CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Juan Yang,Jingyi Hao,Siyu Xu,Jun Dai,Yan Wang,Xinchang Pang
In this study, Nb 2 O 5 nanorods/graphene composites (NbO NRs/GR) are prepared by one-pot alkaline hydrothermal process, utilizing the new roles of graphene oxide (GO) as the structure-directing and morphology-controlling agent for the growth of NbO NRs. Compared to blank NbO, NbO/GR composites exhibit significantly improved photocatalytic activity for 4-CP degradation under visible-light irradiation, although 4-CP and NbO do not absorb visible light themselves. The in-situ formation of surface complexes between 4-CP and NbO and the subsequent charge transfer based on LMCT mechanism can be responsible for the visible photocatalytic activity. And meanwhile, the photoelectrons transferred to GR surface from in-situ formed complex (NbO/4-CP) via NbO NRs can initiate the synergistic Cr(VI) reduction. The GR contents and NbO crystalline phase have great effects on the photocatalytic activity of NbO/GR composites toward simultaneous 4-CP degradation and Cr(VI) reduction. The amorphous NbO/GR composite with 4.0 wt% GR (NbO-400/GR-4.0%) shows the highest photocatalytic activity. The influences of various experimental conditions (including the surface fluorination of NbO/GR, the initial concentrations of 4-CP and Cr(VI), pH, reaction atmosphere, and adding radical scavengers) on the visible photocatalytic activities are investigated in detail. According to the catalytic activity, UV-vis DRS and FT-IR spectra of NbO/4-CP or NbO/GR/4-CP, and photocurrent response in aqueous 4-CP solution, the formation of the surface complex is evidenced and the visible-light catalytic mechanism based on LMCT process is proposed.
✓ 已验证
DOI
高影响因子
Chinese Journal of Chromatography
·
2026
·Vol. 44
·期 10
·1212
·
IF 1.4
CHEN Chun,GONG Yanan,WANG Bangjin,XIE Shengming,ZHANG Junhui,YUAN Liming
多孔有机笼（POCs）是一类由分立的三维笼状分子通过分子间作用组装形成的新型多孔材料，具有良好的溶解性和独特的多孔结构，在气体吸附、分子识别、分离、催化、传感等领域展现出良好的应用前景。本文以酚酞为底物，三氟乙酸和六次甲基四胺为甲酰化试剂，由Duff反应合成了基于酚酞的四醛基化合物，再与（1 R ，2 R ）-（-）-1，2-环己二胺通过亚胺缩合反应合成了一种基于酚酞的［2+4］型手性亚胺多孔有机笼（Pim， C 72 H 68 N 8 O 8 ）。将合成的Pim用5-溴-1-戊烯修饰烯基功能化后与巯基硅胶通过巯基-烯点击反应制得了一种新型高效液相色谱（HPLC）手性固定相（CSP），并评价了其在正相高效液相色谱（NP-HPLC）和反相高效液相色谱（RP-HPLC）分离模式下的手性拆分性能。结果表明，该CSP填充的Pim柱在NP-HPLC和RP-HPLC分离模式下均表现出良好的手性分离性能。其中，在NP-HPLC分离模式下成功拆分了10种外消旋体，在RP-HPLC分离模式下成功拆分了9种外消旋体。所制备的Pim柱与两种广泛使用的Chiralpak AD-H和Chiralcel OD-H商品柱具有良好的手性拆分互补性，能拆分这两种商品柱不能拆分或拆分效果不理想的一些手性化合物。此外，所制备的Pim柱还具有良好的分离重复性和稳定性。历经数百次进样使用后，其对外消旋体拆分的保留时间和分离度与柱使用之初相比无明显变化，相对标准偏差（RSD， n =5）分别≤1.50%和≤1.92%；在柱放置保存1个月后，其分离效果与柱使用之初的分离效果也无显著改变，保留时间和分离度的RSD（ n =3）分别≤1.88%和≤2.26%。本研究证明手性POC Pim是一种良好的HPLC手性分离材料，为基于POCs的新型HPLC手性固定相的开发提供了重要的理论与实验依据，也对拓展POCs类CSPs具有重要意义。 Porous organic cages （POCs） represent a class of emerging porous materials assembled from discrete three-dimensional cage-like molecules via intermolecular interactions. Owing to their good solubility and unique pore structures， they show great potential in gas adsorption， molecular recognition， separation， catalysis， and sensing. In this study， a phenolphthalein-based tetraaldehyde compound was synthesized via the Duff reaction using phenolphthalein as the substrate and trifluoroacetic acid （TFA） combined with hexamethylenetetramine （HMTA） as the formylation reagent. Subsequently， a ［2+4］-type chiral imine POC， Pim （C 72 H 68 N 8 O 8 ）， was constructed by reacting the tetraaldehyde precursor with （1 R ，2 R ）-（-）-1，2-diaminocyclohexane via imine condensation. The synthesized Pim was functionalized with alkenyl groups using 5-bromo-1-pentene and then immobilized onto thiol-modified silica via thiol-ene click chemistry to afford a novel chiral stationary phase （CSP） for high performance liquid chromatography （HPLC）. The successful syntheses of tetraaldehyde compound， Pim， and CSP were characterized by nuclear magnetic resonance （NMR）， fourier transform infrared spectroscopy （FT-IR）， electrospray ionization mass spectrometry （ESI-MS）， thermogravimetric analysis （TGA）， and elemental analysis （EA）. The chiral separation performance of this CSP was evaluated under both normal-phase （NP） and reversed-phase （RP） HPLC separation modes. The results demonstrated that the CSP exhibits excellent chiral separation capabilities in both two separation modes. Under NP-HPLC conditions， ten racemates were resolved， including five with baseline separation. Under RP-HPLC conditions， nine racemates were resolved， of which eight achieved baseline separation. Furthermore， this CSP exhibits good chiral separation complementarity with two widely used commercial columns， Chiralpak AD-H and Chiralcel OD-H， showing the ability to resolve some chiral compounds that cannot be resolved or are poorly resolved by the two commercial columns. The effects of analyte injection mass and column temperature on chiral separation performance of the column were also investigated. Additionally， the prepared HPLC column exhibits good repeatability and stability. After hundreds of injections， no significant changes were observed in the retention times and resolutions compared to its initial performance， with relative standard deviations （RSDs， n =5） of ≤1.50% and ≤1.92%， respectively. Meanwhile， after the column was placed and stored for one month， its separation performance showed no significant change compared with that at the initial stage of column use， and the RSDs （ n =3） of retention time and resolution were ≤1.88% and ≤2.26%， respectively. This study confirms that the chiral POC Pim is a promising material for HPLC chiral separation， providing significant theoretical and experimental support for the development of novel POC-based CSPs and holding great significance for expanding the POC-based CSPs.
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 221
·期 14
·2000144
·
IF 2.335
Guangfa Shi,Xiaomin Cai,Wenqiang Wang,Gengchao Wang
Polymeric positive temperature coefficient (PTC) materials can be used to install “brake” technology for the thermal runaway of lithium-ion batteries. However, it still has poor cycle stability and obvious negative temperature coefficient (NTC) effect, which reduces the reliability of the material. In order to solve these problems, conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) modified multilayer graphene (MLG) conductive additive (PEDOT-MLG) is introduced into middle density polyethylene/carbon black (MDPE/CB) system. Compared with the conventional modification, the PEDOT modified MLG shows high conductivity and excellent thermal stability. In addition, the introduction of PEDOT-MLG into MDPE/CB can further reduce the room temperature resistivity due to the good compatibility between the modified graphene and the matrix, thus improving the PTC intensity to 7.1. What is more, MLG limits the re-aggregation of CB particles when the temperature further rises, which effectively weakens the NTC effect.
研究领域:
高分子材料科学
·
功能材料
·
能源材料
·
纳米复合材料
·
电学性能
·
锂离子电池安全
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 34
·15881-15891
·
IF 6.97
Yong Xu,Jun Chen,Ze'en Xiao,Caixia Ou,Weixia Lv,Lihong Tao,Shengwen Zhong
A porous composite electrode composed of diatomite-mixed 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) is prepared by electrostatic spinning technology. Compared with traditional coated electrodes without diatomite mixing, the obtained composite electrode materials have higher porosity, larger specific surface area and faster lithium ion transport channels, which makes them exhibit better electrochemical performance, such as smaller impedance, higher capacity, and better cycling stability and rate performance. The electrospun diatomite-mixed 1,4,5,8-NTCDA composite (ED-1,4,5,8-NTCDA) electrode shows an initial coulombic efficiency of 77.2%, which is much higher than that of the electrospun 1,4,5,8-NTCA (E-1,4,5,8-NTCDA) electrode without diatomite mixing (63.8%) and the coated 1,4,5,8-NTCA (C-1,4,5,8-NTCDA) electrode (48.3%). Moreover, the ED-1,4,5,8-NTCDA electrode displays an initial discharge capacity of 1106.5 mA h g−1, which is much higher than that of the E-1,4,5,8-NTCDA electrode (546.0 mA h g−1) and the C-1,4,5,8-NTCDA electrode (185.4 mA h g−1). After 200 cycles, the capacity of the ED-1,4,5,8-NTCDA electrode remains at 1008.5 mA h g−1 with a retention ratio of 91.2%, which is also much higher than that of 753.2 mA h g−1 for the E-1,4,5,8-NTCDA electrode and 288.1 mA h g−1 for the C-1,4,5,8-NTCDA electrode. Even at a higher current density of 1500 mA g−1, its capacity remains above 508.9 mA h g−1. The ED-1,4,5,8-NTCDA electrode presents superior performance, which opens up a promising new approach for further utilization of organic materials as electrode materials in rechargeable lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2026
·
IF 4.2
Jiaxin Zhang,Libing Cai,Lin Wang,Lianhui Zhang,Nan Meng,Andong Chen,Qiao Ma
The organic booster biocide DCOIT (4,5-dichloro-2-n-octyl-4-isothiazolin-3-one) is widely used in marine antifouling systems, yet its ecological impacts on sediment microbiomes remain poorly understood. Here, we integrated absolute quantitative 16S rRNA gene sequencing, metagenomics, and enzyme activity assays to examine microbial responses to DCOIT exposure (0–50 μg/g sediment) over 30 days. DCOIT induced oxidative stress and bioenergetic impairment, accompanied by reduced microbial activity and inhibition of key enzyme-mediated processes involved in organic matter turnover and nitrogen transformation. Absolute quantification revealed a compensatory increase in total microbial abundance by Day 30, despite persistent diversity loss and community restructuring. Metagenomic analysis showed that DCOIT disturbed functional potentials related to carbon and nitrogen cycling. Kordiimonas, Aliikangiella, and Neptuniibacter emerged as potential contributors to nitrogen transformation, whereas Marinobacter was more closely associated with potential DCOIT transformation. DCOIT exposure also enriched adaptive traits, including chemotaxis, motility, quorum sensing, and biofilm regulation, and was accompanied by increased multidrug efflux systems and heavy metal resistance determinants. Our findings provide novel insights into the ecotoxicological risks of isothiazolinone biocides and highlight the potential for DCOIT to undermine sediment ecosystem functions and microbial habitat health. Given its extensive application, this study emphasizes the need to consider the microbial ecological consequences of DCOIT accumulation in seafloor environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Current Research in Food Science
·
2025
·
IF 7
Jie Liu,Zihang Wang,Chenchen Hu,Jingxuan Xu,Ranran Chang
To enhance the digestion resistibility and short-chain fatty acid contents of corn starch, type 4 resistant starch was obtained by chemical cross-linking with sodium phytate and acylation with acetic, propionic, and butyric anhydride, respectively. The influence of single and double chemical modification on the physicochemical properties, digestibility, and short-chain fatty acid yields of corn starch was investigated. The phosphorus content of starch samples was 0.0180 %–0.1232 %, which was less than 0.4 % within the required safety range. Corn starch by cross-linking or/and acylation still maintained A-type crystalline structure. The resistant starch content of corn starch modified by cross-linking and then butyrylation was the highest about 52.8 %. Notably, acetylated-cross-linked starch improve the yields of acetic, propionic, and butyric acids in vitro fecal fermentation. This study will facilitate the design and production of functional foods containing type 4 resistant starch for the prevention and adjuvant treatment of chronic diseases such as type Ⅱ diabetes and obesity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 46
·19696-19706
·
IF 0
Xuanduong Le,Zhengping Dong,Yansheng Liu,Zhicheng Jin,Thanh-Do Huy,Minhdong Le,Jiantai Ma
In this study, a novel core–shell magnetic fibrous nanocatalyst, Pd/Fe3O4@SiO2@KCC-1 with easily accessible active sites and a convenient recovery by applying an external magnetic field, was successfully developed. Fe3O4@SiO2@KCC-1 was functionalized with amino groups which act as robust anchors so that the palladium nanoparticles (Pd NPs) with an average diameter of about 4 nm were well-dispersed on the fibers of Fe3O4@SiO2@KCC-1 without obvious aggregation. The synthesized Pd/Fe3O4@SiO2@KCC-1 nanocatalyst exhibited excellent catalytic activity in the reduction of 4-nitrophenol by sodium borohydride, and the Suzuki cross coupling reactions of aryl chlorides with aryl boronic acids due to the easy accessibility of the active sites. Furthermore, the Pd/Fe3O4@SiO2@KCC-1 nanocatalyst was conveniently recovered by a magnet and could be reused for at least five cycles without significant loss in activity, thus confirming its good stability. Therefore, the abovementioned approach based on core–shell magnetic fibrous Fe3O4@SiO2@KCC-1 provided a useful platform for the fabrication of Pd NPs based catalysts with easy accessibility, superior activity and convenient recovery.
研究领域:
催化化学
·
纳米材料
·
应用化学
·
环境化学
·
有机合成
✓ 已验证
DOI
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.1
Jiazuo Wei,Bowen Tan,Bolun Yang,Jingjun Liu
To identify suitable extractants for extractive enhanced glycerol-CO2 carbonylation, liquid–liquid equilibrium data were determined for glycerol–glycerol carbonate systems with 2-pentanone, cyclohexanone, and 4-methyl-2-pentanone at 423.2, 433.2, and 443.2 K under a pressure of 1.5 MPa. The efficacy of the three extractants in the extraction of glycerol carbonate from glycerol was evaluated using distribution coefficients and extractive selectivity. Among the extractants, cyclohexanone possessed the highest distribution coefficient (>1) and superior extraction capability, while 4-methyl-2-pentanone exhibited the best selectivity for glycerol carbonate over glycerol. The liquid–liquid equilibrium data were then correlated using the Non-Random Two-Liquid (NRTL) model, and the corresponding binary interaction parameters were determined. The regressed parameters effectively reproduced the phase equilibrium trends observed for all studied systems. This work provides fundamental data and parameters for the selection of extractant to enhance the glycerol-CO2 carbonylation through extractive reactions as well as for subsequent process development and optimization for the carbonylation.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 7
·6172
·
IF 5.6
Tianxiao Sun,Haihua Li,Yan Zhang,Guixin Xiong,Yuerun Liang,Fang Lu,Rong Zheng,Qi Zou,Jiejie Hao
Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease characterized by lung inflammation and excessive deposition of extracellular matrix components. Transforming growth factor-β1 (TGF-β1) induced epithelial–mesenchymal transformation of type 2 lung epithelial cells leads to excessive extracellular matrix deposition, which plays an important role in fibrosis. Our objective was to evaluate the effects of 3-cyclopropylmethoxy-4-(difluoromethoxy) benzoic acid (DGM) on pulmonary fibrosis and aimed to determine whether EMT plays a key role in the pathogenesis of pulmonary fibrosis and whether EMT can be used as a therapeutic target for DGM therapy to reduce IPF. Firstly, stimulation of in vitro cultured A549 cells to construct EMTs with TGF-β1. DGM treatment inhibited the expression of proteins such as α-SMA, vimentin, and collagen Ⅰ and increased the expression of E-cadherin. Accordingly, Smad2/3 phosphorylation levels were significantly reduced by DGM treatment. Secondly, models of tracheal instillation of bleomycin and DGM were used to treat rats to demonstrate their therapeutic effects, such as improving lung function, reducing lung inflammation and fibrosis, reducing collagen deposition, and reducing the expression of E-cadherin. In conclusion, DGM attenuates TGF-β1-induced EMT in A549 cells and bleomycin-induced pulmonary fibrosis in rats.Keywords:IPF;A549;EMT;TGF-β1/Smad;ECM
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 39
·3881-3889
·
IF 3.532
Jiao Luo,Hongyan Tan,Bin Yang,Donghua Chen,Junjie Fei
In this study, a mesoporous silica fluorescence probe co-doped with manganese-doped zinc sulfide quantum dots (Mn:ZnS QDs) and rhodamine B (RB) and coated with molecularly imprinted polymer (MIP) has been prepared by sol–gel methods. The morphology and structure were characterized in detail by transmission electron microscopy (TEM), Fourier transform-infrared absorption spectroscopy (FT-IR) and ultraviolet-visible absorption spectroscopy (UV-vis). The probe exhibited two characteristic emission peaks at 411 nm and 582 nm, and the synchronous ratiometric fluorescence responses F411/F582 to different concentrations of 4-nitrophenol (4-NP) showed a good linear correlation in the range of 0.01–10 μmol L−1 besides achieving the sensitive detection of 4-NP with a detection limit as low as 3.0 nmol L−1 (3σ). The probe possesses the advantages of selectivity toward the target molecular structure, self-stability in the detection time domain and anti-interference ability, exhibiting excellent potential for application in 4-NP detection in different water environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qinglin Wang,Zhuojun Wei,Jin Li,Danyang Feng,An Feng,Hui Zhang
Water-soluble captopril-capped atomically precise Pd nanoclusters (Pd17Capt8 NCs: 1.3 ± 0.5 nm) produced by a simple chemical reduction were supported on preprepared hybrid Co3Al-layered double hydroxide/reduced graphene oxide (Co3Al-LDH/rGO) by a pH-adjusted electrostatic adsorption strategy followed by proper calcinations, giving a series of novel catalysts x-PdNCs/CoAl(O)/rGO-T (x (Pd loading) = 0.09, 0.17, 0.43 wt % (ICP), T = 230, 250, 280, 300, 320 °C). The characterization results show that the as-obtained catalysts possess the hierarchical nanosheet array morphology. Pd NCs with a size of ∼1.3 to 1.8 nm are highly distributed at the edge sites of the CoAl(O) nanosheets. All of the x-PdNCs/CoAl(O)/rGO-T catalysts show superior catalytic efficiency for the conversion of 4-nitrophenol to 4-aminophenol, particularly 0.17-PdNCs/CoAl(O)/rGO-300 possesses the highest performance with a turnover frequency (TOF) of 30 042 h–1, which is the highest among the reported Pd-based catalysts so far. The superior activity of 0.17-PdNCs/CoAl(O)/rGO-300 can be owing to ultrafine Pd NCs with a clean surface, the strongest PdNCs–Co2+-OH(LDH)–rGO three-phase synergy, and the much improved adsorption of the substrate via π–π stacking upon nanosheet array morphology. Meanwhile, 0.17-PdNCs/CoAl(O)/rGO-300 exhibits excellent catalytic activities for various nitroarenes and anionic azo dyes as well as good reusability with the complete reduction of 4-nitrophenol (4-NP) within 90 s after 10 successive runs. The present work provides not only a simple and convenient strategy for the synthesis of clean, efficient, and environmentally friendly supported metal nanocluster catalysts but also a new idea for the efficient catalytic degradation of environmental pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Haiwen Li,Junhu Xin,Yuhang Xue,Cunde Wang
A pseudo-three-component annulation reaction of substituted 2-amino-4H-chromen-4-ones with aromatic aldehydes promoted by DBU was investigated to access polysubstituted 5H-chromeno[2,3-b]pyridines. This reaction included a sequential intermolecular nucleophilic addition/Michael cyclization/intramolecular epoxidation/ring opening/aromatization sequence, which possessed excellent step and atom economy in a single operation for generating 3-hydroxy-5H-chromeno[2,3-b]pyridines from readily available substrates.
✓ 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）