Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Wei Luan,Chengyu Nie,Xianfu Chen,Zhenchen Tang,Minghui Qiu,Yiqun Fan
Ceramic membranes have been widely used in oil-water separation owing to their characteristics of high flux, excellent chemical stability, strong hydrophilicity, and good fouling resistance. To further enhance their anti-fouling performance, a co-deposition reaction was employed for the surface modification of the ceramic membranes in this study. Polyethyleneimine and dopamine were used to introduce tertiary amine groups on the surface of the ceramic membranes, and sodium 2-bromoethanesulfonate was used for the quaternization reaction with tertiary amine groups. According to the water contact angle measurements, the ceramic membrane functionalized via zwitterionic modification exhibited better hydrophilicity and thus could absorb water droplets faster than pristine ceramic membranes. Consequently, the zwitterion-functionalized ceramic membrane achieved double the permeance (40 L m −2 h −1 bar -1 ) compared to the original ceramic membrane (20 L m −2 h −1 bar -1 ) during the separation of the oil-in-water emulsion, suggesting good anti-fouling performance.
研究领域:
材料科学
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化学工程
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环境工程
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DOI
高影响因子
Results in Engineering
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2024
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IF 6
Ziteng Feng,Tong Wang,Yakai Lin,Lin Wang,Yuanhui Tang,Huanhuan Wu,Hedi Chen,Lixin Yu,Xiaolin Wang
Polyvinylidene fluoride (PVDF) membranes, widely used for their stability, face limitations due to the hardly adjustable pore size in nanoscale and inherent hydrophobicity. To address this, we proposed a co-deposition method incorporating dopamine (DA), polyethyleneimine (PEI), and silicon dioxide (SiO 2 ) nanoparticles with glutaraldehyde cross-linking for precise regulation of pore size and hydrophilicity in PVDF hollow fiber membranes. Notably, the pore diameter reduced from 119.0 ± 3.55 nm to 18.4 ± 0.36 nm, while the contact angle decreased from 107.7° to 40.9°. This simultaneous regulation led to a high-performance PDA/PEI/SiO 2 -PVDF hydrophilic ultrafiltration membrane with a rejection rate exceeding 99% for 20 nm nanoparticles in a long-term simulated separation experiment while achieving a significant protein permeability of 97% in BSA permeation experiments. Additionally, the membrane demonstrated exceptional long-term stability, offering a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.
研究领域:
材料科学
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环境工程
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生物医学工程
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产品关联
DOI
高影响因子
Materials
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2022
·Vol. 15
·期 6
·2039
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IF 3.748
Yueqi Zhang,Bin Du,Yuting Wu,Zhiwei Liu,Jiang Wang,Jianjie Xu,Zhaoyang Tong,Xihui Mu,Bing Liu
Bacterial infection is a significant cause of morbidity and mortality to humans worldwide. Thus, a method for nonspecific, sensitive, and rapid enrichment of such bacteria is essential for bacteria detection and treatment. This study demonstrates a self-made core-shell Fe3O4@Polydopamine@Polyethyleneimine magnetic beads (Fe3O4@PDA@PEI MBs) with a high density positive charge-based magnetic separation scheme for the broad-spectrum rapid enrichment of microorganisms in the liquid phase. MBs with a high-density positive charge have a strong electrostatic attraction to most microorganisms in nature. Our scheme is as follows: (1) wrapping dopamine (DA) on the iron oxide through self-polymerization and wrapping PEI on the outermost shell layer in a mode of crosslinking with the PDA; (2) subsequently, the Fe3O4@PDA@PEI MBs were used to concentrate microorganisms from the sample solution; (3) performing magnetic separation and calculating the adsorption efficiency. The as-prepared Fe3O4@PDA@PEI MBs composite was carefully characterized by zeta potential analysis, Value stream-mapping (VSM), transmission electron microscopy (TEM), and Fourier transforms infrared spectrometry (FT-IR). In this study, both gram-positive and gram-negative bacteria could be captured in three minutes through electrostatic interaction. Furthermore, the adsorption efficiency on gram-negative (>98%) is higher than that on gram-positive (>95%), allowing for a simple, rapid assay to enrich organisms in resource-limited settings.Keywords:magnetic beads;bacterial enrichment;magnetic separation;electrostatic interaction
研究领域:
微生物学
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医学工程
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2023
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IF 6.1
Qing Li,Yu-Meng Guo,Xiang-Yi He,Guang-Li Li
The reliable and accurate detection of glyphosate is urgently demanded because it is related to food and environmental safety. In this contribution, a PDA-PEI/Cu 2+ complex that possesses peroxidase-mimetic activity and stimulus-responsive fluorescence was fabricated by coordinating Cu 2+ with polydopamine-polyethyleneimine copolymer dots (PDA-PEI CPDs). With the introduction of Cu 2+ , the fluorescence intensity of PDA-PEI CPDs dropped sharply owing to the electron transfer effect. As a peroxidase-mimicking nanozyme , the PDA-PEI/Cu 2+ complex owns catalytic capacity to oxidize the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxTMB, leading a further fluorescence quenching by internal filtering effect by oxTMB. Once the glyphosate participated, the fluorescence signal of PDA-PEI CPDs is recovered significantly because of the formation of more stable Glyp-Cu 2+ complexes, meanwhile the peroxidase-mimicking activity of PDA-PEI/Cu 2+ complex could be strongly hindered. According to this principle, a novel and extremely convenient ‘turn off’ colorimetric and ‘turn on’ fluorescence sensing platform can be established for dual-mode detection of glyphosate. The favorable sensitivity and selectivity and were verified in the analysis of glyphosate in the environment through the marriage of dual-signal sensing platform. The detection limit of the dual-mode glyphosate sensing platform was 103.82 ng/mL for colorimetric assay and 16.87 ng/mL for fluorescent assay, respectively. Satisfactory recoveries in the range of 96.40%–104.66% were obtained, indicating the potential of this method for application in complicated real sample. Thereby, this strategy broadens the applications of polydopamine nanomaterials and holds a promising application in determination of pesticide residues .
研究领域:
环境科学
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分析化学
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纳米材料科学
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DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
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IF 6.9
Shan Huang,Xiaoliang Fang,Yanguo Yin,Wei Liu,Qi Chen,Xiaozeng Guo
Aramid particles (AP) and polytetrafluoroethylene (PTFE) impart tribological application potential to AP/PTFE composites, but weak interfacial bonding and poor formation of high-quality transfer films hinder performance enhancement. In this study, AP was surface-functionalized using a simple, mild, eco-friendly polydopamine (PDA)-polyethylenimine (PEI) synergistic strategy to fabricate AP-PDA-PEI/PTFE composites. Systematic investigations were conducted on their microscopic mechanical properties, tensile strength, tribological performance, and underlying mechanisms. Results indicate that PDA-PEI modification enhances the interfacial microscopic mechanical properties between AP and PTFE. Compared to AP/PTFE, the modified composite’s interfacial modulus is increased by 89.67%. AP 10 -PDA-PEI/PTFE exhibits a tensile strength of 35 MPa, 59.1% higher than AP 10 /PTFE. Characterizations of interfacial microtopography and elemental distribution confirm enhanced interfacial bonding. At 3 MPa, 6.5 MPa, and 10 MPa, AP 10 /PTFE has average friction coefficients of 0.185, 0.157, and 0.150, respectively, with wear rates of ~10 -6 mm 3 /(N·m). In contrast, AP 10 -PDA-PEI/PTFE shows optimal tribological performance: its average friction coefficients are reduced by 15.1%, 12.0%, and 30.2%, with wear rate decreased to ~10 -7 mm 3 /(N·m) (one order of magnitude lower than unmodified AP 10 /PTFE). Wear scar and transfer film characterizations reveal that the composite’s excellent performance stems from the synergy of optimized interfacial bonding and transfer film formation. Enhanced interfacial bonding inhibits AP debonding, while transfer film formation facilitates tribochemical reactions. This transforms the sliding contact mode to tribofilm-transfer film contact, achieving stable, low-wear lubrication.
研究领域:
材料科学
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摩擦学
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聚合物复合材料
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表面工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Luyu Wang,Jin Xu,Xiaohong Wang,Zhixuan Cheng,Jiaqiang Xu
Although many humidity sensing materials have satisfactory properties based on quartz crystal microbalance (QCM) transducer, their synthesis processes are complex. Herein, we report an effective and facile method to modify porous polypropylene microfiltration membrane (PPMM) evenly via the deposition of N-rich functional polymer (PDA-PEI), which was easily synthesized by crosslinking polydopamine (PDA) and polyethyleneimine (PEI). The PDA-PEI modified PPMM well retained the pore structure and was first employed to detect relative humidity based on QCM featured with rapid response, satisfactory repeatability and stability. Compared with PDA modified PPMM, the humidity sensing performance of PDA-PEI modified PPMM is improved considerably. Furthermore, the sensing mechanism study based on Gaussian 09 software reveals that the interaction between PDA-PEI and water molecules belongs to weak chemical adsorption. Such a comprehensive research foresees the potential application of PDA-PEI modified PPMM for fast detection of humidity indoor and outdoor.
研究领域:
材料科学
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化学工程
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传感器与执行器
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）