COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Jiahao Zou,Huajun Duan,Yongsheng Chen,Sa Ji,Jianfan Cao,Huiru Ma
In order to improve the flame retardancy while maintaining the excellent mechanical properties and heat resistance of epoxy resin, a novel P/N/S-containing high efficiency flame retardant named TAP was designed and synthesized by a simple one-pot reaction among 2-thenaldehyde, 2-aminobenzothiazole (ABZ) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The chemical structure of TAP was characterized by Fourier transform infrared (FTIR) spectroscopy, 1 H and 31 P nuclear magnetic resonance (NMR) spectroscopy. Compared to pure EP, the introduction of TAP can reduce the thermal decomposition rate of epoxy resin and increase the char residue . Meantime, when the phosphorus content was only 0.48%, EP/7.5%TAP passed the vertical burning V-0 rating, obtaining a high flame-retardant efficiency. With the addition of 10 wt% TAP, the limiting oxygen index (LOI) value increased from 22.8% of pure EP to 31.5%, while the peak heat release rate (PHRR), total heat release (THR) and total smoke production (TSP) values decreased by 41.26%, 35.70% and 24.03%, respectively. In addition, the glass transition temperature (T g ) of the epoxy resin decreased from 185 °C to 177 °C, while the storage modulus at 30 °C increased. Subsequently, the flexural tests of the samples revealed that the mechanical properties were well maintained. All these results demonstrated that the TAP was a novel high efficiency flame retardant for EP, which enabled the cured EP to maintain excellent heat resistance and mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huizhen Sun,Xiuhua Chen,Shaoyuan Li,Wenhui Ma,Xiumin Chen,Dandan Wu,Kaixin Fu,Mingjun Xiao,Ming Wen
Developing efficient and selective recovery of Pd(II) adsorbents is crucial for addressing environmental pollution issues. Among them, covalent organic framework (COF) and metal organic framework (MOF) composites due to the multi-site functional groups are expected to exhibit excellent Pd(II) adsorption. However, the design and preparation of COF and MOF composite adsorbents for highly efficient adsorption of heavy metal Pd(II) still face many challenges. Herein, we constructed a series of novel core–shell structure UiO-66-NH 2 @TAP-COF (denoted as M@C) adsorbents (M@C-X, X = 1–5, representing different MOF doses) by Schiff base reaction and applied in the adsorption of Pd(II). The findings indicated that the M@C-3 exhibited ultra-high adsorption performance, reaching a capacity of 2134.1 mg/g, and displayed excellent selectivity, making it the best among similar materials. Experimental data and density functional theory (DFT) calculations revealed that the efficient and selective adsorption of Pd(II) is attributed to coordination interaction and strong electrostatic between Pd(II) and the abundant N and O groups in M@C. This work demonstrates the significant potential of the constructed core–shell M@C composites for the efficient and selective recovery of precious metal Pd(II).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Dawei Xiang,Manying Zhu,Yuefeng Chen,Shixing Wang,Zhengwu Peng,Dekun Zhang,Likang Fu
Gold is a widely used non-renewable resource, and its recycling is the key to solve the problem of dwindling gold resources. In this study, a novel covalent organic framework adsorbent (COF-pPDI@TAP) is developed for efficient Au(III) capture. The synthesis of the adsorbent was confirmed by FTIR and XRD characterization. The adsorption performance of COF-pPDI@TAP was studied by batch adsorption experiments. The maximum adsorption of Au(III) by COF-pPDI@TAP reached 779.02 mg/g in the adsorption experiments. Kinetic and isotherm results show that the adsorption is a monolayer chemisorption process controlled by particle diffusion. The positive value of ΔH indicates that COF-pPDI@TAP needs to absorb energy to maintain the reaction during the adsorption of Au(III), and the reaction is endothermic. In addition, COF-pPDI@TAP maintained a very high adsorption efficiency after five cycles of experiments, and could selectively capture Au(III) from different concentrations of polymetallic solutions. COF-pPDI@TAP has excellent anti-interference ability and good reusability. It is demonstrated by zeta potential, XRD, XPS and FT-IR that electrostatic interaction, chelation and reduction occurred during the adsorption process. These studies demonstrate the value of COF-pPDI@TAP for gold recovery applications.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
FUEL
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2018
·
IF 4.908
Qing-Qing Teng,Xian-Yong Wei,Yi-Bing Sun,Sheng-Kang Wang,Jing-Hui Lv,Zhan-Ku Li,Zhong-Qiu Liu,Zhi-Min Zong
Catalysts trifloromethanesulfonic acid (TFMSA)/treated attapulgite powder (TAP), Ni/TAP, and Ni-TFMSA/TAP with different Ni and TFMSA loadings were prepared. The typical catalysts were characterized with multiple instruments and used for catalyzing hydroconversion of di(1-naphthyl)methane (DNM), which was used as a coal-related model compound. The suitable loadings of Ni and TFMSA in Ni-TFMSA/TAP were determined to be 28.6% of Ni and 33% of TFMSA. Under optimal reaction conditions of 5 MPa of initial hydrogen pressure, 240 °C, and 4 h over Ni-TFMSA/TAP, DNM was completely converted, producing decalin and 1-methyldecalin as the main products. The result suggests that Ni-TFMSA/TAP is highly active for both cleaving the C ar -C alk bond in DNM and hydrogenating the resulting naphthalene and 1-methylnaphthalene under mild conditions. Based on the identification of reaction products, the catalytic mechanism for DNM hydroconversion was discussed.
研究领域:
催化化学
·
能源化学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Yu Li,Zeqian Wang,Baohong Guan
Microplastics pollution in freshwater has attracted global attentions, but when microplastics are broken into nanoplastics, they may present higher toxicity mainly due to their greater potential to cross biological membranes. So far almost no work has been done on the separation and identification of nanoplastics in tap water . Herein we removed large particles from tap water by 0.45 μm filter and then sequentially screened nanoparticles in filtrate by Anopore with pore size of 200, 100, and 20 nm, the most frequent particle sizes of which concentrate at 255 nm, 148 nm, and 58 nm, respectively. Based on characterization of FTIR , AFM-IR and Pyr-GC/MS, the polymers were identified to be polyolefins, polystyrene , polyvinyl chloride , polyamide, and some plastic additives. The abundance of nanoplastics with the most frequent particle sizes in range of 58–255 nm was 1.67–2.08 μg/L in tap water. This work provides a feasible method for separation and identification of nanoplastics in tap water, and manifests the existence of nanoplastics, which poses a potential threat to the health of residents.
研究领域:
环境科学
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分析化学
·
公共卫生
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2015
·Vol. 140
·期 15
·5220-5226
·
IF 4.107
Zhiwei Qie,Jialei Bai,Bin Xie,Lin Yuan,Nan Song,Yuan Peng,Xianjun Fan,Huanying Zhou,Fengchun Chen,Shuang Li,Baoan Ning,Zhixian Gao
A highly sensitive flow injection analysis (FIA)-based thermal enzyme-linked immunoassay, TELISA, was developed for the rapid detection of atrazine (ATZ) in tap water. ATZ and β-lactamase-labeled ATZ were employed in a competitive immunoassay using a monoclonal antibody (mAb). After the off-column liquid-phase competition, the mAb was captured on the Protein G Sepharose™ 4 Fast Flow (PGSFF) column support material. Injected β-lactamase substrate ampicillin was degraded by the column-bound ATZ–β-lactamase, generating a detectable heat signal. Several assay parameters were optimized, including substrate concentration, flow rates and regeneration conditions, as well as the mAb and ATZ-β dilution ratios and concentrations. The assay linear range was 0.73–4.83 ng mL−1 with a detection limit of 0.66 ng mL−1. An entire heat signal requires 10 min for generation, and the cycle time is less than 40 min. The results were reproducible and stable. ATZ-spiked tap water samples exhibited a recovery rate of 103%–116%, which correlated with the UHPLC–MS/MS measurements. We attributed this significant increase in sensitivity over our previously published work to the following factors: (i) the capture of already-formed immune complexes on the column via immobilized Protein G, which eliminated chemical immobilization of the antibody; (ii) off-column preincubation allows the formation of immune complexes under nearly ideal conditions; and (iii) multiple buffers can be used to, in one case, enhance immune-complex formation and in the other to maximize enzymatic activity. Furthermore, the scheme creates a universal assay platform in which sensing is performed in the off-column incubation and detection after capture in the enzyme thermistor (ET) detector, which opens up the possibility of detecting any antigen for which antibodies were available.
研究领域:
环境科学
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免疫学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Xinyang Zhang,Huilan Piao,Mengqing Cui,Xiangzi Jin,Meihui Tong,Donghao Li,Yilin Zou
Perfluorinated compounds (PFCs), characterized by their persistence and bioaccumulative properties, have been extensively detected across diverse environmental compartments, including aquatic systems, sediments, and organisms. These contaminants enter human bodies via food chain transfer, subsequently undergoing internal transport and metabolic transformation. Meanwhile, the detection of samples is also difficult to achieve sensitivity analysis due to the low content of the analytes and the complex matrix. Based on this, we propose a novel approach for analyzing the derivatives of 9 PFCs (derivatization reaction conditions: 1 min, room temperature) in tap water using carbon nanofibers/carbon fibers (CNFs/CFs) nanoconfined solvent extraction method, termed nanoconfined liquid phase nanoextraction (NLPNE), coupled with gas chromatography-mass spectrometry (GC-MS). The effect of various experimental parameters on extraction efficiency was investigated using a Box-Behnken design (BBD), such as volume of nanoconfined solvent, extraction time and desorption time, which method requires a less solvent-consumption (20 μL) and time ≤ 1 min, meeting the requirements for green environmental and sustainable development. Under optimal conditions, the developed method shown good linearity within the studied concentration range. Accuracy was evaluated by analyzing the extraction recovery of spiked tap water sample, the satisfactory recoveries (71.31%-126.15%) with RSD ≤ 17.45%. In addition, the limits of detection (LODs) for the analytes were in the range of 0.2-3 μg L −1 , which the sensitivity has been significantly improved. Considering the versatility of nanoconfined solvent extraction method, indicated that the NLPNE is a promising pretreatment technique for detecting PFCs in real samples.
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Peilu Zhai,Yeming Shen,Pengxuan Xi,Minghuo Wu,Xinping Wu,Li Li,Wanxue Cao,Yu Ke,Jianye Zhang
Phenylalanine (Phe) is widely present in natural water and serves as a precursor of disinfection by-products (DBPs). We reported the identification of chloramination DBPs from Phe in drinking water using ultra-high performance liquid chromatography (UHPLC) coupled with complementary high-resolution quadrupole time-of-flight (QTOF) and triple quadrupole (tQ) tandem mass spectrometry (MS/MS). In the chloraminated Phe water solution, sixteen new DBPs in a total of seventeen were identified based on their accurate mass, MS/MS spectra and 35 Cl/ 37 Cl isotopic patterns. Three of these DBPs were verified as benzamide, phenylacetamide, and p -hydroxyphenylacetamide with their standards, while the others were chlorinated derivatives of Phe, hydrazone, amidine, amide and peroxide, in which the unique structures of these DBPs were rarely reported. Their stability and formation process were investigated as well. Furthermore, a method consisting of solid phase extraction (SPE) and UHPLC-MS/MS using dynamic multiple reaction monitoring (dMRM) was developed to investigate these DBPs in authentic waters. Phe, benzamide, phenylacetamide, and N –Cl-2-phenylacetimidamide were detected in chlorinated tap water . Compared with the other identified DBPs, these three DBPs were exceptionally stable and could be formed in wide formation conditions. Our work not only provided ideas for the identification of new chloramination DBPs, but also demonstrated that some DBPs usually generated in the chloramination disinfection process could also be found in the chlorinated drinking water.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
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2020
·
IF 0.992
Hao Zhang,Juan Wei,Zongli Huo
A simple and rapid method employing ultra-high performance liquid chromatography tandem mass spectrometry has been developed for the direct determination of acrylic acid in tap water for the first time. The method worked on a ultra-high-performance liquid chromatography system and utilized the direct injection of 10 μL volumes. Aqueous samples were filtered with 0.22 μm membrane after diluting with the acetonitrile without any further pretreatment. The separation was accomplished by using a HILIC column with a gradient elution program. Acetonitrile and ammonium acetate solution (pH = 7) were applied in the method as the mobile phase. Acrylic acid- d3 was used as the internal standard in the quantification process. The method provided good recovery from 102.8% to 104.4%, good precision with intraday relative standard deviations in a range of 2.3% and 5.1%. The limit of quantification for the method was 45 μg/L. The possible structures of qualitative ion and quantitative ion of acrylic acid were proposed in this work with the help of the product ion spectra of acrylic acid and its corresponding isotopic standards. This study provided a reliable and quantitative method that could be used for daily monitoring of water quality.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Methods and Applications in Fluorescence
·
2020
·Vol. 8
·期 2
·025005
·
IF 2.8
Zhikun Gao,Yu Luan,Yunfei Cao,Jialin Li,Yi Lu,Tianshu Liu,Ningwei Wang,Zhiping Zhou,Weihong Huang,Wanzhen Xu
An eco-friendly fluorescence polymer nanoparticle based on carbon quantum dots and poly(methyl methacrylate) nanoparticles is successfully fabricated to detect sulfadiazine. By making use of the abundant functional group of carbon quantum dots and poly(methyl methacrylate) nanoparticles, without any extra modification, the synthetic process of the fluorescence nanoparticles is reduced and the unnecessary chemical molecules are avoided being brought into the reaction system. The investigation of the fluorescence property of carbon quantum dots shows that the prepared carbon quantum dots are the excitation independent. In addition, the morphology of the synthesized fluorescence polymer nanoparticle is tested by the scanning electron microscope and shows that the fluorescence sensor possesses a good spherical core–shell structure. Moreover, under the optimized condition, the prepared fluorescence polymer nanoparticle possesses a good selectivity in the detection of sulfadiazine under a mixture solution. Moreover, the limit of detection is 4 μmol.l−1 within the detective range from 10 μmol.l−1 to 60 μmol.l−1. Meanwhile, the fluorescence quenching mechanism is considered with the photoinduced electron transfer mechanism. Finally, the practical research on the detection of sulfadiazine in tap water shows that the recovery range and relative standard deviation are 97.5% − 105.1% and 2.1%–4.5%, respectively.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Jiaxin Yang,Yang Qiu,Junyuan Liang,Yanhui Wang,Jun Zhou,Zhaoyang Wu
To address the urgent need for on-site and rapid detection of uranyl ions (UO 2 2+ ), we developed a visual sensing platform based on the structural color of a lamellar photonic crystal. A periodic lamellar structure was fabricated via surfactant-directed self-assembly of dodecyl glyceryl itaconate (DGI) and subsequently immobilized in a polyacrylamide (PAAm) network, yielding an anisotropic, amidoxime-functionalized h-PAO-PDGI/PAAm hydrogel. The hydrogel exhibited an equilibrium swelling ratio of 2296% and excellent mechanical properties, with a tensile strength of 0.014 MPa and elongation at break of 281.21%. It contains abundant amidoxime, carboxyl, and amide groups that serve as specific binding sites for UO 2 2+ coordination. Binding of UO 2 2+ induces hydrogel shrinkage, decreasing the interlayer spacing and causing a blueshift of the diffraction peak. This blueshift shifts the structural color from red to blue within 25 min. The sensor exhibits a linear response to UO 2 2+ in the 0.01–100 μM range, with a detection limit of 9.7 nM. Featuring instrument-free operation, visual readout, and good reusability, this sensor provides a promising approach for on-site monitoring and pollution control of UO 2 2+ in environmental waters.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 4
·3393-3398
·
IF 3.84
Yusheng Yuan,Xin Huang,Shaopu Liu,Jidong Yang,Ruilin Duan,Xiaoli Hu
In neutral conditions, hypochlorite-assisted oxidative conversion of 1-pyrenylboronic acid into 1-hydroxypyrene, which leads to 1-pyrenylboronic acid fluorescence quenching, was used as the signaling tool. Compared with 1-pyrenylboronic acid, the maximum excitation (λex = 347 nm) and emission (λem = 392 nm) wavelength of 1-hydroxypyrene had no obvious change. The surfactant Triton X-100, as a micellar additive, was not only used to enhance the stability of the fluorescence probe, but also to improve its sensitivity. When using Triton X-100, the signaling of 1-pyrenylboronic acid was markedly enhanced. Herein, a spectrofluorimetric method for highly selective and sensitive hypochlorite determination has been performed. It can be noted that the fluorescence intensities positively correlated with the hypochlorite concentration over the range of 0.69–6.0 μmol L−1. The detection limit was 0.21 μmol L−1, which is lower than for most of the recently published methods. The experimental conditions were optimized and the effects of coexisting substances are evaluated. The results showed excellent priority because a certain amount of ions, including SO32−, NH4+, Cu2+ and other acid radicals, would not interfere with the measurement. The accuracy and reliability of the method was further ensured by recovery studies using the standard-addition method. In addition, the quenching mechanism, which was proven to be static quenching, has been investigated systematically by the linear plots at varying temperatures based on the Stern–Volmer equation, fluorescence lifetime, and UV-visible absorbance spectra. This method was finally used to detect hypochlorite in local water samples.
研究领域:
分析化学
·
环境监测
·
荧光传感
·
水质分析
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DOI
高影响因子
危险品化学品经营许可证（带存储）