CHEMICAL ENGINEERING JOURNAL
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2013
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IF 3.473
Wan-Zhong Lang,Jian-Ping Shen,Yi-Ting Wei,Qi-Ying Wu,Jing Wang,Ya-Jun Guo
The poly(vinyl butyral) (PVB) hollow fiber ultrafiltration membranes were prepared using three polyvinylpyrrolidones (PVPs) with different molecular weight ( M w ) as additives by wet spinning method. Effects of PVP M w on the coagulation process, morphologies and properties of the as-spun PVB membranes were researched with PVP M w and bore liquid. The results illustrate that the PVB/PVP/N-methyl-2-pyrrolidone (NMP) dopes have an instantaneous demixing mechanism and the demixing rate declines with the rise of PVP M w . The fibers fabricated with both two bore liquids have an asymmetrical single finger-like structure. Nevertheless, the fibers fabricated with 90 wt.% NMP aqueous solution as bore liquid form slightly longer single finger-like macrovoids and larger pores in the inner surfaces. The PVB membranes containing PVP with lower M w and with 90 wt.% NMP aqueous solution as bore liquid have higher hydraulic permeability ( J w ) than those containing PVP with higher M w and with 50 wt.% ethanol aqueous solution as bore liquid. The highest J w value 135.1 L M −2 H −1 bar −1 is obtained for the PVB membrane with a MWCO of 111.7 kDa. The break strain, elongation ratio and Young’s modulus values of the fabricated fibers increase when the PVP M w increases. The fibers with 90 wt.% NMP aqueous solution as bore liquid have lower mechanical properties than those with 50 wt.% ethanol aqueous solution as bore liquid.
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NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Tingting Shi,Zongjie Li,Miao Zheng,Wen Li,Wenwen Wu,Naipu He
Chitosan (CS) and polyvinylpyrrolidone (PVP) were crosslinked by glutaraldehyde and Zn2+ to fabricate polymer networks. Subsequently, CS/PVP sols were dropped into an alkaline solution resulting in deionization of hydrophilic groups and contraction of polymer networks to form CS/PVP beads with restricted networks. ZIF-8 crystals were incubated in the restricted networks to prepare ZIF-8@CS/PVP gel beads (CPZxB). The growth of ZIF-8 crystals in the restricted networks had more regular morphology. Meanwhile, the size of ZIF-8 crystals in beads were modulated by the molar ratio of 2-MeIM to Zn²⁺. Specifically, the size of ZIF-8 crystals was decreased with increasing the ratio of 2-MeIM to Zn2+. Additionally, the equilibrium adsorption capacity of beads for CO2 was 3.13 mmol/g oud initial pressure of 400kPa at 288.15K, and increased by 23% compared to ZIF-8 crystals. Adsorption mechanism was explored by kinetic model and Langmuir model, and the adsorption thermodynamic parameters were calculated using the Van't Hoff equation. The results indicated that adsorption of gel beads for CO2 primarily depended on chemisorption, and was a spontaneous exothermic process. As a result, it may be an effective strategy that growth of MOFs crystals in the confined networks could be form more regular morphology.
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Journal of Water Chemistry and Technology
·
2022
·Vol. 43
·期 6
·483-490
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IF 0.484
Luo Jinhua,Jiang Liping,Liu Cheng,Ruan Guihua,Du Fuyou
Abstract In this work, a porous polyvinylpyrrolidone/single-walled carbon nanotube incorporated polymerized high internal phase emulsion (PVP/SWCNT-polyHIPE) monolithic column was fabricated and developed as a solid phase extraction (SPE) adsorbent coupled with high performance liquid chromatography-fluorescence detection (SPE-HPLC-FLD) for the determination of tetracycline (TC), oxytetracycline (OTC), chlorotetracycline (CTC), and doxycycline (DC) in environmental water samples. The proposed monolithic sorbent was easily produced by in-situ polymerizing of high internal phase emulsions (HIPEs), and performed high extraction ability to the four tetracycline antibiotics (TCs). The extraction conditions including sample pH, sample flow rate, sample volume, desorption solvent and its volume were studied by investigating the recoveries of the four TCs, and the optimal extraction conditions were obtained. Under the optimized conditions, the PVP/SWCNT-polyHIPE based SPE-HPLC-FLD method exhibited good linearity in the range of 20–800 ng/mL for four tetracycline antibiotics with correlation coefficients higher than 0.9996. For water samples, the detection limits (LODs, S/N = 3) ranged from 1.0–2.5 ng mL −1 for four tetracycline antibiotics. The intra-day ( n = 15) and inter-day ( n = 5) precisions (expressed in terms of relative standard deviation (RSD %) were in the range of 0.5–2.2 and 1.3–5.7%, respectively. The spiked recoveries were in the range of 85.0–101.7 % with RSDs lower than 4.0%. Furthermore, the prepared polyHIPE monoliths allowed more than 100 extraction cycles without any loss in the extraction efficiency. The developed method enables us to detect trace tetracycline antibiotics in water samples. The method can be useful in the extraction and determination of antibiotics in all kinds of environmental water samples.
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LANGMUIR
·
2021
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IF 3.882
Peng Wang,Wenxu Zhang,Liang Wang,Suoting Fan,Yun Deng,Qian Liang,Bowen Chen
A superabsorbent polymer (SAP) was synthesized by solution polymerization. The influence of synthesis technology was studied and optimized, and FTIR, SEM, and TGA were used to characterize the structure and morphology of the material. Under the optimal synthesis conditions, the water absorption of the material can achieve about 80% of the saturation value in the first 20 min, and the material absorbs distilled water up to 2013 g/g. The SAP also has remarkable water retention and reswelling capability. The excellent performance makes it have a promising application in agriculture. In addition, the results show that the dosage of the reaction medium is a major factor for performance. Under the condition of the optimum value of other factors, the influence of the dosage of the reaction medium on water absorption can reach about 1000 g in distilled water.
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ACS Applied Energy Materials
·
2023
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IF 6.4
Meng Wang,Yingshuai Wang,Yuhang Xin,Qi Liu,Feng Wu,Hongcai Gao
Na super ionic conductor (NASICON)-type Na3V2(PO4)2F3 (NVPF) has been regarded as a prospective candidate of cathode materials for sodium-ion batteries due to its excellent structural stability, relatively high capacity and working voltage. However, the poor cyclability and rate capability, resulting from its low intrinsic electronic conductivity, have become a serious obstacle to their practical large-scale application. In this work, N-doped carbon coated NVPF composites (NVPF@NC) were successfully synthesized via a simple sol–gel method, in which low-cost polyvinylpyrrolidone was introduced as a nitrogen source. After high-temperature pyrolysis, a highly conductive N-doped carbon layer was in-situ constructed on the particle surface to enhance the sodium storage performance of NVPF. The optimized NVPF@NC cathode delivered high reversible capacity, excellent rate capability and long-term cycle life compared to pristine NVPF@C. The remarkable electrochemical performance of NVPF@NC cathode benefits from the modification strategy of introducing a heteroatom-doped carbon layer, triggering the formation of extrinsic defects and active sites in the N-doped amorphous carbon layer, which greatly enhances the electrical conductivity and the diffusion rate of sodium ions. This work provides a facile and effective approach for the preparation of N-doped carbon coated NVPF with remarkable sodium storage properties, which could be extended to other electrode materials electrochemical for energy storage.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Shicun Jin,Jinfeng Cao,Kuang Li,Jianzhang Li,Huining Xiao,Ping Wu
Hydrogels can simulate the physiological environment of soft tissues, showing great promise in spinal cord injury (SCI) repair. Nevertheless, hydrogels for effective SCI repair have limitations such as their inability to effectively contact with irregular cavities and structural damage caused by long-term physical movement. In this study, a unique and facile hydrogel with injectable, electroconductive, self-healing, and adhesive properties was synthesized by introducing tannic acid (TA) and polyvinylpyrrolidone (PVP)-stabilized polypyrrole (PPy) nanoparticles. Fe(III) ion-triggered in situ polymerization of pyrrole, and the dispersibility of PPy was significantly improved utilizing the stabilizing effect of PVP. The P@Py/TA had excellent injectable, self-healing, and cytocompatibility properties. Meanwhile, the hydrogel coating exhibited robust self-adhesion to different substrates. The P@Py/TA provided a suitable microenvironment for axon regeneration, effective angiogenesis, and immune-regulated function. This facilitated functional recovery from traumatic SCI. The multifunctional conductive P@Py/TA hydrogel scaffold provides a new strategy for SCI repair and has potential applications in other fields of bionic skin and multi-functional coatings.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Ding Qiteng,Liu Wencong,Liu Xinglong,Ding Chuanbo,Zhao Yingchun,Dong Ling,Chen Huiying,Sun Shuwen,Zhang Yiwen,Zhang Jinping,Wu Ming
Taxifolin (TAX) is a hepatoprotective flavanol compound, which is severely limited by poor solubility and low bioavailability. Liposomes (Lips) are used as well-recognized drug carrier systems that improve the water solubility and bioavailability of drugs, but are easily damaged by gastric juice after oral administration, resulting in the release of drugs in the gastric juice. Therefore, it is important to find materials that modify liposomes and avoid the destruction of the liposomal phospholipid bilayer structure by the gastrointestinal environment. Taxifolin liposomes (TAX-Lips) were modified by polyvinylpyrrolidone-k30 (PVP-TAX-Lips) and manufactured using a thin-film hydration technique. Particle size (109.27 ± 0.50 nm), zeta potential (−51.12 ± 3.79 mV), polydispersity coefficient (PDI) (0.189 ± 0.007), and EE (84.7 ± 0.2%) of PVP-TAX-Lips were studied. In addition, the results of in vitro release experiments indicated that the cumulative release rates of TAX-Lips and PVP-TAX-Lips were 89.73 ± 5.18% and 65.66 ± 4.86% in the simulated gastric fluid after 24 h, respectively, while the cumulative release rates were 68.20 ± 4.98% and 55.66 ± 3.92% in the simulated intestinal fluid after 24 h, respectively. Moreover, PVP-TAX-Lips were able to reverse lipopolysaccharide and D-galactosamine (LPS/D-GalN)-induced acute liver injury (ALI) by inducing autophagy to inhibit the expression levels of the TLR4/NF-κB signaling pathway and inflammatory factors, which suggested that PVP-TAX-Lips played an important role in the prevention of ALI and also provided a promising drug delivery system for the application of TAX.
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PubMed
高影响因子
Crystals
·
2021
·Vol. 11
·期 5
·459
·
IF 2.589
Yuchen Liu,Kousuo Dong,Linsheng Bian,Zisheng Guan
Inverted pyramid-texturing of silicon surface has been proven to have great application potential in silicon solar cells. In this paper, we utilized Ag-assisted chemical etching (Ag–ACE) technology combing with polyvinylpyrrolidone (PVP) to fabricate an inverted pyramid textured Si surface. We call it Ag@PVP–ACE. The effect of different experimental parameters on etching results was observed. We show that the microstructure of the Si surface exhibited two states as the concentration of NH4HF2and PVP concentration changed: polishing and inverted pyramid texturing. Meanwhile, we found inverted pyramids easier to form at the high temperature and low H2O2concentration of the etching system. Consequently, compared to inverted pyramid structures fabricated by nanostructure rebuilding (NSR) technology and Ag@PVP–ACE, we consider that Ag@PVP–ACE technology could become a viable strategy for fabricating inverted pyramid textured Si wafers in Si solar cells production.Keywords:inverted pyramid;metal-assisted chemical etching;synergism;textured single crystalline silicon wafers
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JOURNAL OF MEMBRANE SCIENCE
·
2015
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IF 5.056
Song Zhao,Wentao Yan,Mengqi Shi,Zhi Wang,Jixiao Wang,Shichang Wang
A new approach for fabricating polyethersulfone (PES)/ZnO ultrafiltration membrane is demonstrated. Nano-ZnO coated with polyvinylpyrrolidone (PVP) was prepared using dimethylformamide (DMF) as the solvent. The obtained ZnO-DMF dispersion was blended as an additive to fabricate PES/ZnO membranes with wet phase separation. The structure and performance of PES/ZnO membranes were characterized by the evaluation of surface pore size, porosity, water contact angle, pure water flux, BSA rejection and filtration resistance. The overall effect of ZnO-DMF dispersion addition on the structure and performance of the membrane was investigated by contrast with pure PES membrane. Compared with a pure PES membrane, PES/ZnO membranes have higher surface pore size, pore density and porosity, as well as improved surface hydrophilicity. The water fluxes of PES/ZnO membranes increased by approximately 210% compared with the pure PES membrane, with little change in BSA rejection. Besides, PES/ZnO membranes were also fabricated with different ZnO-DMF dispersions comprising a fixed content of PVP and different contents of nano-ZnO. The concrete contribution of nano-ZnO in ZnO-DMF dispersion on improving membrane performance was investigated by comparison with PES/PVP membrane. The results indicated that the incorporated nano-ZnO was favorable to the improvement of compaction resistance and antifouling property. The thermal stability of the PES/ZnO membranes was also improved compared to that of PES membrane.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Xiaoyi Zhang,Peixia Luo,Jiaming Wang,Lei Yang,Zipei Pang,Shufeng Chen,Yi Zhou,Linghao Qin
Cellulose derivatives play important roles in the development of pharmaceutical oral solid formulations. Owing to their high molecular weight and functional groups, these polymers can interact with water-insoluble drug crystals, influencing not only the drug's physicochemical properties but also its absorption efficiency. In this study, an anticrystallization experiment was designed to compare the inhibitory effects of cellulose derivatives (methylcellulose (MC), hydroxypropyl cellulose (HPC) and hydroxypropyl methyl cellulose (HPMC)) with those of polyvinylpyrrolidone (PVP) and poloxamer (F68) on the crystallization of model drugs (andrographolide, AG). Both in vitro characterization experiments and in vivo pharmacokinetic studies were conducted to evaluate the interaction patterns between andrographolide crystals and polymers. The results indicated that cellulose derivatives exhibited stronger anticrystallization effects, with HPMC showing the most pronounced interaction with drug crystals among all the tested polymers. HPMC significantly prolonged the crystallization time and increased the degree of supersaturation. By adsorbing onto specific crystal surfaces, HPMC was able to modulate the crystal growth orientation, reduce the contact angle, and improve the wettability of drug crystals. Furthermore, andrographolide crystals adsorbed by HPMC exhibited rapid in vitro drug release behavior and upgraded in vivo absorption efficiency, demonstrating its potential to improve the utilization of water-insoluble drugs.
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PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Mei Dong,Qiguang Cao,Song Li,Kebin Li
Designing stable and efficient heterogeneous catalysts for peroxymonosulfate (PMS) activation remains a critical challenge in advanced oxidation processes. Herein, we prepared a polyvinylpyrrolidone (PVP)-modified MIL-101(Fe)@CoZn-ZIF (PVP-MCZ) core-shell nanocomposite that synergistically combined enhanced catalytic activity with exceptional stability. The PVP-MCZ catalyst achieved complete degradation of 4-nitrophenol (4-NP) (20 mg/L) within 15 min, while suppressing metal leaching (<0.5 mg/L). Comprehensive characterization (XPS, EPR) revealed a dual-pathway mechanism: (i) radical-dominated SO 4 − generation via Co 2+ /Co 3+ and Fe 2+ /Fe 3+ redox cycling, and (ii) non-radical 1 O 2 production from PMS self-decomposition. This work provides a scalable strategy to design MOF-based catalysts for sustainable water remediation.
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ACS Omega
·
2023
·
IF 4.1
Yanling Li,Ying Wang,Junqing Wu,Yingying Pan,Huangqing Ye,Xiping Zeng
In this study, silver nanowires (AgNWs) were successfully synthesized by using a polyvinylpyrrolidone (PVP)-free hydrothermal method with an Alpinia zerumbet leaf chunk as a reducing agent and template. Meanwhile, the mechanism of biomass synthesis of AgNWs is also explored. The AgNWs have a diameter of ∼77 nm and a length of ∼10 μm. During the hydrothermal process, the biomass initially serves as a reducing agent to reduce silver ions. As the reaction proceeds, the biomass will form a pipe-shaped soft template by hydrothermal carbonization. Silver ions are adsorbed and reduced along the pipe-shaped soft templates to form silver nanorods, and adjacent nanorods are merged to AgNWs. Thus, AgNWs are grown along the pipeline soft template based on the oriented attachment mechanism. Inspired by this, the mechanism of the polyol method was further investigated. In the initial growth stage, AgNWs synthesized by the polyol method have a V-shaped notch. Therefore, AgNWs synthesized by the polyol method may also grow on the basis of the oriented attachment mechanism with PVP as a template.
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