JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Ze-Lin Qiu,Wen-Han Yu,Yu-Jie Shen,Bao-Ku Zhu,Li-Feng Fang
High-efficient separation of molecules is of great significance in food, biotechnology, pharmaceutical and dairy industries. To this end, cationic hyperbranched poly (amido-amine)s (HBPs) with different numbers of quaternary ammonium groups were employed as a new kind of 3D spherical macromonomers to fabricate nanofiltration (NF) membranes, through interfacial polymerization (IP) between cationic HBPs and trimesoyl chloride (TMC) on a polyvinyl chloride ultrafiltration (PVC-UF) hollow fiber membrane surface. Apart from the inner voids inside cationic HBP molecules for fast transport of water molecules, sizes and charge properties of the outer voids between cationic HBP molecules can be modulated by changing the numbers of quaternary ammonium groups on cationic HBP molecule surfaces for enhancing both high permeability and selectivity (water permeance and MgCl 2 rejection rate of the resultant NF membrane are up to 310.5 L m −2 h −1 MPa −1 and 92.0% respectively). Based on the separation mechanism of combined steric and Donnan effects, the resultant NF membrane exhibits ultrahigh retentions to molecules with high molecular weights (MWs) or positive charges, thus molecular-level selectivity to VB12/VB2 (neutral molecules with distinct MWs) or VB1/VB2 (cationic/neutral molecules with similar MWs) can be achieved.
研究领域:
化学工程
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材料科学
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膜技术
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生物技术
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药学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xin Zhang,Langyue Pan,Aimin Liu,Zhongning Shi
The effect of the AlCl 3 content on the solubility, conductivity, ionic structure, and electrochemical behavior of Al in the 1,3-Dimethyl-2-imidazolidinone-aluminum chloride (DMI-AlCl 3 ) electrolyte system was studied. The results indicate that when the molar ratio of AlCl 3 to DMI is less than 1.0, there are anions [AlCl 4 ] − , cations [AlCl 2 (DMI) 4 ] + , and neutral molecules [AlCl 3 (DMI) 2 ] in the system. When the molar ratio is greater than 1.0, [AlCl 4 ] − will react with AlCl 3 and form [Al 2 Cl 7 ] − . As the molar ratio increases, the conductivity of the system gradually decreases, the concentration of [Al 2 Cl 7 ] − ion increases and under the same conditions, the electrodeposited products increase. After adding MgCl 2 in the DMI-AlCl 3 ( x = 1.6) system, the structure of aluminum ions in the system will change, and magnesium exists in the form of [MgCl(DMI) 4 ] + . The cyclic voltammetry and square wave voltammetry results show that the electrochemical reduction of aluminum and magnesium is controlled by diffusion. The XRD and XPS results indicate that magnesium exists in the form of Al 12 Mg 17 in the deposits, with a content of approximately 6.4 wt%.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Dongmei Han,Xibo He,Yicheng Hou,Boxi Geng,Hao Zhang,Bachirou Guene Lougou,Yong Shuai
While thermal energy storage (TES) systems are becoming crucial to the stable operation of solar power plants, molten salt packed bed thermal energy storage (PBTES) systems attracted widespread attention due to their wide operating temperature range and low cost. However, achieving high-efficiency thermal storage systems is still a datum challenge to meet the higher energy demand, as well as sustainable development and utilization of renewable energy systems. This study developed spherical capsules employing nanocomposite salts (MgCl 2 –KCl–NaCl/Al 2 O 3 nanoparticles) as composite phase change materials to experimentally study the heat storage process of a high-temperature PBTES prototype experimental system. Also, the heat storage performance of the PBTES system under different operating conditions is further investigated. The results showed that the nanocomposite salt gradually melted along the flow direction of the heat transfer fluid by exhibiting three-stage characteristics including solid phase sensible heat, phase change latent heat, and liquid phase sensible heat. Also, the temperature difference inside and outside the capsules showed the characteristics of peak-trough-peak. The PBTES system reached a heat storage density of 1290.51 MJ m −3 at a thermal efficiency of 86.95 %. The average heat storage rate increased by 49.55 % and the heat storage time was shortened by 29.67 % when the blower speed was increased from 800 r·min −1 to 1200 r·min −1 . The experimental results implied that the PBTES system encapsulating nanocomposite salts has excellent thermal performance. This study demonstrated solving the problems of insufficient thermal energy supply in time or space and improving energy utilization could result in a high-efficiency thermal storage system.
研究领域:
能源工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yin-Xin Fang,Zhen-Liang Xu,Sun-Jie Xu
Generally, thin-film composite (TFC) membranes prepared using piperazine (PIP) and trimesoyl chloride (TMC) exhibit good Na 2 SO 4 rejection, but their MgCl 2 rejection is not satisfactory. In this study, a defective covalent organic framework (COF) interlayer with residual unreacted amine groups was fabricated via interfacial polymerization (IP) by changing the catalyst concentration. Introduction of the COF layer into a polyamide (PA) separation membrane modified the pore size of the PA layer, thereby improving the rejection of divalent cations. The pore size of the PA layer decreased and the surface morphology of the membrane was converted from nodular to a hybrid morphology of “ridge-and-valleys’’ and nodules, indicating that the residual unreacted amine groups on the COF interlayer successfully reacted with the acyl chloride groups. The optimal membrane (PIP/COF-A/PES) exhibited high rejection of divalent ions (Na 2 SO 4 of 98.3% and MgCl 2 of 94.3%), and the membrane showed excellent capability for separating mono/divalent ions. Overall, a method of preparing nanofiltration membranes by modifying the PA layer to enhance the rejection of divalent cations was demonstrated.
研究领域:
材料科学
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化学工程
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纳米技术
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Yuehua Zhang,Yi Yang,Peng Xu,Xianfu Chen,Minghui Qiu,Yiqun Fan
Ceramic membranes with multi-channel configurations exhibit superior mechanical strength, high packing density, and high separation efficiency, making them more suitable for industrial applications than single tube and hollow fiber membranes. However, the preparation of thin-film composite (TFC) membranes on multi-channel ceramic supports remains a challenge because of the poor compatibility between organic and inorganic materials and their special configuration. In this study, nanofiltration membranes with a stabilized structure supported by 19-channel ceramic membranes were successfully prepared with improved adhesion strength and dynamic interfacial polymerization. TFC membranes with different channels exhibited uniform microstructure and stable performance. Specifically, polyethyleneimine, which served as a polymerization reactant, can be tightly wound on the surface of ceramic membranes via hydrogen bonding and van der Waals forces during interfacial polymerization. Owing to the enhanced cross-linked network interactions between the support and separation layers, the adhesion strength was significantly improved. Consequently, the optimized membranes maintained excellent rejection to MgCl 2 of ∼94 % after the back-flush test under the pressure of 4 bar. Additionally, the multi-channel TFC membranes exhibited stable performance, with a pure water permeance of ∼14.9 LMH/bar and a molecular weight cut-off of 450 Da. When filtering sunset yellow for 10 h, the prepared membranes exhibited stable permeance and excellent rejection performance.
研究领域:
材料科学
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化学工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qi Shen,Ding Yu Xing,Feiyun Sun,Wenyi Dong,Fengjiao Zhang
Thin film nanocomposite membranes have become a feasible technology for heavy metal wastewater treatment . However, how to enhance the dispersibility and compatibility of nanomaterials in the selective layer is an important issue to improve the membrane performance of heavy metal removal . In this study, silica-poly(ionic liquid) nanoparticles were incorporated in the selective layer of TFN membranes. 1-Allyl-3-methyl imidazolium hexafluorophosphate ([AMIm]PF 6 ) was selected to modify silica (SiO 2 ) particles. The formed poly([AMIm]+) brushes provided charge properties to enhance dispersibility and organic part to improve compatibility in the polyamide layer of NF membranes. The resultant TFN membranes incorporated with SiO 2 -[AMIm]PF 6 particles exhibited an increment of 34% water permeation and 41.6% MgCl 2 rejection. Moreover, with an average rejection improvement of around 15% for heavy metal ions at pH = 5–6, the SiO 2 -[AMIm]PF 6 /PA membrane showed its superiority beyond the PA membrane. The electropositivity and microporous structure of the SiO 2 -[AMIm]PF 6 particles enhanced their dispersibility and compatibility in the polyamide layer. Meanwhile, the proper pore size and structure of the SiO 2 -[AMIm]PF 6 particles contributed to the channels for water transport and the sieving effect for most heavy metal ions. This work may facilitate the applications of TFN membranes in heavy metal wastewater treatment to alleviate the “trade-off” phenomenon.
研究领域:
环境工程
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材料科学
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水处理
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 5
·737
·
IF 4.7
Jianhao Li,Zihang Shi,Xiankang Fan,Lihui Du,Qiang Xia,Changyu Zhou,Yangying Sun,Baocai Xu,Daodong Pan
The effects of low-sodium salt mixture substitution on the sensory quality, protein oxidation, and hydrolysis of air-dried chicken and its molecular mechanisms were investigated based on tandem mass tagging (TMT) quantitative proteomics. The composite salt formulated with 1.6% KCl, 0.8% MgCl2, and 5.6% NaCl was found to improve the freshness and texture quality scores. Low-sodium salt mixture substitution significantly decreased the carbonyl content (1.52 nmol/mg), surface hydrophobicity (102.58 μg), and dimeric tyrosine content (2.69 A.U.), and significantly increased the sulfhydryl content (74.46 nmol/mg) and tryptophan fluorescence intensity, suggesting that protein oxidation was inhibited. Furthermore, low-sodium salt mixture substitution significantly increased the protein hydrolysis index (0.067), and cathepsin B and L activities (102.13 U/g and 349.25 U/g), suggesting that protein hydrolysis was facilitated. The correlation results showed that changes in the degree of protein hydrolysis and protein oxidation were closely related to sensory quality. TMT quantitative proteomics indicated that the degradation of myosin and titin as well as changes in the activities of the enzymes, CNDP2, DPP7, ABHD12B, FADH2A, and AASS, were responsible for the changes in the taste quality. In addition, CNDP2, ALDH1A1, and NMNAT1 are key enzymes that reduce protein oxidation. Overall, KCl and MgCl2composite salt substitution is an effective method for producing low-sodium air-dried chicken.
研究领域:
食品科学
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蛋白质组学
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感官评价
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2024
·
IF 6.1
Wenhui Lyu,Yuyue Zhang,Shaopei Ding,Xiang Li,Tong Sun,Jun Luo,Jian Wang,Jianshu Li,Lei Li
In bone tissue, nerves are primarily located in the periosteum and play an indispensable role in bone defect repair. However, most bone tissue engineering approaches ignored the reconstruction of the nerve network. Herein, we aimed to develop a bilayer hydrogel simulating periosteum-bone structure to induce innervated bone regeneration. The bottom “bone” layer consisted of gelatin methacryloyl (GelMA), poly (ethylene glycol) diacrylate (PEGDA), and nano-hydroxyapatite (nHA), whereas the upper “periosteum” layer consisted of GelMA, sodium alginate (SA) and MgCl2. The mechanical properties of the upper and bottom hydrogels were designed to be suitable for neurogenesis and osteogenesis, respectively. Besides, Mg2+ from the “periosteum” layer released at the early stage (within 7 d), which aligned with the optimal time window for nerve regeneration and osteogenic related neuropeptide release. Simultaneously, the prevention of long-term Mg2+ release (after 7 d) could avoid osteogenic inhibition caused by prolonged Mg2+ exposure. Additionally, the incorporation of nHA in the bottom “bone” layer supported the long-term osteogenesis due to its osteoconductivity and slow degradation. In vitro biological experiments revealed that the bilayer hydrogel (GS@Mg/GP@nHA) promoted neurite growth and calcitonin gene-related peptide (CGRP) expression in rat dorsal root ganglion (DRG) neurons, as well as the osteogenesis of rat bone-derived mesenchymal stem cells (BMSCs). Moreover, the in vivo experiments demonstrated that GS@Mg/GP@nHA hydrogel efficiently promoted nerve network reconstruction and bone regeneration of rat calvarial bone defects. Altogether, the bilayer hydrogel GS@Mg/GP@nHA could promote innervated bone regeneration, providing new insights for biomaterial designing for bone tissue engineering.
研究领域:
组织工程
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生物材料
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再生医学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2014
·
IF 3.96
Xiuzhen Wei,Songxue Wang,Yingying Shi,Hai Xiang,Jinyuan Chen,Baoku Zhu
A positively charged composite nanofiltration (NF) hollow fiber membrane was prepared by interfacial polymerization with polyethyleneimine (PEI) and trimesoyl chloride (TMC) as the reactive monomers . The preparation conditions were optimized, and a relatively simple preparation process was developed. In the optimized preparation process, Na 3 PO 4 is not needed and the heat-treatment process can be omitted, which saves operation time and reduces cost. The surface morphology and chemical structure of the resulting composite NF membrane were characterized by scanning electron microscopy (SEM), attenuated total reflectance-Fourier transform infrared (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). Pure water flux , contact angle, molecular weight cut-off (MWCO) and surface zeta potential of the composite NF membrane were also evaluated. The rejection of the NF membrane for MgCl 2 (1 g/L aqueous solution at 0.4 MPa) was above 97.0%, and the permeate flux was approximately 35.3 L/m 2 h. Furthermore, the NF membrane also showed excellent rejection performance for different dye molecules. The rejections of the NF membrane to brilliant blue KN-R, cationic red X-GTL, acid red B, rhodamine B and cationic gold yellow X-GL were 99.9%, 99.8%, 98.8%, 97.5% and 96.7%, respectively.
研究领域:
膜科学
·
纳米技术
·
材料科学
·
水处理
✓ 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）