Table of Content

10 February 2025, Volume 46 Issue 2

Previous Issue   

Content

Cover and Content of Chemical Journal of Chinese Universities Vol.46 No.2(2025)

2025, 46(2):  1-6. 

Asbtract ( )   PDF (11989KB) ( )  

Related Articles | Metrics

Review

Internal Standard Method-based Surface-enhanced Raman Spectroscopy for Quantitative Analysis

BI Yingna, LIU Dingbin

2025, 46(2):  20240457.  doi:10.7503/cjcu20240457

Asbtract ( )   HTML ( )   PDF (13761KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Surface-enhanced Raman spectroscopy（SERS） is a spectral detection method that has been widely used in the fields of disease diagnosis， drug screening， and biological analysis， etc. It can not only provide rich chemical fingerprint information but also has the advantages of high sensitivity， resistance to photobleaching， and photodegradation. However， due to the poor uniformity of its enhancement matrix structure and the uncertainty of the number of chemical molecules adsorbed， the reproducibility of SERS detection results is poor， which makes it face many challenges in quantitative analysis. The deployment of internal standards could eliminate the external interference factors， thus achieving accurate quantitative analysis. We set out this review with a description of the mechanism of internal-standard methods， followed by introducing their main types. Thereafter， we introduced explanations of the applications of internal-standard probes in environmental analysis， food and drug analysis， and biological analysis. We conclude with an outlook of challenges and future development directions of internal-standard SERS.



Research Progress on Eutectic Gallium-indium and Self-assembled Monolayer-based Functional Molecular Junctions

CHEN Xiaoping, HUANG Shi, GUO Qianqian, LIU Ning, NI Jiancong, YANG Weiqiang, LIN Zhenyu

2025, 46(2):  20240451.  doi:10.7503/cjcu20240451

Asbtract ( )   HTML ( )   PDF (14619KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Functional molecular electronics based on eutectic gallium⁃indium as top electrode and self-assembled monolayer（SAM） as active layer is one of the research hotspots in recent years. Domestically， the study on EGaIn-based functional molecular junctions（MJ） is still in the beginning state. This review introduces the advantages of EGaIn as top electrode and the fabrication of SAM-MJ in detail， and shows recent workers on rectifiers， memory， opto-electrical switches， thermoelectrics， and solid-state impedance and so on. We analyze the challenges of EGaIn-based molecular junctions and propose the future development directions.



Article: Inorganic Chemistry

Synthesis and Temperature Control Performance of Silica Gel Waste Composite Phase Change Materials

XIE Zhuoxue, KOU Yan, SHI Quan, TIAN Ying

2025, 46(2):  20240372.  doi:10.7503/cjcu20240372

Asbtract ( )   HTML ( )   PDF (6908KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

In this study， silica gel waste（SGW） was utilized to prepare porous silicon dioxide（PSD） as a carrier， combined with capric acid-hexadecyl alcohol（DA-HD） as the base phase change material（PCM）， to develop the composite PCM capric acid-hexadecyl alcohol/porous silicon dioxide（PSD-DA-HD）. Expanded graphite（EG） was introduced to enhance the thermal conductivity of the material. The thermal performance of the composite PCM was evaluated using differential scanning calorimetry（DSC）， thermogravimetric analysis（TGA）， and thermal constant analysis. The composite PCM was then blended with cement mortar to form phase change mortar， and its temperature regulation capability was studied in simulated application experiments. The results indicate that DA-HD is physically encapsulated within the pores of PSD， achieving a loading capacity of 61.7%， with an enthalpy value of 105.6 J/g. The PSD-DA-HD composite PCM demonstrates good shape stability. The introduction of expanded graphite increased the thermal conductivity of the PSD/EG-DA-HD composite PCM to 0.9513 W·m^‒1·K^‒1 but reduced its loading capacity to 49.5%， with an enthalpy value of 88.1 J/g. Both PSD-DA-HD and PSD/EG-DA-HD exhibit a maximum working temperature of 92.2 ℃， ensuring thermal stability below this threshold. When PSD-DA-HD and PSD/EG-DA-HD were mixed with cement mortar， the resulting phase change mortars displayed excellent heat storage and temperature regulation properties. The phase change mortars C-PSD-DA-HD and C-PSD/EG-DA-HD maintained stable temperatures for 12.7 and 6.7 min， respectively， within the temperature range of 18—32 ℃. In the simulation experiments， the phase change mortar containing PSD-DA-HD extended the temperature regulation duration by 267.92% compared to the control group without PCMs in the same temperature range.



Synthesis of Aerosol-like Amphiphilic ZSM-5 Zeolite

XIAO Peiwen, YANG Aili, LIU Bolun, HAN Xue, LI Hui, YE Yinzhu, WANG Runwei, ZHANG Zongtao

2025, 46(2):  20240261.  doi:10.7503/cjcu20240261

Asbtract ( )   HTML ( )   PDF (7512KB) ( )  

Figures and Tables | References | Related Articles | Metrics

By asymmetric modification of ZSM-5 zeolite with 3-aminopropyltriethoxysilane and phenyltrimethoxy- silane， amphiphilic ZSM-5 zeolite with hydrophilic outer surface and oil-philic inner surface was prepared. The as-prepared zeolite was used as a precursor and processed by a gas-phase amphiphilic generator to obtain an aerosol-like zeolite with amphiphilic properties. The materials were characterized by means of SEM， XRD， FTIR and N₂ adsorption. The hydrophilic-lyophilic balance（HLB） of materials was measured and calculated. The effects of different concentrations of precursor and carrier gas flow on the size and quantity of aerosol-like amphiphilic zeolite were investigated.



Analytical Chemistry

Understanding the Water Structures in Antifreezing of DMSO Derivatives by Near-infrared Spectroscopy

LIANG Fanfan, HAN Li, CAI Wensheng, SHAO Xueguang

2025, 46(2):  20240424.  doi:10.7503/cjcu20240424

Asbtract ( )   HTML ( )   PDF (2098KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The molecular mechanism of L-methionine sulfoxide［L-Met（O）-OH］， a derivative of dimethyl sulfoxide （DMSO）， in inhibiting ice crystal growth was studied using near-infrared spectroscopy combined with chemometrics. High-resolution spectra were obtained through wavelet packet transform， allowing for a detailed analysis of the NIR spectra of L-Met（O）-OH solutions at various concentrations during the freezing process at -5 ℃. Spectral information regarding the interaction between the S=O group and ice was extracted. The results indicate that the primary reason for the effective inhibition of ice growth by L-Met（O）-OH is the formation of hydrogen bonds between the S=O group and ice. Further analysis of solutions at 0 ℃ revealed spectral features of interactions between water molecules and the S=O and C=O groups in L-Met（O）-OH. During the freezing process， the intensity of the spectral peaks associated with these interactions gradually decreased， indicating that the interactions between the S=O and C=O groups and water molecules weakened， and this weakening effect became more pronounced at higher concentrations. Finally， the role of the NH group in the inhibition of ice crystal growth was investigated. It was found that during freezing， the binding of NH groups to water molecules increased， forming a stable hydrogen-bonded network. The result indicates that the NH group consistently interacts with water throughout the freezing process and does not significantly interact with ice.



Alkanethiol Self-assembly Behavior on Gold Nanoparticles Based on Single-nanoparticle Collision Electrochemistry

BAI Yiyan, WANG Chenyang, GAO Yang, LI Jiamin, YANG Haiying

2025, 46(2):  20240402.  doi:10.7503/cjcu20240402

Asbtract ( )   HTML ( )   PDF (2505KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The self-assembly kinetics of alkanethiol on the surface of gold nanoparticles（Au NPs） was investigated by detecting dispersed individual particles in the solution based on single-nanoparticle collision electrochemistry， as well as the effects of reaction temperature， alkanethiol concentration， and molecular structure on their assembly behavior during the assembly process. The results showed that the formation of self-assembled monolayers of alkanethiol reduced the active area of Au NPs， leading to a decreased current intensity for catalyzing hydrogen evolution. Based on this， comparing the current transients of different self-assembly conditions， it was found that the increase of adsorption amount was correlated positively with the concentration of alkanethiol and the reaction temperature within limits. Controlling the reaction time to 10 min， when the concentration of 6-mercapto-1-hexanol （6-MCH） was 73 mmol/L and the reaction temperature is 45 ℃， 6-MCH adsorbed the most amount on Au NPs. Furthermore， by comparing the self-assembly kinetics curves of 6-MCH， 3-mercapto-1-propanol（3-MCP）， and 3-mercaptopropionic acid（3-MPA）， it was found that the self-assembly process consisted of diffusion controlled rapid adsorption and slow recombination. Due to the strong electrostatic repulsion between the functional head group （carboxylate） of 3-MPA and the citric acid ligand of Au NPs， the adsorption capacity of 3-MPA was significantly lower than that of the other two molecules. The maximum adsorption capacity of 3-MCP and 6-MCH was basically the same， but due to the longer alkyl chain of 6-MCH， its adsorption free energy change was about 4.0 kJ/mol higher than that of 3-MCP， and it eventually reached the maximum adsorption value later.



Construction and Imaging of NO Fluorescence Probe Based on Zinc Complex

CHEN Yiliu, ZONG Hongfeng, DUAN Zhaolong, ZHANG Yipeng, GAO Yan, LI Chao, LIU Yang, GAO Yun

2025, 46(2):  20240370.  doi:10.7503/cjcu20240370

Asbtract ( )   HTML ( )   PDF (4953KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

A fluorescent probe CMD-Zn²⁺ based on zinc complexes was constructed for NO detection， Ligand CMD was prepared by naphthalene and furanide and ligonidaldehyde by condensation reaction. The ligand CMD was combined with zinc ions to form the probe CMD-Zn²⁺. The probe CMD-Zn²⁺ could specifically recognize NO. The recognition performance of probe CMD-Zn²⁺ was examined by fluorescence spectroscopy and UV absorption spectroscopy， and the structure of CMD was characterized by high-resolution mass spectroscopy（HRMS） and nuclear magnetic resonance hydrogen spectroscopy（¹H NMR）. The experimental results showed that in the presence of other competing ions， the probe CMD-Zn²⁺ specifically recognized NO， and the detection limit of NO recognition was 8.23×10^‒9 mol/L. The probe CMD-Zn²⁺ has been successfully applied in fluorescence imaging studies in cells and live mice.



Chiral Gold Nanoprobes for Colorimetric Detection of the Drug Enantiomers

TAN Xiaoping, WU Hongwei, WANG Dandan, ZHANG Jin, ZHANG Junhui

2025, 46(2):  20240352.  doi:10.7503/cjcu20240352

Asbtract ( )   HTML ( )   PDF (6819KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Based on the good optoelectronic properties of gold nanoparticles and the good RGB sensing performance of mobile intelligent devices， a chiral colorimetric detection method for the rapid detection of R/S-phenylalamine and R/S-ibuprofen enantiomer molecules was designed. Chiral gold nanoparticles exhibit non-covalent interactions， such as electrostatic， hydrogen bonding， and hydrophilic（hydrophobic） interactions， which cause energy resonance transfer on the surface of nanomaterials， resulting in their stabilization and aggregation， and then show different colors， and finally achieving the purpose of colorimetric detection. The addition of copper ions（Cu²⁺） during the detection process can enhance chiral recognition because Cu²⁺ can form complexes with enantiomer molecules and chiral gold nanoparticles at the same time. In addition， the sensitive RGB detection performance of mobile intelligent devices was used to quantitatively detect the enantiomer molecules of R/S-phenylalamine and R/S-ibuprofen， and the detection limits were 124.35 and 104.58 μmol/L， 123.95 and 111.44 μmol/L， respectively. At the same time， the method can realize the detection of enantiomeric mixtures within a certain concentration range. In this work， chiral gold nanoparticles were used as colorimetric probes and mobile intelligent devices were used as detection devices to construct a fast and convenient detection method， which has potential application value in the detection of enantiomer molecules.



Organic Chemistry

Influence of Polycyclic Aromatic Hydrocarbon Molecular Framework on Single-molecule Conductance

WANG Mingzhen, WANG Zhiye, LI Mengxiao, LU Yuhua, WANG Xu, LI Yunchuan

2025, 46(2):  20240429.  doi:10.7503/cjcu20240429

Asbtract ( )   HTML ( )   PDF (4103KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

The charge transport process within molecular junctions is influenced by many factors， including the molecular backbones and anchoring groups. In this paper， to investigate the impact of the molecular backbone on the charge transport properties of molecular junctions， we designed and synthesized three kinds of polycyclic aromatic hydrocarbons（PAHs） with different fused-ring core（benzene， naphthalene and anthracene） as molecular skeleton and thiophene as anchor group. Scanning tunneling microscope break junction（STM-BJ） measurement and density functional theory（DFT） -based calculations were performed to investigate the charge transport process of single PAHs junctions. The STM experimental results of three molecules exhibit two distinct conductivity states， designated as high conductance states（G_H） and low conductance states（G_L）， which correspond to the two binding configurations of Au-π and Au-S within single molecular junctions for three molecules. In the case of the G_L state， the increase of fused-ring core effectively shifts the HOMO level closer to the Au Fermi level， resulting in a conductance trend of G_DT-A>G_DT-N>G_DT-B. In the G_H state， the conductance value of three molecular junctions will not change obviously with the increase of π-conjugated area， but the increase in twist angle of PAHs results in an enhancement of steric hindrance， which reduces the probability of Au-π bonding configuration， ultimately leading to a change in the formation ratio of the two molecular configurations of Au-π and Au-S.



Synthesis of COF-LZU1 in Acetate Buffer and Immobilized Enzyme Study

LIU Meng, XU Yi, YANG Fan, ZHOU Quan, REN Jing, REN Ruipeng, LYU Yongkang

2025, 46(2):  20240368.  doi:10.7503/cjcu20240368

Asbtract ( )   HTML ( )   PDF (2218KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

COF-LZU1 was synthesized in acetate buffer at room temperature and used to immobilize laccase and horseradish peroxidase. Firstly， by optimizing the reaction conditions such as reaction concentration， reaction time， pH value of the acetate buffer， reaction temperature， washing solvent and drying method. In acetate buffer， COF-LZU1 was synthesized with high crystallinity at pH=4.5 with stirring at room temperature for 30 min， which has high specific surface area up to 501 m²/g， and higher thermal stability（480 ℃）. Then， under the aforementioned optimal reaction conditions， laccase and horseradish peroxidase were immobilized by in situ embedding with COF-LZU1 as a carrier， and their properties were investigated， which showed that the enzyme activities after immobilization were as high as 84.26% and 73.66%（with respect to the free enzyme activity）， and the relative activities were still maintained at about 80% after cycling for 10 times of use. Through multiple binding sites， COF-LZU1 effectively stabilized the active conformation of the enzyme， which made it less prone to structural deformation and improved the thermal stability， pH stability and reusability of the enzyme， etc. Acetate buffer is a commonly used buffer in biochemical experiments， which was used as both a solvent and a catalyst in the present experiments. Compared with the existing synthetic methods， the method has a better effect on the stability of biomolecules and is expected to provide a new solution for enzyme immobilization.



Synthesis of Difluoromethyl Pyrazoles by ［3+2］ Cycloaddition Reaction of Difluoroacetohydrazonoyl Bromides with Vinyl Sulfonefones

LIU Xiaokang, ZHOU Yuxiu, LI Xiaoyong, LUO Wenjing, WANG Kehu, WANG Junjiao, HUANG Danfeng, HU Yulai

2025, 46(2):  20240302.  doi:10.7503/cjcu20240302

Asbtract ( )   HTML ( )   PDF (1846KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

A series of 3-difluoromethyl pyrazole compounds was synthesized via a ［3+2］ cycloaddition reaction of difluoroacetohydrazonoyl bromides with vinyl sulfones. The method has the advantages of high regioselectivity， mild reaction conditions and simple operation， providing a new method for the synthesis of 3-difluoromethyl pyrazole compounds. Meanwhile， it further extends the application of difluoroacetohydrazonoyl bromides as difluoromethyl building blocks in synthesis of difluoromethyl N-heterocycle compounds.



Physical Chemistry

Preparation of MO _δ /3DOM ZSM-5 Catalysts and Their Catalytic Performance for the Simultaneous Removal of Soot and NO_x

WANG Lanyi, WANG Shiwei, CHEN Xinyu, YU Di, ZHANG Chunlei, FAN Xiaoqiang, YU Xuehua, ZHAO Zhen

2025, 46(2):  20240455.  doi:10.7503/cjcu20240455

Asbtract ( )   HTML ( )   PDF (7561KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Soot particles and NO_x， as the main pollutants in diesel engine exhaust， have caused a serious threat to people's health and the surrounding environment. Therefore， the catalytic purification of soot and NO_x is of wide concern. In this work， the three-dimensionally ordered macroporous（3DOM） ZSM-5 zeolite catalyst with unique pore structures was prepared and taken as a carrier. The 3DOM ZSM-5 supported MO_δ（M=Mn， Fe， Co， Ce， Pr， W） catalysts were also prepared. The prepared catalysts have a unique hierarchical pore structure， which is conducive to the capture and mass transfer of soot and small molecules such as NO_x， thereby enhancing the catalytic performance of the catalysts. Among the prepared catalysts， MnO_δ/3DOM ZSM-5 catalyst exhibits the best catalytic performance for the simultaneous removal of soot and NO_x， and its peak temperature for soot combustion is the lowest（453 ℃）， the initial temperature for NO conversion above 80% is the lowest（184 ℃） and the temperature window（184—362 ℃） over 80% NO conversion is wider. The excellent catalytic performance of MnO_δ/3DOM ZSM-5 is related to the good redox ability， abundant acid sites， sufficient reactive oxygen species， and rich hierarchical pore structures. Meanwhile， MnO_δ/3DOM ZSM-5 catalyst also has the highest intrinsic activity according to the kinetic test results. In addition， based on the results of the activity test and in situ diffuse reflectance infrared spectroscopy（in situ DRIFTS）， the reaction mechanisms of the catalyst at different temperatures were proposed. At low temperatures （<300 ℃）， the reaction mainly belongs to denitrification， following the Eley-Rideal（E-R） mechanism. Soot combustion mainly occurs at high temperatures（>300 ℃）， including activated oxygen mechanism and NO₂ assisted mechanism.



First-principles Study on the Catalysis of OER/ORR by N-doped Graphene with Defects

HUANG Zhiyao, LI Li, XU Huaqing, YANG Yifan, WEI Yaoyao, LIU Guokui, XIA Qiying

2025, 46(2):  20240430.  doi:10.7503/cjcu20240430

Asbtract ( )   HTML ( )   PDF (2927KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

Non-metallic doped graphene-based catalysts have good application prospects in catalyzing oxygen evolution reaction（OER） and oxygen reduction reaction（ORR）. Based on the common double vacancy defects of graphene， non-metallic N-doped catalytic material was constructed and all possible active sites were studied. Through DFT calculation， we find that none of the 13 carbon active sites can effectively adsorb H₂O， while O₂ can be effectively adsorbed. The calculation results show that the optimal catalytic site for ORR is C12， with the overpotential of 0.71 V for catalyzing ORR， followed by the C10 site adjacent to pyridine N and C3 site， with the overpotentials of 0.75 V and 0.78 V， respectively. This study demonstrates that non-metallic N-doped defective graphene materials can be applied to catalyze ORR， providing theoretical support and guidance for non-metallic catalysis in the OER/ORR reactions.



K⁺ Regulation of MER Zeolite and Its Effect on O₂ and N₂ Adsorption Kinetics

BAI Xiaowei, TANG Xuan, WANG Yating, ZHANG Feifei, LI Jinping, YANG Jiangfeng

2025, 46(2):  20240411.  doi:10.7503/cjcu20240411

Asbtract ( )   HTML ( )   PDF (4664KB) ( )  

Figures and Tables | References | Related Articles | Metrics

By varying the amount of mineralizer added during feedstock preparation， the microporous structure of the material was precisely controlled， leading to a differentiation in the adsorption kinetics of O₂ and N₂ within the zeolite pore channels. The experimetal results indicate that as the K/Si molar ratio increases， the pore structure of the material contracts， and porosity gradually decreases. Notably， the O₂/N₂ kinetic selectivity of K-MER-0.41 ［n（K）/n（Si）=0.41］ reaches its highest value（3.24） at 298 K. Molecular dynamics simulations further suggest that the diffusion rate of O₂ on K-MER-0.41 is also greater than that of N₂.



First Principles Study of Tunable Electronic and Optical Properties of GaP/SiH van der Waals Heterostructure

GUO Xin, MA Yongqiang, BAO Aida, DENG Rui, QIN Li, ZHANG Wenqi, XU Houdun

2025, 46(2):  20240410.  doi:10.7503/cjcu20240410

Asbtract ( )   HTML ( )   PDF (3896KB) ( )  

Figures and Tables | References | Related Articles | Metrics

In this study， a type-II GaP/SiH heterostructure was predicted and constructed， with an in-depth investigation into its structural， electronic and optical properties. The research revealed that the GaP/SiH heterostructure was a typical van der Waals heterostructure， exhibiting excellent energy and thermodynamic stability. It had a bandgap of 2.24 eV， and the arrangement of the type-II band structure effectively suppressed the recombination of photogenerated charge carriers. Furthermore， it was found that the electronic structure of the heterojunction can be precisely modulated within a certain range by applying different biaxial and uniaxial strains. The GaP/SiH heterostructure also demonstrated excellent light absorption performance in the visible and ultraviolet regions， with an absorption coefficient reaching up to 2.34×10⁶ cm^-1. The outstanding performance exhibited by the GaP/SiH heterostructure provides a reference for the design of optoelectronic devices.



First-principles Study of Doping and Point Defects Modulating the Photodissociative Water Properties of MoS₂/ZnO Heterojunction

WEN Junqing, WANG Jiahui, ZHANG Jianmin

2025, 46(2):  20240380.  doi:10.7503/cjcu20240380

Asbtract ( )   HTML ( )   PDF (17502KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The electronic structures， optical properties and photocatalytic performance of MoS₂/ZnO heterojunction doping with C and Pd elements and point defects were studied using first principles calculations. The stable sites of C and Pd atom doping MoS₂/ZnO heterojunction is S2 and Zn site， and the stable defect point is Zn defect. The analysis of electronic structures shows that band edge position of the intrinsic MoS₂/ZnO presents a type II band alignments with a direct band gap of 0.66 eV. Doping and defects can effectively regulate the band gap of MoS₂/ZnO. Pd@Zn system exhibits magnetic semiconductor， V_Mo and V_Zn systems exhibit magnetic metallic properties. Doping and defects increase the light absorption coefficient of MoS₂/ZnO heterojunction in the visible light range（500—760 nm）. Intrinsically， there is a built-in electric field from ZnO layer to MoS₂ layer at the interface in the doping and defective MoS₂/ZnO， which promotes charge transfer from ZnO layer to MoS₂ layer. The charge transfer amount of Pd@Zn， C@S2&Pd@Zn increases. The intrinsic MoS₂/ZnO， C@S2， Pd@Zn， V_S1， V_S2 and V_O systems form direct Z-type heterojunctions， which promote the effective separation of photo generated electron hole pairs. The band edge potential of MoS₂/ZnO， C@S2， Pd@Zn， V_S1， V_S2 and V_O crosses the oxidation-reduction potential at pH=0 and 7， indicating that these heterojunctions can undergo oxidation-reduction reactions under strong acid solution and neutral solution conditions， and the carriers have strong oxidation-reduction ability.



Polymer Chemistry

ZIF-8 Nanosheet-functionalized Poly（lactic acid） Nanofibrous Membranes for Efficient Filtration of Ultrafine Particles

WANG Shengcheng, WANG Cunmin, HAO Yaxin, ZHU Guiying, LI Xinyu, SONG Xinyi, ZHANG Mingming, XU Huan, HE Xinjian

2025, 46(2):  20240426.  doi:10.7503/cjcu20240426

Asbtract ( )   HTML ( )   PDF (10193KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Zeolite imidazolate framework-8（ZIF-8） nanosheets（ZIF-8-NS） with high specific surface area were prepared by micro-assisted synthesis method， and uniformly dispersed into poly（lactic acid）（PLA） solution as nano-dielectrics， then ZIF-8-NS-functionalized PLA（PLA/ZIF-8-NS） nanofibers were prepared by electrospinning to improve the filtration efficiency and to achieve the long-lasting respiratory protection for the operators. The microstructure and properties of the prepared PLA/ZIF-8-NS nanofibrous membranes were investigated. It was found that the addition of ZIF-8-NS resulted in a significant refinement of PLA/ZIF-8-NS fibers（253 nm） and an increase in fiber surface roughness. The surface potential of PLA/ZIF-8-NS nanofibrous membrane reached 10.4 kV and the dielectric constant reached 2.71， demonstrating excellent charge storage capability. At the same time， the PLA/ZIF-8-NS nanofibrous membrane was given excellent filtration performance for ultrafine particles， and the filtration efficiency for PM_0.3 and PM_0.3—2.5 reached 95.57% and 99.95% respectively under the high air flow rate of 85 L/min， with an air resistance of 305.3 Pa， and the filtration efficiency for PM_0.3 still maintained at a high level of 98.50% after 360 min of filtration. In addition， the PLA/ZIF-8-NS nanofibrous membrane exhibited superior antimicrobial properties， with an inhibition rate of 99.9% against Staphylococcus aureus. These results indicate that PLA/ZIF-8-NS nanofibrous membranes have great potential to achieve long-term filtration and low resistance to ultrafine particles， which can provide an important safeguard for respiratory health protection of personnel operating in high dust concentration environment.