JOURNAL OF CHROMATOGRAPHY A
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2017
·
IF 3.981
Guicen Ma,Minglu Zhang,Li Zhu,Hongping Chen,Xin Liu,Chengyin Lu
Amine-functional reduced graphene oxide (amine-rGO) with different carbon chain length amino groups were successfully synthesized. The graphene oxides (GO) reduction as well as amino grafting were achieved simultaneously in one step via a facile solvothermal synthetic strategy. The obtained materials were characterized by X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectrometry and X-ray photoelectron spectroscopy to confirm the modification of GO with different amino groups. The adsorption performance of catechins and caffeine from tea acetonitrile extracts on different amine functional rGO samples were evaluated. It was found that tributylamine-functional rGO (tri-BuA-rGO) exhibited the highest adsorption ability for catechins and caffeine compared to GO and other amino group functional rGO samples. It was worth to note that the adsorption capacity of catechins on tri-BuA-rGO was 11 times higher than that of GO (203.7 mg g −1 vs 18.7 mg g −1 ). Electrostatic interaction, π-π interaction and surface hydrophilic-hydrophobic properties of tri-BuA-rGO played important roles in the adsorption of catechins as well as caffeine. The gravimetric analysis confirmed that the tri-BuA-rGO achieved the highest efficient cleanup preformance compared with traditional dispersive solid phase extraction (dSPE) adsorbents like primary-secondary amine (PSA), graphitized carbon black (GCB) or C18. A multi-pesticides analysis method based on tri-BuA-rGO is validated on 33 representative pesticides in tea using gas chromatography coupled to tandem mass spectrometry or high-performance liquid chromatography coupled with tandem mass spectrometry. The analysis method gave a high coefficient of determination (r 2 > 0.99) for each pesticide and satisfactory recoveries in a range of 72.1–120.5%. Our study demonstrated that amine functional rGO as a new type of QuEChERS adsorbent is expected to be widely applied for analysis of pesticides at trace levels.
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ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Chenxi Shi,Huan Wang,Xiaojing Wang,Kefeng Li,Pengbi Liu,Lihuan Wang,Hui Yu
Electrical stimulation (ES) dressings have garnered considerable attention owing to their profound impact on chronic wound care, while the existing ES dressings necessitate external power supply or intricate structures, posing potential safety risks and usage inconveniences. Herein, a safe, stable, simple, serviceable, and self-powered (5S) ES dressing composed of an electrospinning asymmetric nanofiber membrane with screen-printed electrodes and a polyurethane foam is developed. The asymmetric nanofiber membrane acts as the power due to its electrical double-layer effect during the unidirectional exudate transfer, and the polyurethane foam with excellent water absorption and retention properties effectively manages the exudate. This 5S dressing generates a sustained low-voltage direct current ES in situ at the wound site and creates a favorable microenvironment for wound re-epithelization. In vitro and in vivo studies indicate that this 5S dressing can significantly promote wound healing. Compared with the control group (on the 7th day), the collagen deposition of the 5S dressing treated group increased by 15.9%, the capillary density increased by 90.6%, and the epidermal thickness increased by 228.3%, resulting in a 23.6% enhancement in the wound healing rate. Consequently, the 5S wound dressing presents a highly sophisticated and effective therapeutic approach for accelerating wound healing.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Qing Ma,Yufeng Zhang,Yini Huangfu,Shangdong Gao,Canhao Zhou,Hui Rong,Liandong Deng,Anjie Dong,Jianhua Zhang
To effectively shield the full band of ultraviolet (UV) radiation and provide desirable protection, the combination of inorganic and organic filters was often used to protect human skin from the serious harm of UV exposure. However, the incompatibility of different filters and their mutual negative effect limit the production of multifilter sunscreen. In addition, the hazard of reactive oxygen species (ROS) produced by inorganic filters after UV exposure and the skin permeability of organic filters remain unresolved problems. In this study, titanium dioxide (TiO2) and diethylamino hydroxybenzoyl hexyl benzoate (DHHB), two kinds of common filters with complementary UV shielding range, were first encapsulated into large mesoporous silica nanoparticles (MSN, ∼300 nm) to obtain MSN-TiO2 and MSN-DHHB. Also, a SiO2 coating was then made to seal and stabilize the MSN-TiO2 and MSN-DHHB. The structure, UV screen function, and safety of the SiO2-coated filters, MSN-TiO2@SiO2 and MSN-DHHB@SiO2, were evaluated. The good mechanical stability exhibited by the solid SiO2 layer prevented the release and skin penetration of the sealed DHHB and the photocatalysis of TiO2. Furthermore, the combination of MSN-TiO2@SiO2 and MSN-DHHB@SiO2 in sunscreen cream showed excellent UV shielding performance on covering the whole UV radiation range without mutual interference. Therefore, coating SiO2 over MSN is a feasible strategy for entrapping various filters to improve their photostability, preventing skin penetration and ROS generation, and enhancing their compatibility with different sunscreen formulations.
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 5
·5587-5605
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IF 2.843
Zhou Jiacheng,Wu Linlin,Ge Yongxin,Gao Yifeng,Ma Xiaofeng,Fang Ying
Deep eutectic solvent (DES)-based gels, with their biocompatibility, non-volatility, low cost, and electrochemical stability, have attracted widespread interest as novel solid-state ionic conductor for flexible devices. However, fabrication of tough and stretchable DES gels is challenging due to the insufficient understanding of the interactions between polymers and DES. The development of tough DES gels based on hydrogen bonding is attractive but also challenging due to the possible competitive hydrogen bonds between the hydrogen bond-rich choline chloride-based polar DES and polymers. Herein, tough copolymer-supported DES gels with dual-cross-linked dissipative network were fabricated through copolymerization of methacrylic acid and N , N -dimethylacrylamide monomers with good and poor compatibility with DES to promote the formation of stable hydrogen bonds between polymers in the DES. The resulting DES gels were stiff, tough, stretchable, and self-recoverable, with tensile strength, breaking strain, Young's modulus, toughness, and recovery ratio being 2.08 MPa, 792%, 1.76 MPa, 12.88 MJ m −3 , and 76%, respectively. The mechanical properties of DES gels could be widely tuned by varying the monomer ratio and solvent structure changes. The carbon-based supercapacitor based on the DES gel shows stable voltage window to 2 V and exhibits the specific capacitance of 93.25 F g −1 at 2 A g −1 . Graphical abstract An ultratough and stretchable copolymer-supported DES gel ionic conductor with high tensile strength of 2.08 Mpa, high toughness of 12.88 MJ m −3 , stretchability of 792%, and excellent recovery properties are facile fabricated for flexible electronics through copolymerization of two monomer pairs of methacrylic acid and N , N -dimethylacrylamide that can form stable hydrogen bonds in the DES environment with a small amount of chemical cross-linker to form a dual-crosslinked dissipative network.
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JOURNAL OF CHROMATOGRAPHY A
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2013
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IF 4.612
Hao-Bo Zheng,Qin Zhao,Jie-Zhen Mo,Yun-Qing Huang,Yan-Bo Luo,Qiong-Wei Yu,Yu-Qi Feng
By using magnetic graphitized carbon black and primary secondary amine (GCB/PSA/MNPs) as adsorbent, a modified quick, easy, cheap, effective, rugged and safe (QuEChERS) method was proposed for pesticide residue analysis in vegetables. The magnetic adsorbent was fabricated via simple co-mixing method based on an “aggregate warp” mechanism. To achieve the optimum conditions of modified QuEChERS toward target analytes, several parameters, including the composition of analyte protectants and the amount of the adsorbents were investigated. Under the optimized conditions, a simple, rapid and effective method for the determination of 10 pesticide residues in vegetables was established by coupling modified QuEChERS to gas chromatography/mass spectrometry analysis. The detection limits of the proposed method for 10 pesticides ranged from 0.39 to 8.6 ng/g. Good linearity ( R value ≥ 0.990) was achieved at concentration levels of 10–200 ng/g, and acceptable method reproducibility was found as intra- and inter-day precisions, yielding the relative standard deviations less than 10.7% and 13.4%, respectively. The recoveries were in the range of 69.9–125.0% at different concentrations for real samples. Compared with the reported methods for the determination of a large number of samples, the proposed method has the advantage of less time-consuming in clean-up procedure.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 44
·23238-23242
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IF 8.867
Xiaoyu Jiang,Lifen Xiao,Xinping Ai,Hanxi Yang,Yuliang Cao
Safety, energy and power density are critical issues for successful application of lithium-ion batteries (LIBs) in portable electronic devices, electric vehicles (EVs) and large-scale energy storage systems. A separator is a key component to ensure the safety and improve the performance of LIBs. Herein, a thermally induced shutdown separator of poly(lactic acid)@poly(butylene succinate) (PLA@PBS) is successfully fabricated by a facile coaxial electrospinning process. The electrospun PLA@PBS separator possesses synchronous characteristics of high thermal sensitivity (prompt shutdown response) and high thermal stability (structural integrity) as well as excellent wettability to liquid electrolytes. Full cells using the bifunctional PLA@PBS separators exhibit superior cycling performance and rate capability compared to those using commercial Celgard separators. These attractive characteristics make the PLA@PBS membrane a promising separator for high safety and high energy/power density LIBs.
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Analytical Methods
·
2016
·Vol. 8
·期 33
·6313-6322
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IF 1.915
Yanan Wu,Rong He,Zhigao Wang,Jian Yuan,Changrui Xing,Lifeng Wang,Xingrong Ju
Rice (Oryza sativa L.), an important cereal crop, has been seriously contaminated by cadmium (Cd) in the world. In this study, we compared the effects of three organic acids (citric acid, malic acid and tartaric acid) which are all approved food additives on the removal of Cd and developed a safe, efficient and simple technique to remove Cd from contaminated brown rice flour using citric acid (CA). The optimal conditions for citric acid removal of Cd were determined by a three-level Box–Behnken design with three factors (CA concentration, treatment temperature and treatment time) under the condition that the liquid–solid ratio was 12 mL g−1 and the shaking speed was 150 rpm, and the results were as follows: CA concentration, 0.08 mol L−1; treatment temperature, 45 °C; and treatment time, 53.09 min. Under these conditions, the removal efficiency of Cd was 94.28 ± 0.06%, which agreed well with the predicted value of 94.75%. Moreover, the contents of the main chemical components such as protein, starch and fat in the brown rice flour were still very high after citric acid treatment, indicating that this technique did not affect the quality of brown rice flour. This technique was also used in other brown rice flour samples and satisfactory results were obtained. Therefore, this technique is efficient in removing Cd and may have the potential to be used in the food industry to solve the Cd-rich rice problem in the world.
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Plants-Basel
·
2025
·Vol. 14
·期 12
·1851
·
IF 4.1
Xinghai Zhang,Xinyu Feng,Yani Pan,Hanfei Wuzeng,Xinxin Wang,Anran Yan,Lin Xiang,Yaping Lin,Ping Chen,Qiang Chu,Liping Liu
Pu’er raw tea, a representative tea with a positive correlation between quality and storage time, has a unique aging process. It can not only reduce the heavy astringent taste of newly produced tea, but also has a complex and fragrant aging aroma. However, the extremely slow natural aging process often takes years or even decades for quality transformation, along with the risk of termite infestation, odor absorption, etc. This study found that UV-C irradiation could significantly accelerate the aging process of tea. It enhanced the richness of the aroma, while reducing astringency and creating a smoother and mellower taste. The results of substances analysis revealed an increase in key aroma compounds such as alcohols, aldehydes and terpenes, and a decrease in catechin and caffeine with UV-C irradiation, which is consistent with the natural aging trend. An efficient and safe rapid aging technology of Pu’er raw tea has been successfully established.
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JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 17
·3546-3554
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IF 2.878
Xuemin Ye,Beibei Ye,Jiahui Xu,Mei Fang,Danqi Dong,Congcong Wu,Xupin Lin,Yehui Hu,Xiaoji Cao,Weimin Mo
In this work, a novel quick, easy, cheap, effective, rugged, and safe technique with hydrophobic natural deep eutectic solvent as both extractant and analyte protectant was developed and combined with gas chromatography–tandem mass spectrometry to analyze pyrethroid residues in tomatoes. Eight hydrophobic natural deep eutectic solvents were first evaluated as analyte protectants and those with decanoic acid or lactic acid as hydrogen bond donor were demonstrated to be effective in compensating for the matrix effects of pyrethroids in the gas chromatography system. Hence, they were added to solvent standards for correcting the quantitation errors instead of matrix-matched calibration standards. Then the abilities of these acid-based deep eutectic solvents to extract pyrethriods from tomatoes were evaluated. Results showed the recoveries of all pyrethroids reached to over 80% with only 5 mL menthol:decanoic acid (1:1) used, and good phase separation was easily achieved without the addition of inorganic salt in the extraction step, indicating hydrophobic natural deep eutectic solvent could be a green substitute for acetonitrile in the quick, easy, cheap, effective, rugged, and safe extraction. Compared with the conventional method, the proposed protocol improved the recoveries, reduced the matrix effects, and simplified the extraction step, demonstrating to be an effective, fast, and green method.
研究领域:
分析化学
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环境科学
·
食品安全
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JOURNAL OF SEPARATION SCIENCE
·
2021
·Vol. 44
·期 11
·2269-2278
·
IF 3.645
Xuelei Chen,Wei Li,Jingguang Li,Sai Fan,Zhixiong Shi
Organophosphorus flame retardants are a class of widely used plasticizers and flame retardants. In this study, an analytical methodology for the simultaneous determination of 13 organophosphorus flame retardants in milk was developed by using high-performance liquid chromatography-tandem mass spectrometry in combination with a modified quick, easy, cheap, effective, rugged, and safe technique and solid-phase extraction. The experimental parameters of the sample purification procedure and high-performance liquid chromatography-tandem mass spectrometry were optimized. The developed method was validated in terms of linearity, limits of detection, recovery, and precision. The method showed a linear response in the 1–100 ng/mL concentration range and the limits of detection ranged from 0.001 to 0.3 ng/mL. The mean recoveries for most organophosphorus flame retardants were in the ranges of 75.0–115.8% (spiked at 2.5 ng/mL) and 76.7–124.8% (spiked at 25 ng/mL), with relative standard deviations of <13.09%. The developed methodology was successfully applied to the analysis of nine human milk samples and nine commercial cow milk samples. Eleven organophosphorus flame retardants were detected in the human milk samples, with median concentrations that ranged from lower than the limit of detection to 1.47 ng/mL, and only nine organophosphorus flame retardants were detected in cow milk samples, with median levels of <0.32 ng/mL.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ruijing Li,Zhao Fang,Cheng Wang,Xinlin Zhu,Xiaolong Fu,Jiajun Fu,Wuwei Yan,Yong Yang
Solid-state polymer electrolytes (SPEs) with outstanding flexibility and self-healing capacity are appealing for utilization in reliable and wearable electronic devices. Herein, a highly stretchable (extensibility > 1500% and stress > 490 kPa), non-flammable and notch-insensitive intrinsic self-healing SPE based on six-armed poly(N,N,N-trimethyl-N-((2-(dimethylamino)ethyl methacrylate)-7-propyl)-ammonium dual bis(trifluoromethanesulfonyl) imides), imidazole-based ionic liquid (EMIM–TFSI) and LiTFSI is fabricated. The multi-armed structure in combination with the multiple charged center endow the six-armed dicationic polymeric ionic liquid (DPIL-6) with significantly strengthened ionic attractions and Van der Waals' force among the polymer segments, thus conferring the DPIL-6 derived SPE (DPIL-6-SPE) with prominent self-healing ability (recovery time < 2 h, 25 ℃). Moreover, DPIL-6-SPE presents a superior adhesion strength (weight loading > 200 g) towards lithium electrode, signifying excellent interfacial compatibility. Compared with the counterpart of monocationic polymeric ionic liquid derived SPE (MPIL-6-SPE), the multiple cationic center in DPIL-6-SPE facilitates the dissociation of lithium salt and liberates more Li + from trapping with TFSI - , thereby resulting in a superior ionic conductivity (over 10 -5 S cm −1 at room temperature) and lithium ion transference number (0.46). The as-assembled LiFePO 4 /DPIL-6-SPE/Li battery can deliver a high discharge capacity of 152.6 mAh g −1 at 0.1C, and its capacity retention rate reaches 94% after 50 cycles with a coulombic efficiency of 96%. In particular, the mechanical properties and conductivity of DPIL-6-SPE can fully recover after repeated damage, conferring the derived soft-pack battery stable powering capacity upon multi-angle bending and folding. The design of multi-armed and multiple charged PILs provides new avenues for developing flexible electronic devices with self-healing capacity.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xianli Song,Haitao Zhang,Danfeng Jiang,Lipeng Yang,Jiahe Zhang,Meng Yao,Xiaoyan Ji,Gongying Wang,Suojiang Zhang
Solid-state batteries , which exhibit characteristics including uniform Li deposition, non-flammability and low interfacial resistance, are desirable for novel energy storage devices. Herein, a self-standing, fireproof and electrochemically stable organic-inorganic composite ionogel electrolyte was carefully designed and prepared by using polymerized ionic liquid (PIL), ionic liquid (IL), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium aluminum titanium phosphate (LATP) nanoparticles . The incorporation of LATP nanoparticles into polymer backbone was found to facilitate ionic transport due to the homogenous Li + distribution, which would further boost the ionic conductivity and mechanical properties. In addition, the introduction of IL favored the reduction of interface resistance. Benefiting from the nonflammability, the thermal shrinkage performance of as-prepared electrolyte could stand over a broad operating temperature range. A Li/Li symmetric cell containing optimized PIL-14 wt% LATP could be cycled steadily for over 2000 h at 50 °C. A lithium metal battery containing composite ionogel electrolyte exhibited an outstanding specific capacity of 145 mAh g −1 and 95% capacity retention at 50 °C even after 100 cycles. This study indicates that the co-employment of IL and inorganic nanoparticle is an effective strategy for the construction of organic-inorganic hybrid electrolytes for high-safety solid-state lithium metal batteries (LMBs).
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危险品化学品经营许可证（带存储）