JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Lei Yu,Jing-qiu Hua,Hong-cheng Fan,Oduro George,Yan Lu
High cost is one of the limiting factors in the industrial production of bioflocculant. Simultaneous preparation of bioflocculant from the contaminants in wastewater was considered as a potential approach to reduce the production cost. In this study, butyronitrile and succinonitrile were verified as sole nitrogen sources for the growth of strain K. oxytoca GS-4-08 in batch experiments. Moreover, more than 90 % of the mixed nitriles could be degraded in a continuous flow reactor, and the bioflocculant could be prepared simultaneously in the effluent. All the as-prepared bioflocculants exhibited high flocculation efficiencies of over 90 % toward Kaolin solution. FTIR and XPS results further unveiled that, the bioflocculant samples with abundance of carboxyl, amine and hydroxyl groups may play an important role on adsorption of Pd 2+ . The adsorption process could be well simulated by Freundlich model, and the K f values were as high as 452.8 mg 1−1/n l 1/n g -1 . The results obtained in this study not only confirm the technical feasibility for preparation of bioflocculant from various single nitrile and/or mixed nitriles, but also promise its economic feasibility.
研究领域:
环境工程
·
微生物学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yuhang Jiao,Huijie Yan,Qingxin Meng,Shiling Jia,Shuang Liu,Huixuan Zhang,Zhongyu Fu
For the first time, a new polymerization medium, dimethyl carbonate (DMC), was used for the polymerization of acrylonitrile (AN), and polyacrylonitrile (PAN) powder was obtained successfully. The effects of polymerization factors, including monomer concentrations, temperature and initiator concentrations on the structures and properties of PAN powders were investigated by nuclear magnetic resonance spectroscopy (NMR), total internal reflectance Fourier transform infrared spectrometer (FTIR), wide-angle X-ray diffractometer (WXRD) and thermal gravimetric analyzer (TGA). The polymerization kinetic and mechanistic study of PAN with DMC as the polymerization medium were discussed in details. There are three key achievements in this paper. First, the kinetic equation of PAN polymerization with DMC as a medium was established: R p = K [ ABVN ] 0.92 [ AN ] 6.78 . This result shows that the R p is highly dependent on the AN concentrations. Second, the chain transfer constant of DMC was measured to be 4.57 × 10 −4 at 60 °C, and the chain transfer constant increases with polymerization temperature. Lastly, the structures and properties of PAN powders prepared with H 2 O, tetrahydrofuran (THF) and DMC as media were compared. The results showed that the PAN prepared with DMC as a medium by free radical polymerization had a higher conversion, molecular weight and better crystalline property compared to THF. These findings indicate that DMC is a promising medium for manufacturing high quality PAN powder by free radical polymerization.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 3
·1299-1311
·
IF 3.2
Gang Ma,Xingzhong Fang,Guofei Chen
Aromatic nucleophilic substitution polymerization was used to synthesize five poly(ether nitrile imide)s (PENIs) that include benzonitrile and bulky cardo groups from a mixture of phenolphthalein (PP), 4,4′-bis(4-fluorophthalimide) diphenyl ether (4,4′-BFPI), and 2,6-difluorobenzonitrile (DFBN). The structure and properties relationship of PENIs with different ratios of DFBN and 4,4′-BFPI was explored. It was found that the glass transition temperature ( T g ) of PENIs decreased from 280 to 260°C, while the temperature of 5% thermal weight loss ( T 5% ) in N 2 increased from 429 to 453°C as the benzonitrile content in PENI increased. The produced PENI films had good mechanical characteristics, including tensile strengths of 103–112 MPa, elongations at break of 5.6%–8.2%, and tensile moduli of 2.9–3.4 GPa. Furthermore, the solubility and melt processability were also improved with the introduction of the benzonitrile group. Compared with poly(ether ketone imide)s (PEKIs) and poly(ether sulfone imide)s (PESIs), PENIs with benzonitrile displayed higher T g , tensile modules, and lower complex viscosity.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
·
2021
·Vol. 41
·期 1
·230-239
·
IF 3.742
Siqi Wu,Huizhen Li,Jing You
Fipronil has been frequently detected in waterways worldwide at concentrations that threaten aquatic organisms, yet the metabolic behavior of fipronil enantiomers in aquatic organisms is largely unknown, which is of significance in enantioselective toxicity evaluation. We quantitatively identified the specific cytochrome P450 (CYP) isozymes involved in metabolizing fipronil enantiomers in tilapia by combining in vitro metabolic kinetic assays and molecular docking. Inhibition studies suggested that CYP1A enzyme was the main isoform catalyzing metabolism of fipronil and that CYP3A contributed in a limited way to the metabolism in fish liver S9. Both the dissipation rate constant and the maximum metabolic velocity of R -(−)-fipronil were greater than those of S -(+)-fipronil in tilapia liver S9, suggesting that tilapia selectively metabolized R -(−)-fipronil. The CYP1A1 isozyme exhibited the highest binding capacity to R -(−)-fipronil and S -(+)-fipronil (binding energy ‒9.39 and ‒9.17 kcal/mol, respectively), followed by CYP1A2 (‒7.30 and ‒6.94 kcal/mol, respectively) and CYP3A4 (‒7.16 and ‒6.91 kcal/mol, respectively). The results of in vitro metabolic assays and molecular docking were consistent, that is, CYP1A, specifically CYP1A1, exhibited a higher metabolic capacity to fipronil than CYP3A, and fish liver S9 selectively metabolized R -(−)-fipronil. The present study provides insight into the enantioselective metabolic behavior and toxicological implications of the in vitro metabolic kinetics of fipronil in fish. Environ Toxicol Chem 2022;41:230–239. © 2021 SETAC
研究领域:
环境毒理学
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水生毒理学
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药理学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
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2024
·
IF 1.8
Xuhai Xiong,Lei Yao,Rong Ren,Donghui Liu,Na Li
A new series of high-temperature resistant bisphthalonitrile resins containing trifluoromethyl groups were prepared based on 4,4’-(hexafluoroisopropylidene) bisphthalonitrile (BFPh), which was toughened by hexafluoroisopropylidene-containing poly (aryl ether nitrile) oligomer capped by phthalonitrile (FPEN-Ph) in the different content. In addition, glass fiber reinforced composites were prepared by hot pressing process. The structure of the oligomer was characterized by FTIR and 1HNMR. The curing behavior of the blends was studied by DSC. Thermal stability and mechanical properties were also studied. The results showed that the introduction of appropriate content of FPEN-Ph could improve the reactivity of the curing reaction. TGA and DMA results showed that the cured polymers and composites had excellent thermal properties. The residual mass of FPEN-Ph content of 10% at 800°C was 72.4%, and the 5% thermal degradation temperature (T5%) under inert atmosphere was 530°C. The flexural strength of glass fiber reinforced composites was about 592.7 MPa, and the shear strength was about 61.6 MPa, showing excellent mechanical properties. The high-tech thermosetting resin was toughened and enhanced at the same time without reducing heat resistance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yehong Han,Ruiyang Ma,Juntao Wang,Hongyuan Yan,Yufei Shan,Zihan Liu,Zhi Wang
In this study, for the effective determination of fipronil and ethiprole residues in milk, a new analytical approach, which was based on a tip solid-phase extraction (TSPE) by using a newly prepared ternary deep eutectic solvent-functionalized UiO-66 (TDES@UiO-66) as the adsorbent and HPLC-UV detection, was developed. The method integrated the advantages of both the high adsorption capability of the TDES@UiO-66 and the high efficiency of the TSPE, and enabled a rapid extraction of fipronil and ethiprole from milk samples within 8 min by utilizing only 3.0 mg of TDES@UiO-66 adsorbent. The developed method demonstrated an excellent analytical performance, including good linearity (linear rang: 0.02–10 μg/mL; r : 0.9990–0.9997), high precision (relative standard deviations: ≤ 9.9 %), good accuracy (recoveries: 91.1 %–109.8 %), and good sensitivity (limits of quantification: 0.011–0.018 μg/mL). This study provides a rapid and practical approach for the detection of fipronil and ethiprole in different milk samples.
研究领域:
分析化学
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食品安全
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药物残留检测
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材料科学
·
色谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 25
·50585
·
IF 3.125
Pengcheng Li,Dawei Yan,Lin Luo,Wanli Tang,Haohao Ren,Yonggang Yan
A series of poly(arylene ether nitrile) copolymers (PENAPs) were synthesized with bisphenol A (BP-A), bisphenol AP (BP-AP) and 2,6-Dichlorobenzonitrile (DCBN) via a nucleophilic substitution polycondensation reaction. FTIR and 1 H-NMR were used to confirm the structure of PENAPs. Glass transition temperature ( T g ) of PENAPs determined by differential scanning calorimetry (DSC) ranged from 154.2 to 200.8°C. The 5% weight lost temperature ( T 5% ) of PENAPs were 418.9–447.7°C. The tensile and DMA test indicated that PENAPs possessed excellent mechanical properties with tensile strength more than 92.8 MPa and storage modulus more than 1.0 GPa at about 150°C. The melt flowability was measured by rheology properties testing ranging from 80 to 1639 GPa at 290°C and under shear frequency 100 Hz, which indicated the copolymers had good flowability and thermal stability. Additionally, PENAPs could be dissolved in many solutions, which meant PENAPs had good solubility and can be processed by solution method.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Kaikai Liu,Tiefeng Wang,Minghan Han
The catalytic isomerization of 2-methyl-3-butenenitrile (2M3BN), a model reaction in the DuPont process, has been performed using NiL 4 (L=tri- O - p -tolyl phosphite) as a catalyst. The lowered catalytic activity in the isomerization with coexistence of 2-pentenenitrile (2PN) and 2-methyl-2-butenenitrile (2M2BN) indicates that both 2PN and 2M2BN are the catalyst inhibitors , and the quantitative relationship between the conversion of 2M3BN and the content of 2M2BN and 2PN is provided. DFT calculation results suggest that the inhibition effect is attributed to the generation of dead-end intermediates (2PN)NiL 2 and (2M2BN)NiL 2 , both of which take nickel atom out of the catalytic cycle in the isomerization process. To suppress the inhibition effect, new catalytic intermediates are rationally designed based on their computational %V bur . An efficient method that adding extra ligand 1, 5-bis(diphenylphosphino)pentane (dppp5) to the NiL 4 catalyst is selected experimentally. Compared to the results obtained with NiL 4 as catalyst, the (dppp5)NiL 2 increases the conversion of 2M3BN from 74.5 % to 93.4 % at 3 h of reaction and provides a high selectivity to 3PN (> 98 %) at optimal conditions.
研究领域:
催化
·
有机化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Chunyan Li,Zhenlei Yue,Fengzhao Feng,Chuanwu Xi,Hailian Zang,Xuejiao An,Keran Liu
There is a great need for efficient acetonitrile removal technology in wastewater treatment to reduce the discharge of this pollutant in untreated wastewater. In this study, a nitrilase gene ( nit ) isolated from a nitrile-degrading bacterium ( Rhodococcus rhodochrous BX2) was cloned and transformed into a biofilm-forming bacterium ( Bacillus subtilis N4) that expressed the recombinant protein upon isopropylthio-β-galactoside (IPTG) induction. The recombinant bacterium ( B. subtilis N4-pHT01- nit ) formed strong biofilms and had nitrile-degrading capability. Further testing demonstrated that biofilms formed by B. subtilis N4-pHT01- nit were highly resistant to loading shock from acetonitrile and almost completely degraded the initial concentration of acetonitrile (800 mg L −1 ) within 24 h in a moving bed biofilm reactor (MBBR) after operation for 35 d. The bacterial composition of the biofilm, identified by high-throughput sequencing, in a reactor in which the B. subtilis N4-pHT01- nit bacterium was introduced indicated that the engineered bacterium was successfully immobilized in the reactor and became dominant genus. This work demonstrates that an engineered bacterium with nitrile-degrading and biofilm-forming capacity can improve the degradation of contaminants in wastewater. This approach offers a novel strategy for enhancing the biological oxidation of toxic pollutants in wastewater.
研究领域:
环境工程
·
微生物学
·
生物技术
·
污水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lei Yuan,Leihao Zhang,Guilin Li,Shaojuan Zeng,Qizhou Xue,Chongyang Jiang,Xiangping Zhang
Electric-driven reduction of CO2 to high value-added chemicals is considered to be one of the most promising methods for CO2 utilization. In this work, a novel aprotic electrolyte consisting of phenoxy-nitrile bifunctional ionic liquid ([TBP][p-CN-PhO]) and acetonitrile was designed for CO2 electroreduction to oxalate, which shows the maximum Faradaic efficiency (FE) of 84.9% at −2.6 V. Importantly, a high oxalate formation rate of 233.7 μmol·cm–2·h–1 and oxalate FE of 73.9% were simultaneously achieved to break the trade-off effect at −2.8 V in the bifunctional ionic liquid electrolyte, which is also one of the state-of-the-art performances for CO2 electroreduction to oxalate. The significant performance of CO2 electroreduction was attributed to the strong interaction energies of phenoxy and nitrile groups with CO2 molecules in the bifunctional ionic liquid, which greatly facilitates CO2 activation to form CO2– radicals by a new bulk-phase pathway and then dimerizes into C2O42– at a lower energy barrier.
研究领域:
化学
·
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2017
·
IF 1.139
Yazhen Wang,Yutao Di,Shaobo Dong,Zijian He,Xueze Zhang,Jia Shi,Tianyu Lan
(3-(tert-butylperoxy)propyl) trimethoxysilane (TBPT), is a tailor-made new style silane coupling agent with peroxide group, which have ability of initiating polymerization. This study used TBPT to generate free radical, and initiated the polymerization of acrylonitrile (AN), thereby forming polyacrylonitrile (PAN) in two approaches, thermal initiation system and redox initiation system. Meanwhile this study bonded TBPT onto nano-TiO2 to get modified nano-TiO2 by means of the coupling function of TBPT, and then made the peroxide group of the modified nano-TiO2 decompose and initiate the polymerization of AN in thermal initiation system and redox initiation system respectively. The products were investigated and analyzed by FTIR, XPS and TG. The result showed that on one hand, in the products of the thermal initiation there was PAN, which both attached and unattached to the modified nano-TiO2; on the other hand, in the products of the redox initiation system the PAN unattached to the modified nano-TiO2 was produced, while the PAN attached to the modified nano-TiO2 was not.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2018
·
IF 0.668
Xiaoyun Ma,Daqin He,Zhengjian Chen
A simple method for the preparation of nitriles in moderate to good yield has been achieved by treatment of aromatic and heterocyclic aldoximes with malononitrile in water at reflux in the presence of copper acetate as catalyst. Arylaldoximes with an electron-donating group showed the highest reactivity, their conversion being achievable at room temperature.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）