JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jun Gao,Ping He,Tiantian Yang,Xuejiao Wang,Lianhong Zhou,Qihang He,Lingpu Jia,Hongquan Deng,Hui Zhang,Bin Jia,Xiaochun He
Constructing a sensitive voltammetric platform to analyze highly toxic organic pollutant p-chloronitrobenzene (p-CNB) is highly desirable in environmental monitoring. Herein, a composite consisting of nickel-based metal-organic framework (Ni-MOF) and graphene oxide (GO) was successfully prepared by facile and cost-efficient chemical precipitation , and it was further used as a modified material to develop an electrochemical sensor for p-CNB. Electrochemical properties of as-prepared sensor were investigated by electrochemical impedance spectroscopy , cyclic voltammetry and differential pulse voltammetry . As a result, the composite sensor showed superior electrocatalytic performance towards the oxidation of p-CNB in a concentration range of 0.10–300.0 μM, and the detection limit was 8.0 nM (S/N = 3). Furthermore, as-prepared Ni-MOF/GO composite based sensor exhibited favorable reproducibility, durable stability and prominent selectivity. The practicability of the sensor was evaluated by detecting p-CNB in real tap water samples and satisfactory recovery rates were obtained, revealing its potential application for detection of p-CNB in water environment.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yao Zhang,Jingshu Yuan,Liang Zhao,Boyu Wu,Bolin Zhang,Pianpian Zhang,Shengen Zhang,Chaofang Dong
Graphite carbon nitride (g-C 3 N 4 ) is regarded as a potential candidate to settle environmental and energy issues, but its activity remains unsatisfactory due to the huge exciton effect and delayed charge transfer. Herein, the effects of phosphorus-doping and two-dimensional (2D) porous structures on the transition among singlet excitons, triplet excitons, and carriers and consequently the regulation mechanism of reactive oxygen species have been intensively studied. The calculations of the density functional theory and experimental results confirmed that P-doping could induce a dual built-in electric field to provide a driving force (up to 0.3 eV) for exciton dissociation. The light response capability, exciton dissociation, and carrier migration efficiency were significantly enhanced by the synergistic effect of the dual electric field and 2D porous structure. The optimal sample exhibited excellent H 2 evolution rate and tetracycline degradation rate under visible-light irradiation which were approximately 25 and 7.1 times higher than those of bulk g-C 3 N 4 , respectively. The improved photocatalytic activity can also be demonstrated by a 2.9-fold and 3.2-fold increase in ·O 2 – and H 2 O 2 production, respectively. This work provides a new perspective and approach to improve the performance of polymer photocatalysts and the targeted regulation of active species using exciton engineering.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiuling Chen,Lei Wu,Cong Xie,Shan Xu,Yanfang Fan,Nanwen Li
Carbon molecular sieve (CMS), as the gas separation membrane materials, still faces challenges for regulation pore diameter precisely. In this work, we propose to reconstruct the 6FDA-DAM-Br-85% polyimide CMS membranes by introducing 6,6'-(1,4-phenylenebis(((4-hydroxyphenyl)amino)methylene))bis(dibenzo[c,e][1,2] oxaphosphinine6-oxide) small molecule compound (DOPO- p -DP) as crosslinking agent to regulate the pore distribution. The crosslinked precursors were obtained via the reaction between C–Br bond in 6FDA-DAM-Br-85% polyimide and N–H bond in DOPO- p -DP compound, the precursors and CMS membranes (550 °C- 2 h) were characterized with ATR-TFIR, XRD and XPS. The pore size distribution of crosslinked CMS membranes was range in 4.5–8.0 Å from the N 2 adsorption data. The crosslinked CMS membranes exhibited excellent gas separation performance, which was strongly dependent on the mass fraction of DOPO- p -DP, an increasing mass fraction of DOPO- p -DP leaded to improve in gas selectivity, while reduced its permeability. The 6FDA-DAM-Br-85%/DOPO- p -DP-20% CMS membrane showed the impressive permeability and superior gas selectivity, the permeabilities of O 2 , CO 2 , and H 2 are 798, 3018, and 13560 Barrer combined with the O 2 /N 2 , CO 2 /CH 4 , and H 2 /CH 4 selectivities of 7.8, 65.6, and 294.8 respectively, the separation performances surpassed the latest trade-off relationship. In addition, the 20% of the DOPO- p -DP crosslinked CMS membrane revealed the superior aging behaviour than that of the 6FDA-DAM-Br-85% CMS membrane over 480 h aging under vacuum conditions.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qingqing Shi,Yaqi Hou,Qiting Zhu,Yongmei Hao
Due to the complex structure of metal–carbon-based catalysts derived from metal-organic frameworks (MOFs), it is difficult to clarify the active sites and catalytic mechanisms. Constructing of structure–activity relationship is conducive for identifying active center, but there is still a gap in the bimetal-carbon-based catalysts/PMS systems. Here, we report a highly efficient and stable CuCo bimetal-nitrogen doped carbon catalyst (CuCo@C-N) for the activation of PMS for efficient degradation of PNP. By manipulating the catalyst structure, establishing the structure–activity relationship and combining with DFT calculation, the non-metallic active centers were determined, including defects, C=O and graphite N. Co was the only metal active center, and the presence of Cu accelerated the redox cycle of the system. The degradation of PNP was dependent on electron transfer and ROS activation. The metal active center was used to generate sulfate radicals (SO 4 •− ), and the non-metal active sites accelerated electron transfer and non-radical pathways to generate 1 O 2 .
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-8
·
IF 5.479
Guo Liying,Hao Lin,Gao Tian,Wang Chun,Wu Qiuhua,Wang Zhi
Graphene oxide was covalently modified with p -phenylenediamine via a diazonium reaction. The resulting material was employed as a sorbent for the solid-phase extraction of six phenylurea herbicides (metoxuron, monuron, chlortoluron, isoproturon, monolinuron, and buturon) from environmental water and lettuce leafs. Some key factors that influence the extraction efficiency were studied, including sample loading rate, sample pH, and desorption conditions. Following desorption with acetonitrile, the analytes were quantified by HPLC with UV detection. Under optimized conditions, response to phenylurea herbicides is linear in the 2.0–100 ng mL −1 concentration range for water samples, and 5.0–100 ng g −1 for leaf lettuces. The limits of detection are 0.10–0.25 ng mL −1 for water samples, and 1.5–2.5 ng g −1 for leaf lettuces. The sorbent was also applied to the preconcentration of organic compounds including nitroimidazoles, chlorophenols, phenylurea insecticides and phthalates. This shows that this sorbent has a large potential for the enrichment of organic pollutants.
A graphene oxide/ p -phenylenediamine (GO@PA) composite was prepared via a simple and environmentally-friendly diazonium reaction between p -phenylenediamine diazonium salt and graphene oxide. It was used as the solid phase extraction (SPE) adsorbent to extract phenylurea herbicides with the extraction efficiency higher than that of commercial C18, multi-walled carbon nanotube and polystyrene polymer. The SPE method was combined with HPLC for simultaneous determination of six phenylurea herbicides in environment water and vegetable samples.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·975-983
·
IF 3.603
Li Hui-Xian,Hou Lei,Wu Pei-Yi
The time-resolved attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy is employed to investigate the transport mechanism of gel electrolytes by monitoring the diffusion behavior of propylene carbonate-lithium bis(trifluoromethylsulfonyl)imide (PC-LiTFSI) solution through poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) films. Fickian behavior has been observed for both TFSI − and PC. Higher temperature leads to faster diffusion of TFSI − and PC, which could be related to the increased free volume in P(VDF-HFP) matrix and rapid molecular movements upon heating. Various molecular interactions among LiTFSI, PC and P(VDF-HFP) have been recognized. During the diffusion process, PC molecules, in the form of small clusters, can firstly diffuse through the P(VDF-HFP) film and interact with P(VDF-HFP) by dipole-dipole interaction, acting as the plasticizer. Then, Li + diffuses into P(VDF-HFP) with the help of ion-dipole interactions between Li + and C-O of PC. Meanwhile, TFSI − diffuses through the polymer matrix in solvation states. In addition, slight ion-dipole interactions between Li + and P(VDF-HFP) have been observed as well. Results in this work contribute to a better understanding of transport process in gel polymer electrolytes for lithium-ion batteries and support the development of improved gel polymer electrolytes by rationally regulating molecular interactions.
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高影响因子
VACUUM
·
2025
·
IF 3.9
Jiajia Ye,Zizhong Chen,Zifan Wang,Li Han,Mingyuan Pang,Zhen Kong,Juan An,Zheng Li,Guang Xia
P-doped CoSe 2 /FeSe 2 heterojunction nanoparticles (2–10 nm) anchored on a three-dimensional porous foam-like carbon network were synthesized via a direct pyrolysis-blowing strategy followed by phosphorization/selenization process. This carbon network serves as a continuous pathway for electron conduction, enhances specific surface area, and alleviates electrode volume expansion during cycling. Specifically, P-doping further improves the electrical conductivity of CoSe 2 /FeSe 2 nanoparticles, significantly accelerating electrochemical kinetics and enabling high specific capacities at elevated current densities. Benefiting from the unique nanostructure and atomic-level P-doping, the P-CoSe 2 /FeSe 2 (2:1)/C anode delivers prominent cycling stability (210.9 mAh g −1 after 2000 cycles at 2000 mA g −1 ) and exceptional rate capability (323.5 mAh g −1 at 5000 mA g −1 ). This work demonstrates that combining heterojunction engineering with heteroatom doping is an effective strategy to enhance the long-term cycling stability of sodium-ion battery anodes.
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产品关联
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高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2025
·
IF 3.5
Yongjun Tang,Zhengning Feng,Chenlu Ma,Nian Jang,Xiaolong Chen,Yingxu He,Francis L. Martin,Hui Liu,Weiyi Pang
Breast cancer has a high global incidence, and benzo[ a ]pyrene (B[ a ]P) is considered a contributing factor that increases carcinogenic risk. This study examined B[ a ]P's oncogenic mechanisms in mammary epithelial cells. Chronic B[ a ]P exposure induced morphological changes and enhanced proliferative/clonogenic capacity in MCF-10A cells. Chronic B[ a ]P exposure altered gene expression in MCF-10A cells, revealing differential levels of circRNAs, lncRNAs, miRNAs, and mRNAs. qRT-PCR validation demonstrated strong alignment with RNA-seq results, ensuring sequencing reliability. Additionally, chronic B[ a ]P exposure upregulated the protein expression of AhR and ARNT, as well as TGF- β , pSmad2/3, and KRT14 , while increasing Vimentin expression and decreasing E-cadherin expression. Notably, treatment with the TGF- β inhibitor SB431542 reversed these protein expression changes in transformed cells. These results show that exposure to Chronic B[ a ]P induces MCF-10A cell transformation. The underlying mechanisms involve significant transcriptional alterations, AhR/ARNT expression regulation, TGF- β signaling pathway activation, KRT14 protein modulation, and EMT. Furthermore, Chronic B[ a ]P exposure may drive transformation through TGF- β modulation. Chronic B[ a ]P exposure promotes breast carcinogenesis, revealing mechanistic insights and potential preventive biomarkers.
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Tinglei Liu,Chen Ding,Kejing Gao,Jingsheng Zhou,Wei-Guang Yang,Shuai Zhou,Yuxuan Lin,Hao-Yu Zhao,Zhong-Zhen Yu,Dongzhi Yang
High filtration loss of the oil-based drilling fluids restricts their application in reservoirs production at high temperature and high pressure. In this work, modified nano-microsphere P(AM-co-AA)/PSt filtration reducers are designed to reduce filtration loss by excellent dispersion in oil medium, excellent water-absorption swelling and auxiliary emulsification and prepared by inverse phase emulsion polymerization using acrylamide, acrylic acid and styrene, followed by modification with stearyl trimethyl ammonium chloride. The modified nano-microspheres absorb water to reach an equilibrium swelling rate of 950%. Additionally, the water contact angle increases to 70.3° and the temperature resistance reaches up to 240 o C. The permeability of the filter cake can be decreased through the utilization of swelling microspheres to plug tiny cracks, as well as by intertwining organo-montmorillonite sheets with polymer chains detaching from weakly crosslinked microspheres. Especially, due to their excellent dispersion in the oil medium, the microspheres gather at the oil-water interface, thereby stabilizing the emulsification state of oil-based drilling fluids. These two points are conducive to reducing filtration loss. After thermal aging for 16 h at 180 o C, oil-based drilling fluid by adding 4% microspheres exhibits a low filtration loss volume of 7.8 mL at 180 o C and 3.5 MPa. These hydrophilic nano-microspheres with a partially alkylated structure have a considerable practical application prospect as filtration loss reducers of oil-based drilling fluids.
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产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Jie Ding,Xiufen Liao,Wanhe Li,Xiangxuan Lin,Huayu Hu,Yanjuan Zhang,Tao Gan,Zuqiang Huang
Using biodegradable films as smart packaging to monitor the freshness of meat in real time is a promising and challenging work. Herein, the phosphorus-doped carbon dots (P-CDs) with pH sensitivity were coated on starch/polyvinyl alcohol film (SP film) by a simple scrape-coating method and applied to monitor the freshness of pork. The P-CDs@SP film exhibits a uniform surface, excellent mechanical properties, higher light blocking. When the total volatile base nitrogen (TVB-N) of pork exceeded 15 mg/100 g, the color of the film changed from brownish-yellow to purple-red, and the total color difference ( ΔE ) of the film obviously increased from 10.24 to 9.37 to 20.75 and 22.93 under the storage conditions of 25 and 4 °C, respectively. This can be attributed to the abundant hydroxyl groups on the surface of P-CDs and SP film to promote their stable binding through hydrogen bonds, which greatly improves the hydrophilicity of the films, providing conditions for the rapid conversion of the TVB-N to ammonia and the formation of an alkaline environment. This work can simply and effectively monitor the freshness of pork through the changes of film color, will provide a new idea for the preparation of biodegradable smart packaging materials.
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高影响因子
ELECTROPHORESIS
·
2020
·Vol. 42
·期 6
·719-724
·
IF 3.081
Evgeniya V. Polyakova,Olga V. Shuvaeva,Olga S. Koshcheeva,Yuliya E. Tyutereva,Ivan P. Pozdnyakov
Arsenic aromatic compounds including p-arsanylic acid (pASA) are still widely used in a number of countries as the feed additives in animal breeding resulting in its entering the environment. Under the influence of oxidizing agents or UV radiation, pASA undergoes transformations leading to generation of inorganic arsenic species that are more mobile and toxic than organic ones. On the one hand, an approach based on the treatment of contaminated waters by UV irradiation seems perspective for their detoxification, but the feasibility of this approach depends on the composition of the products forming as a result of photodegradation. In the present work, a CZE was applied for the study of the pASA degradation process during stationary (308 nm) photolysis in the presence of Fe(III)-oxalate complex. A developed assay allowed controlling the parent compounds and also As-containing products of pASA degradation, presented mainly by arsenate and arsenite ions. It was found that the main inorganic derivatives of the pASA photolytic conversions are presented by arsenate and arsenite ions whose ratio depends on the initial amount of pASA and reaction conditions.
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Dengqi Zhou,Ke Zeng,Liqiang Wang,Feiying Tang
The development of highly efficient non-noble metal catalysts for the hydrogenation of N-heteroarenes under mild condition is of great importance for both theoretical and industrial applications, which can efficiently reduce energy consumption and environmental pollution. In this work, we found that the prepared CoCu nano-alloy catalyst after exposed in the air over 24 h (named Co 1 Cu 1 /C) exhibited a dramatically improved catalytic performance (yield from trace to >99%) for quinoline hydrogenation under mild reaction conditions (60 °C, 3 MPa H 2 ). According to the characterization, the catalyst Co 1 Cu 1 /C exhibited the strong interaction between Co and Cu. Meanwhile, it was endowed with a stable partial oxidation surface. The unsaturated oxygen coordinated surface of Co 1 Cu 1 /C presented a moderate binding for quinoline and 1, 2, 3, 4-tetrahydroquinoline, which could efficiently avoid the deactivation of catalyst and favor the hydrogenation kinetics. The density functional theory (DFT) calculations coupled with X ray-based structural analyses suggested that the unsaturated oxygen coordinated surface could lower the diffusion energy of the active hydrogen species and the reaction barrier for quinoline hydrogenation which resulted from the d - p orbital electron coupling. This work revealed that the catalytic performance of nano-alloy catalysts might not only be ascribed to the interaction between metals, while the unsaturated oxygen coordination of metallic surfaces played an important role.
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