CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiahao Dong,Yan Kang,Shaoping Kuang,Haoqin Ma,Mei Li,Jingqian Xiao,Yafei Wang,Zizhang Guo,Haiming Wu
Microplastics, as emerging pollutants, can adsorb polycyclic aromatic hydrocarbons (PAHs) in aqueous environments. However, the coeffects of PAHs and microplastics on aquatic organisms are vague. In this study, nanoscale and micron-scale microplastics (30 mg/kg) and phenanthrene (10 mg/kg) were added to aquatic sediment to explore the effects of different particle sizes of microplastics and typical PAHs on invertebrates ( Tubifex tubifex ) and microbes after 28 days operation. The fluorescence signal of fluorescently labelled micron-scale and nanoscale microplastics were detected in T. tubife x, especially nanoscale microplastics. The reduced activities of CAT, GST, SOD and MDA in T. tubifex suggested that the micron-sized microplastics and PAHs exacerbated the oxidative damage to T. tubif ex. Microbial analysis confirmed that microplastics and PAHs decreased the abundance of Proteobacteria , Fusobacteriota and Bacteroidetes in the gut of T. tubifex and thereby affected the degradation of phenanthrene. Microplastics also reduced the abundance of Bacteroidetes , Acidobacteria and Proteobacteria in sediment. The abundance of salicylate hydroxylase enzyme that related to PAHs metabolism was increased with the addition of phenanthrene. The results in this study would be useful for further risk assessment of PAHs and microplastics in aquatic environments.
研究领域:
环境科学
·
水生毒理学
·
微生物学
·
生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2014
·
IF 2.212
Xiao-Li Tang,Ai-Qing Ma,Guo-Qiang Cai,Long-Guan Zhu
Three complexes with same components, PdII, 2-sulfobenzoate and 1,10-phenanthroline, [Pd(phen)2]⋅2(2-Hsb) (1), [Pd(phen)2](2-Hsb)⋅(2-Hsb)⋅2H2O (2), and [Pd(phen)2]⋅[Pd(phen)(2-sb)2]⋅6H2O (3), where 2-H2sb is 2-sulfobenzoic acid and phen is 1,10-phenanthroline, were synthesized and characterized by IR spectra, elemental analyses, thermogravimetric analyses, UV–vis absorption spectra and powder X-ray analysis. Single X-ray crystal structural analyses showed that 1 and 2 are ionic species, while 3 is a dimer through weak bonding interactions. In 1 and 2, 2-Hsb− ligands are partly deprotonated and it is fully deprotonated in 3. In 2 and 3 there are hydrogen bonds and π–π interactions. Extended hydrogen bonding structures for 2 and 3 are 1-D and 3-D architectures, respectively. The oxidation of methyl phenyl sulfide by 1-3 as homogeneous catalysts gave high conversion and selectivity in methanol. The addition of 2-sulfobenzoic acid in the catalytic reaction further promotes the conversion.
研究领域:
化学
·
材料科学
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DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 11
·e17831
·
IF 4.167
Chong Peng,Peng Liu,Zhiming Zhou,Xiangchen Fang,Yun-Xiang Pan
Phenanthrene hydrogenation is a key reaction for improving the quality of gasoline and diesel. Herein, we conduct detailed thermodynamic and kinetic analyses for phenanthrene hydrogenation on a Ni-Mo/HY catalyst. We establish a comprehensive reaction network for phenanthrene hydrogenation, and calculate equilibrium constant, rate constant, adsorption constant, activation energy barrier, and reaction energy for each step in the reaction network. All of the steps in the reaction network are revealed to be exothermic. A kinetic model with 28 parameters is constructed for phenanthrene hydrogenation. The deviation of the product yields calculated by the kinetic model from those obtained in experiments is less than 4.5%, indicating the reasonability and accuracy of the kinetic model. The most favorable pathway for phenanthrene hydrogenation is demonstrated to be phenanthrene → tetrahydrophenanthrene → sym-octahydrophenanthrene → 5,6-butyl-tetrahydronaphthalene → tetralin. These results are helpful for efficiently tuning catalyst properties and optimizing reaction conditions for enhancing phenanthrene hydrogenation.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2020
·Vol. 93
·期 11
·1393-1400
·
IF 4.488
Mool-am-kha Pijika,Themsirimongkon Suwaphid,Saipanya Surin,Saianand Gopalan,Tuantranont Adisorn,Karuwan Chanpen,Jakmunee Jaroon
The design and development of facile, rapid, selective, and sensitive electroanalytical methods for the simultaneous determination of serotonin (ST) along with other interfering species are in huge demand. To address this, herein, we report an efficient electrochemical sensing platform for the individual and simultaneous determination of ST and dopamine (DA) in human serum. The sensing system was judicially constructed by hybrid electrocatalytic nanocomposites composed of carbon nanotubes/nickel oxide/carbon black/Nafion modified screen-printed carbon electrode (CNT-NiO-CB/Nafion/SPCE). The structural, morphological, and electrochemical properties of the as-synthesized/fabricated materials and electrodes were thoroughly analyzed through appropriate instrumentations (scanning/transmission electron microscopy, electron microscopy, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, etc.). Besides, the experimental parameters of electrochemical measurements, such as varying amounts (CNT-NiO-CB/Nafion), pH, conditioning potential, time, modulation amplitude, and step potential, have been carefully optimized. The as-fabricated newly designed sensor exhibits superior analytical performance such as wide linear range (0.06–7.50 µM ST and 0.08–6.00 µM DA), low limit detection of (11 nM ST and 11 nM DA), high reproducibility (RSD = 5.74% ST and 7.74% DA) indicating excellent selectivity, stability, sensitivity along with good recovery range.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 2
·1399-1405
·
IF 1.395
Jiajie Wu,Jiachun Feng
A novel hindered amine ligand, mono-2,2,6,6-tetramethyl-4-piperidyl-succinate (MTPS), has been designed to chelate europium(III) ion with 1,10-phenanthroline (Phen) as a coligand to prepare polymer photostabilizer. The luminescent property of the stabilizer and its efficiency of protecting polymer matrix from photodegradation have also been investigated. Under UV excitation, the stabilizer has red light emission in both ethanol solution and polypropylene (PP) matrix. The PP sheets containing the stabilizer display significantly improved photostability, which may be attributed to MTPS which scavenges radical, as well as Phen which makes the complex dissipate the absorbed ultraviolet light in a harmless manner. These preliminary results demonstrate that the introduction of the stabilizer can endow polymer matrices not only excellent photoluminescent properties but also improved photostability. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1399-1405, 2013
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 9
·2655
·
IF 3.5
Zhengying Guo,Peng Xu,Shiqing Zhou,Ruoxi Wu
Excessive levels of heavy metal pollutants in the environment pose significant threats to human health and ecosystem stability. Consequently, the accurate and rapid detection of heavy metal ions is critically important. A AgNPs@CeO2/Nafion composite was prepared by dispersing nano-ceria (CeO2) in a Nafion solution and incorporating silver nanoparticles (AgNPs). The morphology, microstructure, and electrochemical properties of the modified electrode materials were systematically characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and cyclic voltammetry (CV). By leveraging the oxygen vacancies and high electron transfer efficiency of CeO2, the strong adsorption capacity of Nafion, and the superior conductivity of AgNPs, an AgNPs@CeO2/Nafion/GCE electrochemical sensor was developed. Under optimized conditions, trace Pb2+in water was detected using square wave anodic stripping voltammetry (SWASV). The sensor demonstrated a linear response for Pb2+within the concentration range of 1–100 μg·L−1, with a detection limit of 0.17 μg·L−1(S/N = 3). When applied to real water samples, the method achieved recovery rates between 93.7% and 110.3%, validating its reliability and practical applicability.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Phytochemistry Letters
·
2021
·
IF 1.679
Jinhua Li,Ziqi Yan,Hongmei Li,Qiong Shi,Linfang Huang,Naganna Nimishetti,Thaddeus D. Allen,Dun Yang,Jing Zhang
Natural sources are a valuable reserve of chemical diversity for drug development. However, creative screening assays are required to unlock this potential. A high-content screen was developed to isolate anti-mitotic and polyploidy-inducing activity in mammalian cancer cells from plant extracts. The assay was utilized in an analysis of more than 2000 medicinal plants and activity was identified in a rhizome extract from Corydalis longicalcarata . Two bioactive benzophenanthridine alkaloids, corynoline and its close analog acetylcorynoline, were purified. These compounds display pleiotropic effects on cell division, including prevention of chromosome congression, compromise of the spindle checkpoint response, and blockade of cytokinesis. Corynoline and acetylcorynoline are known entities but the potential for development as anti-mitotic drugs has never been ascribed to these two phytochemicals. This study highlights the requirement and ability of novel bioassays to unlock novel function for known phytochemicals.
研究领域:
药理学
·
植物化学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2013
·Vol. 60
·期 8
·1019-1026
·
IF 0.879
Fei Wang,Xiang Yu,Haojie Li,Ming Li,Qimin Feng
A simple but highly snesitive electrochemical sensor for the determination of dihydromyricetin (DMY) based on graphene-Nafion nanocomposite film modified Glassy carbon electrode (GCE) was reported. The characteristic of the sensor was examined by scanning electron microscopic (SEM) and electrochemical impedance spectroscopy (EIS). Compares with bare GCE, pre-anodized glassy carbon electrode (GCE(ox)) and Nafion modified electrode, the sensor exhibited the more superior ability of detecting DMY, due to the synergetic graphene and Nafion. Other, the dependence of the current on pH, instrumental parameters, accumulation time and potential were investigated to optimize the experimental conditions in the determination of DMY. Under the selected conditions, the response peak currents were linear relationship with the DMY concentrations in the range of 8.0 × 10 −8 ∼ 2.0 × 10 −5 mol L −1 with a detection limit of 2.0 × 10 −8 mol L −1 . And, the method was also applied successfully to detect DMY in Ampelopsis grossedentata samples.
研究领域:
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yongxin Wu,Yi Yang,Yongze Liu,Liqiu Zhang,Li Feng
The degradation rates of pharmaceuticals contaminants (such as bezafibrate and carbamazepine) in the UV/S 2 O 8 2− process at different Cl − concentrations (0.01, 0.1, 1.0, 10, and 100 mM) and pH values (3, 5, 7, 9 and 11) were investigated in this study. The degradation rate of bezafibrate showed an upward trend before the critical point (Cl − = 1.0 mM), the maximum enhancement was 51%, then the degradation rate decreased. The degradation rate of carbamazepine increased continuously, and the maximum enhancement was 66% when the Cl − concentration was 100 mM. The degradation rate of bezafibrate showed the maximum value at pH = 7 while the most rapid degradation rate of carbamazepine was observed at pH = 3. To explain these interesting results, a kinetic model was used to investigate the conversion of reactive radicals (such as SO 4 − , OH , Cl , and Cl 2 − ) at different Cl − concentrations and pH values. Simulation results showed that low concentrations (<1.0 mM) of Cl − transformed SO 4 − into OH and Cl . With the further increased concentration of Cl − from 1.0 mM to 100 mM, OH and Cl can be converted into Cl 2 − . Furthermore, Cl 2 − was the dominant reactive species when pH < 7, whereas OH dominated when pH > 7. Few organic chlorinated products were observed in the UV/S 2 O 8 2− /Cl − process, indicating that the reactions between bezafibrate/carbamazepine and the reactive chlorine radicals Cl /Cl 2 − occurred mainly through electron transfer and H-extraction, whereas the substitution reaction leading to the formation of organic chlorinated products was not dominated. This study positively demonstrated the absence of chlorinated product formation during SR-AOPs application.
研究领域:
环境科学
·
化学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Heng Zhang,Xin Gao,Keli Chen,Hui Li,Lincai Peng
In current study, cellouronic acid sodium (CAS), obtained from bagasse pith, has been introduced into poly(acrylamide-co-diallyldimethylammonium chloride) (poly(AM-co-DAC)) network to form novel thermo-sensitive semi-IPNs. The structure and morphology of the hydrogels were proved by Fourier transformation infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The effects of CAS content, initiator charge, cross-linker dosage and swelling-medium property on the thermo-responsive water absorptivity were investigated in detail. The results elucidated that the prepared gels exhibited a thermo-sensibility with an upper critical solution temperature (UCST) and a high water-absorbency. And the values of UCST and equilibrium swelling ratio largely depended on the inner structure of the semi-IPNs and the external solvent property. It was also revealed that the swelling process conformed to the Schott’s pseudo second order model and diffusion type was non-Fickian diffusion. The value of activation energy for this polyelectrolyte was found to be 8.74 kJ/mol.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 9
·5638-5648
·
IF 4.186
Daixiong Zhang,Qing Xiang
Nafion is suggested as an efficient assistant in preparing supercapacitor by employing nanoparticles. In this work, using a bi-additive of 0.10-mM NaOH + 0.10 g L −1 Nafion, Nafion-assisted electrophoretic co-deposition of Bi 2 O 3 –multiwalled carbon nanotubes (MWCNTs) coating is successfully realized in ethanol solvent. The capacitance performances of the electrophoretic coatings in 6.0-M KOH electrolyte are investigated by cyclic voltammetry and galvanostatic charge–discharge techniques. Comparing with Bi 2 O 3 coating prepared with electrophoretic deposition (EPD) by employing other additive (such as polyethyleneimine), the Bi 2 O 3 coating prepared by Nafion-assisted EPD shows a better capacitance performance. Benefiting from the improvement in coating conductivity caused by MWCNTs, with a small additional amount of 4.0 wt.%, the Bi 2 O 3 –MWCNTs coating exhibits an amazing 164% increase of mass-specific capacitance (473 F g −1 at the current density of 1.0 A g −1 ) in comparison with pure Bi 2 O 3 coating (179 F g −1 at the current density of 1.0 A g −1 ). The cyclic stability test exhibits excellent capacitance retention of 88.7% over 3000 cycles at a constant current density of 10.0 A g −1 . This work combines the advantages of MWCNTs, Nafion, and EPD to provide a facile route for preparing Bi 2 O 3 -based coating as a high-performance supercapacitor electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jie Wang,Haibao Liu,Yan Wang,Defang Ma,Guangping Yao,Qinyan Yue,Baoyu Gao,Xing Xu
The newly emerged ultraviolet light-emitting diode (UV-LED) as a new UV source may replace the conventional UV lamps for water treatment in the foreseeable future. In this study, UV-LED with four wavelengths (i.e., 255, 265, 280, and 310 nm) was used to investigate the wavelength-dependency of UV-LED/O 3 process on the radical/non-radical formation and hexazinone degradation. The degradation of hexazinone in UV-LED/O 3 process with different wavelengths (31.1–97.4%) was higher than that of O 3 oxidation process alone (20.0%), and the hexazinone removal rate at 280 nm was the highest (97.4%). The fluence-based rate constant of hexazinone degradation in UV-LED/O 3 process (0.19–2.97 × 10 −5 m 2 ·J −1 ) was higher than that in low-pressure UV/O 3 (LPUV/O 3 ) process (0.15 × 10 −5 m 2 ·J −1 ). Hydroxyl radical (·OH) and superoxide radicals (O 2 − ) were the dominant active species in UV-LED/O 3 process, and the single oxygen ( 1 O 2 ) was also beneficial to the degradation of hexazinone. The possible degradation pathways were proposed based on high resolution mass spectrum (MS). The reaction sites of free radicals were further predicted by density functional theory (DFT) calculations. Besides, the Toxicity Estimation Software Tool (T.E.S.T.) and Vibrio fischeri were used to estimate the potential toxicity of hexazinone and intermediates and it was suggested that alkaline environment and sufficient oxidation time were conductive to reducing the toxicity of wastewater.
研究领域:
环境科学
·
水处理工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）