SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yanan Li,Tingting Fan,Wenying Cui,Xia Wang,Seeram Ramakrishna,YunZe Long
Efficient treatment organic pollutants and oily wastewater with high toxicity under harsh environment is eagerly desired, while conventional membranes cannot meet the demand due to its poor chemical resistance which still remains a great challenge. Herein, biomimic polytetrafluoroethylene (PTFE) @ zeolite imidazole framework (ZIF-8) fibrous membrane for efficient photocatalytic organic pollutants degradation and oil-water separation under harsh environments was successfully developed, via electrospun PTFE nanofibrous membrane with numerous micro-nano rough papillae followed by in situ growth highly porous ZIF-8. The high surface area PTFE@ZIF-8 membrane with lotus-leaf-like structure exhibits excellent photocatalytic degradation performance to organic pollutants such as dyes (methylene blue and rhodamine B) and antibiotics (tetracycline) in harsh environments (strong acids/bases) with a remarkable high removal efficiency (99.99%). Meanwhile, the fluorinated PTFE@ZIF-8 membranes with super-hydrophobicity and super-lipophilicity property also exhibit outstanding oil/water separation performance (chloroform, kerosene, dichloromethane, toluene and n-hexane), with an extremely high flux of 2157 L m −2 h −1 (dichloromethane/water) and separation efficiency of 99.99% (kerosene/water). Furthermore, the membrane also able to separate water-in-oil emulsions effectively with an efficiency of as high as 99.99%. Most importantly, the robust PTFE@ZIF-8 membrane possesses excellent corrosion resistance, self-cleaning and recycling properties, which could still maintain such high separation efficiency and flux even after more than 10 cyclic oil-water separation tests under harsh environments. The multifunctional membrane with excellent harsh environment-tolerance offers an inspired strategy for efficient wastewater treatment under complex conditions and shows great potential for practical applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 75
·40019-40028
·
IF 3.708
Wei Zhong,Ying Yu,Chun Du,Wei Li,Yinzhen Wang,Guannan He,Yuandong Xie,Qinyu He
Buoyant photocatalysts which are able to remove organic pollutants under all lighting and weather conditions are in demand for the treatment of large volumes of organic wastewater. Buoyant carbon and nitrogen co-doped TiO2/polytetrafluoroethylene (NCT/PTFE) flakes which meet these requirements were prepared by the high-energy ball-milling of NCT powder and PTFE. The physicochemical properties of the as-prepared composite flakes were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible diffuse reflection spectroscopy (UV-vis DRS), Brunauer–Emmett–Teller (BET) surface area determination, and X-ray photoelectron spectroscopy (XPS), as well as electrical conductivity and density measurements. The density of the composite flakes was 0.93 g cm−3, slightly lower than that of water, rendering them buoyant. And the used-and- regenerated (by UV-vis irradiation for 8 h) flakes are also buoyant. Adsorption in the dark and photodegradation experiments indicated that the as-prepared flakes have high dark adsorption and high photocatalytic properties. The 6 h photodegradation ratio of methylene orange (20 mg L−1, 100 mL, as a model dye) is 96.6%, and a close degradation ratio of 97% can be obtained by three-cycle dark adsorption with minor stirring (1 cycle includes 8 h dark adsorption followed by 8 h regeneration by UV-vis irradiation per cycle). The high adsorption and good photocatalytic properties can be mainly attributed to the large BET surface area resulting from the small NCT particle size. The as-prepared flakes have the potential for use in organic pollutant adsorption at any time and can be regenerated through light irradiation when sunlight is available. This kind of environmental protection material has great practical significance due to its low cost, simple preparation, thermal durability, highly efficient organic pollutant removal, large-volume treatment capacity, recyclability, and the possibility of working at any time.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Shibo Liang,Lutao Peng,Qin Yi,Zhi Huang,Yanbin Luo,Zixuan Yang,Jinpeng Zhu,Bart Van der Bruggen,Lelin Zeng
Conventional polymer inclusion membranes (PIMs) exhibit suboptimal mechanical properties. Consequently, new composite PIMs were prepared by a modified solvent evaporation method using a PTFE base membrane, a PVC polymer, and an organic phosphonate extractant. Their chemical compositions and microstructures were analyzed by ATR-FTIR and FESEM. The mechanical and mass transfer properties of the composite PIMs were systematically investigated. The composite PIMs exhibited significantly higher tensile strength (36.86 MPa to 52.77 MPa), reduced tensile strain (76.49 % to 118.49 %), and enhanced bursting strength exceeding 0.2 MPa, compared to conventional PIMs. The Zn 2+ /Cu 2+ were separated with a high separation coefficient of 2003.19 by a retardant-enhanced composite PIM system. A new mass transfer model was developed by analyzing the multilayered structure of composite PIMs in depth. The apparent diffusion coefficient of Zn 2+ within PTFE-PVC composite layer (7.76 × 10 −14 m 2 /s) was found to be lower than that within polymer inclusion layer (3.18 × 10 −13 m 2 /s). The optimal regions of polymer inclusion layer thickness, contact area, and time were selected by model calculation for a certain separation task (e.g., purity ≥ 0.97 and yield ≥0.80 for Zn 2+ or Cu 2+ ). Finally, the retardant-enhanced composite PIMs were successfully used for selective separation of several other transition metal ions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Sikuai Xue,Chengcai Li,Jiuming Li,Hailin Zhu,Yuhai Guo
To improve hydrophilicity and anti-fouling property of the polytetrafluoroethylene (PTFE) flat microfiltration (MF) membrane, a facile method was developed to modify the membrane via the co-deposition of catechol (CA) and polyethyleneimine (PEI) followed by surface mineralization of γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560). The surface chemical composition, surface morphology, hydrophilicity and filtration performance of the PTFE flat membrane were investigated by ATR-FTIR, XPS, FESEM, WCA and pure water flux measurements, respectively. After using this low-cost and simple modification method, the PTFE flat membrane was endowed with excellent hydrophilicity, high water permeation flux and superior anti-fouling property. Then, the oil/water separation tests were conducted using the modified PTFE flat membranes. The size distribution of the oil droplets is between 0.12–1.44 µm and the mean pore size of pristine PTFE flat MF membrane is 0.22 µm. The as-prepared hydrophilized PTFE flat membranes possess an excellent oil resistant ability with oil rejection ratio near 99%. Finally, the surface stability of the modified membrane was studied and the mineralized membrane showed excellent acid resistant ability. Therefore, this facile strategy holds attractive potential practical application in water environmental remediation.
研究领域:
材料科学
·
环境工程
·
膜技术
·
表面化学
·
水处理
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Yuhong Cui,Shenghua Xue,Zihan Liu,Tiantian Wang,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
Nanomaterials play an important role in reducing friction and wear when used as lubricating additives. Due to synergistic effects , nanocomposites often have superior lubrication properties than individual materials. Therefore, based on the structural differences between MXene and phenolic resin modified polytetrafluoroethylene ( m PTFE), MXene@ m PTFE composites with multiple heterogeneous structures are designed and constructed. As expected, the synergistic effect of layered MXene and m PTFE nanoparticles endows MXene@ m PTFE excellent tribological performance . Under the action of shear force, m PTFE nanoparticles accelerate the interlayer slip between MXene nanosheets , and m PTFE nanoparticles with high hardness and thermal stability act as ball bearings to improve the extreme pressure characteristics of the oil. Compared to base oil (PAO-6), the coefficient of friction (COF) decreased from 0.644 to 0.111, the wear volume decreased by 92.7 %, and the bearing capacity increased to 750 N. This study provides new implications for the development of nanolubricant additives.
研究领域:
材料科学
·
机械工程
·
纳米技术
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Jian Wang,Jie Chen,Yaofeng Mao,Xingquan Zhang,Jun Wang,Fude Nie
Metal fuel with high energy and reactivity is an urgent need for the development of solid propellant, explosive and pyrotechnics. Herein, spherical B/Al/PTFE fuel is designed based on synergistic reaction effect between B/F and Al/F and prepared through the confinement-emulsion-templated method. The combustion reaction performance and pressure output performance of B/Al/PTFE microspheres are much better than their physically mixed counterparts. The synergistic reaction effect between B/F and Al/F on the reaction heat, flame propagation , and pressure output were systematically investigated through adjusting the B/Al mass ratio (30/0∼0/30). The DSC results show that the highest heat of combustion of 4904 J/g can be achieved when the B/Al mass ratio is 21/9. Furthermore, the combustion duration , peak pressure, and pressurization rate are monotonically accelerated from 653 ms, 352.15 kPa, and 305.67 MPa/s to 200 ms, 821.25 kPa, and 1831.18 MPa/s, respectively. This work provides a promising method for the design and preparation of highly composited metal fuel for practical application.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhipeng Tian,Weijie Zhang,Tao Liu,Jianping Liu,Chenguang Wang,Libin Lei,Mingzheng Liao,Chao Wang,Ying Chen
Hydrogen production by catalytic aqueous phase reforming (APR) of biomass-derived oxygenates is a promising route to produce hydrogen in a renewable way. As the typical APR catalyst, Pt/Al 2 O 3 is confronted with high methanation activity that consumes H 2 and produces undesired CH 4 during the treatment of methanol solution. In contrast, WGS reaction is the main pathway to boost H 2 generation during APR process. In this work, a series of PtFe/Al 2 O 3 catalyst with different Fe contents were prepared, characterized and tested for the methanol APR reaction. XRD , TEM, XPS and H 2 -TPR technologies were applied to study the change of physicochemical properties with the addition of iron. The restriction on methanation and promotion on WGS reaction were proved as well. With the increase of Fe content, the interaction between Pt and FeO x species have both positive and negative effects on APR reactivity while the CH 4 selectivity descending continuously from 9.25% to as low as 0.60%. Besides, the effects of reduction temperatures (250–350 °C) of Pt0.5Fe/Al 2 O 3 catalyst on APR performances were also investigated. An “Oxygen dynamic transfer cycle” between H 2 O/CO∗ and FeO x species with oxygen vacancies is proposed and verified. This indirect WGS reaction through lattice oxygen on FeO x species that boosting WGS reactivity helps improving H 2 selectivity in the gas products of methanol APR.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shengyong Lu,Xuanhao Guo,Manting Chen,Guanjie Wang,Juan Qiu,Jiaming Ding,Minghui Tang,Zhengdong Han,Yaqi Peng,Jianhua Yan
The synergistic removal of multiple pollutants from flue gas has attracted growing interest in recent years. In this study, Cu-doped MnCeO x catalysts were synthesized via an impregnation method and integrated into PTFE fibers using a split-film process to enable the simultaneous removal of chlorobenzene (CB) and nitrogen oxide (NO). Among the catalysts tested, Mn 2 Ce 1 Cu 0.6 O x exhibited the highest performance, achieving 90 % CB degradation and 100 % NO conversion at 180 °C. The PTFE-based catalytic fibers also demonstrated excellent removal efficiency, reaching 83.7 % for dioxins at the same temperature. A possible reaction mechanism is proposed in which the NH 3 -SCR process facilitates CB oxidation by generating reactive intermediates. Cu doping was found to enhance the density of acid sites and promote the ring-opening of CB, thereby suppressing chlorine accumulation and improving catalyst stability. These findings provide valuable insights for the development and optimization of catalytic bag filters for the efficient, synergistic removal of multiple pollutants from industrial emissions.
研究领域:
环境科学
·
催化材料
·
污染控制
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xinyu Han,Qiyuan Huang,Zhaolian Zhu,Muyao Li,Yuping Dai,Xuefei Gao,Yan Gao
Hydrogen peroxide (H 2 O 2 ) in situ production via 2-electron oxygen reduction reaction (ORR) exhibits several advantageous characteristics, including safety, convenience, environmental friendliness, and the potential to replace the traditional anthraquinone process. Nevertheless, ORR occurs at the gas–liquid-solid interface, where O 2 diffusion to the electrode and H 2 O 2 transfer from the electrode to the solution are easily limited by the pore structure of the electrode, thus reducing the efficiency of H 2 O 2 electrosynthesis. Herein, the graphite/PTFE electrodes with different pore structures were prepared using a salt template to improve the gas permeability and promote mass diffusion. A series of characterization methods, including SEM, CV, and LSV were used to investigate the effect of inorganic pore-forming agents on the electrode pore structures and their oxygen reduction activity. The pore size distribution and gas permeability of the electrode were determined by bubble point characterization. Furthermore, the impact of inorganic salt addition, current density, pH, and aeration on H 2 O 2 electrosynthesis was examined. The results demonstrate that the graphite/PTFE electrode with 0.15 g NH 4 Cl as a pore-forming agent (0.15 g-Ele) shows an obvious micron-sized honeycomb pore structure and has the highest gas permeability, contributing to the mass transfer and 2-electron ORR to produce H 2 O 2 . At a current density of 30 mA·cm −2 , pH = 3.0, and O 2 aeration rate of 400 mL·min −1 , the H 2 O 2 production of 0.15 g-Ele is found to be 425.4 mg·L -1 ·g catalyst -1 ·h −1 , with a current efficiency of 62.9 % at 60 min. The continuous and repeated use results also indicate that maintaining an abundant micron-sized honeycomb pore of the electrode is crucial for improving the H 2 O 2 production and current efficiency in electrosynthesis.
研究领域:
电化学
·
材料科学
·
环境工程
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2016
·Vol. 4
·期 5
·1601029
·
IF 3.365
Xing Zhong,Lei Wang,Zhenzhan Zhuang,Xianlang Chen,Jian Zheng,Yulin Zhou,Guilin Zhuang,Xiaonian Li,Jianguo Wang
Pt-based alloys are considered the universal choice among electrocatalysts for both hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). However, improving the electrocatalytic efficiency with the use of minimal amount of Pt is very challenging. A new strategy has been developed to fabricate a “double nanoporous” structure, in which nanoporous PtFe alloy (np-PtFe) is embedded in nanoporous graphene (NPG), through in situ etching and acid leaching treatments. The np-PtFe/NPG-700 served as an effective bifunctional catalyst for both HER and ORR, exhibiting higher activity and stability than 20% Pt/C. Theoretical calculations reveal that the graphene nanopores not only play a vital role in improving the stability of the nanoporous PtFe alloy but also downshift the d-band center of the PtFe alloy, thus improving the catalytic activity. The double nanoporous structure also provides numerous diffusion channels, which facilitated the mass and charge transport during HER and ORR.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xin Jin,Qi Xia,Jie Ding,Jian Shen,Chaohe Yang,Raghunath V. Chaudhari
Rational control of catalytic selectivity still remains a grand challenge in the field of biomass conversion to value-added chemicals. In this paper, we used PtFe catalyst as an example to understand fundamentals for lattice strain, electronic reconfiguration, reaction kinetics and catalytic selectivity for aqueous conversion biopolyols. Structurally strained face centered tetragonal (fct) PtFe crystals were synthesized and it was confirmed that such unique PtFe nanostructures display intriguing electronic coupling effect and partial charge distribution, as revealed by surface characterization using TEM, XRD and XPS, as well as DFT calculation. Bimetallic PtFe-fct catalysts exhibit a remarkable catalytic activity (TOF: 24 312 h–1 at 65 °C and 1 MPa O2), enhanced selectivity (tartronic acid: 54%) and improved stability for aqueous phase oxidation of biopolyols, in comparison with conventional fcc morphology. Kinetic modeling further indicates that relatively lower oxidation barrier and restrained decarboxylation reaction are key for improving selectivity on PtFe-fct catalysts.
研究领域:
化学工程
·
催化科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yang Li,Bingxuan Ji,Ziyang Chen,Zhenghua Zhang
Secondary effluent from municipal wastewater treatment plants can be used to produce reclaimed water through membrane distillation (MD), providing a potential solution to the current global water crisis. However, membrane fouling over extended periods of operation reduces the separation performance of MD systems and significantly shortens the operational life-span of the membrane. Herein, in order to overcome these limitations, a novel surface-modified PTFE membrane was fabricated by depositing polydopamine and grafting dextro ( d )-tyrosine (Tyr/PDA@PTFE). This synergistic coating was designed to reduce surface hydrophobicity of the PTFE membrane and provide anti-adhesive properties for bacteria, while enhancing flux and anti-fouling performance during MD. The Tyr/PDA@PTFE membranes demonstrated enhanced MD performance and the Tyr-300/PDA@PTFE membrane (with d -tyrosine coating solution concentration of 300 μM) exhibited the best MD performance during direct contact membrane distillation (DCMD) of the secondary effluent, with the highest flux (49.1 LMH) compared with the pristine PTFE membrane (34.7 LMH), achieving a flux increase of 41.5%. Long-term DCMD operation showed that the Tyr-300/PDA@PTFE membrane exhibited improved anti-fouling performance compared with the pristine PTFE membrane, with 43.8% flux decay observed after three cycles of use, while the pristine PTFE membrane was unable to complete three cycles of use with an 87.2% decrease in flux observed by middle of the third round. The quality of permeate formed by the Tyr/PDA@PTFE membranes during MD, indicated that they could be operated stably for three cycles of use over a 40 h period, intercepting organic matter in the feed solution. The Tyr-300/PDA@PTFE membrane was especially effective for the removal of low molecular weight and humus-like substances, achieving rejection rates of 89.5% and 86.7%, respectively. Additionally, the Tyr/PDA@PTFE membrane carried the more negative charge and exhibited a high level of resistance to bio-adhesion. This study demonstrates the feasibility of use of this novel Tyr/PDA@PTFE membrane in MD, for the effective treatment of secondary effluent from wastewater treatment plants and the production of reclaimed water.
研究领域:
环境工程
·
水处理
·
膜科学
·
废水回用
✓ 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）