ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·18499-18508
·
IF 5.19
Suo Decheng,Song Zhandeng,Xiao Zhiming,Zhuang Fenting,Fan Li,Fan Xia
A method based on a multi-mechanism impurity adsorption and ultra-performance liquid chromatography–tandem mass spectrometry was established to detect fipronil and four of its metabolites in chicken feathers. This method was successfully applied to the depletion study of fipronil in feathers of laying hens. Fipronil and two metabolites were found in feathers during treatment. Fipronil concentrations in feathers increased during medication and then regularly decreased during withdrawal, and they were still detected on the 14th day after withdrawal. High residue concentrations were also present in feathers on day 23 of the experimental period. Pollution sources of fipronil can be inferred on the basis of the residue ratio of fipronil metabolites from different pollution modes. Result shows that feathers were an effective matrix for residue monitoring and risk analysis of fipronil in animals and the environment.
研究领域:
动物学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yuling Xiao,Xiaowei Mu,Siqi Chen,Guangyong Jiang,Zhoumei Xu,Chao Ma,Lei Song,Yuan Hu
As one of the most widely used polymers, the intrinsic brittleness and high flammability bring about a stringent requirement for the practical application of epoxy resins (EPs). It is difficult to toughen EP without compromising its mechanical and thermal properties for many conventional toughening agents. Here, a novel furan-derived bio-based polyphosphazene (PFMP) with a flexible backbone and rigid side groups was prepared by the nucleophilic substitution reaction between polydichlorophosphazene (PDCP) and furfuralcohol. The resultant PFMP was incorporated into EP to realize exceptional toughening, strengthening, and flame retardant function. By adding 15% of PFMP, the limit oxygen index value is from 25% (EP) to 33% (EP/PFMP-15) and reaches the UL-94 V-0 rating. According to the cone calorimeter results, EP/PFMP-15 exhibits exceedingly reduced peak heat release rate (pHRR) (50.2%) and total heat release (THR) (49.6%). The significantly increased fire performance index (FPI) and decreased fire growth rate index (FIGRA) of EP/PFMP-15 demonstrate an improvement in its flame retardancy. The catalytic carbonization effect (condensed phase) and radical quenching effect (gas phase) of PFMP account for the greatly improved flame retardancy. Moreover, the impact and tensile tests indicate that PFMP can ameliorate the mechanical performance of EP with a maximum increase of impact strength (111.8%) and elongation at break (35.2%) for EP/PFMP-5. With 15% PFMP added, the tensile strength of EP/PFMP-15 increases by 40.4%. This work demonstrates that PFMP is expected to overcome shortcomings (flammability, toughness, and strength) of EP and spread its applied fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Amir Abdul Razzaq,Ganwen Chen,Xiaohui Zhao,Xietao Yuan,Jiapeng Hu,Ziwei Li,Yufeng Chen,Jiabin Xu,Rahim Shah,Jun Zhong,Yang Peng,Zhao Deng
Sulfurized polyacrylonitrile (SPAN) represents a unique class of cathode material for lithium sulfur (Li-S) batteries as it eradicates the polysulfides shuttling issue in carbonate-based electrolyte. However, due to the essential chemical S-linking and organic nature of SPAN, the active mass percentage and rate capability are two bottleneck issues preventing its ultimate deployment outside of laboratories. In the current work, aiming to endow both the charge conductivity and catalytic activity to SPAN for maximizing the redox kinetics of S conversion, a freestanding nanofibrous SPAN cathode embedding conductive CNTs and atomically dispersed Co centers is fabricated via multivariate electrospinning. While the CNTs enable dramatically enhancing the fiber conductivity and generating mesoscopic porosity for facilitating charge and mass transportation, the cross-linking of SPAN by Co-N 4 S motifs creates extra charge conduction pathways and further serves as the catalytic active sites for expediting redox S conversion. As a result, an extraordinary Li-SPAN performance is achieved with a high specific capacity up to 1856 mAh g −1 @0.2 C, a superb rate capability up to 10 C, and an ultra-long battery life up to 1500 cycles@1 C. Consequently, our study here provides insights into the adoption of coordination chemistry to maximize the sulfur utilization by ensuring a more complete redox conversion from SPAN to Li 2 S, and vice versa .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lin Mei,Chao Feng,Yuzhong Wang,Qiang Yu,Wenjie Xin,Weifeng Chu,Yanan Wang,Xiangxue Zhu,Shenglin Liu,Hongxia Wang,Longya Xu
Synthesis of acetonitrile (ACN) by way of ethanol dehydroamination process was performed over copper-, zinc-, nickel-, and cobalt-based catalysts in a fixed-bed reactor, by which 20Co/Al2O3 was found to be the best one and ready for subsequent La, Ce, and Pr doping. Then, catalytic tests and a series of characterizations such as XRD, XRF, XPS, TEM, TG-DTA, IGA, NH3-TPD, and N2 adsorption–desorption were carried out. The results demonstrate that rare-earth-modified 20Co/Al2O3 catalysts have improved the catalytic performance for ethanol dehydroamination remarkably; the addition of La leads to better dispersion of cobalt species, the higher surface area of 20Co/Al2O3 catalyst, and fast adsorption for ACN, as well as better resistance to carbon deposition. In the meantime, the La-doped catalyst seems to prefer the route of acetaldehyde imine to ACN rather than to ethylamine, and consequently, a highly selective synthesis of ACN with excellent catalytic stability was obtained with the formation of ethylamine being suppressed..
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2735-2744
·
IF 1.5
Liu Zengcheng,Xu Yufen
In this paper, a two-step precipitation polymerization method was used to prepare a magnetic poly(cyclotriphosphazene-co-3,3′-sulfonyl dianilide) (MPSD) as an adsorbent for the removal of the radioactive element thorium(IV) in aqueous solution. The magnetic material was characterized and analyzed by FTIR, XRD, SEM, BET and VSM. The experimental results showed that the adsorption capacity of MPSD was 286.7 mg/g when pH was 4.0. And the adsorption process fitted the Langmuir model ( R 2 = 0.9991) and the pseudo-secondary kinetic model ( R 2 = 0.9997). At the same time, the thermodynamic data indicated that the removal of thorium(IV) by MPSD microspheres was a spontaneous endothermic process.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Rui Yu,Yunkun Qian,Yanan Chen,Yijun Shi,Jun Guo,Dong An
Dichloroacetonitrile (DCAN) is an emerging disinfection by-product (DBP) that is widespread in drinking water. However, the pathway for DCAN formation from aromatic amino acids remains unclear, leading to a lack of an understanding of its explicit fate during chloramination. In this study, we investigated the specific formation mechanism of DCAN during the chloramination of phenylalanine based on reaction kinetics and chemical thermodynamics. The reason for differences between aldehyde and decarboxylation pathways was explained, and kinetic parameters of the pathways were obtained through quantum chemistry calculations. The results showed that the reaction rate constant of the rate-limiting step of the aldehyde pathway with 1.9 × 10 −11 s −1 was significantly higher than that of decarboxylation (3.6 × 10 −16 s −1 M −1 ), suggesting that the aldehyde pathway is the main reaction pathway for DCAN formation during the chloramination of phenylalanine to produce DCAN. Subsequently, theoretical calculations were performed to elucidate the effect of pH on the formation mechanism, which aligned well with the experimental results. Dehydrohalogenation was found to be the rate-limiting step under acidic conditions with reaction rate constants higher than those of the rate-limiting step (expulsion of amines) under neutral conditions, increasing the rate of DCAN formation. This study highlights the differences in DCAN formation between the decarboxylation and aldehyde pathways during the chloramination of precursors at both molecular and kinetic levels, contributing to a comprehensive understanding of the reaction mechanisms by which aromatic free amino acids generate DCAN.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Kunpeng Mou,Xiaoxi Feng,Fangxiong Tang,Wenzhen Wang,Xudong Tang,Yongning Liu,Benlan Zeng,Sirui Bao,Minghao Cui,Jianing Hu,Huaxing Gou,Yan Zhu,Jinkun Liu,Run Xu
It is of great importance to choose a suitable solvent for the growth of high-quality CsPbBr3 single crystals. Here, by introducing acetonitrile (ACN) to the mixture of dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) solvents, the solubility curve of CsPbBr3 exhibits a monotonic decrease in the temperature range of 20–80 °C, which can reduce the growth temperature to around 45 °C. Besides, the addition of ACN significantly increased the yield of single crystals to 38.71%. The quality of CsPbBr3 single crystals grown in the DMSO/DMF/ACN precursor was improved, evidenced by a full width at half maxima (FWHM) of 0.035° in the X-Ray rocking curve of (100) and the absence of secondary phase inside the crystal from the infrared image. A μτ value of 2.57 × 10−4 cm2 V−1 from the corresponding devices can be achieved, comparable to that of crystals grown by the melt method. Our work here provides a promising solution recipe for the preparation of high-quality CsPbBr3 single crystals.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Ke Wang,Mengxiong Li,Jiajia Zhang,Hongbin Lu
Graphene film has potential to act as an excellent heat dissipation material. However, its thermal conductivity suffers from some limitations, including small graphene lateral sizes and low production efficiency from a practical viewpoint. To solve these issues, we propose an industrially viable protocol to synthesize homogeneously oxidized graphite oxide (GtO) with large lateral sizes and easy-purifying features. We employ polyacrylonitrile (PAN) as a coupling agent to repair the defects on GtO sheets and link these sheets together during the annealing treatment. The graphitized GtO/10%PAN film (g-GtO/10%PAN) shows excellent thermal and electrical properties, with an in-plane thermal conductivity of 1629.24 ± 43.88 W m −1 K −1 and an electrical conductivity of 9645.29 ± 199.44 S cm −1 . Furthermore, it also exhibits outstanding flexibility; the original thermal conductivity can be maintained after 20,000 times bending. The g-GtO/10%PAN film offers an alternative to replace commercially used graphitized polyimide (PI) film. Our research provides a general method for the fabrication of high quality graphene film.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2025
·
IF 2.8
Meichen Liu,Yingxia Guo,Ziyi Niu,Yufeng Guo,Shuang Feng,Xiaoyan Zhang,Jiansong You,Lei Yin,Hongyu Xue,Meiyun Shi
A sensitive and selective ultra-performance liquid chromatography-tandem mass spectrometry cubed (UPLC-MS 3 ) assay was established for detection of fipronil in zebrafish tissue samples. Following protein precipitation pretreatment, the concentrations of fipronil in various zebrafish tissue samples were quantified by the developed UPLC-MS 3 assay. Fipronil was monitored by MS 3 transition ( m/z 435.0 → 398.9 → 330.0) with a ± 1.0 Da isolation window for secondary product ions. Chromatographic separation was achieved with 0.1 % formic acid-water ( v /v) as the aqueous phase and acetonitrile as the organic phase. Gradient elution with C 18 column was employed for separation of fipronil and probenecid (internal standard, IS). Method validation demonstrated excellent linearity over the range of 0.1–10 ng/mL (r 2 > 0.995), with the accuracies ranging from −10.33 % to 3.17 % and precisions between 3.25 % and 11.34 %. Consistent extraction recoveries (89.92–113.49 %) and acceptable matrix effects (92.54–110.27 %) were observed across all tested matrices. The implementation of MS 3 scanning significantly enhanced specificity by eliminating endogenous interference compared to conventional MRM detection. The successful application of this method in zebrafish tissue distribution studies confirmed its reliability for environmental toxicology research. This MS 3 -based approach provides a robust analytical platform for investigating biodistribution of fipronil in aquatic models.
研究领域:
分析化学
·
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Xiqi Su,Le Wang,Xiao Zhang,Jin-Hua Xie,Yi Qu,Di Zhang,Li-June Ming
The extensive use of tetracycline antibiotics (TCs) renders their widespread in the environment that may cause bacterial resistance. Thus, detection of residual TCs and understanding of their broader roles and impacts in the environment and soil ecology are is of critical significance. This paper describes the investigation of a Mg (II)-specific fluorescent micro-probe (PCC–Mg) based on cyclotriphosphazene (Cpz) and curcumin for classical TC•HCl sensing with a low detection limit of 29 nM and a fast response time of less than 10 s. The sensing mechanism is presumably attributed to specific Mg 2+ binding with TCs since the fluorescence enhancement is not observed in the absence of Mg 2+ and not influenced by the presence of several metal ions and anions. The binding of Mg 2+ to curcumin/TC and the formation of TC-metal-curcumin ternary complex can be concluded with NMR and mass spectrometry . Moreover, for the purpose of easy applications, test strips are made to render visual detection of TC with noticeable and selective fluorescence enhancement. The formation of the ternary complex between Cur from the popular herb Curcuma longa and TC from Streptomyces spp. mediated by metal ions also hints a potential role of microbiolochemical-phytochemical interactions in maintaining biodiversity and equilibria in soil microecology.
研究领域:
环境科学
·
分析化学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Boyu Du,Yang Sun,Bingyang Liu,Yingying Yang,Si Gao,Zhenshu Zhang,Xing Wang,Jinghui Zhou
In this work, lignin-based nanofibers were produced from corn stalk lignin (CSL)/lignin-derived bio-oil (LBO) and polyacrylonitrile (PAN) co-polymers via electrospinning. During depolymerization , the addition of phosphotungstic acid (PTA) promoted the CSL catalytic conversion to some extent, the decrease of β-O-4 aryl ether bond, molecular weight (Mw) and polydispersity (PDI) was obvious. Compared with CSL, LBO can promotes the formation of uniform and smooth lignin-based nanofibers under high replacement rates condition and maintaining good morphology. Subsequent reactions between LBO and PAN fragments formed a better-integrated co-polymers structure containing linear PAN backbone. The Td of LBO-g-PAN was improved to 153 °C and the Tg was decreased to 96.5 °C. Rheological conclusions displayed that the viscosity of PAN/LBO/DMF was 0.082 Pa s, illustrating the polymer substance could be continuously spun into filament without causing degradation of the polymer substance. LBO-g-PAN also had high thermal stability, yielding of residual mass was 56.32 wt% at 700 °C.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·418
·
IF 3.164
Shuning Liu,Chenchen Liu,Changyu Liu,Ling Tu,Yong You,Renbo Wei,Xiaobo Liu
Barium titanate (BT) and polyarylene ether nitrile (PEN) nanocomposites with enhanced dielectric properties were obtained by using carboxylatedzinc phthalocyanine (ZnPc-COOH) buffer as the plasticizer. Carboxylated zinc phthalocyanine, prepared through hydrolyzing ZnPc in NaOH solution, reacted with the hydroxyl groups on the peripheral of hydrogen peroxide treated BT (BT-OH) yielding core-shell structured BT@ZnPc. Thermogravimetric analysis (TGA), transmission electron microscopy (TEM), TEM energy dispersive spectrometer mapping, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) demonstrated successful preparation of BT@ZnPc. The fabricated BT@ZnPc was incorporated into the PEN matrix through the solution casting method. Rheological measurements demonstrated that the ZnPc-COOH buffer can improve the compatibility between BT and PEN effectively. With the existence of the ZnPc-COOH buffer, the prepared BT@ZnPc/PEN nanocomposites exhibit a high dielectric constant of 5.94 and low dielectric loss (0.016 at 1000 Hz). BT@ZnPc/PEN dielectric composite films can be easily prepared, presenting great application prospects in the field of organic film capacitors.Keywords:barium titanate;polyarylene ether nitrile;zinc phthalocyanine;dielectrics;rheology
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）