ampicillin against biofilm-associated infections. X-ray photoelectron spectroscopy revealed abundant oxygen vacancies in the Bi 3 O 4 Br nanosheet creating an ideal surface for Pt nanoparticles growth. The obtained Pt NP /Bi 3 O 4 Br nanozyme had a uniform Pt nanoparticle distribution confirmed by X-ray powder diffraction and transmission electron microscopy with high-angle annular dark-field scanning. Compared to Bi 3 O 4 Br nanosheets alone, the nanozyme demonstrated significantly higher catalytic activity for reactive oxygen species generation facilitated by efficient electron transfer from Pt nanoparticles. When combined with ampicillin, Pt NP /Bi 3 O 4 Br nanozyme significantly enhanced bactericidal efficacy against both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli biofilms in vitro as shown by reduction in biofilm thickness and colony-forming units. In a murine skin infection model, the combination accelerated wound healing following S. aureus infection. Additionally, the combined treatment selectively reduced the pathogen Streptococcus mutans in human ex vivo oral biofilms while preserving the healthy human microbiome indicating potential applications in dental care. In conclusion, this work demonstrates that nanozyme-enhanced antibiotic therapy offers a promising strategy to combat biofilm-associated infections and antibiotic resistance.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dan Zhong,Zhiyong Liu,Qifang Ruan,Kun Guo,Bing Xie,Pu Mao,Haijun Sun
High dielectric loss and temperature-dependent dielectric constant are the main obstacles limiting the application of giant dielectric materials in microelectronic devices. Here, (Nb 0.5 Bi 0.5 ) x Ti 1- x O 2 (NBTO- x ) ceramics modified by defect cluster synergistic interfacial effects were designed to improve the dielectric properties, and the mechanism of the giant dielectric behavior was thoroughly investigated. The defect clusters formed by co-doping of Bi 3+ and Nb 5+ ions confined the free electrons to a limited range of jumps, leading to a significant increase in the dielectric constant and a decrease in the dielectric loss of the NBTO- x ceramics. Defect clusters aggregated near grain boundaries accumulated free electrons and carriers, which formed an interfacial effect with insulating grain boundaries, further reducing the dielectric loss. Thus, a high dielectric constant of 10 5 and a low loss of 0.04 at 1 kHz with a temperature stability of Δ ε′ / ε′ 25 °C ≤ ±15% (-55 °C to 105 °C) was obtained in the NBTO-0.5% ceramic. This study offers a new approach to the design of high-performing giant dielectrics with excellent potential for application in microelectronic devices.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Xianquan Li,Jifeng Pang,Yujia Zhao,Lin Li,Wenguang Yu,Feifei Xu,Yang Su,Xiaofeng Yang,Wenhao Luo,Mingyuan Zheng
The catalytic synthesis of 1,3-butadiene (1,3-BD) from bio-based ethanol offers an alternative and sustainable process beyond petroleum. However, the intrinsic active sites and corresponding mechanism of 1,3-BD formation have not been fully elucidated yet. By correlating systematic characterization results with catalytic performance, the open Zr species, i.e., Zr(OH)(OSi) 3 moieties, were identified as the active site over the Zr/MFI-BM catalysts for the catalytic transformation of ethanol-acetaldehyde into 1,3-BD. In conjunction with controlled experiments and theory calculations, ethanol and acetaldehyde are proposed to synergistically co-adsorb on the Zr(OH)(OSi) 3 species in a bi-molecular mode, which assists the acetaldehyde condensation and accelerates the critical Meerwein-Ponndorf-Verley-Oppenauer reduction, and accordingly promotes 1,3-BD formation. These findings will stimulate the search towards new metal-zeolite combinations for efficient production of value-added 1,3-BD via biomass-derived ethanol and beyond.
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ACTA MATERIALIA
·
2025
·
IF 9.3
Ziming Zhang,Chen Ming,Qingfeng Song,Lei Wang,Hanbing Chen,Jincheng Liao,Chao Wang,Lidong Chen,Shengqiang Bai
Mg 3 (Sb,Bi) 2 -based Zintl compounds are rising stars with superior features of high thermoelectric (TE) performance, nontoxicity and low cost. However, the poor thermodynamic stability hinders its practical application. Here, we propose a design strategy of modulating the local chemical composition with grain boundary (GB) phase guided by computational phase equilibrium diagrams. By in-situ constructing ZrSb 1- x second phase in the GB regions of Mg 3 (Sb,Bi) 2 -based compounds, the migration of Mg is blocked and the Mg deletion is depressed. Benefit from these, the driving force of Mg diffusion from matrix to GB and Mg migration along GBs is weakened, resulting in an improved thermal stability without degradation of electrical transport properties. The fabricated 8-pair TE module using GB modulated n-type Mg 3.1 Sb 1.5 Bi 0.49 Te 0.01 and p-type Ge 0.89 Cu 0.06 Sb 0.08 Te presents an efficiency of 8.9 % under the temperature difference of 450 K and shows excellent durability in the thermal cycling test. This study provides an effective strategy to improve thermal stability by constructing GB phase, and proves the feasibility of the practical application for Mg 3 Sb 2 -based TE modules.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Chaojun Liu,Yidong Jiang,Xin Gu,Jiongyuan Huang,Wei Yan,Kongfa Chen,Yixiang Shi,Jiujun Zhang
Liquid metal electrodes are attractive in the field of energy storage due to their remarkable attributes such as high safety, cost effectiveness, extended lifespan, and high energy density. In this study, we develop a liquid bismuth–air battery owing to the advantageous oxygen ion conductivity offered by bismuth trioxide (Bi 2 O 3 ). Meanwhile, a Sb 2 O 3 –CuO–SnO 2 ceramic with corrosion resistance and stable conductivity in both reductive Bi and oxidizing Bi 2 O 3 are employed as the anode current collector. Impedance spectrum analysis and cross-sectional microscopic characterization are consistent with the formation of a heterogeneous Bi–Bi 2 O 3 architecture, which may provide mixed ionic–electronic conduction within the anode during discharge. This behavior, as inferred from morphological and electrochemical data, correlates with a volumetric specific capacity of 3580 mAh/cm 3 (94.6 % of the theoretical capacity) and an areal capacity of 2326 mAh/cm 2 under the tested conditions. The high areal and volumetric capacities, together with stable operation observed for >200 h in our tests, indicate the potential of liquid Bi–air batteries for high-density, high-temperature energy storage.
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Catalysts
·
2025
·Vol. 15
·期 11
·
IF 4
Juan Du,Wanting Qiu,Sunbal Ayaz,Jian Long,Wenze Guo,Ling Zhao,Zhenhao Xi
2,5-furandicarboxylic acid (FDCA), a high-value biomass-derived monomer, serves as a crucial building block for sustainable polymers including polyesters, polyamides, and polyurethanes. This study systematically investigated the catalytic oxidation of 5-hydroxymethylfurfural (HMF) to FDCA over Pt/Al2O3and Pt–Bi/Al2O3catalysts. The 5Pt/Al2O3catalyst yielded 60.6% FDCA after 12 h under optimized conditions (80 °C, 0.1 MPa O2, 1 equiv. Na2CO3). Remarkably, Bi-modified 5Pt–1Bi/Al2O3catalyst dramatically enhanced catalytic performance, achieving 94.1% FDCA yield within 6 h under optimized conditions (80 °C, 1.5 MPa O2, 2 equiv. Na2CO3). Comprehensive characterization revealed that the exceptional activity originates from Bi–O–Pt interactions that modulate the electronic structure and oxidation state of Pt active sites, which facilitates the oxidation of intermediate 5-formyl-2-furancarboxylic acid (FFCA) to FDCA, the rate-limiting step of HMF oxidation. This work demonstrates an efficient Bi-promoted Pt catalytic system for FDCA production with significant potential for industrial application.
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