International Journal of Environmental Science and Technology
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2024
·
IF 3
Feng Qian,Liu Jia,Liu Zhigang,Zhou Yuhong,Zhou Yuze,Dong Zhihui,Tang Dongyan
Wastewater containing organic pollutants has created serious environmental issues and severely threatened human health due to the industry’s rapid development. Fenton processes, among the most economical advanced oxidation methods, can efficiently decompose and completely mineralize organic pollutants. Fenton processes have been widely employed in wastewater treatment to remove organic dyes; however, their practical application is limited due to the secondary pollution of Fe sludge. This work used the electrospinning technique to create Fe-alginate/PVDF nanofibers with a mass ration of 1:0.3, followed by iron ion exchange (0.08 wt%) as a photo-Fenton catalyst. The catalytic degradation of 20 mg/L methylene blue revealed that Fe-alginate/PVDF nanofibers (10 mg) had remarkable photo-Fenton catalytic performance, degrading 97.24% of methylene blue within 40 min under optimized conditions (pH of 3, H 2 O 2 concentration of 0.20 mM). Additionally, the wetting property and the development of the Fe-alginate coordination structure prevented iron leaching and strengthened the Fe-alginate/PVDF nanofibers’ structure stability, thus limiting secondary pollution of wastewater during application. Moreover, Fe-alginate/PVDF nanofibers could effectively remove MB over a wide pH range of 3.0–9.0, applied to the majority industrial wastewater (neutral or slightly acidic pH conditions). This work provides a facile strategy to prepare stable and cost-effective heterogeneous photo-Fenton catalysts, demonstrating potential applications in industrial-scale wastewater treatment.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zihan Tian,Yumei Xu,Qingyu Liu,Xiao Wu,Shuhao Qin,Jing Zhang,Hong Wang,Jianxin Li,Zhenyu Cui
The ridge-like PVDF/CQDs-TiO 2 @CQDs hybrid piezo-photocatalytic film was fabricated via an " in situ hydrothermal-vapor induction" method, in which the S-scheme TiO 2 @CQDs heterostructures were grown in situ and uniformly immobilization onto the polyvinylidene fluoride (PVDF) film surface through Ti-F coordination bonds. The effects of hybrid film morphology, carbon quantum dots (CQDs) doping, and flow rate on piezo-photocatalytic degradation performance were investigated. The ridge-like microstructure increased the exposure of adsorption and catalytic active sites. The film reactor driven by the flow of dye solution and light illumination promoted the adsorption of pollutants while establishing a dual built-in electric field (IEF) between the piezoelectric PVDF and catalysts, TiO 2 and CQDs, which accelerated photogenerated charge transfer and separation. Finally, a dynamic piezo-photocatalytic process was realized for the efficient and synergistic degradation of RhB. The reaction rate constant ( ks ) of the dynamic piezo-photocatalytic degradation was about 2.3 times that of the static photocatalytic process. Structural optimization and density functional theory (DFT) calculations of Rhodamine B (RhB) molecules were performed using Gaussian software. The degradation products, degradation pathways, and degradation mechanisms of RhB were thoroughly studied by combining the results of total organic carbon (TOC), DFT and liquid chromatography mass spectrometry (LC-MS).
研究领域:
材料科学
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环境科学
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光催化技术
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 9
·5049-5056
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IF 1.938
Wang Yihe,Qin Faxiang
Lithium (Li) metal has been considered as a potential substitute for the graphite anode in Li-ion batteries to further boost their energy density. Polymer electrolytes (PEs) are expected to be applied in Li metal batteries (LMB) to replace liquid electrolytes due to safety concerns. Among others, poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP)-based electrolytes offer clear advantages such as improved processability and chemical/electrochemical stability. However, Li dendrite growth in LMBs and the low Li-ion conductivity of solid polymer electrolytes (SPEs) still hinder their practical applications. To address this issue, it has been proposed that solvent-enhanced PVDF-HFP-based polymer electrolytes (SPPEs) with a tuned amount of residual N -methyl-2-pyrrolidone (NMP) could provide improved ionic conductivity and outstanding chemical/electrochemical stability. We report herein the effects of different salts, polymer, and additives on the electrochemical performance and interface stability of SPPEs. We demonstrate that lithium salts and blended polymers play a pivotal role in the electrochemical performance of SPPEs. In addition, additives exert a remarkable effect on the stripping/plating behaviors of metallic lithium anode in SPPEs. SPPEs with adequate LiNO 3 are found to be stable with lower overpotentials at 0.5 mA cm −2 on cycling of symmetrical Li cells. These results highlight novel SPPE strategies for optimizing the ionic conductivity and stabilizing the lithium metal anodes.
研究领域:
材料科学
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电化学
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能源存储
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电池技术
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DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 49
·36656-36666
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IF 3.9
Junxia Mao,Xinyu Tan,Weiwei Hu,Chao Shi,Fan Zhou,Alkiviadis Tsamis
Daytime radiative cooling is a technique that relies on reflecting sunlight and radiating heat through mid-infrared wavelengths to cool objects. However, most daytime radiative cooling materials are not transparent, cannot be used for vehicle windows or other objects that need to retain their original color, and are susceptible to rain, dust, and other contamination, resulting in reduced cooling performance. Here, we developed a transparent, self-cleaning, radiative cooling, highly flexible PVDF composite film (PPF film), which was prepared by solvent evaporation phase conversion method and scraping coating method. The preparation method is simple and the material is easy to obtain. The obtained PPF film can be crimped to different degrees, has high flexibility, a transmittance of 94% in the visible light range (380–760 nm), and a water contact angle of 105° and above, and has self-cleaning performance. In the range of 8–13 μm, the average emissivity of the film reached 94.42%. Outdoor experiments show that, on sunny days, the cavity temperature of the device coated with PPF film glass decreases by 5–6 °C compared with that of bare glass, indicating that the PPF film has excellent radiative cooling performance. In addition, it has relatively strong mechanical properties, ultraviolet aging resistance and acid and alkali resistance. The design of the PPF film enables the radiative cooling material to be transparent, self-cleaning and flexible, with broad application prospects in the outer surface of objects requiring light transmission and cooling, such as special-shaped curved surfaces, solar panels, and architectural glass.
研究领域:
材料科学
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化学工程
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环境科学
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物理学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yang Yu,Ying Xue,Jingxuan Zhao,Ke Ning,Shulin Sun
The global water pollution problem is increasingly severe, and the wastewater separation technology has received high attention. Polyvinylidene fluoride (PVDF) fiber membranes have a great potential in wastewater treatment. However, its large pore size and high porosity lead to low retention rate and high contamination, which make it impossible to reuse. In this study, it was assumed that the modified nanoparticles CNTs-COOH@TA were prepared by modifying CNTs with tannic acid (TA) through π-π conjugation, and were used as the support layer of the PVDF matrix by electrostatic spinning. The chitosan hydrogel was tightly bound to the PVDF-CNTs-COOH@TA nanofiber support through hydrogen bonding and electrostatic interaction to confer the strong hydrophilicity on the surface of the composite fiber membranes, and the composite PVDF-CNTs-COOH@TA-CS membranes should have excellent performance in PVDF water treatment. The PVDF-CNTs-COOH@TA-CS composite fiber membrane should have high hydrophilicity, high retention rate and reusability. Compared to other separation membranes, the composite membranes achieved effective separation of the oil-in-water emulsion and the dye wastewater while maintaining the rapid permeation of the aqueous phase. The pure water flux of the optimum CS3 composite membrane was 1907.8 Lm -2 h -1 bar -1 , which could completely separate oil-in-water emulsion and retain more than 90% of dyes. In addition, the flux recovery rate (FRR) of the CS3 composite membrane was still more than 86.8% after five cycles, and which had a good antifouling ability. The maximum tensile strength of CS3 increased by 279.7% over PVDF fiber membrane. This innovative approach based on synergistic modification of natural materials provides new ideas for the development of efficient and environmentally friendly wastewater treatment technologies.
研究领域:
环境科学
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材料科学
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污水处理技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaotong Mu,Lihua Chen,Nannan Qu,Min Yin,Shang Wu,Qimeige Hasi,Chaohu Xiao
Solar-powered interface evaporation is considered a promising technology to obtain freshwater from non-potable water by using sustainable solar energy. However, research on combining the photocatalytic effect with solar interfacial evaporation technology to go for photothermal conversion materials with full solar spectrum utilization for photothermal and photodegradation capabilities is still scarce. Due to the unique optical properties of MXene, a novel MXene/Ag 3 PO 4 -based membrane with synergistic photothermal and photocatalytic effects was developed from the perspective of practical applications such as water purification, photodegradation of organic dyes and antibacterial properties. In this paper, polyvinylidene fluoride (PVDF) and carbon black (CB) were used as the substrate, calcium carbonate (CaCO 3 ) and hydrochloric acid (HCl) were selected as the pore-forming agent for hydrophilic modification, and MXene/Ag 3 PO 4 serves as the photocatalyst. The prepared composite polyvinylidene fluoride membrane (PCC-MXene/Ag 3 PO 4 ) with Schottky junction, possesses a rich pore structure, abundant water molecule transport channels, high light absorption ability, and low thermal conductivity, which lead to a good performance in solar interface evaporation, photodegradation and antibacterial. The superhydrophobicity and floatability of the nanosponges in water enable them to continuously pump water, which greatly promotes the dissolution of salt accumulation. With the help of porous nanosponges, PCC-MXene/Ag 3 PO 4 exhibits excellent evaporation stability and salt resistance under 1 kW m −2 solar irradiation, as well as photodegradation of organic dyes. In addition, the PCC-MXene/Ag 3 PO 4 membrane has the properties of self-buoyancy, electrical conductivity, and superior flexibility. Therefore, considering the simple preparation method and fine performances, the PCC-MXene/Ag 3 PO 4 mixed membrane has great application potential in the study of interface evaporation, photodegradation of organic dyes, and antibacterial properties.
研究领域:
材料科学
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环境科学
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纳米技术
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水处理
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光催化
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
San-Ni Zhao,Zi-Li Zhang,Li-Juan Yin,Yan Wang,Yi-Le Zhu,Zhi-Min Dang,Yu Zhao
Dielectric elastomers (DEs) have been extensively studied for their excellent electromechanical conversion properties, which make them ideal for flexible and non-magnetic drives. However, the common DEs usually require a high actuating electric field to achieve outstanding performance, severely limiting their application. In this study, advanced DE composites with good mechanical and dielectric properties was designed and synthesized (named as CPBA/PVDF). Adding DMF to the precursor solution and removing it after polymerization can lower the crosslinking density and increase linear polymer plasticizers in the matrix. As a result, the Young's modulus reduces and elongation at break arises without deteriorating the hysteretic and relaxation properties. Moreover, the incorporation of polar PVDF notably increases the tensile strength and dielectric constant of the composite films. Based on these, the CPBA/PVDF-3 gets a relatively high dielectric constant (5.74@1 kHz) and low modulus (0.144 Mpa), remarkably improves its actuation sensitivity (39.86), which is three times higher than that of the CPBA matrix (11.44). Therefore, CPBA/PVDF-3 achieved a high actuating strain of 25.1 % under 17.17 kV/mm with non pre-strain, and 160 % at 36.3 kV/mm under 200 % biaxial pre-tension. Importantly, it demonstrated a specific power density of 235 W/kg at just 16 kV/mm (@ 6 Hz). In addition, a simple linear actuator based on the CPBA/PVDF film can produce a free displacement of 0.755 mm (7.55 % of the actuator's effective length) and an output force of 306.95 mN/g at 15.7 kV/mm.
研究领域:
材料科学
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聚合物复合材料
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机电系统
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柔性机器人
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智能材料
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Fangyan Ji,Peilin Wang,Zhenrun Li,Kaixiang Ji,Dongyu Wang,Qiang Ma
Aggregation-induced emission (AIE) has been widely used in research on electrochemiluminescence (ECL) due to its excellent luminescence intensity. In this work, copper superparticles (Cu SPs) were used to construct ECL biosensor to detect the microRNA-103a (miRNA-103a) in triple-negative breast cancer (TNBC) tumor tissues. Firstly, GSH-capped copper clusters were used as precursors to prepare Cu SPs by the AIE effect. Compared with clusters, Cu SPs possessed higher luminescence performance and energy stability, making them an ideal choice for ECL nanoprobe. The film of PVDF-HFP/CeVO 4 NPs was constructed and modified with CPBA and GSH as the sensing interface (PCCG). The PCCG film displayed good conductivity and hydrophilicity, and desirable mechanical stability. Moreover, the PCCG film can induce high carrier mobility rates and dissociate large amounts of the co-reactant K 2 S 2 O 8 to enhance the ECL intensity of Cu SPs. As a result, the prepared ECL sensor with the catalyzed hairpin assembly (CHA) strategy was employed to quantify miRNA-103a in the range of 100 fM to 100 nM. The biosensor provided a novel analytical approach for the clinical diagnosis of TNBC.
研究领域:
生物传感器
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癌症诊断
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纳米技术
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 9
·9503-9519
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IF 3.056
Xie Wanying,Li Ji,Sun Feiyun,Dong Wenyi
The influence of ultrasonication on membrane performance was investigated by two ultrasonication modes, direct and indirect ultrasonication as pretreatment, and simply improved PVDF-TiO 2 membranes’ performance was systematically compared. Ultrasound intensity of 100% and ultrasonication time ranged from 1 to 2 h positively affect membrane permeability. Characterization results manifested that membrane structure was eventually optimized with an even nano-TiO 2 dispersion by direct ultrasonication. Analysis of surface roughness reflected that PVDF-TiO 2 (MS-U2) surface morphological pattern was peak-valley structure that resisted fouling greatly. A good fitting of experimental result and Tansel’s simulation illustrated that anti-fouling ability was realized direct ultrasonication modified membrane. PVDF-TiO 2 (MS-U2) membrane showing the lowest | τ | reflecting the time required to reach a certain level of the fouling degree was the lowest. Relying upon modified Hermia’s model analysis, protein blockage within the membrane pore was one major fouling mechanism; surface blockage degree of PVDF-TiO 2 (MS-U2) was relative slight. Fouling mechanism analyzed by two models reflected that PVDF-TiO 2 (MS-U2) membrane exhibited a higher anti-protein fouling ability during cross-flow filtration process.
研究领域:
材料科学
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环境工程
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膜技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Li Zeng,Yuan Li,Qichao Li,Yiping Guo
Polyvinylidene fluoride (PVDF) has attracted extensive attention for flexible piezoelectric strain sensors due to its piezoelectric activity and mechanical robustness. However, practical application in small-strain monitoring occasions remains restricted by limitations such as low intrinsic piezoelectricity. Inspired by the mechanical structure of Venus flytrap's trigger hairs, this study synergistically combines modulus differentiation mechanisms with a coaxial architecture to develop core–shell nanofibers. The fiber structure comprises a rigid Polyamide 66 (PA66) core, a flexible PVDF sensing layer as the outer shell, and polydopamine-modified BaTiO3 nanoparticles (PBTO) distributed within the outer sheath. These bioinspired fibers feature a radial stiffness-flexibility combination to achieve directional stress transmission. The modified nanofiber membrane achieves an 840% enhancement in voltage output compared to pure PVDF, demonstrating bending sensitivity of Gauge Factor (GF) 221.4 and only 0.67% signal attenuation over 12 000 cyclic tests. Leveraging this amplification mechanism, the core–shell nanofibers have been engineered into bending vector sensors capable of discerning wind velocity magnitude and directional parameters. This approach shows potential for optimizing unmanned aerial vehicle flight trajectories to enhance operational efficiency.
研究领域:
材料科学
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纳米技术
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传感器
·
生物力学
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柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2023
·
IF 4.6
Ying Wei,Wei Chen,Xinyi Ge,Jiayi Liang,Zheng Xing,Qingguo Zhang,Zhong-Xia Wang
Ionogel electrolytes (IGEs) with chemical and thermal stability properties have attracted considerable attention for all-solid-state energy storage devices, particularly for high-performance supercapacitors (SCs). However, achieving high conductivity, flexibility, and toughness, as well as deformation and impact resistance in special cases, is challenging with the typical polymer based on ionic liquids (ILs). Here, an effective gelation strategy is proposed for the preparation of free-standing LiTFSI/[EMIM][TFSI]/PVDF-HFP ionogels (IGs) by double-additive induced physical cross-linking. The mechanical and electrochemical properties of the IGs can be synergistically optimized by the cross-linking and entanglement of LiTFSI and [EMIM][TFSI] with the PVDF-HFP network. The target IGs simultaneously exhibit excellent deformation capacity (over 50 %), high ionic conductivity (10.3 × 10 −3 S cm −1 at 25 °C), hardness (H: 728.6 kPa), and Young's modulus (E: 11.4 MPa), which can exhibit the specific capacitance of 274. 55 F g −1 , energy density of 38.13 Wh kg −1 and maximum power density of 2499.93 W kg −1 in the fabricated symmetric supercapacitor . The results will motivate us to further explore their applications for flexible electronic devices, wearable electronic skin, and flexible energy storage.
研究领域:
材料科学
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电化学
·
高分子物理
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能源存储
·
柔性电子学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Yue Zhang,Qingguo Chi,Lizhu Liu,Tiandong Zhang,Changhai Zhang,Qingguo Chen,Xuan Wang,Qingquan Lei
The dielectric polymer-based films with excellent energy storage properties have been considered as potential candidates for flexible capacitors. In this study, the hierarchical gradient structures of the 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 nanofibers (BZCT NFs) are designed in the polyvinylidene fluoride (PVDF) composite films. The composite films with different compositions of BZCT NFs gradient structure were prepared by layer-by-layer electrospinning, hot-pressing, and quenching processes. The microstructures and electrical properties have been studied, and the results indicate that the BZCT NFs gradient structures can simultaneously improve the polarization and the breakdown strength of the PVDF-based composite films, leading to the enhancement of energy storage density (9.8 J/cm3) compared to that of pristine PVDF films (4.2 J/cm3). This work provides an efficient route to improve the energy storage properties of polymer-based composite films by structure modulation.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）