SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Antuo Wang,Xianglong Li,Teng Hou,Yishen Lu,Jing Zhou,Xianggui Zhang,Bin Yang
Recently, the membranes with durable and highly efficient separation performances for the purification of oil/water emulsions have drawn wide concern due to the great potential application in solving the problem of offshore oil spill and the discharge of oily wastewater. However, the crucial issues of low-permeability and severe membrane fouling seriously affect their application. Herein, we created an ultrafine tree-grapes-like poly(tetrafluoroethylene) (PTFE) fibrous membrane (UTPFM), which aimed to provide a fibrous membrane with ultrahigh permeability and separation efficiency. The fibrous membrane with regular grapes on fiber surface was fabricated by sintering electro-centrifugal spinning ultrafine fibrous poly(vinylpyrrolidone) (PVP)/PTFE membranes. The size and number of grapes could be simply controlled by the PVP/PTFE ratios, and brought water contact angle (WCA) of obtained fibrous membrane up to 154.6°. As a result, the obtained fibrous membrane presented ultrahigh permeability up to 3200 L m -2 h −1 and high separation efficiency more than 99%. Moreover, the grape structures on fiber surface were demonstrated to bring without any changes after 1000 cycles of abrasion. Therefore, the obtained membrane exhibits a great potential application in the long-term, stable and efficient oily wastewater separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Simin Yang,Jianqiang Wang,Yang Wang,Yajie Ding,Weilin Zhang,Fu Liu
Interfacial polymerization has been considered as a benchmark strategy for polyamide membrane fabrication. However, controlled reaction is still challengeable. Herein we propose a novel emulsion mediated interfacial polymerization strategy for controllable polyamide nanofiltration fabrication. Hexane micro-droplets containing trimesoyl chloride (TMC) molecules were adsorbed, demulsified and transported to the interface from hexane-in-water emulsion by a hydrophobic and oleophilic polytetrafluoroethylene (PTFE) membrane for further controlled reaction with piperazine (PIP). Surface morphologies, layer thickness, surface chemistry, crosslinking and water contact angle of resulted polyamide membranes were studied with varying reaction time, displaying the control for interfacial polymerization. PTFE membrane assisted interfacial polymerization strategy leads to smoother (Ra = 8.0 nm) and thinner (25 nm) polyamide layer compared with conventional interfacial polymerization. The resulted membrane exhibits comparable nanofiltration performances (water permeability: 7.3 Lm −2 h -1 bar −1 , Na 2 SO 4 rejection: 92.3%) with conventional membranes. The current study provided a new avenue for controllable interfacial polymerization.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Hongwei Xu,Yilin Zhang,Xiaxia Chen,Chenxi Guo,Mingyang Xu,Chao Liu,Jianguang Qi,Peizhe Cui,Yinglong Wang,Zhaoyou Zhu,Fanqing Meng
Piezoelectric catalysis has emerged as a highly effective strategy for the removal of organic pollutants from wastewater. Although the piezoelectric properties of polytetrafluoroethylene (PTFE) are well-established, the development of efficient charge transfer channels on PTFE to enhance its piezoelectric catalytic activity remains a significant challenge. In this study, we synthesized a CuCl 2 /PTFE piezoelectric catalyst via ball milling. The optimized CuCl 2 /PTFE degradation rate of tetracycline was 92.1 %, and the kinetic constant was 0.62 min −1 . The CuCl 2 /PTFE catalyst with a kinetic constant 4.97 times higher than PTFE. Combined with density functional theory (DFT) calculations, we propose a plausible piezoelectric catalytic degradation mechanism. The doping of CuCl 2 reduces the band structure of PTFE and promotes the separation of e − and h + , further producing ∙O 2 − , 1 O 2 and ∙OH to participate in the degradation of antibiotics. This work provides valuable theoretical insights for the application of piezoelectric catalysis in environmental remediation and clean energy production.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Yuanlu Xu,Yi Zhu,Chunyang Song,Yinan Chen,Chengwen Song,Zaijin You,Xinfei Fan
Oil spills and oily wastewater from various industries caused severe harm to the environment and human life. Then the effective treatment of oily wastewater is extremely urgent. Superhydrophilicity/underwater superoleophobicity membranes are considered as a favorable choice for the separation of oily wastewater. In this work, inspired by mussel adhesive protein chemistry , the SiO 2 /PDA/PTFE membrane (SPP) with hydrophilic chemical components and multi-scale rough structures was prepared by the facile combination of dopamine self-polymerization and sol-gel strategy. The hydrophilic SiO 2 nanoparticles (NPs) and polydopamine layer can be co-deposited on the membrane surface through Michael addition reaction, thus avoiding the problem of coating damage during oil/water separation. Moreover, the SiO 2 /PDA layer has hydrophilic groups and micro/nano rough structure, which makes the SPP membrane possess superhydrophilic and underwater superoleophobic properties. The properties of SPP membrane facilitate the formation of a hydration layer on the membrane surface, thus minimizing direct contact with oil droplets. During the experiment of oil/water separation, SPP membrane demonstrated excellent separation ability, the permeation flux of SPP membrane was measured to be 6183 and 4389 L m −2 h −1 for oil-water mixture and oil-in-water emulsion, respectively. The oil/water separation efficiency had also reached more than 99.7%. In addition, the SPP membrane exhibited brilliant chemical stability under harsh environments. It is worth mentioning that the SPP membrane showed superior cycling and anti-fouling performance in the separation process. These excellent performances demonstrate the great potential of SPP membranes in the industrial applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 44
·e202404251
·
IF 1.9
Zichao Yin,Zhenhua Sun,Junyi Li,Haigang Zhou,Jingjing Qi,Weidong Wang
Graphical A multifunctional coating composed of PTFE, PDMS, and nano silica was successfully prepared via deposition coating and heating treatment in this study, which possessed excellent anti-corrosion, anti-scaling, anti-fouling, anti-icing, and self-cleaning properties. This superhydrophobic coating can be loaded onto various facilities and equipment as top finish, protecting the substrates from water containing contaminants. This coating may have broad applications in the field of metal substrate protection. PTFE-based superhydrophobic coatings have received increasing research and the fabricated coatings exhibited excellent anti-corrosion, anti-scaling, anti-fouling, and anti-icing properties. In order to further enhance the hydrophobicity of PTFE coating, a PTFE-based coating consisted of nano-silica and polydimethylsiloxane (PDMS) was fabricated by deposition coating and annealing treatment. The water contact angle and sliding angle of the coating achieved 160.65° and 3.02°, respectively, demonstrating it possessed superhydrophobic property. Due to its excellent surface feature, the coating exhibited resistance to milk, coffee, and mud water, and could be easily cleaned by water flow. Besides, the water droplet on the coating had a longer freezing time and the ice droplet could be easily removed from the coating. Ascribed to the abundant nonpolar groups and the air cushion formed under water, the prepared coating had outstanding anti-scaling and anti-corrosion properties. The electrochemical impedance of the steel plate with the coating (above 9000 Ω·cm 2 ) increased by two orders of magnitude compared with the non-coating one (78.2 Ω·cm 2 ), and the anti-scaling rates of the coating towards BaSO 4 and SrSO 4 were all above 80%. It is promising that the coating will be a competitive candidate in many application fields.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
In micro-injection molding, polymer/mold interface adhesion may cause severe deformation or damage of micro features on the molded products. To reduce the interface adhesion and improve the molding quality of polymer microfluidic chip, Ni-P-PTFE (polytetrafluoroethylene) ternary composite was adopted to electroform mold insert with self-lubricating properties. The influence of phosphorous acid concentration on the composition and performance of Ni-P-PTFE composites was systematically investigated. Our results demonstrated that the content of P and PTFE particles in the composites raised with an increase in phosphorous acid concentration. Elevated phosphorous acid concentration adversely affected the current efficiency and slowed down the deposition rate, allowing sufficient contact time for PTFE to transfer and adsorb onto the electrode surface. The hardness of the deposited nickel increased from 310 HV to 510 HV in the Ni-P-PTFE composites. Furthermore, the Ni-P-PTFE composites demonstrated excellent self-lubricating properties, showcasing friction coefficients of 0.15 and 0.25 during the initial and steady stages, respectively, representing a notable reduction of 66.7 % and 64.3 % compared to pure nickel. This study provides a novel approach to fabricate molds with self-lubricating properties, which contributes to the high-precision injection molding of polymer-based micro devices.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Pingping Gao,Zhiyong Xie,Xiaobo Wu,Chun Ouyang,Ting Lei,Piaopiao Yang,Chunbo Liu,Junbin Wang,Tao Ouyang,Qizhong Huang
A highly corrosion resistant and conductive carbon/PTFE/TiN composite coating on Ti bipolar plates is prepared by a two-step hydrothermal and impregnation process. The composite coating exhibits a full coverage with uniformly distributed PTFE and TiN particles when 0.1 mol/L of glucose is used as carbon source and 10 wt % PFTE + 3 g/L TiN suspension as impregnating solution. The as-prepared composite coating film shows 0.009 μA cm −2 of corrosion current density and 13 mΩ cm 2 of ICR in the simulated solution of proton exchange membrane fuel cells, respectively. Meanwhile, the potentiostatic polarization test shows that the corrosion current density of the composite coating is below 1 μA cm −2 under real PEMFC working conditions of the cathode (0.6 V) and anode (−0.1 V). Additionally, the composite coating enhances hydrophobic property with a static contact angle of 120.2°and 115.5°before and after polarization test, respectively. In summary, the Ti substrate with carbon/PTFE/TiN composite coating shows a great potential application as bipolar plates of PEMFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 42
·20301-20306
·
IF 6.97
Mingxing Gong,Jing Zhu,Mingjie Liu,Peifang Liu,Zhiping Deng,Tao Shen,Tonghui Zhao,Ruoqian Lin,Yun Lu,Shize Yang,Zhixiu Liang,Seong Min Bak,Eli Stavitski,Qin Wu,Radoslav R. Adzic,Huolin L. Xin,Deli Wang
Rational designing of catalysts to promote the sluggish kinetics of the cathode oxygen reduction reaction in proton exchange membrane fuel cells is still challenging, yet of crucial importance to its commercial application. In this work, on the basis of theoretical DFT calculations which suggest that order structured fct-phased PtFe (O-PtFe) with an atomic Pt shell exhibits superior electrocatalytic performance towards the ORR, the desired structure was prepared by using a scalable impregnation–reduction method. The as-prepared O-PtFe delivered enhanced activity (0.68 A mg−1Pt) and stability (73% activity retention after 10 000 potential cycles) compared with the corresponding disordered PtFe alloy (D-PtFe) and Pt. To confirm the excellent durability, in situ X-ray absorption fine structure spectroscopy was conducted to probe the local and electronic structure changes of O-PtFe during 10 000 cycle accelerated durability testing. We hope that this facile synthesis method and the in situ XAFS experiment could be readily adapted to other catalyst systems, facilitating the screening of highly efficient ORR catalysts for fuel cell application.
研究领域:
材料科学
·
催化化学
·
能源技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1806
·
IF 4.324
Dawei Li,Huizhong Liu,Ying Shen,Huiping Wu,Feng Liu,Lanlan Wang,Qingsheng Liu,Bingyao Deng
Electrospun nanofiber, showing large specific area and high porosity, has attracted much attention across various fields, especially in the field of air filtration. The small diameter contributes to the construction of filters with high-filtration efficiency for fine particulate matter (PM), however, along with an increase in air resistance. Herein, composited nanofiber aerogels (NAs), a truly three-dimensional (3D) derivative of the densely compacted electrospun mat, were constructed with the blocks of polytetrafluoroethylene–polyamideimide (PTFE–PAI) composite nanofiber and polyimide (PI) nanofiber. PI/PTFE–PAI NAs with hierarchically porous architecture and excellent mechanical properties have been obtained by thermally induced crosslink bonding. Results indicated that sintering at 400 °C for 30 min could complete the decomposition of polyethylene (PEO) and imidization of polyamic acid (PAA) into PI, as well as generate sufficient mechanical bonding between adjacent nanofibers in the NAs without extra additive. The well-prepared PI/PTFE–PAI NAs could withstand high temperature up to 500 °C. In addition, the filtration tests illustrated that the composite NAs had an excellent performance in PM filtration. More importantly, the filtration behavior could be adjusted to meet the requirements of various applications. The excellent thermal stability and high-filtration efficiency indicated its great potential in the field of high-temperature air filtration.Keywords:nanofiber-based aerogels;PTFE–PAI nanofiber;high-efficiency filter;PM2.5;hierarchical porous architecture
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yuan Sheng,Wenxing Zhu,Zhijian Li,Shuo Li,Liangbin Shao,Jianguo Wang
Green hydrogen production by alkaline water electrolysis is an important technology in the decarbonization of the current industry. However, its large-scale application is limited by mediocre performance of conventional Raney Ni electrocatalysts. Herein, high-performance NiMoZn alloy catalysts of the Raney Ni type are developed by pulse electrodeposition for the hydrogen evolution reaction (HER). The optimized catalyst, NMZ-CA, exhibits an overpotential of 37 mV at 10 mA⋅cm −2 and a Tafel slope of 27 mV⋅dec −1 in 1 mol·L –1 KOH. Tafel slope measurements, X-ray photoelectron spectroscopy, and H 2 temperature-programmed desorption experiments show that the incorporation of Mo and Zn in Ni weakens the binding of HER intermediate (H ads ) on strongly adsorbing sites, leading to improved electrochemical kinetics. Electron microscopy and X-ray diffraction study reveals that a phase-pure Mo-doped Ni 2 Zn 11 intermetallic precatalyst formed via pulse electrodeposition and subsequent heat treatment is key to the structure integrity and performance of the catalyst after activation by alkaline leaching. Modification of NMZ-CA with PTFE enhances its HER performance by facilitating gas removal and improving structure integrity. A practical alkaline water electrolyzer built on the modified NMZ/PTFE-CA electrode delivers 2.0 A⋅cm −2 at 1.92 V cell voltage and operates for 250 h without decay. This work provides insights into the synergy between Ni, Mo, and Zn in Raney Ni-type catalysts, and demonstrates the hydrophobic modification as an effective strategy for electrode development in high-performance alkaline water electrolysis.
研究领域:
材料科学
·
电化学
·
能源化学
·
催化化学
·
纳米材料
·
可再生能源
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 45
·46705
·
IF 1.901
Dapeng Gu,Longxiao Zhang,Suwen Chen,Kefeng Song,Shouyao Liu
The filling combination of polytetrafluoroethylene (PTFE)/Cu/Al 2 O 3 filled poly(methyl methacrylate) (PMMA) based composites aiming at low friction and wear is optimized based on L 9 (3 4 ) by Taguchi method. The worn morphologies of PMMA based composites are analyzed by scanning electron microscopy (SEM). The PTFE transfer film and the wear debris on the steel ball surface are analyzed by SEM and X-ray spectroscopy. It is observed that the friction and wear of PMMA can be obviously decreased by filling with PTFE, Cu, and Al 2 O 3 . PTFE has the most significant but Cu has the negligibly smallest contribution on both the friction coefficient and the wear rate. The lower friction coefficient (<0.2) appears by the combination of the mass ratio of PTFE larger than about 4.5% and the mass ratio of Al 2 O 3 lower than ∼7.5%. The lower wear rate (<5 × 10 −5 mm 3 /Nm) appears by the combination of the mass ratio of PTFE larger than about 5% and the mass ratio of Al 2 O 3 lower than ∼8%, but it does not include that PTFE is greater than about 8.5% and Al 2 O 3 is less than about 1.5%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46705.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
Defence Technology
·
2023
·
IF 5.1
Jian Wang,Jie Chen,Yaofeng Mao,Yongjun Deng,Wei Cao,Fude Nie,Jun Wang
Metal (aluminum and boron) based energetic materials have been wildly applied in various fields including aerospace, explosives and micro-devices due to their high energy density. Unfortunately, the low combustion efficiency and reactivity of metal fuels, especially boron (B), severely limit their practical applications. Herein, multi-component 3D microspheres of HMX/B/Al/PTFE (HBA) have been designed and successfully prepared by emulsion and solvent evaporation method to achieve superior energy and combustion reactivity. The reactivity and energy output of HBA are systematically measured by ignition-burning test, constant-volume explosion vessel system and bomb calorimetry. Due to the increased interfacial contact and reaction area, HBA shows higher flame propagation rate, faster pressurization rate and larger combustion heat of 29.95 cm/s, 1077 kPa/s, and 6164.43 J/g, which is 1.5 times, 3.5 times, and 1.03 times of the physical mixed counterpart (HBA-P). Meanwhile, HBA also shows enhanced energy output and reactivity than 3D microspheres of HMX/B/PTFE (HB) resulting from the high reactivity of Al. The reaction mechanism of 3D microspheres is comprehensively investigated through combustion emission spectral and thermal analysis (TG-DSC-MS). The superior reactivity and energy of HBA originate from the surface etching of fluorine to the inert shell (Al 2 O 3 and B 2 O 3 ) and the initiation effect of Al to B. This work offers a promising approach to design and prepare high-performance energetic materials for the practical applications.
研究领域:
材料科学
·
燃烧与爆炸学
·
能源材料
✓ 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）