MOLECULES
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2023
·Vol. 28
·期 16
·6103
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IF 4.6
Lanlan Wei,Yanan Chen,Dongliang Shao,Jingjun Li
In this work, a sensitive analytical method based on packed-nanofiber solid-phase extraction (PFSPE), after derivatization with trichloroacetic acid and high-performance liquid chromatography with a fluorescence detector (HPLC-FLD), has been established for the determination of aflatoxins (AFs) in milk. Polystyrene polymeric multi-walled carbon nanotube (PS-MWCNT/OH) composite nanofibers were fabricated by electrospinning and used to prepare homemade extraction columns. The extraction efficiency of the HPLC-FLD analysis method was sufficiently investigated and validated. After the implementation of optimal conditions, all of the analytes were separated efficiently and the components of the milk matrix did not disturb the determination. The obtained linear ranges of the calibration curves were 0.2–20 ng/mL for AFTB1 and AFTG2, 0.1–10 ng/mL for AFTB2, and 0.4–40 ng/mL for AFTG1. The recoveries ranged between 80.22% and 96.21%. The relative standard deviations (RSDs) for the intra-day and inter-day results ranged from 2.81–6.43% to 3.42–7.75%, respectively. Generally, 11 mg of sorbent and 200 μL of elution solvent were used to directly extract all of the AFs from the milk matrix. Reported herein is the first utilization of PS-MWCNT/OH-PFSPE HPLC-FLD to simultaneously analyze the occurrence of aflatoxins in milk.Keywords:aflatoxins;packed-nanofiber solid-phase extraction (PFSPE);sample preparation;polystyrene polymeric multi-walled carbon nanotube (PS-MWCNT/OH);milk
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wenwu Zou,Zhenze Xie,Chang Du
Basic copper chloride (Cu 2 (OH) 3 Cl) microspheres with different surface nanostructure were synthesized via the dissolution regulation of calcite in CuCl 2 solution. We studied the influence of CuCl 2 concentration, reaction time and reaction temperature on the formation of Cu 2 (OH) 3 Cl, and the products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy , field emission scanning electron microscopy and transmission electron microscopy . The concentration of CuCl 2 has a great influence on the dissolution rate of calcite, dispersed microsphere particles assembled by nano-blocks formed in 20 mM CuCl 2 solution. The surface of Cu 2 (OH) 3 Cl microsphere change from nano-block to nano-rod with increasing the reaction time from 20 min to 2 h Cu 2 (OH) 3 Cl microspheres with surface structure changed from nano-sheet, nano-plate to nano-block with the reaction temperature increase from 37 °C to 70 °C. The Cu 2 (OH) 3 Cl microsphere also displays superior antibacterial properties against S. aureus and E. coli . This work displays a new strategy to synthesize functional materials by the use of dissolution regulation methods.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Runren Jiang,Guanghua Lu,Tianjian Dang,Min Wang,Jianchao Liu,Zhenhua Yan,Haijiao Xie
The difficult separation of products after photocatalytic degradation of microplastics (MPs) limits the in-depth analysis of the MPs fragmentation process and degradation mechanism, and there are no studies about the photocatalytic degradation of functional groups modified MPs. In this work, we synthesized a “dissolvable” BiOBr-OH semiconductor-organic framework (SOF) to degrade polystyrene (PS) MPs modified by different functional groups, including –OH, –NH 2 , -SO 3 H, –COOH and -epoxy. First, a series of characterization confirmed that small molecules were intercalated into BiOBr layers to construct BiOBr-OH SOF. The BiOB-OH SOF system has significantly enhanced the photocatalytic degradation performance of microplastics, and BiOB-OH-0.75 has the strongest catalytic performance. The photocatalytic degradation performance of different functional groups modified PS-MPs differed significantly, with the weight loss order being -epoxy > –NH 2 > –OH > –COOH > -SO 3 H. After dissolving the catalyst, clean nano plastic particles were obtained after degradation, and it was found that six types of PS-MPs exhibited three different types of fragmentation processes. The surface potential of and fragmentation mode of different PS-MPs dominated the adsorption and photocatalytic degradation of BiOBr-OH SOF. The degradation products of PS-MPs are mainly composed of styrene and functional group-modified monomer molecules and multimolecular complexes. In addition, by analyzing the toxicity of the degradation products of microplastics, it was found that solid products were the main reason for their enhanced toxicity. Finally, based on the photoelectrochemical characterization and free radical analysis, the mechanism of photocatalytic degradation of different functional groups modified PS-MPs by BiOBr-OH SOF was proposed.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qinghan Chen,Li Wang,Dehui He,Bo Xiao,Xia Ran,Rong Li,Hong Xu,Jian Feng
A novel [email protected] 5 O 7 I/Bi(OH) 3 (AB) heterojunction was prepared and the enhanced photocatalytic antibacterial activity against Escherichia coli ( E. coli ) under visible light excitation was exhibited. 3 %AB (containing 3 wt% of Ag) presented best photocatalytic performance, and all of E. coli cells were inactivated within 5 min under natural solar light irradiation. The photocatalytic antibacterial mechanism of AB heterojunction was corroborated by SEM, live/dead cell staining and SDS-PAGE assay. The destruction of the cell membrane, the leakage of the intracellular protein and the decomposition of the protein were considered as the events occurred in the antibacterial process. The radical capture experiment confirmed that •O 2 – and e – played the dominant role in the destruction of the cell membrane and the decomposition of the protein. The improvement of the photocatalytic activity can be mainly ascribe to the construction of heterojunction, SPR effect resulted from Ag deposition, enhanced visible light absorption and more surface oxygen vacancies. These factors are advantageous to the generation of the photogenerated electrons and holes, and improve the spatial separation efficiency of the photogenerated charge. This study presented a promising [email protected] 5 O 7 I/Bi(OH) 3 heterojunction as the photocatalyst for the potential application in the treatment of the bacterial contamination.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1479-1486
·
IF 2.8
Liu Yang,Chen Han,Lou Xiaoming,Wen Xiaoyu,Yin Zhenguo,Xiang Kaixiong
Rechargeable aqueous ammonium-ion batteries (AAIBs) have attracted more and more attention in energy storage devices because of great safety and cost-effectiveness, as well as excellent rate capability. Recently, it is the main exploration focus for the further improvement of AAIBs to develop suitable electrode materials. Herein, titanic acid and TiO 2 were simply synthesized by the facile co-precipitation approach. Titanic acid showed higher capacity of 104.5 mAh g −1 at the 0.1 A g −1 current density, and higher cyclability with the 91.2% capacity retention cycled 1000 cycles at 1 A g −1 . Titanic acid is promising as aqueous ammonium-ion batteries with great stability and capacity.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 28
·16969-16978
·
IF 10.733
Tianxing Wu,Miaomiao Han,Xiaoguang Zhu,Guozhong Wang,Yunxia Zhang,Haimin Zhang,Huijun Zhao
Deeply understanding the electrochemical activation and inactivation processes of an electrocatalyst is critically important for establishing a high-efficiency nitrogen reduction reaction (NRR) to synthesize an NH3 system. Here we report the utilization of a facile vapor-phase hydrothermal (VPH) method to directly grow ultrafine Nb3O7(OH) nanoparticles on commercial carbon fiber cloth (Nb3O7(OH)/CFC) for the NRR. The results demonstrate that the Nb3O7(OH)/CFC can afford an average NH3 yield rate of 622 μg h−1 mgcat.−1 with a high faradaic efficiency (FE) of 39.9% at −0.4 V versus the reversible hydrogen electrode (RHE) in 0.1 M Na2SO4 electrolyte (pH = 6.1) within 30 min of the NRR, surpassing the performance of most recently reported aqueous-based NRR electrocatalysts. The experimental and theoretical calculation results reveal that the in situ electrochemically converted NbO from Nb3O7(OH) during the NRR is the catalytic active phase with a N2 adsorption free energy of −0.97 eV; however with a reaction time over 30 min, the generated active *N atoms in the *N–NH3 → *N + NH3 hydrogenation step during the NRR are thermodynamically favourable for binding to the oxygen vacancies of NbO to form oxygen-containing NbN0.64 with reduced N2 adsorption free energy (−0.32 eV), resulting in significantly decreased NRR activity. Our studies suggest that although NbO possesses high NRR activity, it may not be a suitable NRR electrocatalyst, owing to easy formation of low active niobium oxynitride during the NRR.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Jingcheng Du,Cailong Zhou,Zhijie Yang,Jiang Cheng,Yuanyuan Shen,Xinjuan Zeng,Luxi Tan,Lichun Dong
The economic and green synthesis of metal-organic frameworks (MOFs) is of great significance. In this work, a facile method for preparing HKUST-1 MOFs at room temperature with insoluble Cu 2 (OH) 2 CO 3 particles and film as the precursors was developed. The as-prepared HKUST-1 MOFs were characterized by using the XRD , Raman spectrum , FTIR, XPS and N 2 adsorption-desorption analyses, and the wetting property of the HKUST-1 film was also evaluated. The results demonstrated that the MOF film decorated copper mesh possesses the promising underwater superoleophobicity and underoil superhydrophobicity, with the contact angles of non-wetting liquids larger than 150°. The on-demand oil/water separation was subsequently realized through a prewetting method, obtaining the high separation efficiency up to 97%. The facile route by using solid precursors developed in this work might provide a new strategy for preparing MOFs, and the special wetting properties of the as-prepared materials could enrich the applications of MOF films as well.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Huichang Li,Senlin Wang,Junhui Ye,Weijun Liang,Yanxiu Zhang,Jian Gu
A unique 3D hierarchical mesoporous Al-doped α-Ni(OH) 2 /reduced graphene oxide (NH/rGO) composite for supercapacitor has been successfully synthesized via homogeneous precipitation method. In this process, urea as the alkali source and mild reducing agent, to make graphene oxide (GO) convert into rGO. Thus, The NH uniformly grew on the rGO nanosheets . The as-prepared mesoporous NH/rGO composite exhibited high capacitance performance with a specific capacitance of 2558 F g −1 at the current density of 1 A g −1 , and presented good rate capability with still held 75.3% capacity at 30 A g −1 . Moreover, we used the NH/rGO as the positive electrode and the rGO aerogel as the negative electrode to assemble an asymmetric supercapacitor (ASC) device. This ACS device showed excellent specific energy of 166.97 Wh kg −1 at the power density of 0.38 kW kg −1 , and it still retains the specific energy of 100.91 Wh kg −1 under the higher specific power of 7.76 kW kg −1 . And it also displayed high rate performance and cycling durability with keeps 72% of the initial capacity after 3000 cycles (at 3 A g −1 ).
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Linan Wang,Shuxian Zhuang,Liu Wang,Na Wang,Hengliang Mo,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
Co(OH) 2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH) 2 Nfs/Ni f ) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH) 2 Nfs/Ni f composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH) 2 Nfs/Ni f composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH) 2 Nfs/Ni f electrode shows not only an extremely high sensitivity of 42.7 mA mM −1 cm −2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH) 2 Nfs/Ni f also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH) 2 Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH) 2 Nfs/Ni f electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH) 2 Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
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高影响因子
Environmental Chemistry
·
2018
·Vol. 15
·期 7
·411-423
·
IF 2.923
Shuyan Wang,Lin Du,Narcisse T. Tsona,Wenxing Wang
Environmental context Acetate esters, emitted into the atmosphere from both natural and anthropogenic sources, can participate in photochemical processes leading to the formation of secondary organic aerosols. We report a study on the kinetics and mechanisms of the reaction of two acetate esters with O3, OH, NO3, and Cl radicals. The results help our understanding of the chemical behaviour of this important class of compounds in the atmosphere. The photodegradation reactions of isopropenyl acetate (IPA) and 2-methyl-2-propenyl acetate (MPA) initiated by O3, OH, Cl and NO3 radicals have been investigated in a 100 L Teflon reactor at 293 ± 3 K, by using gas chromatography with flame-ionisation detection as well as thermal desorption–gas chromatography–mass spectrometry to monitor the reactants and the products. The rate constants for the reactions of IPA and MPA with the four atmospheric oxidants were determined by using either absolute or relative rate methods. The following rate constants (in units of cm3 molecule−1 s−1) were obtained: k(O3 + IPA) = (0.37 ± 0.06) × 10−18, k(OH + IPA) = (6.44 ± 0.74) × 10−11, k(Cl+ IPA) = (4.33 ± 0.52) × 10−10, k(NO3 + IPA) = (1.62 ± 0.22) × 10−14, k(O3 + MPA) = (2.76 ± 0.40) × 10−18, k(OH + MPA) = (7.41 ± 0.92) × 10−11, k(Cl + MPA) = (3.33 ± 0.39) × 10−10, k(NO3 + MPA) = (1.34 ± 0.23) × 10−14. With the exception of the kinetic study of the reactions of O3 and OH with IPA and the mechanistic study of the reaction of IPA with O3, the current research reports the first kinetic and mechanistic investigation for these reactions at atmospheric pressure. Acetic anhydride and 1-acetoxyacetone are the main products of the reactions of IPA and MPA, respectively. On the basis of the products and estimated tropospheric lifetimes of the two esters, reaction mechanisms are proposed and the atmospheric implications are discussed.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
·
IF 5.018
Qiangqiang Xiao,Wenhui Yuan,Li Li,Tao Xu
Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH) 2 ·8H 2 O/MEG composite PCM was synthesized by incorporating Ba(OH) 2 ·8H 2 O into MEG matrix. Mass fractions of Ba(OH) 2 ·8H 2 O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH) 2 ·8H 2 O. The phase separation of Ba(OH) 2 ·8H 2 O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH) 2 ·8H 2 O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH) 2 ·8H 2 O. The latent heat was approximately equal to the product of the latent heat of Ba(OH) 2 ·8H 2 O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15487-15499
·
IF 2.993
Yang Ming,Rao Richuan
In this work, nonmetallic S was doped into hierarchical Ni(OH) 2 hollow microspheres by ethanol solvothermal method using thiourea as sulfur source. Although the morphology of precursor Ni(OH) 2 is maintained, the surface states and pore properties had greatly changed after S doping. Using the as-prepared S-doped Ni(OH) 2 as adsorbents for the removal of Congo red (CR), the S-doped Ni(OH) 2 exhibited much better adsorption capacity compared with undoped Ni(OH) 2 . The adsorption behavior of both Ni(OH) 2 and S-doped Ni(OH) 2 followed the pseudo-second-order kinetic model and intraparticle diffusion model. The equilibrium data of Ni(OH) 2 could be better fitted by Langmuir model, while Freundlich model could be better used to describe the S-doped Ni(OH) 2 with a much larger adsorption capacity toward CR. The tuned microstructure and changed surface states of adsorbent after S doping may be responsible for the enhanced adsorption performance. Therefore, the doping of S species into hierarchical Ni(OH) 2 paves a new way to tune the microstructure and surface states of Ni-based materials.
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高影响因子
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