INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Mingyue Zhao,Lanfeng Hui,Yang Gao,Qian Yang,Yang Cheng,Yu Hu
Developing highly efficient and convenient nanofibrous composites holds great significance for the separation of water-in-oil emulsions. In this paper, we present a reusable porous fiber composite material obtained by using stearoyl chloride modified cellulose and polyvinylidene fluoride (PVDF) for electrospinning. The modified cellulose stearyl ester (CSE) enhances the hydrophobicity and lipophilicity of the composites. The PVDF/CSE-8:2 nanofibrous membrane exhibits a water contact angle of up to 155°, a separation flux of up to 2715 L·m −2 ·h −1 , and a separation efficiency of over 97% under gravity for oil-water surfactant-stabilized emulsions. Simultaneously, the interaction between CSE and PVDF improves the mechanical properties of the nanofibrous membrane, with the tensile strength of the PVDF/CSE-8:2 nanofibrous membrane (24.3 MPa) being twice that of pure PVDF. Thus, composite nanofibrous membranes can be environmentally friendly through the use of sustainable, low-cost biomass resources to reduce the use of petroleum-based polymers. These properties give PVDF/CSE nanofibrous membranes great potential for commercial oil-water separation.
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
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shuaijun Yu,Hao Qian,Junbin Liao,Jun Dong,Lu Yu,Chunhong Liu,Jiangnan Shen
Recovery of sulfuric acid from industrial wastewater via electrodialysis (ED) has become a hot topic recently. Since the commercially used anion exchange membranes (AEM) generally lead to the severe proton leakage during ED process, the efficiency of the acid recovery was seriously affected. In this work, a series of proton blockage cross-linking AEM has been prepared by modifying poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF- co -HFP) with 1-vinylimidazole, followed by crosslinking with 1,4-dibromobutane. Our investigation demonstrates that the as-prepared PVDF- co -HFP-based AEM has the observable asymmetric structure on the two sides of the AEM with a smooth and dense surface and a rough and porous surface. The asymmetric structure and the hydrophobicity of the fluorinated backbone of AEM render the improved proton blocking performance, and the increased electrical efficiency and reduced energy consumption of acid recovery. For example, the optimized AEM (AEM-0.5) exhibits the acid concentration with the values of c H + = 2.04 M (initial proton concentration: 1.0 M) in concentrate cell during 12 h-ED process at current density of 20 mA cm −2 and low energy consumption of 1.75 kw·h·kg −1 relative to the commercial NEOSEPTA® AHA and proton blockage ACM AEM. It is believed that this study can provide a guideline for designing advanced proton blocking AEMs.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 67
·62302-62309
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IF 3.289
Ziyang Wu,Haibo Lin,Yunze Wang,Xuemin Yu,Jinglong Li,Zhu Xiong,Yi Wang,Youju Huang,Tao Chen,Fu Liu
Poly(vinylidene fluoride) (PVDF) membranes have been widely applied to treat wastewater, however, the removal of toxic aromatic phenolic compounds remains a technical challenge due to the serious adsorption fouling and difficult degradation. Herein, we aimed to design a superhydrophilic PVDF membrane decorated with Au nanoparticles, which enhanced the rapid degradation of p-nitrophenol (4-NP). The superhydrophilic PVDF membrane with a micro/nano structured surface was decorated with Au nanoparticles via poly(dopamine) (PDA) as a spacer. The influences of membrane affinity (e.g. Hydrophilic Membrane (HM), micro/nano structured superhydrophilic membrane (MSiM), and micro/nano structured superhydrophobic membrane (MSoM)) on PDA deposition and the subsequent Au decoration were comprehensively investigated. The synthesized Au nanoparticles were characterized using transmission electron microscopy (TEM) and UV-vis absorption spectra. The morphology and composition was evaluated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Static catalytic experiments demonstrated that MSiM degraded over 90% of 4-NP in 5 minutes with a kinetic reaction rate constant of 47.84 × 10−2 min−1 and high stability over 6 cycles. A membrane catalytic reactor (MCR) was designed to realize the continuous catalytic degradation of 4-NP with a kinetic reaction rate constant of 7 × 10−2 min−1.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
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IF 3.138
Haiye Wang,Xinzhen Zhao,Chunju He
A novel zwitterionic surface of PVDF membrane with significantly improved antifouling properties was prepared though pressure-assisted layer by layer self-assembly method based on the electrostatic interactions of chitosan (CS), sodium alginate (SA) and polyfunctional lysine. For the modified C-S-C-S-L membrane, the contact angle decreased to 35°, the bovine serum albumin (BSA) adsorption mass of static fouling on the membrane surface decreased to 10 μg/cm 2 , and the secondary water flux recovery rate (FRR) of dynamic fouling of BSA and humic acid (HA) pollutants increased to 98% and 99%, respectively, exhibiting excellent antifouling performance. The results demonstrated that using charged bio-macromolecules and amino acids to build zwitterionic surface was effective and convenient to change the interface properties of the separation membrane through the pressure-assisted self-assembly modification method, and provided a new way for the industrial scale hydrophilic modification of hydrophobic porous membrane materials.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3201
·
IF 5.076
Huijun Li,Xin Xu,Jiwei Wang,Xuefeng Han,Zhouqing Xu
Tetracycline (TC) contamination in water has progressively exacerbated the environmental crisis. It is urgent to develop a feasible method to solve this pollution in water. However, polluted water often contains oil. This paper reported a glass fiber (FG)-assisted polyvinylidene fluoride (PVDF) hybrid membrane with dual functions: high TC degradation efficiency in emulsion and oil-water separation. It can meet the catalytic degradation of tetracycline in complex water. This membrane was decorated by coating the glass fiber with PVDF solution containing hydrophilic graphene oxide hybridized NH2-MIL-101(Fe) particles. Moreover, due to its strong mechanical strength enhanced by the glass fiber, it can be reused as TC degradation catalysts for dozens of times without cracking. Thanks to the hydrophobicity of PVDF and the surface pore size of MOFs, the prepared membrane showed a good oil-water separation performance. Besides, the hydrophilic graphene oxide (GO) and NH2-MIL-101(Fe) improved the membrane’s anti-fouling performance, allowing it to be reused as the separation membrane. Therefore, the outstanding stability and recoverability of the membrane make it as a fantastic candidate material for large-scale removal of TC as well as oil-water separation application.Keywords:GO/NH2-MIL-101(Fe);PVDF membrane;glass fiber;tetracycline degradation;oil-water separation
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Binrong Li,Huijie Wang,Yiying Lan,Yanhua Cui,Yunlei Zhang,Yonghai Feng,Jianming Pan,Minjia Meng,Chundu Wu
Fe species/biochar fiber composite (FCF) has become one of promising materials for wastewater treatment via heterogeneous photo-Fenton reaction. However, the powdered form always suffers from inefficient recovery and inherent iron loss, limiting their practical application. Herein, we provide an alternative polydopamine (pDA)-modified PVDF bead as excellent photo-Fenton support for immobilizing FCF by phase inversion, which not only limits the loss of iron ions, but also promotes the H 2 O 2 decomposition. Moreover, these beads can float on the wastewater due to their inner structure, favoring the harvest of light. Thanks to these unique characteristics, these beads displayed almost 100% of decolorization in self-designed flowing dyes wastewater systems. Particularly, the self-floating beads structure makes catalysts be easily recovered and maintains long-term high activity, which significantly eliminates the inherent challenge of powdered catalyst (e.g. FCF) based degradation process. This work provides an “easily applicable platform” for large-scale applications of powdered photo-Fenton catalyst in wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Xing Long,Ya-Shuo Chen,Qian Zheng,Xing-Xiao Xie,Hao Tang,Li-Ping Jiang,Juan-Tao Jiang,Jian-Hua Qiu
Metal-organic frameworks (MOFs) are capable in capture and storage of iodine ions with high efficiency, and polymer/MOF nanocomposite membrane has the potential to be used for efficient removal of iodine from radioactive wastewater. In this work, we have reported a PVDF/ZIF-8 nanocomposite adsorption membrane prepared by contra-diffusion method. The combination of surface graft of poly(4-vinylpyridien) brushes and optimal addition of sodium formate into ligand contributes to the formation of a well-intergrown and continuous ZIF-8 layer on the metal ions side surface of PVDF- g -P4VP membrane. In the batch adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits high affinity for iodine following a pseudo-second-order kinetics and fitting the Freundlich isotherm model with a maximum adsorption capacity of 73.33 mg/g. In the dynamic adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits a high flux of 66.19 L/(m 2 ⋅h⋅MPa) and an iodine removal efficiency of 73% until 180 min. Initial iodine concentration has a little influence on the iodine removal efficiency, but solution pH shows a significant effect. The iodine removal efficiency can be maintained around 92% in a weakly alkaline medium of pH = 8. The PVDF/ZIF-8 nanocomposite membrane possesses an excellent reusability with an iodine removal efficiency of 73.4% after five cycles.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zhengzhong Zhou,Lili Xu,Xue Zhu,Qian Wang,Xiaoshan Meng,Taoli Huhe
In this study, a photocatalytic biochar-TiO 2 (C–Ti) composite was prepared using lignin as carbon precursor, and blended with PVDF polymer to fabricate PVDF/C–Ti MMMs via non-solvent induced phase inversion. The prepared membrane demonstrates both 1.5 times higher initial and recovered fluxes than the similarly prepared PVDF/TiO 2 membrane, suggesting the C–Ti composite can help maintain higher photodegradation efficiency and better anti-fouling performance. In addition, the comparison of PVDF/C–Ti membrane against pristine PVDF membrane show that the reversible fouling and photodegradation reversible fouling of BSA increased from 10.1% to 6.4%–35.1% and 26.6%, respectively. And the FRR of PVDF/C–Ti membrane was 62.12%, 1.8 times that of PVDF membrane. The PVDF/C–Ti membrane was also applied for lignin separation, where the rejection to sodium lignin sulfonate was maintained at about 75%, and the flux recovery ratio after UV irradiation reached 90%. The demonstrated the advantages of PVDF/C–Ti membrane in photocatalytic degradation and antifouling performance.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Green Chemical Engineering
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2020
·
IF 0
Qingping Xin,Kaiqiang Xie,Qingqing Liang,Xu Li,Yinan Zeng,Yuhang Zhao,Lei Zhang,Shaofei Wang,Hong Li,Yuzhong Zhang
In membrane contactors, maintaining a high SO 2 absorption flux and an excellent wetting resistance are crucial for hazardous gas removal. In this study, we adopted an electrospinning strategy to fabricate highly robust superhydrophobic dual-layer Elec-PVDF/SiO 2 composite membrane contactors used for flue gas desulfurization. The composite membrane contactor consisted of a durable and ultrathin three-dimensional (3D) superhydrophobic surface and a porous supporting layer, where the formulation was optimized by regulating the PVDF concentration, solvent ratio and SiO 2 particles content in electrospinning solution. The scanning electronic microscopy (SEM), EDS-mapping, water contact angle (WCA) and surface roughness of as-prepared Elec-PVDF/SiO 2 composite membrane contactors were conducted to explore the physical and chemical structure. The SiO 2 nanoparticles were uniformly loaded in Elec-PVDF/SiO 2 composite membrane contactor, and constructed micro-nano dual-coarse lotus-leaf-like morphology, which noticeably elevated surface roughness ( R a ). The SiO 2 nanoparticles also functioned as hydrophobic modifiers, which boosted the WAC up to 155°. The SO 2 absorption fluxes and SO 2 removal efficiencies were investigated. In particular, the membrane contactor doped with 20 wt% SiO 2 nanoparticles significantly elevated the stability of desulfurization performance. Besides, the membrane mass transfer coefficient ( K m ) and corresponding membrane mass transfer resistance ( H / K m ) were explored.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Qin Liu,Yan Wang,Zhi Guo,Siyuan Wu,Wancheng Li,Chuanrun Li,Bo Wu
One of the main challenges in oil–water separation of traditional Chinese medicines (TCM) is to obtain essential oils from the aromatic water of TCM. In this study, silicon dioxide/polyvinylidene fluoride (SiO 2 /PVDF) membranes were prepared using nonsolvent induce phase separation. Then polydimethylsiloxane (PDMS) was coated to obtain PDMS/SiO 2 /PVDF membranes. Separated essential oils and water from aromatic water in the gaseous state by vapor permeation membrane separation technology. The relationship between membrane structure and membrane separation effect was investigated. Response surface methodology was used to develop a quadratic model for the separation factor, membrane permeation separation index and membrane preparation process. The optimal process parameters for the membrane separation were 12.31% (mass) concentration of PVDF solution, 9.6% (mass) of N,N -dimethylacetamide in the solidification bath, and 0.2 g hydrophobic nano-SiO 2 incorporation, with a separation factor of 14.45, and a membrane flux of 1203.04 g·m –2 ·h –1 . Compared with the PDMS/PVDF membranes, the separation factor and membrane flux were increased by 68.59% and 3.46%, respectively. Compared with the SiO 2 /PVDF membranes, the separation factor and membrane flux were increased by 478% and 79.33%, respectively. Effectively mitigated the limitations of traditional polymer membrane material performance affected by the “trade-off” effect. Attenuated total internal reflection-Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy and energy dispersive spectroscopy were used to characterize the PDMS/SiO 2 /PVDF membranes, and gas chromatography was used to characterize the permeate. In addition, the contents of L -menthol, L -menthone, menthyl acetate and limonene in the permeate, conformed to the European Pharmacopoeia standards . This study provided an effective preparation strategy of a feasible hydrophobic powder polymer membrane for the separation of essential oils from gaseous peppermint aromatic water.
研究领域:
材料科学
·
中药学
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Environmental Science
·
2023
·
IF 4.6
Zhang Meilin,Li Shaofeng,Sun Jian,Sun Jianping,Wang Lei,Zhao Rui
To reduce the hazard of sulfamethoxazole (SMX) to the water ecology, the removal mechanism of SMX in wastewater was revealed. This study evaluated the PVDF/DA modified membrane in the membrane bioreactor (MBR) toward the removal and degradation of SMX as a recalcitrant micropollutant. A strategy of dopamine for surface modification of polyvinylidene fluoride (PVDF) membrane was proposed, and PVDF/DA membrane was prepared. Subsequently, PVDF/DA was run in the MBR for 60 days, and the reactor could produce good removal ability for SMX after certain acclimation. When the SMX concentration increased from 0.5 to 2 mg/L, liquid chromatography was used for analysis, and the results showed that the average removal rate was above 85%. The removal effect of COD and NH4+-N and the degree of membrane fouling were also evaluated. By measuring the extracellular polymer (EPS) content, the results showed that after 30 days of operation, the protein and polysaccharide contents in the cake layer on the surface of the PVDF membrane were 1.35 times and 1.49 times that of PVDF/DA membrane, respectively, and the PVDF/DA membrane could alleviate membrane fouling, thereby improving the service life of the membrane and reducing its operating cost. Finally, degradation by-products are evaluated to achieve deeper insight into the degradation mechanisms in the MBR process.
研究领域:
环境科学
·
污水处理
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Junwang Liu,Mingting Zhang,Lizhu Guan,Chunfeng Wang,Lei Shi,Yi Jin,Chao Han,Jihua Wang,Zhidong Han
The composite system composed of polymer, conductive and dielectric filler has excellent dielectric properties. Herein, by studying the effect of filler distribution on the composite system's performance, the graphene nanoplatelets/Polystyrene (GNP/PS)/Barium titanate/Polyvinylidene Fluoride (BT/PVDF) selective composite system is prepared. When the conductivity and dielectric loss change little, the dielectric constant and breakdown field strength of the selective composite system are improved obviously. In the selective composite system, as the dielectric constant is between 12 and 13, the characteristic breakdown field strength is as high as 25.8 kV/mm, which is over three times higher than it of the pure composite system. It is because the addition of BT and GNP particles enhances the establishment of polarization. Besides, the blending of PVDF and PS improves the breakdown field strength of the material. Comprehensive properties of the material are enhanced. Therefore, this study provides a basis for the subsequent study of dielectric materials.
研究领域:
材料科学
·
电气工程
✓ 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）