CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujun Ju,Hailong Lin,Chen Chen,Ruien Hou,Zhe Wang,Tinglong Hao,Min Xu,Yu Tang,Fengjuan Chen
Covalent organic frameworks (COFs) have attracted significant attention in photocatalytic water purification due to their structural designability and sufficiently negative conduction band edges. However, the limited oxidation capacity of single COFs and the low utilization rate of photogenerated carriers result in suboptimal catalytic activity. To address these challenges, we propose a two-level regulation strategy that involves ligand engineering and the introduction of a piezoelectric field to enhance the photocatalytic performance of COF-based photocatalysts. In this study, we combined the piezoelectric material Bi 2 WO 6 with COFs modified with different ligands to design a series of Bi 2 WO 6 /R-COFs (R=H, F, CH 3 O) heterojunctions. Modifying COFs with –OCH 3 functional group tuned the local electron distribution, thereby remarkably improving photogenerated electrons transfer rate constant. Besides, the incorporation of Bi 2 WO 6 generated a piezoelectric field under ultrasound, which provides a strong driving force for photocatalytic. Meanwhile, the construction of the heterojunctions offered multi-channel for the generation of reactive oxygen species. As a result, the photocatalytic degradation rate of Bi 2 WO 6 /CH 3 O-COFs reached 93.5 % toward sulfamethoxazole within 48 min under ultrasound-coupled light irradiation, which is nearly three times higher than Bi 2 WO 6 /H-COFs. Furthermore, Bi 2 WO 6 /CH 3 O-COFs demonstrated superior degradation performance for other pollutants, including p-chlorophenol, bisphenol A, tetracycline, and phenol, with degradation efficiencies of 99.0 %, 98.4 %, 93.5 % and 88.1 %, respectively. This work proposes a two-level modulation strategy that significantly enhances the antibiotic degradation performance of COF-based catalysts, offering a new perspective for the design of photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yaode Li,Yanyu Wu,Sannan Zhang,Cong Qi,Zhiguo Zhang
Nanoparticles can improve the heat transfer effect of fluids, however, they are difficult to dissolve in the base fluid and are prone to fouling, agglomeration and sedimentation during flow, which affects their efficient heat transfer characteristics. In this paper, the inhibitory effect of high-voltage electric field on the agglomeration and deposition of TiO 2 nanoparticles in suspension was comparatively studied by comprehensive gravity sedimentation, spectrophotometer, particle size analysis, and zeta potential method. Studies have shown that the absorbance of suspensions is basically the same in neutral and acidic environments. However, in a highly alkaline environment, the agglomeration rate of nanoparticles increases significantly, resulting in a decrease in the absorbance of the suspension. The high-voltage non-uniform electric field generated by the active Cu rod electrode can effectively inhibit the agglomeration of TiO 2 nanoparticles. However, the suppression effect of an external electric field is not necessarily the higher the voltage, the better. Different nanomaterials have different critical voltages. The high-voltage electric field of 1 kV has the best inhibitory effect on the agglomeration and deposition of TiO 2 nanoparticles. An in-depth analysis of the mechanisms of the movement and agglomeration of TiO 2 particles in suspension under high-voltage electric field excitation was conducted. The result shows that the agglomeration and sedimentation of particles in suspension depend on the Zeta potential of the nano particles. The higher the absolute value, the more stable the dispersion system is.
研究领域:
材料科学
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热物理学
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纳米技术
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DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2019
·
IF 3.625
Qijun Wang,Yifei Li,Da-Wen Sun,Zhiwei Zhu
This work aimed at evaluating the effects of high-voltage electric field (HVEF) produced by an improved electrode system on the freezing behaviors and selected properties of agarose gel. The freezing of the agarose gel was realized by a Peltier cooler coupled with an improved electrode system. The electrode system was integrated with a dielectric spacer having high permittivity to avoid partial discharges. Results showed that HVEF combined with a low freezing rate significantly reduced the supercooling degree, enhanced the average freezing rate in particular the nucleation rate, and higher internal electric field intensity showed a better microstructure with smaller ice crystals in frozen samples. Under the highest applied voltage of 9 kV ( E i n = 1.09 E+05 V/m) tested in this study, a 100% supercooling release was achieved. Maximum reductions of 78.83%, 25.79% and 28.75% were observed for the nucleation time, tempering time and total freezing time, respectively, while the phase transition time was prolonged by 14.86% as compared with the control ( p < 0.05). Some reinforcement was detected in the gel strength by increasing internal electric field intensity, but not significant enough to prevent the structural damage and syneresis caused by freezing and thawing. This study suggested that HVEF-assisted freezing was able to reduce the size of ice crystals formed in semi-solid model foods, and the integration of a dielectric spacer with high permittivity to the electrode could be used as a potential method to solve the electrical discharge problem.
研究领域:
食品科学
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生物物理学
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冷冻技术
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DOI
高影响因子
INORGANIC CHEMISTRY
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2024
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IF 4.3
Yukai Chen,Yiyi Ji,Jiaojiao Fang,Huimin Wei,Dan Wang,Rulin Dong,Baoying Dai
The recombination of photoinduced carriers hampers the photocatalysis process. Construction of the heterojunction and built-in piezoelectric field boosts the separation of electrons and holes. Herein, a novel magnetic recyclable SnFe2O4(SFO)/ZnO composite with enhanced photocatalytic performance based on the dual electric field synergism was proposed for the first time. This composite apparently alleviates the carrier recombination in SFO and extends the absorption spectrum of ZnO to the full spectrum. Consequently, 20%SFO/ZnO exhibits an excellent efficiency, which is 2.45 times that of ZnO and 4.61 times that of SFO, respectively. The differences in size and morphology between the SFO nanoparticles and the ZnO nanorods provide more contact areas, thus enlarging the deformation and enhancing the piezoelectric effect. The heterojunction and the piezoelectric field work together to modulate the transferring of carriers and elevate the photocatalytic activity. This design offers a plausible avenue for preparing efficient recyclable photocatalysts for application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
·
IF 8
Wenhao Yu,Jianfei Li,Yao Cai,Degang Li,Yueyun Li,Zengdian Zhao,Shasha Song,Yan Liu,Luchang Qin,Bin Zhang
Graphitic carbon nitride (g-C 3 N 4 ) is a promising metal-free photocatalyst ; however, its high carrier recombination rate and insufficient redox capacity limit its degradation effect on antibiotics. In order to overcome these shortcomings, the photocatalytic activity is improved by regulating the spin polarization state, constructing the internal electric field, and applying the external piezoelectric field. In this paper, the chlorine-doped and nitrogen-deficient porous carbon nitride composite carbon quantum dots (N v -Cl/UPCN@CQD) has been synthesized successfully. The doping position of chlorine and spin polarization properties are verified by DFT calculation . The key intermediates *O 2 − and *OOH for the synthesis of reactive oxygen species were detected by in-situ infrared testing, which promotes the production of •O 2 − and H 2 O 2 . The degradation rate constant of N v -Cl/UPCN@CQD for removal of tetracycline is 8.45 times higher than that of g-C 3 N 4 . The active oxygen production and degradation efficiency of piezoelectric photocatalysis under the synergistic effect of intense stirring and vis-light irradiation are much higher than those of photocatalysis and piezoelectric catalysis, and the conversion of H 2 O 2 to •OH is promoted by piezoelectric field. This paper provides a reliable way to improve the performance of piezoelectric photocatalysts by adjusting their energy band, electronic structure and piezoelectric force.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
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IF 6.653
Yawei Feng,Hao Li,Lili Ling,Sa Yan,Donglai Pan,Hao Ge,Hexing Li,Zhenfeng Bian
The introduction of a piezoelectric field has been proven a promising method to enhance photocatalytic activity by preventing photoelectron–hole recombination. However, the formation of a piezoelectric field requires additional mechanical force or high-frequency ultrasonic baths, which limits its potential application on industrial scale. Therefore, it is of great practical significance to design the catalyst that can harvest the discrete energy such as the fluid mechanical energy to form the electric field. Herein, PZT/TiO2 catalyst with a core–shell configuration was prepared by a simple coating method. By collecting the mechanical energy of water, an internal piezoelectric field was induced. Under 800 rpm stirring, transient photocurrent measured on PZT/TiO2 electrode is about 1.7 times higher than that of 400 rpm. Correspondingly, the photocatalytic degradation rate and mineralization efficiency of RhB, BPA, phenol, p-chlorophenol much improved, showing the promoting effect of piezoelectric field generated directly from harvesting the discrete fluid mechanical energy.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2022
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IF 19.069
Yanhua Cui,Zengkai Wang,Binrong Li,Yan Yan,Ruibo Xu,Minjia Meng,Yongsheng Yan
Piezoelectric materials have been widely used in photocatalytic systems as it forms a built-in electric field to facilitate the migration of photo-induced charge-carriers. Herein, we report a three-dimensional (3D) porous g-C 3 N 4 /LiNbO 3 /PVDF membrane with an enhanced fluid-induced piezoelectric field for photocatalytic hydrogen evolution reaction (HER). The freezing phase inversion strategy is critical to the formation of piezoelectric sensitive β phase PVDF. The unique 3D porous membrane structure and the fluid-induced piezoelectric potential synergistically contribute to the HER efficiency under white light illumination. The as-prepared g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric photocatalytic membrane (19.6875 cm 2 in size) exhibited HER rate of 136.02 µmol h −1 , which was even higher than that of the g-C 3 N 4 /LiNbO 3 powder sample (111.8 µmol h −1 ) with the identical mass of catalyst particles . In-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) demonstrates a better water affinity of the porous g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric membrane prepared by the freezing phase inversion than other PVDF membranes prepared by traditional phase inversion and vacuum drying methods. Piezoelectric force microscopy (PFM), in-situ piezoelectric and piezoelectric current measurements further visualized the fluid-induced piezoelectric field on 3D g-C 3 N 4 /LiNbO 3 /PVDF membrane, by which boosting the HER efficiency.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 18
·2877
·
IF 4.7
Hui Zhang,Qizhang Yang,Songyi Lin,Zhaobin Yan,Xuancheng Wu,Wenqiang Wei,Guibing Pang
Seafood is highly perishable after being caught, making effective preservation technology essential. A few studies have explored the mechanisms of near-freezing storage combined with high-voltage electric fields for seafood preservation. This study uses near-freezing storage at −1 °C in conjunction with three high-voltage electric fields (5 kV/m, 8 kV/m, and 16 kV/m) to store large yellow croakers for 21 days and assesses their quality through sensory evaluation, pH values, malondialdehyde, total volatile basic nitrogen, and total viable counts. The results indicate that high-voltage electric fields effectively inhibit endogenous enzyme activity and microbial growth while reducing lipid oxidation in large yellow croakers. The preservation effect is optimal at an electric field strength of 16 kV/m, extending their shelf life by 9 days. These findings offer valuable theoretical and data-driven insights for applying near-freezing storage and electric field preservation technology in cross-regional fish transportation.
研究领域:
食品科学
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生物技术
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海洋生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiang Li,Binbin Dan,Shixuan Li,Xiang Liu,Di Wang
The sluggish kinetics linked to CO 2 evolution reaction (CO 2 ER) processes, coupled with substantial electrode passivation, impose considerable constraints on the practical application of Li-CO 2 batteries. This study utilized ultrasound tech to enhance the synergistic modulation of defects and piezoelectric properties. By the concurrent creation of high-concentration oxygen vacancies (OVs) and the amplification of the inherent piezoelectric polarization field in BaTiO 3 material, the hysteresis of CO 2 ER processes and the occurrence of electrode passivation in Li-CO 2 batteries has been significantly improved. Further investigations reveal that high OV concentrations cause electronic structure reconstruction, leading to band gap contraction and Fermi energy level upshift, meanwhile, the augmented piezoelectric polarization field facilitates the directional migration of carriers, facilitating the growth of Li 2 CO 3 via the inherent electric field. Based on this synergistic mechanism, reversible decomposition of Li 2 CO 3 has been realized and Li-CO 2 cells with ultrasonic BTO cathode even exhibits a long cycle life of 375 cycles at the current density of 500 mA g −1 . This one-step physical field synergistic regulation of defect states in ferroelectric materials and their piezoelectric properties establishes a novel paradigm and mechanistic foundation for overcoming efficiency bottlenecks in piezoelectric catalytic systems and Li-CO 2 batteries.
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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纳米催化
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固态离子学
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Hang Yang,Dong Tu,Yi Wei,Xinru Huang,Haonan Ju,Wei Wang,Fan Xia,Xiuguo Chen,Guogang Li
Owing to the unique mechano-optical response, mechanoluminescence (ML) materials possess dynamic, sensitive, visual, and recoverable strain sensing capabilities. However, the dilemma of lacking outstanding ML materials with high detection precision under micro deformations still exists, thereby hindering advanced applications in multi-angle and multidimensional scenarios. Herein, a novel Pr 3+ -doped perovskite oxide (NaTaO 3 :Pr 3+ )-based composite elastic thin film is developed, which achieves ultrasensitive ML responses to both microscale compressive and tensile strains. Compared with the record of LiTaO 3 :Tb 3+ , the corresponding deformation detection limit has been improved by five times, reaching 0.01%, which is comparable to the performance of the widely used piezoresistive and capacitive sensors. The results reveal that the ML originates from the interaction between adjacent defects and the varying local piezoelectric fields near Pr Na O 9 and Pr Ta O 6 polyhedra. Most notably, the strain and ML demonstrate identical distributions on a 3D-printed model coated with NaTaO 3 :Pr 3+ thin film even under micro deformation less than 0.4%, highlighting the significant potential of NaTaO 3 :Pr 3+ for advanced 3D microstrain sensing applications. This work provides convincing insights into the investigation of ML mechanisms through local trap and piezoelectricity analyses, along with an exemplificative application in advanced strain sensing and visualization at microscopic and multidimensional scales.
研究领域:
材料科学
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纳米科技
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固态物理
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传感器技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Tingting Cao,Liping Lin,Yanan Li,Wangshu Tong
Piezoelectric molybdenum disulfide (MoS 2 ) has emerged as a promising candidate for peroxymonosulfate (PMS) activation in advanced oxidation processes (AOPs), yet the mechanistic role of its piezoelectric field, particularly regarding the electron transfer process, is not fully understood. Herein, we construct a MoS 2 /PVDF-HFP (MP) piezoelectric composite film stimulated by ultrasound to elucidate the piezoelectric field's enhancement effect on PMS activation for singlet oxygen ( 1 O 2 ) generation. Notably, the ultrasound-induced piezoelectric field enhanced 1 O 2 production by 26-fold compared to the non-piezoelectric system, leading to significantly improved degradation efficiency (≈94 % within 60 min) of methylene blue (MB). Through a combination of experimental analysis and density functional theory (DFT) calculations, we demonstrate that the piezoelectric field enhances the adsorption of PMS onto the MoS 2 surface (evidenced by a change in adsorption energy from –0.33 eV to –0.42 eV) and facilitates interfacial electron transfer (with an increase of 0.04 e⁻ transferred per PMS molecule), thereby promoting the conversion of PMS to 1 O 2 . This work elucidates the enhancement mechanism of the electron transfer process in the MoS 2 -PMS system and provides a film-based strategy for designing efficient, ultrasound-driven piezoelectric AOPs targeting selective 1 O 2 generation.
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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物理化学
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纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4280-4291
·
IF 11.9
Ya Liu,Wangshu Tong,Wanting Song,Tingting Cao,Yulun Liu,Lingchao Wang,Zhihao Wang,Yihe Zhang
Piezocatalysis can be used to harvest widely existing and renewable mechanical vibrations in the environment to convert mechanical energy into chemical energy, which is employed in various important applications, and typically, the polyvinylidene fluoride (PVDF)/graphene composite piezocatalyst is used because of its recyclability, flexibility, and easy preparation. However, its poor piezocatalytic performance, primarily attributed to the wrapped graphene in the PVDF matrix that prevents the generated charges from fully accessing pollutants, remains a challenge. Herein, we use phase conversion and the “self-assembly strategy” to prepare a sandwich film called PVDF-hexafluoropropylene@reduced graphene oxide (PVDF-HFP@rGO) with PVDF-HFP as the interlayer and rGO as the outer layer to fully expose rGO. Under magnetic stirring at 600 rpm, the degradation efficiency of PVDF-HFP@rGO toward methylene blue reaches ∼98% within 60 min, higher than those of the traditional composite film (∼75%) and pure PVDF-HFP film (∼8.0%). The charge supply by rGO, piezoelectric field provision by PVDF-HFP, and advantage of the sandwich structure are verified through contrast experiments under different conditions such as changing rGO band structures, varying PVDF-HFP interlayer thicknesses, and using different layer structures, respectively. Therefore, the enhanced piezocatalytic performance of the sandwich structure provides new insights into the structural design of high-performance PVDF/graphene composite piezocatalysts.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）