February 2025
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5 Reads
Polymer
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February 2025
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5 Reads
Polymer
December 2024
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17 Reads
Journal of Environmental Chemical Engineering
November 2024
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4 Reads
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2 Citations
ACS Applied Nano Materials
October 2024
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10 Reads
To solve the problem of cytotoxicity for most antimicrobial agents loaded in packaging materials, we developed a novel bi‐layer fibrous membrane by using centrifugal spinning, which of the outer layer was submicron native potato starch/polyvinyl alcohol (ST/PVA) composite fibers loaded with ZnO nanoparticles (ZnO NPs) for providing high antibacterial activity. The inner layer was nano‐based calcium alginate/polyethylene oxide (CA/PEO) fiber for providing excellent biocompatibility. The addition of ZnO caused the semicrystalline structures of ST/PVA fibers, while the CA/PEO fibers were shown semicrystalline structures due to the PEO. Fourier transform infrared indicated that posttreatment had not effect on the structures of ST/PVA/ZnO fiber, but the structure of CA/PEO fibers were affected by interaction between COO groups of alginate and Ca²⁺ ions. The results of mechanical property demonstrated that CA/PEO fibers showed highest stress of 3.83 ± 0.25 MPa and helpful for improving the stress of bi‐layer fibrous membrane. The obtained fibrous membrane had excellent antibacterial property with diameters of bacteriostatic zone against E. coli and S. aureus of 20.5 and 21.5 mm, respectively. On this basis, the shelf life of strawberry was improved up to 6th day by inhibit the growth of microorganisms, which indicated that the obtained fibrous membrane showed great potential for food packaging.
October 2024
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7 Reads
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1 Citation
ACS Applied Polymer Materials
October 2024
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4 Citations
Separation and Purification Technology
July 2024
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7 Reads
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2 Citations
Fibers and Polymers
Centrifugal spinning has demonstrated to be one of the effective techniques for the preparation of micro-/nanofibers. It is utilizing centrifugal force to extrude polymer solution/melt out of the nozzle and form a serious of stretching jets. Then, the micro-/nanofibers were formed after the evaporation of the solvent or drop down of jet temperature during jets stretching process. In the process, the structure of spinneret and the flow field of gas outside of spinneret has a great influence on fiber formation and quality. Therefore, the motion mechanism of spinning fluid in spinnerets and nozzles with different structures is studied in this paper. Based on the experimental analysis of fiber spinnability, the motion equation and wave equation of polymer jet in space Cartesian coordinate system are derived, and the two-dimensional flow field of polymer solution is analyzed. Through the simulation of the motion mechanism of the solution in different nozzles and the gas flow field outside different spinnerets, the optimal structure of the spinnerets and nozzles is determined. In addition, the effects of solution properties, rotation speed and nozzle diameter on the fiber morphology are analyzed. Results showed that spinneret of nozzle-free expressed more uniform flow field and were suitable for the preparation of highly oriented micro-/nanofibers. The spinneret with nozzles presented a more turbulent flow field, while fibers with smaller diameters and more uniform distribution could be obtained. The structure of nozzle had a greatly influence on fiber diameters, distribution of fiber diameters, and fiber morphology.
July 2024
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19 Reads
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15 Citations
Chemical Engineering Journal
July 2024
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7 Reads
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1 Citation
Applied Surface Science
February 2022
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37 Reads
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24 Citations
Separation and Purification Technology
Single-use polystyrene impose an enormous environmental threat, but their recycling has been proven challenging. Chemical conversion is the most versatile and robust approach to combat polystyrene waste. Carbon materials adsorbent EPMT was prepared from expanded polystyrene waste and applied to recover Eriochrome Black T (EBT) and Congo red (CR) from aqueous solution. EPMT was characterized by different analytical skills and the outcomes were used to analyze the corresponding adsorption interactions. The maximum adsorption capacity of the adsorbent for EBT and CR were 560.25 and 1010.19 mg/g, respectively. Thermodynamic showed the adsorption was subject to an endothermic spontaneous process. In terms of reusability, the performance of adsorbent was kept in a superior state all the time, and the dyes were recovered in better purity. The adsorbent displayed outstanding elimination competence and realized the separation of different dyes when it was used as padding to equip packed column. In brief, converting waste polystyrene to an adsorbent offers potential for water purification and provides a new route for upcycling of polystyrene into value-added materials.
... The diameter of the fibers decreases with the increasing air pressure. Production in the range of 3.6-50 g/h has been reported [33][34][35]. ...
July 2024
Chemical Engineering Journal
... Instead, it focused on controlling the solvent/nonsolvent system and the concentration of KMnO 4 . Others used waste EPS as adsorbent to recover Eriochrome Black T and Congo Red [10], Crystal Violet [11], and aflatoxins [12]. Siyal et al. also synthesized waste EPS through acetylation of polystyrene followed by condensation with phenyl hydrazine. ...
February 2022
Separation and Purification Technology
... [22] Modified GG has been reported as an adsorbent for heavy metal ions, [23] dyes, [24] and drug delivery. [25] The extraordinary viscosity, gelling ability, or thickening properties of GG are due to the presence of a large number of hydroxyl groups that undergo hydrogen bonding with water molecules, and the result is chain entanglement of galactose unit attached to the side chain of the mannose backbone. [26,27] In the literature, there are reports on the modification of GG for use in different applications. ...
November 2021
Journal of Hazardous Materials
... In particular, benzoates and derivatives enhance polyester dyeing by serving as dye carriers [67,68]. Polystyrenes recovered from waste are converted into dye absorbents by grafting 1,2,4-benzenetricarboxylic anhydride [4] or maleic anhydride [69] through Friedel-Crafts reactions, employing AlCl3 as a catalyst. These graft molecules, which share chemical structures in common with those generated on PE-BA, increase the dye-receptive sites of the polymer. ...
November 2021
... Membrane or nano-filtration can be costly to manufacture, energy-intensive, and require frequent filter replacement due to pore clogging, necessitating pressure for filtration [11][12][13]. Of these methods, adsorption is the most widely used industrially, with ongoing research into various dye adsorbents, including activated carbon [14], lignin-based products [15][16][17], chitosan [18,19], cellulosebased beads [20], Metal-Organic Framework (MOF) [21][22][23][24], and other thermopolymerized composites [25,26]. ...
October 2021
International Journal of Biological Macromolecules
... economic viability and regenerative capacity [63]. To make effluent treatment more economical and reduce environmental impact, the adsorbent should exhibit good reusability capacity without losing its affinity with pollutants [23]. ...
August 2021
Separation and Purification Technology
... As an extensively utilized plastic, PS exhibits many intriguing merits, including prominent chemical and thermal resistance, the convenience of processing and molding, and low cost, and has been widely applied in industrial fields such as foams [19], thermal insulation [20], and architecture [21]. However, PS is highly flammable, and the severe dripping accompanying the released toxic smoke during combustion greatly hinders the applications of PS in industry fields. ...
July 2021
Colloids and Surfaces A Physicochemical and Engineering Aspects
... Waste thermocol was chemically modified with chitosan for adsorbing the anionic dyes namely Reactive Red 24 and Congo Red with enhanced adsorption capacity [37]. EPS waste was chemically modified by Friedel-Crafts reaction using various anhydrides namely maleic anhydride [29,38], 1,2,4-benzenetricarboxylic anhydride [28], succinic anhydride [39,40] for removing the hazardous colorants like methylene blue, Safranine T, Erichrome Black T, Malachite Green and Congo red. Modification with anhydrides improved the properties of the adsorbents like reusability, adsorption capacity, and thermal stability. ...
April 2021
Water Science & Technology