SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Kaini Yang,Xiangyu Wang,Iseult Lynch,Zhiling Guo,Peng Zhang,Lisi Wu
Nano zero-valent iron (NZVI) is an ideal material for treating chromium (VI). However, the NZVI's low loading and corrosion susceptibility in acidic Cr-containing industrial wastewater is the most pressing issue. Therefore, it is necessary to explore a method to construct novel NZVI composites with high loading, corrosion resistance, and outstanding activity. In this study, green 2-mercaptobenzimidazole (MBI) was employed for the first time as a corrosion inhibitor for NZVI to form a protective coating through chemisorption, thus blocking the corrosion of NZVI by reaction medium. Meanwhile, a novel multiphase green crystallization-assisted pore formation freeze-drying method was constructed to synthesize UiO-66-NH 2 regulated 3D network porous polyacrylonitrile (PAN) cryogel film for stabilizing NZVI, which is intended to remove Cr(VI) effectively and without secondary contamination. The synthesized MBI-Fe 0 @MOF/PAN possessed prominent activity, corrosion resistance, and considerable NZVI loading (45.9 mg/g). The Cr(VI) removal could still reach 82.7 % after 6 cycles, and the level of total dissolved iron ions was lowered to 0.255 mg/L. MBI-Fe 0 @MOF/PAN for rapid removal of Cr(VI) may be ascribed to the synergistic reaction of rapid protonation of MBI and strong reduction of NZVI. This study constructed the MBI corrosion-resistant interface and 3D PAN cryogel film concepts not only to broaden the horizons of designing efficient NZVI catalytic materials but also to promote the development of treatment technologies for acidic Cr-containing industrial wastewater.
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Foods
·
2022
·Vol. 11
·期 13
·1843
·
IF 5.561
Lanlan Wei,Yanan Chen,Dongliang Shao,Jingjun Li
In this study, a packed-fiber solid-phase extraction (PFSPE)-based method was developed to simultaneously detect nine quinolones, including enrofloxacin (ENR), ciprofloxacin (CIP), ofloxacin (OFL), pefloxacin (PEF), lomefloxacin (LOM), norfloxacin (NOR), sarafloxacin (SAR), danofloxacin (DAN), and difloxacin (DIF), in pure milk, using high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). Polystyrene (PS) and polyacrylonitrile (PAN) were combined to form PS-PAN composite nanofibers through electrospinning. The nanofibers were used to prepare the home-made extraction columns, and the process was optimized and validated using blank pure milk. The analytical method showed high accuracy, and the recoveries were 88.68–97.63%. Intra-day and inter-day relative standard deviations were in the ranges of 1.11–6.77% and 2.26–7.17%, respectively. In addition, the developed method showed good linearity (R2≥ 0.995) and low method quantification limits for the nine quinolones (between 1.0–100 ng/mL) for all samples studied. The nine quinolones in the complex matrix were directly extracted using 4.0 mg of PS-PAN composite nanofibers as a sorbent and completely eluted in 100 μL elution solvent. Therefore, the developed PFSPE-HPLC-MS/MS is a sensitive and cost-effective technique that can effectively detect and control nine quinolones in dairy products.Keywords:polystyrene-polyacrylonitrile nanofibers;quinolones;packed-fiber solid-phase extraction;HPLC-MS/MS;pure liquid milk
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 29
·13931-13939
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IF 3.925
Nan Sun,Yuhan Jing,Yong Zhang,Xinru Li,Yaoning Bai,Yuwei Yan,Taoyuan Ouyang,Honglin Tan,Xiaoming Cai,Jinming Cai
Copper-based photocatalysts have attracted much attention because of their great prospects in photochemical conversion. However, the preparation of highly stable copper-based photocatalysts is a challenge. In this study, copper nanoparticles (Cu NPs) wrapped in graphitized polyacrylonitrile (g-PAN) were prepared by a two-step sintering method. Even if Cu@g-PAN is placed in the air for one month, the Cu NPs were still not oxidized. Furthermore, we succeeded in further introducing graphitized carbon nitride (g-C3N4) into the g-PAN shell structure, which was confirmed using a Scanning Transmission Electron Microscope (STEM), FT-IR, and UV-Vis absorption spectra. Cu@g-PAN/g-C3N4 can degrade 88.61% of methylene blue (MB) in one hour, showing a higher catalytic activity than Ag@g-PAN/g-C3N4 (55.18%). XPS and Auger electron spectroscopy tests of catalyzed Cu@g-PAN/g-C3N4 show that Cu is not oxidized. We have proposed a possible mechanism for charge separation and transformation in the Cu@g-PAN/g-C3N4 composites to explain the enhanced photocatalytic performance. This work provides a new method to protect Cu NPs and demonstrates the prospect of rational design of copper-based photocatalysts with high stability and efficiency.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2002131
·
IF 6.147
Dayong He,Yuying Ma,Rui Zhao,Ju Qiu,Bolun Sun,Hao Wang,Mei Yang,Xiaoteng Jia,Xiang Li,Yongxin Li,Xiaofeng Lu,Ce Wang
Faced with the presence of radiation sources in many different areas, researchers are beginning to focus on the development of personal protective equipment. The design and manufacture of lightweight, lead-free, and flexible X-ray shielding materials have recently become a challenge in materials science, whereas, high-Z materials, which are essential raw materials for high-performance X-ray protective fillers, are non-renewable, and their exploitation and utilization usually require long-term planning. In this study, a new route is demonstrated to the preparation of multifunctional polymer/high-Z material nanofibrous membrane through electrospinning and subsequent solvothermal processes. The resultant Bi 2 WO 6 /WO 3 /polyacrylonitrile hybrid nanofibrous membrane possesses a remarkable X-ray attenuating property with an attenuation rate of 90.10% at 30 keV and a mass attenuation coefficient of 2.97 cm 2 g −1 at 83 keV. In addition, the freestanding hybrid nanofibrous membrane also possesses excellent photocatalytic activities for the degrading of cationic water pollutants, showing promising potential in industrial wastewater treatment, and providing a new strategy for the design and applications of multifunctional and recyclable shielding materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiangke Han,Peng Li,Maowa Zhang,Jingtao Wang,Yijun Cao,Tong Zhang,Guoli Zhou,Fengli Li
The agglomeration of nanoscale carbon-based material with excellent large specific surface area and numerous active sites remains a challenging, which decreases the adsorption efficiency. Herein, a three-dimensional (3D) half-embedded architecture adsorbent membrane (ES-PAN/AHCNs) was designed to address this weakness by combining the small-sized activated hollow carbon nanospheres （AHCNs） with polyacrylonitrile (PAN) fiber. The 3D architecture precludes the agglomeration of AHCNs, while the half-embedded of AHCNs ensures structural stability of fiber adsorbents. The adsorption capacity and mechanism of ES-PAN/AHCNs membrane were investigated by using metal ions (Pb(Ⅱ), Cu(Ⅱ), Cr(Ⅲ)). Concretely, the adsorption capacity of ES-PAN/AHCNs membrane to Pb(Ⅱ), Cu(Ⅱ) and Cr(Ⅲ) were 192, 186 and 179 mg g −1 , respectively, which was more than two times than that of AHCNs. Noticeably, the significant increase of adsorption capacity mainly benefits from the 3D half-embedded architecture, owing to that pure PAN fiber has negligible adsorption capacity. Moreover, the adsorption capability of ES-PAN/AHCNs membrane retained 82.1% after twelve adsorption-desorption cycles. The strategy of fabricating 3D half-embedded adsorbent membrane substantially expands the potential for AHCNs applications in the adsorption and water purification fields.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Weikang Hua,Tonghui Zhang,Siping Ding,Xuefen Wang
Nowadays, the functional carbonaceous nanospheres (CNS) originated from the simple one-pot hydrothermal carbonization reaction of the renewable biomass are getting much attention, attributing to the facile, low-cost and eco-friendly preparation method. However, the applications of the CNS suffer from many restrictions due to the difficulty of recovery from aqueous phase. Herein, we presented an easy, cost-effective and sustainable synthesis avenue to prepare a novel PAN/CNS nanofibrous membranes (NFMs) with plentiful carboxyl groups for effective adsorption of La 3+ ions through the fine combination of hydrothermal carbonization, electrospinning and alkaline activation treatment process. The resulting carboxylate rich PAN/CNS NFMs with ultrahigh CNS loading (up to 70 wt%) displayed good flexibility and excellent adsorption quantity towards La 3+ ions. The adsorption data preferred to follow the Langmuir isotherm and pseudo-second-order kinetic models, and the maximum adsorption amount of La 3+ ions calculated from the Langmuir isotherm model was up to 174.5 mg/g. Furthermore, the adsorption thermodynamics was also explored and the results revealed that the adsorption of La 3+ ions on the activated PAN/CNS-70 NFMs was a spontaneous and endothermic process. Meanwhile, the activated PAN/CNS-70 NFMs exhibited good reusability and the adsorption efficiency still maintained at about 90% after three recycling tests. Noticeably, this work may offer a new strategy to construct a cost-effective and environmentally friendly nanofibrous adsorbent for high efficient recovery of La 3+ ions.
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Frontiers in Pharmacology
·
2024
·
IF 4.4
Shuhui Zhou,Liping Zheng,Tingxuan Zheng,Haiyan Zhan,Qiuyuan Lin,Jiaoao Wei,Yong Huang
Background: Nephrotic syndrome has a significant impact on global health, often leading to cardiovascular disease and high mortality due to limited effective treatments. This study investigates the efficacy of Shensu IV in a puromycin aminonucleoside (PAN)-induced rat model of nephropathy.Methods: Rat models and in vitro podocyte PAN nephropathy models were established with PAN and treated with Shensu IV. Renal function was evaluated by measuring urine output and protein content, while hydrogen sulfide (H2S) and oxidative stress markers were quantified in serum and podocyte lysates. We conducted histological examination on kidney tissues and analyzed molecular markers (CD2AP, nephrin, and PI3K/AKT pathway) using RT-qPCR and Western blot.Results: Shensu IV significantly improved urine output and proteinuria, and attenuated glomerular damage, fibrosis, and mitochondrial swelling in PAN-treated rats. Mechanistically, Shensu IV enhanced endogenous H2S production, reducing oxidative stress and activating the PI3K/AKT pathway in vivo and in vitro. This facilitated the upregulation of the target genes CD2AP and nephrin, which are critical for maintaining glomerular integrity and improving renal function in PAN nephropathy models.Conclusion: Shensu IV and NaHS confer renal protection primarily by modulating oxidative stress and restoring the integrity of the glomerular filtration barrier through mechanisms involving the enhancement of the PI3K/AKT pathway and modulation of H2S levels. These findings suggest a promising therapeutic potential for these metabolites in the treatment of nephrotic syndrome.
研究领域:
药理学
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肾病学
·
分子生物学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Hongbao Wang,Zonglin Yi,Hao Liu,Zhenbo Zhao,Shouchun Zhang,Quangui Guo,Fangyuan Su,Xinghua Zhang
The boric acid modification offers an effective approach to improve the radial homogeneity and mechanical performance of polyacrylonitrile (PAN)-based carbon fibers by affecting stabilization behavior. However, the mechanism of how boron affects the stabilization process remains unclear. Herein, the impact of boron on the cyclization and oxidation reactions is investigated through experimental data and computational calculations. The results reveal that boron oxide exhibits a stronger electron-withdrawing effect on cyano nitrogen compared to hydroxyl oxygen, effectively inhibiting both ionic and free radical cyclization reactions, as well as subsequent oxidation reactions in the skin regions. This inhibitory effect enhances the cross-sectional oxygen uptake and stabilization. The boric acid also improves the preferred orientation in precursor fibers by reducing the polarity of cyano groups and promotes the inheritance of structural characteristics from precursor fibers through “cross-linking” effect. Consequently, the structural characteristics and mechanical properties of modified carbon fibers are significantly improved. These findings could provide fundamental insights into the mechanisms of thermal reaction regulation and microstructure evolution in the preparation of high-performance PAN-based carbon fibers.
研究领域:
材料科学
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高分子科学
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化学工程
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纳米技术
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机械工程
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高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 20
·2390-2397
·
IF 2.073
Dongcheng Yang,Jing Wang,Hou Chen,Hui Xu,Wenxiang Wang,Huawei Yang,Donglei Wei,Liangjiu Bai
A sensitive sandwich-type electrochemical immunosensor based on polyacrylonitrile-g-poly(hydroxyethyl methacrylate) (PAN-g-PHEMA)/graphene oxide (GO) composites was prepared for the ultrasensitive detection of tumor markers (alpha fetal protein, AFP as a model). The functional polymer brush was efficiently prepared by the union of cyano click chemistry and controlled/“living” radical polymerization (CRP). The designed immunosensor showed a low limit of detection (LOD, ∼0.285 pg mL−1), with a wide detection range (2.5 × 101 to 2.5 × 104 pg mL−1) (R2 = 0.9876). The electrochemical immunosensor also exhibited high sensitivity, favorable stability, excellent reproducibility and good selectivity towards AFP. Moreover, the immunosensor could be applied to the analysis of AFP in serum samples with satisfactory results. This present work may provide a general model for the detection of tumor markers based on sandwich-type immunosensors.
研究领域:
材料科学
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分析化学
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生物传感器
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生物医学工程
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NEW CARBON MATERIALS
·
2024
·
IF 6.5
Zhen-Yu Tian,Ya-fei Wang,Xin Qin,Ulugbek Shaislamov,Mirabbos Hojamberdiev,Tong-hui Zheng,Shuo Dong,Xing-hao Zhang,De-bin Kong,Lin-jie Zhi
Silicon anodes are promising for use in lithium-ion batteries. However, their practical application is severely limited by their large volume expansion leading to irreversible material fracture and electrical disconnects. This study proposes a new top-down strategy for preparing microsize porous silicon and introduces polyacrylonitrile (PAN) for a nitrogen-doped carbon coating, which is designed to maintain the internal pore volume and lower the expansion of the anode during lithiation and delithiation. We then explore the effect of temperature on the evolution of the structure of PAN and the electrochemical behavior of the composite electrode. After treatment at 400 -, the PAN coating retains a high nitrogen content of 11.35%, confirming the presence of C―N and C―O bonds that improve the ionic-electronic transport properties. This treatment not only results in a more intact carbon layer structure, but also introduces carbon defects, and produces a material that has remarkable stable cycling even at high rates. When cycled at 4 A g −1 , the anode had a specific capacity of 857.6 mAh g −1 even after 200 cycles, demonstrating great potential for high-capacity energy storage applications.
研究领域:
材料科学
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储能
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电化学
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纳米技术
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复合材料
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高影响因子
Carbon Letters
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2025
·
IF 5.8
Cao Hongshuo,Tian Yanhong,Sun Jiangman,Zhang Xuejun
Electrochemical treatment has a significant effect on the properties of carbon fibers (CFs). In this study, the effect of mild electric field action on the microstructure and properties of polyacrylonitrile (PAN)-based high-modulus CFs (HMCFs) and high-strength CFs (HSCFs) was investigated. Under the action of a mild electric field, CFs did not show obvious defects, but their microstructure, mechanical properties and electrical properties were affected. For HMCFs, the graphitization degree in both axial and radial directions of the fibers had a decreasing trend, the grain spacing increased, and the grain size and degree of orientation decreased, which led to a decrease in the tensile strength, tensile modulus and axial conductivity. However, for HSCFs, the pattern of change was exactly opposite to that of HMCFs. The results of this study can provide useful guidance for optimizing the production process and surface modification of CFs.
研究领域:
材料科学
·
电化学
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Qiuxue Zhang,Yunjiao Deng,Zhongyu Fu,Shuangquan Wang,Chao Zhou,Huixuan Zhang
Oil agent was a kind of auxiliary agent which played an important role in the processing of carbon fiber. High hydrophilia and low surface tension of polyether-epoxy modified polymethylphenylsiloxane (PEMPS) emulsions used as oil agent had been designed and prepared. Firstly, polyether modified methyldimethoxysilane (PMMS) was synthesized with methoxypolyethylene glycols (MPEG) and (3-isocyanatopropyl)dimethoxymethyl-silane (IPDS). PEMPS were synthesized by introducing PMMS into epoxy modified polymethylphenylsiloxane. With the PMMS content increasing from 0 % to 7 %, the water contact angle of PEMPS decreased from 79.0° to 32.4°. PEMPS emulsions were prepared with PEMPS, surfactants and water. Compared with PEMPS without PMMS, and the hydrodynamic size of PEMPS emulsion containing 7 % PMMS decreased from 310.3 to 159.3 nm, and the surface tension reduced from 22.9 to 20.6 mN/m. In addition, as the interaction between PEMPS and PAN was enhanced, the PEMPS emulsion contact angle on polyacrylonitrile (PAN) film also decreased from 36.2° to 27.8°, indicating that PEMPS emulsions had excellent hydrophilia and proper hydrodynamic size and could be used as PAN spinning oil when the PMMS was 7 %. The surface of PAN precursors coated by diluted PEMPS emulsions was flat, and a significant decrease in heat releasing of precursors during heat treatment could be observed. However, as the solid content was 3 wt%, many agglomerations appeared on the surface of the precursor. Taken together, 1 wt% PEMPS emulsion could repair the grooves on PAN precursors surface and benefit for the spinning process of PAN precursors.
研究领域:
材料科学
·
化学工程
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