POLYMER COMPOSITES
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2014
·Vol. 36
·期 11
·2076-2083
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IF 1.455
Huihui Xu,Jidi Cui,Chunyue Pan,Guipeng Yu,Shiyu Hong,Xipeng Wang,Zhijiang Yao
Polymer blends and composite films were facilely prepared from their aqueous solutions with varying contents of poly(3,4-ethylenedioxythiophene) (PEDOT), polyethylene oxide (PEO), and polyacrylic acid (PAA). The physicochemical and electric properties of the composite films were analyzed by Raman spectra, infrared spectra (FT-IR), scanning electronic microscopy (SEM), thermogravimetric analysis (TGA), and four-point probe method. PEDOT was successfully incorporated into each blend which was confirmed by spectra analysis. The crystallization of PAA or PEO and the structure of PEDOT should be taken into consideration for the electronic conductivity. According to Raman spectra, in the case of PEDOT–PAA–PEO, conformation of the PEDOT backbone changed from the quinoid to the benzoid structure partly. The ionic conductivities of lithium-ion salt-mixed PAA–PEO and ternary blend were characterized by AC impedance spectroscopy. The ternary blend with LiCoO 2 presents good electronic and ionic conductivity, and it appears to be a new candidate for polymeric mixed ionic electronic conductor. POLYM. COMPOS., 36:2076–2083, 2015. © 2014 Society of Plastics Engineer
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CLINICA CHIMICA ACTA
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2014
·
IF 2.764
Ting Yang,Fei Chen,Feifei Xu,Fengliang Wang,Qingqing Xu,Yun Chen
Background P-glycoprotein (P-gp) can efflux drugs from cancer cells , and its overexpression is commonly associated with multi-drug resistance (MDR). Thus, the accurate quantification of P-gp would help predict the response to chemotherapy and for prognosis of breast cancer patients . Methods An advanced liquid chromatography–tandem mass spectrometry (LC/MS/MS)-based targeted proteomics assay was developed and validated for monitoring P-gp levels in breast tissue. Results Tryptic peptide 368IIDNKPSIDSYSK380 was selected as a surrogate analyte for quantification, and immuno-depleted tissue extract was used as a surrogate matrix. Matched pairs of breast tissue samples from 60 patients who were suspected to have drug resistance were subject to analysis. The levels of P-gp were quantified. Using data from normal tissue, we suggested a P-gp reference interval. The experimental values of tumor tissue samples were compared with those obtained from Western blotting and immunohistochemistry (IHC). The result indicated that the targeted proteomics approach was comparable to IHC but provided a lower limit of quantification (LOQ) and could afford more reliable results at low concentrations than the other two methods. Conclusions LC/MS/MS-based targeted proteomics may allow the quantification of P-gp in breast tissue in a more accurate manner.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 11
·
IF 1.768
Ye Yuan,Shaokun Song,Sufen Deng,Qin Wang,Qisong Feng,Chuanxi Xiong,Lijie Dong
Exploration of new functionalization approaches to inert rigid fiber, activation inert surface, and enhancing interface adhesion is urgently required for fiber-based multiphase materials. In this paper, we developed a simple yet efficient method towards active functionalized poly( p -phenylene terephthalamide) fiber through mussel-adhesive, self-polymerization, and successive dipping–drying procedure based on as-designed detachable equipment. In comparison with current acid etching and high energy radiation methods, the active functional strategy achieves scatheless functional modification to inert rigid fiber. Attribute to π–π conjugation effect, the new active nanolayers integrate rigid fiber and polymer matrix into homogeneous-like structure. Consequently, the functionalized fiber-based composites exhibit great mechanical property and desirable field-responsive ability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43018.
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Journal of Environmental Sciences
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2014
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IF 1.922
Wei Yao,Pinhua Rao,Irene M.C. Lo,Wenqi Zhang,Wenrui Zheng
Pollutants that exist in anionic species are issues of concern in water treatment . Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments . In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties (QM-chitosan) was prepared and employed to remove chromium(VI) and phosphorus(V) (Cr(VI) and P(V)) from aqueous environments. The QM-chitosan was characterized by Fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), energy dispersive X-ray (SEM-EDX) and zeta potential . Batch experiments show that QM-chitosan can effectively remove Cr(VI) and P(V), and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI) and P(V) removal. The adsorption isotherms of both Cr(VI) and P(V) on the QM-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P(V) (2.783 mmol/g) was found to be higher than that of Cr(VI) (2.323 mmol/g), resulting from the size of the H 2 PO 4 − ions being smaller than that of the HCrO 4 − ions. However, the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI) than P(V). The adsorption–desorption of the QM-chitosan was evaluated, and high regeneration rates were demonstrated.
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TOXICOLOGY AND APPLIED PHARMACOLOGY
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2014
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IF 3.63
Demei Xu,Lihua Hu,Chuanyang Su,Xiaomin Xia,Pu Zhang,Juanli Fu,Wenchao Wang,Duo Xu,Hong Du,Qiuling Hu,Erqun Song,Yang Song
This study investigated the protective effects of curcumin on tetrachloro- p -benzoquinone (TCBQ)-induced hepatotoxicity in mice. TCBQ-treatment causes significant liver injury (the elevation of serum AST and ALT activities, histopathological changes in liver section including centrilobular necrosis and inflammatory cells), oxidative stress (the elevation of TBAR level and the inhibition of SOD and catalase activities) and inflammation (up-regulation of iNOS , COX-2, IL-1β, IL-6, TNF-α and NF-κB). However, these changes were alleviated upon pretreatment with curcumin. Interestingly, TCBQ has no effect on caspase family genes or B-cell lymphoma 2 (Bcl-2)/Bcl-2 associated X (Bax) protein expressions, which implied that TCBQ-induced hepatotoxicity is independent of apoptosis. Moreover, curcumin was shown to induce phase II detoxifying/antioxidant enzymes HO-1 and NQO1 through the activation of nuclear factor erythroid-derived 2-like 2 (Nrf2). In summary, the protective mechanisms of curcumin against TCBQ-induced hepatoxicity may be related to the attenuation of oxidative stress, along with the inhibition of inflammatory response via the activation of Nrf2 signaling.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shi-Ting Huang,Yong-Qian Lei,Peng-Ran Guo,Hong-Xin Chen,Shu-Chai Gan,Zeng-Hui Diao
In this study, a biomass-derived carbon block with heteroatoms (P and S) self-doped graphene structure was successfully synthesized by spent coffee grounds (SCG) directly sintered method. The spent coffee grounds biomass-derived carbon (SCC) block was used as electrocatalytic electrode to effectively degrade the antiviral drug of Favipiravir (FAV) in water, which represented excellent oxygen reduction reaction (ORR) activity with the H2O2 production. The doped heteroatoms in the graphene structure of SCC provided many active sites in the electrocatalytic electrode for ORR as well as more production of reactive OH･. Based on the structural characterization, radical species identification and intermediate products analysis, the reaction mechanism of FAV degradation by the SCC block electrode was proposed. This catalytic system also showed high ecological safety that the ecological toxicity for Vibrio fischeri was significantly reduced with the degradation process of FAV. The degradation of FAV in recycle test and in real sample of lake water, well water, tap water all demonstrated high stability of structure and catalytic activity of SCC. The electrocatalytic system based on SCC block electrode has realized the recycling and utilization of biomass resources and has promising application on the removal of environmental pollutants.
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JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Qing Fang,Qin Liu,Zongli Xie,Matthew R. Hill,Kaisong Zhang
Solvent-resistant nanofiltration membranes , capable of breaking “trade-off” between permeability and selectivity while resisting physical aging, hold crucial utility in developing advanced membrane materials and reducing energy consumption associated with solvent recovery. Herein, the development of scalable, mixed matrix membranes (MMMs) was presented based on polysulfone (PSf) substrate with ultra-high permeability and aging resistance. The upper selective layer was composed of poly-trimethylsilylpropyne (PTMSP) and two types of nano-fillers, namely poly-dichloroxylene ( p -DCX) and sodium dodecylbenzene sulfonate-molybdenum sulfide (SDBS-MoS 2 ). Under the influence of the additives, the redistribution of the free volume of the polymer as well as the internal spaces within additives creates additional pathways for solvent diffusion, thus increasing solvent permeance. Additionally, the combined effect of the two additives is likely to inhibit filler agglomeration and improve the overall effectiveness of the additives. Compared to pure PTMSP membranes, the p -DCX/SDBS-MoS 2 PTMSP MMMs exhibited enhanced methanol permeance (10.58 vs. 3.14 L m −2 h −1 bar −1 ) and RB rejection (99.23 vs. 96.13 %), which greatly exceeded that of current OSN MMMs. As anticipated, aging of the prepared membranes decelerated with the addition of the additives, and the methanol permeation loss rate decreased from 50.32 % to 13.23 % after 300 h. Molecular dynamics simulations explored by structural analysis revealed the mechanism for the significant improvement in methanol permeance and aging resistance. The membranes obtained were found to be highly industrially applicable, thereby offering the potential to reduce operation costs in energy-intensive separation processes.
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ACS Applied Nano Materials
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2024
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IF 5.3
Shuen Chen,Gengchang Lai,Xiaoyi Zhang,Xiaoxiao Feng,Liping Tong,Chenglong Peng,Xingchen He,Yang Li,Jiahong Wang
Phosphorus is an ideal anode material for high-rate lithium-ion batteries due to its high theoretical specific capacity and moderate operating potential. However, phosphorus undergoes tremendous volume expansion and low electrical conductivity during lithium storage, affecting its actual lithium storage performance. The formation of P–C bonds is an effective strategy to inhibit the volume expansion and maintain stable electrical contact between phosphorus and the current collector. Herein, high strength metal nanoparticles, such as molybdenum nanoparticles, are introduced into the ball milling process to reinforce P–C bonding and enhance the lithium storage performance. As a result, the BP/Mo/CNTs anode provides a high-rate capacity of 984 mAh g–1 at 8.0 A g–1 and high capacity retention of 90.3% after 300 cycles at 0.5 A g–1. To demonstrate the universality of this method, BP/W/CNTs nanocomposites were prepared by tungsten-assisted ball milling. This facile strategy provides a practical approach for the formation of abundant covalent bonds to improve the electrochemical performance of composites.
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ACS Nano
·
2024
·
IF 15.8
Haijian Huang,Hao Feng,Ziyu He,Yanan Huang,Jiawei Xu,Chengzhi Hu,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Enhancing proton storage in the zinc-ion battery cathode material of MnO2 holds promise in promoting its electrochemical performance by mitigating the intense Coulombic interaction between divalent zinc ions and the host structure. However, challenges persist in addressing the structural instability caused by Jahn–Teller effects and accurately modulating H+ intercalation in MnO2. Herein, the doping of high-electronegativity Sb with fully occupied d-orbital in MnO2 is reported. The Sb doping strategy engenders the formation of Mn–O–Sb path in the structure with a strong dipole polarization field, which facilitates the delocalization of eg orbital electron in Mn and thus mitigates the Jahn–Teller effects. Simultaneously, adjusting the level of Sb doping in MnO2 leads to modulation of the p-band center of O, optimizing its interaction with hydrogen and thereby enhancing proton storage. Consequently, MnO2 doped with 6% Sb exhibits commendable performance in both rate capability and cycling endurance, delivering 113 mAh g–1 at 2 A g–1 after 2000 cycles. This investigation underscores the crucial role of electronic structural engineering in elevating the electrochemical performance of cathode materials for zinc-ion batteries.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Jinmeng Wu,Yujiao Wen,Zihao Leng,Shun Zhang,Shikai Li,Zhonghua Zhou,Zhi Zhou,Nan Zhou
Atrazine (ATZ), a commonly used herbicide, poses significant environmental and health risks due to its persistence in aquatic environments. This study applied peroxymonosulfate-based advanced oxidation technology using N, P-doped rice straw biochar (NP@RSBC700), prepared via one-step pyrolysis, to degrade ATZ. The biochar produced at 700 °C exhibited optimal performance due to its enhanced graphitic structure (I D /I G = 0.77) and physicochemical properties. The NP@RSBC700-activated PMS system achieved a 100 % degradation efficiency of ATZ within a short period of just 2 h. N and P doping synergistically improved active sites, including C O, P-O, graphitic N, pyridinic N, and pyrrole N, alongside a porous structure (180.75 m 2 ⋅g −1 ) and defects, demonstrating the potential of this approach in environmental remediation applications. Liquid chromatography-mass spectrometry revealed three potential ATZ degradation pathways, with reduced intermediate toxicity and bioaccumulation confirming effective detoxification. Hydroponic experiments demonstrated that the biochar not only degraded ATZ efficiently but also mitigated its toxicity on plant seedlings. These findings highlight the multifunctional potential of N, P-doped biochar in PMS-based advanced oxidation processes, combining pollutant degradation with plant health protection.
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Applied Materials Today
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2024
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IF 7.2
Guobo Huang,Siqi Huo,Jiahao Ren,Wei Chen,Haiqin Yang,Shenwei Xiao,Tianle Wang,Hong Peng,Pingan Song
The nanomaterials have been deeply explored as flame retardants for various polymeric materials due to their multifunctionality, but they often fail to significantly increase the limiting oxygen index (LOI) and vertical burning UL-94 rating, thus unable to meet industrial needs (LOI>27.0 % and UL-94 V-0 rating). Herein, we fabricated a cerium/phosphorus-doped g-C 3 N 4 (Ce/P-CN) nanohybrid as a multifunctional high-efficiency fire retardant for acrylonitrile–butadiene–styrene (ABS). The Ce/P-CN nanoflakes featured a strengthening effect towards ABS, 10 wt% of which increased the tensile strength of ABS/(Ce/P-CN) by 33.8 %. Meanwhile, the ABS/(Ce/P-CN) nanocomposites showed remarkably enhanced high-temperature stability and carbonization performances relative to virgin ABS. Ce/P-CN simultaneously improved the anti-ignition, fire retardancy and smoke suppression of ABS due to the barrier effect of g-C 3 N 4 nanoflakes and the catalytic carbonization effect of cerium and phosphorus. Notably, adding 10 wt% Ce/P-CN increased the LOI and UL-94 rating of ABS to 28.6 % and V-0, respectively, demonstrating its high flame-retardant efficiency. Thus, the high flame-retardant efficiency and multifunctionality enable Ce/P-CN to outperform previous flame retardants for ABS. This work offers a novel strategy for the development of high-efficiency g-C 3 N 4 nanoflakes, which endow ABS with improved mechanical robustness and fire retardancy and show broad industrial prospects.
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Materials
·
2025
·Vol. 18
·期 5
·930
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IF 3.2
Jiatao Xie,Shengkang Hu,Mengyuan Wei,Shenghui Xie
Fe-based metallic glass (MG) exhibits excellent performance as a heterogeneous catalyst in degradation but is rarely used as a working electrode in electro-Fenton (EF) systems. We used Fe78Si9B13MG as the working electrode to investigate the effect of the EF process on the degradation efficiency of p-nitrophenol (p-NP). The EF system had the highest catalytic efficiency (the reaction rate was 3.4 times that of chemical degradation) at a voltage of −1 V (vs. SCE) and showed 95.6% degradation of p-NP within 30 min. The electrode voltage accelerated the generation of hydroxyl radicals (·OH) in the system, thus promoting pollutant degradation. In addition, the Fe78Si9B13MG cathode demonstrated good structural stability and reusability after 10 cycles. Fe78Si9B13MG ribbons can serve as a suitable cathode material and provide potential optimization solutions for the degradation of organic pollutants.
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