LANGMUIR
·
2024
·
IF 3.7
Hanbing Zhu,Yi Song,Haowen Qing,Mengying Liu,Yanning Zhao,Mingbo Wu,Zhaoxuan Feng
Oil spills and industrial oily wastewater pose serious threats to the environment. A series of modified membranes with special wettability have been widely used for separating oil/water mixtures and emulsions. However, these membranes still face challenges such as the detachment of the modified coatings and membrane fouling. Here, a freestanding biobased superwetting nanofibrous membrane for oil/water mixture separation was electrospun with chitosan (CS) and poly(vinyl alcohol) (PVA) as precursors, followed by chemical cross-linking and in situ growth of β-FeOOH nanoparticles on the surface. Moreover, by precisely controlling both the cross-linking time between CS and PVA and the growth time of β-FeOOH nanoparticles, the nanosize apertures and rough structures on the membrane surface can be regulated toward a wide range of oil/water separation scenarios. As a result, FeOOH@CS/PVA-4–12 demonstrated superwettability, with a water contact angle of 9.5 ± 3.5° in air and an underwater–oil contact angle above 140°, achieving a separation efficiency of 98.5% and a water permeation flux of 2350 L·m–2·h–1 for n-heptane/water mixtures. The membrane FeOOH@CS/PVA-24–24 exhibited exceptional oil-in-water emulsion separation performance with a separation efficiency of up to 99.9% for water/n-heptane emulsions. Additionally, the membrane exhibited remarkable antifouling properties, attributed to its superwetting surface and the photocatalytic ability of β-FeOOH nanoparticles. After five photocatalytic self-cleaning cycles, the water permeation flux and separation efficiency remained almost unchanged, demonstrating its great potential for practical application.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Tao Wu,Shiyu Zhang,Miaomiao Zhang,Mengying Long,Guangzhe Wang,Tianrun Gu,Hao Deng,Cuiting Ding,Runnan Zhang,Zhongyi Jiang
When introducing acid groups in the diamine monomer for the fabrication of polyamide (PA) membranes through interfacial polymerization (IP), the acid groups not only reduce the diffusion flux of diamine monomer for the polymerization to prepare ultrathin membrane but also provide the negative charges on the membrane surface . However, the introduction of acid groups often weakens the reactivity of diamine monomers, resulting in the formation of thick and loose PA membranes with low rejection of ions. This study proposes a strategy of modulating the IP process of piperazine-2-carboxylic acid (CPIP) by employing an acid acceptor (NaOH) to prepare thin nanofiltration membranes . The acid acceptor can neutralize the HCl to prevent CPIP from being protonated during the IP process, thereby facilitating the cross-linking reaction rate. The thickness of the resulting membrane decreases from 180 nm to 30 nm, accompanied by the fortification of the negative charge, an increase in cross-linking density, and a reduction in pore size. The resulting PA-AA/CPIP_1.0 membrane exhibits a water permeance of 44.6 L m −2 h −1 bar −1 , with a significantly increased Na 2 SO 4 rejection of 98.4 % compared with 50.4 % of the PA-AA/CPIP_0 membrane fabricated without acid acceptor. This work may open a new avenue to fabricating high-performance PA membranes for nanofiltration .
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Liang He,Yang Chen,Xiaoming Shao,Qiyuan Yao,Ding Feng,Lijie Yin,Wencai Wang
To resist the plastic deformation of polymer particles during hot press molding, high molecular weights, and moduli are required for composites with segregated structures, thus the prepared composites exhibit poor flexibility. Also, larger particle sizes can bring lower percolation thresholds while the ensuing greater deformation destroys the conductive network. Moreover, segregated composites still face preparation complexities. Herein, a facile method for developing flexible composites with large-size segregated structures is proposed. First, silver-coated polydopamine-modified reduced graphene oxide (Ag@PrGO), as conductive fillers, is prepared by electroless plating. Next, polydimethylsiloxane (PDMS)-coated polyolefin elastomer (POE) beads are put into a bag containing the fillers. After a simple shaking, the fillers are adhered to the POE surface as the cohesive property of cured PDMS. Finally, flexible composites with large-size segregated structures are obtained via hot pressing. Benefiting from the 2D structure of the Ag@PrGO and the ability to slip, the conductive networks possess adaptable deformability. The prepared composites exhibit excellent electrical conductivity (203.55 S cm −1 ) at filler volume fractions of 3.4 vol%. The EMI shielding effectiveness can reach 70 dB in the X-band at a thickness of 1.9 mm and remains stable after bending and rubbing damage. This work paves the way for constructing large-size segregated structures.
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ANALYST
·
2024
·Vol. 149
·期 5
·1579-1585
·
IF 3.6
Boxin Chen,Yuchen Zhu,Shaojie Ma,Bin Zhao,Fei Feng
A semi-packed gas chromatographic column has the advantages of high specific surface area and low column pressure. We report that the stagnation regions formed in the adjacent posts along the channel of the semi-packed columns can decrease the area and height of chromatographic peaks, which makes it difficult to detect low-concentration mixed gases. A semi-packed column with staggered elliptic cylindrical post arrays (SC-S) made using a micro-electro-mechanical system technique is presented, and the separation performance of SC-S is compared with that of a semi-packed column with aligned elliptic cylindrical post arrays (SC-A). The simulation results show that the width of stagnation regions in SC-S is 86.89% smaller than that in SC-A. The experimental results indicate that the area and height of chromatographic peaks increased as stagnation regions reduced. In the separation of the alkane mixture from C8 through C10 with 10 ppm concentration, the chromatographic peak of decane was hardly identified in SC-A while the chromatographic peak in SC-S was still clearly visible. The chromatographic peak heights of octane and nonane were increased by 65.06% and 130.00%, respectively, in SC-S. The peak areas of octane and nonane were increased by 120.45% and 168.18%, respectively.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Xiaoxia Ye,Xiaoying Lin,Ruiyang Chi,Juan Liu,Jian Huang,Jie Chen
Separating anionic surfactant-stabilized oil-in-water emulsions remains a critical challenge due to the presence of surfactants. In this study, we developed a unique collagen fiber-based CFM-PEI-TiO 2 with superhydrophilic and underwater superoleophobic properties, enabling efficient separation of various anionic surfactant-stabilized oil-in-water microemulsions and nanoemulsions through charge demulsification effects. The membrane achieved high separation flux (1458.50 L·m −2 ·h −1 ) and separation efficiency (99.94%) simultaneously. Importantly, the membrane exhibited remarkable mechanical durability, as it remained capable of separating diverse oil-in-water emulsions even after being subjected to abrasion with sandpaper for 500 cycles, highlighting its long-term durability and economic viability. The robust membrane also demonstrated excellent recyclability , with a separation efficiency of over 99% after twelve cycles and a flux of 1299.10 L·m −2 ·h −1 after fifteen cycles. These properties can be attributed to the PEI-induced electrostatic interactions and the enhanced superhydrophilic-superoleophobic interaction provided by TiO 2 on the unique collagen fiber membrane. The outcomes emphasize the versatility and potential of our membrane in overcoming the challenges associated with emulsified oily wastewater.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Meng Xianghe,Wang Shuyi,Lu Yuanchao,Nie Xiaohua,Ye Qin
Sciadonic acid (△5,11,14–20:3, SCA) is a rare versatile non-methylene-interrupted polyunsaturated fatty acid. To prepare high purity SCA from Torreya oils with 8.04 % purity, Ag + -assisted high-speed countercurrent chromatography (HSCCC) combined with urea complexation (UC) or argentation column chromatography (CC) was investigated. Results showed that n -hexane: acetonitrile (1:1, v/v) was suitable mobile phase for HSCCC, and SCA with purity of 23.74 % and recovery of 61.74 % (SCA purity>20 %) were obtained. When the Ag + addition was 0.50 %, one round of Ag + -HSCCC resulted in a recovery of SCA up to 95.38 % with purity around 21 %. It was believed that the enhanced performance originated from the reversible complexes between Ag + and C C in SCA through π-s * and d-π* bonds. Starting with low purity SCA of 8.04 %, HSCCC (23.74 %), UC (62.67 %), or Ag + -CC (60.41 % ) alone failed to produce SCA with high-purity (>90 %). However, Ag + -HSCCC combined with Ag + -UC or Ag + -CC yielded SCA with purities of 76.21 % and 97.74 %, and overall recovery of 21.38 % and 19.31 %, respectively. Thus, Ag + -HSCCC was an efficient method for the pre-enrichment of SCA, which could effectively facilitate coupling with UC, Ag + -CC or other PUFA purification techniques, resulted in significant improved purification performances.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Yuanzheng Cai,Lingling Cao,Hongmei Cai,Wenqi Yang,Hongjie Lu,Abulaite Adila,Baolin Zhang,Yang Cao,Weihong Huang,Wanzhen Xu,Wenming Yang
In recent years, the widespread use of sulfonamide antibiotics has led to increasing concerns over antibiotic residues. To address the challenges, this study developed a rapid and highly sensitive detection method based on ratiometric fluorescence. By employing nitrogen-doped carbon quantum dots (N-BCDs) and biomass-derived carbon quantum dots (RCDs), single-channel and ratiometric fluorescence sensors were constructed. The incorporation of molecularly imprinted polymers (MIPs) enhanced the specificity and sensitivity of target recognition. Experimental results demonstrated that the ratiometric fluorescence sensor exhibited superior anti-interference capability and detection stability compared to the single-channel sensor, achieving a detection limit as low as 10.41 nM, significantly outperforming the single-channel sensor's limit of 25.94 nM. To enable rapid on-site detection, the ratiometric fluorescence sensor was integrated with a microfluidic paper-based chip, resulting in a visual detection platform. Moreover, a microfluidic paper-based chip with a spatially rotational structure was developed, integrating smartphone photo-recognition functionality to convert fluorescence ratio changes into RGB values, enabling rapid visual detection of SDZ. In practical applications involving milk and water samples, the sensor achieved recovery rates between 98.70 % and 108.70 %, demonstrating excellent performance. This ratiometric fluorescence microfluidic paper-based chip sensor offers simplicity, high sensitivity, and strong selectivity, making it suitable for non-professional users to perform rapid on-site detection. It shows great potential for applications in food safety and environmental monitoring.
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COMBUSTION AND FLAME
·
2012
·
IF 3.585
Olivier Herbinet,Benoit Husson,Zeynep Serinyel,Maximilien Cord,Valérie Warth,René Fournet,Pierre-Alexandre Glaude,Baptiste Sirjean,Frédérique Battin-Leclerc,Zhandong Wang,Mingfeng Xie,Zhanjun Cheng,Fei Qi
The low-temperature oxidation of n -heptane, one of the reference species for the octane rating of gasoline, was investigated using a jet-stirred reactor and two methods of analysis: gas chromatography and synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS) with direct sampling through a molecular jet. The second method allowed the identification of products, such as molecules with hydroperoxy functions, that are not stable enough to be detected using gas chromatography. Mole fractions of the reactants and reaction products were measured as a function of temperature (500–1100 K), at a residence time of 2 s, at a pressure of 800 Torr (1.06 bar) and under stoichiometric conditions. The fuel was diluted in an inert gas (fuel inlet mole fraction of 0.005). Attention was paid to the formation of reaction products involved in the low-temperature oxidation of n -heptane, such as olefins , cyclic ethers, aldehydes, ketones, species with two carbonyl groups (diones), and ketohydroperoxides. Diones and ketohydroperoxides are important intermediates in the low-temperature oxidation of n -alkanes, but their formation have rarely been reported. Significant amounts of organic acids (acetic and propanoic acids) were also observed at low temperatures. The comparison of experimental data and profiles computed using an automatically generated detailed kinetic model is satisfactory overall. A route for the formation of acetic and propanoic acids was proposed. Quantum calculations were performed to refine the consumption routes of ketohydroperoxides toward diones.
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TALANTA
·
2012
·
IF 3.794
Lin Fan,Xiu-Ping Yan
Isostructural metal–organic frameworks (MOFs) MIL-100(Fe) and MIL-100(Cr), which have identical organic linker and Mobil Thirty-Nine zeolitic type, but different metal ions , were exploited as stationary phases for capillary gas chromatographic separation of alkane isomers. MIL-100(Fe) coated capillary column showed great capability and high efficiency for the gas chromatographic separation of alkane isomers without the need of temperature-programming, while MIL-100(Cr) coated capillary column gave poor performance for the separation. The separation performance of MIL-100(Fe) coated capillary column was even better than commercial HP-5MS and GS-GasPro capillary columns. The determined McReynolds constants, adsorption enthalpies and entropies showed that MIL-100(Fe) coated capillary column gave relatively weaker interaction with alkane isomers than MIL-100(Cr) coated capillary column. The relative standard deviations of repeatability for C7 alkane isomers on MIL-100(Fe) coated capillary column were 0.06–0.16%, 1.1–1.5%, 2.8–3.0% and 2.1–2.4% for retention time, half peak width, peak height and peak area, respectively.
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TALANTA
·
2025
·
IF 6.1
Zhenwu Liang,Yuelian Qin,Xinyu Zhong,Xiaolong Ma,Lijun Deng,Ziwei Zou,Linlin Feng,Ziping Pan,Shihan Pan,Mei Li,Zhiheng Su,Jinxia Wu
Here, a smartphone-integrated paper-based colorimetric sensor array (PBCSA) was developed for distinguishing flavonoid-rich Citrus herbal products (FRCHPs): Citri reticulatae pericarpium , Aurantii fructus immaturus , Aurantii fructus , Citri grandis exocarpium , Citri reticulatae pericarpium viride , and Citri sarcodactylis fructus . Based on the strategy of indicator displacement assay induced by flavonoids, a 3 × 3 PBCSA with a hydrophobic barrier was constructed using inkjet printing technology. The PBCSA can accurately distinguished different species or concentrations flavonoids, and FRCHPs, demonstrating its broad applicability. After optimization with Genetic Algorithm, the Support Vector Machine (SVM) reduced the number of PBCSA sensor units from nine to five while maintaining an accuracy of 100.00 %, significantly improving the efficiency and accuracy of detection. Furthermore, the optimized SVM was integrated into a self-developed Quick Viewer app for real-time detection, greatly enhancing its practicability. This study not only presents a novel strategy for optimizing sensor arrays but also introduces a simple, economical, and real-time approach for analyzing FRCHPs.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Tianwei Huo,Feiran Li,Jian Wang,Yunlu Pan,Xuezeng Zhao,Bharat Bhushan
Superoleophobic-superhydrophilic surfaces have been used for applications in the fabrication of antioil-fouling smart textiles and for immiscible oil–water mixtures and emulsions separation. Typically, these surfaces are constructed by depositing coatings with selective superwetting properties on porous structures. The facile electrospun technique involves the deposition of polymer solutions or melts through an electric field, resulting in nanometer-sized fibers that form nanofibrous membranes with hierarchical structures and a large specific surface area. In this study, superoleophobic-superhydrophilic nanofibrous membranes were prepared by blending perfluorooctanoic acid and polyacrylonitrile polymers and fluorinated TiO2 nanoparticles and electrospinning them. The prepared nanofibrous membranes exhibit superoleophobic and superhydrophilic properties, along with antioil-fouling characteristics. These membranes can separate immiscible oil–water mixtures and oil-in-water emulsions. This superoleophobic-superhydrophilic nanofibrous membranes have broad applications in industry and for environmental protection.
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Small
·
2025
·
IF 12.1
Xue Yin,Jia Chen,Xin Li,Qifang He,Junping Zhang,Yang Shu,Jianhua Wang,Banglin Chen,Hongdeng Qiu
In this work, a novel 1D metal-mediated hydrogen-bonded framework with rich phenyl groups is first synthesized employing Co 2+ and dibenzoylmethane (DBM) as precursors, which are named HOF-Co-DBM and exhibit exceptional thermal stability, excellent chemical durability, and super hydrophobicity. These distinctive properties can be attributed to the high density, robust Co─O coordination bonds, and the presence of strong hydrogen bonds (O─H─O─C) characterized by short bond distances, which contribute to its close-packed structure. Additionally, the benzene rings flanking the framework further enhance its hydrophobicity. The HOF-Co-DBM is subsequently integrated into a polyurethane (PU) sponge, resulting in exceptional oil removal performance. This study demonstrates the potential for preparing ultra-stable and superhydrophobic hydrogen-bonded organic framework materials with a wide range of applications.
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危险品化学品经营许可证（带存储）