FOOD AND AGRICULTURAL IMMUNOLOGY
·
2023
·
IF 3
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
As a type of environmentally deleterious compound, 4-nitrophenol (4-NP) has become a global concern due to its extreme toxicity to aquatic organisms and humans. Herein, we used naturally available crayfish shells as precursors to prepare a new type of carbon dots (CDs) by the hydrothermal method. The as-synthesized CDs exhibited strong blue fluorescence emission which can be sensitively quenched by 4-NP through the static quenching effect because of the formation of a ground state complex between CDs and 4-NP. Accordingly, a facile and rapid fluorescence sensor was developed to detect 4-NP from 0 μM to 50 μM with a limit of detection (LOD) of 0.16 μM. Furthermore, the proposed sensor was successfully applied for the detection of 4-NP in fresh crayfish meat and aquatic water samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Yu Zhang,Ruxangul Jamal,Shuyue Xie,Abdukeyum Abdurexit,Tursun Abdiryim,Yaolong Zhang,Yanyan Song,Yajun Liu
Direct methanol fuel cells (DMFCs) are thought of as portable, sustainable, and non-polluting energy devices. The exploration of efficient and affordable catalysts for the methanol oxidation reaction (MOR) is significant for the industrial application of DMFCs. In this study, nitrogen-doped hollow carbon spheres (HCS) derived from polydopamine were proposed for the catalyst support for platinum nanoparticles (Pt NPs) for serving as the anode catalyst for DMFCs, and a composite support material was fabricated by in-situ oxidation of 3,4-ethylenedioxythiophene (ProDOT) with HCS to get core-shell structured poly(3,4-propylenedioxythiophene) (PProDOT)-embellished hollow carbon spheres (HCS) (PProDOT/HCS) for further improving the catalytic activity for supported catalyst. The results indicated that the platinum (Pt) on the surface of HCS was well dispersed, and the Pt became smaller and more evenly distributed with the introduction of PProDOT. Simultaneously, the Schottky junction formed between PProDOT and Pt NPs contributes to enhanced charge transfer and catalytic activity of the catalyst. Notably, the core-shell structure of the ternary catalyst, its excellent charge transfer capability, and the interaction between platinum and the support contribute to its high electrocatalytic activity. Electrochemical tests demonstrated that the PProDOT/HCS/Pt catalyst exhibited a mass activity of 1169.6 mA mg −1 Pt for methanol oxidation in acidic electrolytes, surpassing the activity of the HCS/Pt catalyst (472.4 mA mg −1 Pt ) and commercial Pt/C (281.0 mA mg −1 Pt ).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Jiying Men,Hongxing Shi,Chengya Dong,Yuanyuan Yang,Yuanrui Han,Ruixin Wang,Yiqing Zhang,Ting Zhao,Jun Li
A novel adsorbent with high adsorption capacity to remove cationic dyes was synthesized. Sodium 4-styrene sulfonate (SSS) was grafted polymerization on the surface of magnetic chitosan microspheres via -NH 2 /S 2 O 8 2− surface initiating system, obtaining MCS-g-PSSS microspheres. The grafted microsphere was characterized by Fourier transforms infrared spectroscopy , X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer and the Brunauer-Emmett-Teller. Cationic dyes were adsorbed by MCS-g-PSSS and methylene blue(MB) was acted as a typical example. The adsorption performance was explored by varying experimental conditions. The results showed the maximal adsorption capacity was 989 mg/g at pH 1 at 25 °C. The pseudo-second order model was found to be applicable for the adsorption kinetics . The adsorption capacity increased with rising temperature and it decreased owing to adding of ions. The adsorption isotherms were the best fitted by Langmuir. MCS-g-PSSS for MB showed high adsorption capacity due to the strong electrostatic interactions and π-π stacking, which was explained by FTIR and XPS and was verified by DFT calculations. The degree of adsorption spontaneity increased with rising the temperature. The grafted MCS-g-PSSS microspheres had high adsorption capacity for various kinds of cationic dyes and excellent for remove MB in the aqueous solution.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Guowen Zhang,Na Li,Ying Zhang,Junhui Pan,Deming Gong
4−Octylphenol (OP) is an environmental estrogen that can enter organisms through the food chain and cause various toxic effects. Here, the interaction between OP and human serum albumin (HSA) was explored through multipectral, molecular docking and dynamics simulation. The results showed that OP and HSA formed a ground state complex through a static quenching mechanism, and the interaction was spontaneously driven by hydrogen bonds and hydrophobic interaction forces. The binding constant at different temperatures was measured to be on the order of 10 5 L mol −1 . Site competition experiments suggested that OP interacted with amino acid residues Lys195, Cy245 and Cys246 located at the Sudlow site I of HSA, resulting in a more stretched protein peptide. The presence of OP increased the surface hydrophobicity of HSA, and reduced the content of α-helix in HSA by 3.4%. FT−IR spectra showed that OP interacted with the C=O and C-H groups of the polypeptide backbone. Molecular docking demonstrated that OP mainly bound to Site I of HSA and hydrogen bonds participated in the interaction. In addition, molecular dynamics simulations further explored the stability and dynamic behavior of the OP−HSA complex through RMSD, RMSF, SASA and Rg.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
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IF 5.88
Zideng Dai,Xinyu Xu,Zhaoming Guo,Kun Zheng,Xue-Zhi Song,Xiuyu Qi,Zhenquan Tan
Ultra-thin two-dimensional nanosheets have attracted increasing attention due to their great application prospects in nanomaterial science and biomedicine. Herein, we report the preparation of exfoliated raw and oxidized 4-layer Ti 7 O 13 (O-Ti 7 O 13 ) and their ability to produce reactive oxygen species (ROS). The results show that O-Ti 7 O 13 nanosheets can effectively produce ROS induced by X-ray irradiation. The 4-layer nanosheets can quickly load doxorubicin (DOX) within 5 min with a high loading rate to obtain a novel nanodrug system through their electrostatic adsorption capacity, and they exhibit a sustained release behavior. In this way, chemotherapy, radiation therapy and photodynamic therapy effectively combine for cancer synergistic treatment. We evaluated the cytotoxicity, cellular uptake and intracellular location of the O-Ti 7 O 13 nanosheet-based drug delivery system in A549 lung cancer cells. Our results show that the O-Ti 7 O 13 /DOX complex is more cytotoxic to A549 cells than free DOX since a low concentration of loaded DOX (10 μg/mL) with a low dose of X-rays can cause the complete apoptosis of tumor cells. This work reveals that the therapeutic effect of DOX-loaded O-Ti 7 O 13 nanosheets is strongly dependent on their loading mode, and the effects of chemotherapy and photodynamic therapy are enhanced under X-ray irradiation, which allows O-Ti 7 O 13 nanosheet use as a photo-activated drug carrier. This work provides a new strategy for preparing 2D metal oxide nanosheets toward biomedical applications.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2020
·Vol. 2020
·期 36
·3466-3473
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IF 2.529
Yongcen Lin,Xue Dong,Lang Zhao
Graphical In this paper, a highly efficient nano-catalyst was synthesized using thiosalicylic acid modified ZIF-(1:2.5) as precursor, which was used to catalyze the reduction of 4-nitrophenol, methyl orange, methylene blue, and congo red. The catalyst shows excellent performance. Mesoporous catalyst S-ZIF-(1:2.5)@Ni x S y was prepared using ZIF-(1:2.5) as a precursor. These composite materials were characterized by using scanning microscope (SEM), transmission electron microscopy(TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption techniques, and studied as catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), congo red (CR), methyl orange (MO), and methylene blue (MB). The BET specific surface area and pore volume of the catalyst were 167.49 m 2 /g and 0.32 m 3 /g respectively. The doping of S improves the catalytic performance of the catalyst. S-ZIF-(1:2.5)@Ni x S y showed an excellent catalytic rate ( k app = 22.3 × 10 –3 /s) in the experiment of reductive degradation of 4-NP. In addition, S-ZIF-(1:2.5)@Ni x S y also showed good catalytic activity for the degradation of CR, MB, and MO, completing the catalytic reaction within 60, 60, and 90 s, respectively. The k app values for CR, MB, and MO are 29.0 × 10 –3 /s, 44.0.0 × 10 –3 /s, and 29.2 × 10 –3 /s, respectively.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Yunlong Zhang,Ya Ma,Lishi Wang
A polyfurfural film and copper nanoparticle (Cu NP) modified glassy carbon electrode (GCE) was prepared for the electrochemical determination of 2,4,6-trinitrotoluene (TNT). The polyfurfural film and Cu NPs were prepared by a one-step electrochemical polymerization method and a one-step electrochemical deposition method, respectively. In order to obtain the optimum electrochemical performance, the degree of polymerization of furfural, the deposition time and deposition potential of copper, the enrichment time and enrichment potential of TNT detection, and the pH of the detection solution were optimized. Under the optimal experimental conditions, the modified glassy carbon electrode provided significantly enhanced electro-catalytic activity for TNT with a wide linear detection range from 0.05 to 6 ppm and a low detection limit of 0.0416 ppm due to the excellent synergistic catalytic properties of the polyfurfural film and Cu NPs. The electrode also showed excellent anti-interference ability, stability and reproducibility. Moreover, satisfactory results were obtained when the modified electrode was used for the determination of TNT in tap water samples, showing n excellent prospects for practical applications.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2020
·Vol. 97
·期 1
·1-4
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IF 2.008
Chen Wenming,Wang Haibo,Guo Xuan,Zhong Jinyi
Self-detoxifying materials for capturing and destructing chemical warfare agents (CWAs) have attracted intense attention in efficient personal protection and safe handling of contaminated materials. In this study, we reported an approach for synthesis of flexible Zr(OH) 4 -carbon fiber composite by sol–gel method. Activated carbon fibers serving as substrate carrier and adsorption conveyor could effectively make Zr(OH) 4 evenly distributed on the surface, which has excellent sorption properties and wide-ranging reactivity toward CWAs. The results demonstrated that the Zr(OH) 4 -carbon fiber composite could quickly remove (within 10 s) and 6-h degradation efficiency to 10-mg/mL sulfur mustard (HD) and O-ethyl S-(2-diisopropylamino)-ethyl methylphosphonothioate (VX) could reach 92.2 and 99.99%. In addition, it was found that Zr(OH) 4 -carbon fiber composite remained intact after adsorption, which could recollect resources and avoid Zr(OH) 4 leakage into waters. Therefore, the designed Zr(OH) 4 -carbon fiber composite will be a good potential application in precision equipment or skin decontamination equipment.
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LUMINESCENCE
·
2020
·Vol. 36
·期 2
·431-442
·
IF 1.855
Qian Liu,Feifei Zhao,Bingfeng Shi,Changli Lü
Carbon dots (CDs) with excellent optical properties are widely used in biomedicine, fluorescence sensing, and light-emitting diodes (LEDs). However, it is still a challenge to prepare CDs that can stably emit red fluorescence in the water environment. In this study, polydopamine-encapsulated luminescent carbon dots (CDs@PDA) with an encapsulating structure were synthesized at room temperature from p -phenylenediamine-derived red-light CDs as the core and using mussel-inspired chemical properties of polydopamine (PDA). In the binary system of water:ethanol = 1: 3 (volume ratio), the as-prepared CDs@PDA had a dual emission of ultraviolet light (330 nm) and red light (640 nm) with the fluorescence quantum yields of 8.0 and 15.5%, respectively, at the same time under 285 nm light excitation. The as-prepared CDs@PDA could be directly used for fluorescence selective sensing of 4-nitrophenol (4-NP) and Fe 3+ through simultaneously quenching of ultraviolet and red fluorescence based on the internal filtration effect mechanism with detection limits of 3.44 and 3.75 μM, respectively. This research showed that PDA-coated CDs can significantly improve the photoluminescence stability of CDs with new optical features. This means that the encapsulated structure of mussel chemistry is very helpful for expanding the application range of CDs in the water environment.
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MAIN GROUP CHEMISTRY
·
2020
·Vol. 19
·期 3
·217-225
·
IF 0.845
Qiao Gui-Ying,Li Su-Min,Niu Yun-Yin
One new compound consisting of 1,1-bis(4-pyridylthio)methylene ([Bpytm]) ligand, namely [Bpytm]CuI (1), has been prepared and characterized by IR spectroscopy, solid Uv-visible diffuse reflectance spectrum, and X-ray Powder Diffraction (PXRD). Compound 1 is a 2D MOF and ligand [Bpytm] coordinate with metal ions to form tetrahedral configuration. For compound 1: Crystal system: Monoclinic, Space group: C2/c, a = 13.6671(11), b = 11.6075(11), c = 17.1225(12), α= 90°, β= 93.707(3)°, γ= 90°, V = 2710.6(4) Å3, Z = 8, Dcalc = 2.082 g cm–3. The photocatalytic properties and thermal stability have been researched.
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ChemElectroChem
·
2020
·Vol. 7
·期 20
·4239-4244
·
IF 4.154
Fan Yuan,Mohamed Ibrahim Halawa,Xiangui Ma,Abubakar Abdussalam,Baohua Lou,Guobao Xu
Graphical Shine and detect : Oxamic hydrazide (OHA) can dramatically increase the electrochemiluminescence (ECL) intensity of Ru(bpy) 3 2+ on glassy carbon electrode (GCE). 4-Nitrobenzaldehyde (4-NBA) can react with OHA to form a hydrazone product through nucleophilic addition, inducing a significant quenching on the ECL intensity of the developed Ru(bpy) 3 2+ /OHA system. Based on this, a sensing platform of 4-NBA was constructed. Oxamic hydrazide (OHA) was utilized as an efficient coreactant of Ru(bpy) 3 2+ for the first time, which can dramatically increase the electrochemiluminescence (ECL) intensity of Ru(bpy) 3 2+ on glassy carbon electrode (GCE). 4-nitrobenzaldehyde (4-NBA), a nitroaromatic compound, has mutagenic and carcinogenic toxicity on humans′ genome and causes a serious impact on the environment. Hence, the detection of its level in biological and environmental samples is of great significance. Interestingly, 4-NBA was found to induce a dramatic quenching for the ECL intensity of the developed Ru(bpy) 3 2+ /OHA system owing to the formation of hydrazone product through the nucleophilic addition reaction with OHA. Under optimal conditions, the ECL decreasing value of Ru(bpy) 3 2+ /OHA in the presence of 4-NBA is linear in the range of 20 μM to 800 μM with a limit of detection (LOD) of 1.09 μM (signal-to-noise 3 : 1). Finally, this strategy enabled the detection of 4-NBA in tap water with satisfactory recoveries from 97.84 % to 103.56 %.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-7
·
IF 6.232
Sun Ye,Zhang Yao,Wang Yue,Xia Lixin
A new sensor for determination of Ag + ion (Ag + ) by surface-enhanced Raman scattering (SERS) is reported. Gold nanoparticles (AuNPs) and 4-aminodiphenyl disulfide (APDS) were chosen as the SERS substrate and probe molecule, respectively. With the addition of Ag + , three new peaks (1141, 1392, and 1435 cm −1 ) appeared in the SERS spectrum, indicating that the conversion of APDS to p , p ′-dimercaptoazobenzene (DMAB) was achieved. As the concentration of Ag + increased, the conversion of APDS to DMAB also increased and showed a good linear relationship ( R 2 = 0.9746) in the range of 10 to 100 μM of Ag + . The limit of detection (LOD) was 7 μM. Compared with the traditional determination method, the SERS method is convenient and fast and requires no complicated preprocessing.
Graphical abstract
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危险品化学品经营许可证（带存储）