NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 30
·12013-12019
·
IF 3.069
Xiangju Mao,Lu Liu,Fang Xiao,Wenshan Ni,Xintao Cheng
A novel monolithic column was developed with 4-vinylbiphenyl and an ionic liquid as the functional monomers and ethylene dimethacrylate as the cross-linker by thermal copolymerization for reversed-phase capillary electrochromatography. For this monolithic column, an imidazole ionic liquid, 1-allyl-3-methylimidazolium chloride, was introduced as the generator of electroosmotic flow. The composition of the polymerization mixture for the preparation of the monolithic column was optimized in detail. Characterization using scanning electron microscopy and Fourier transform infrared spectroscopy indicated that the monolithic column is synthesized successfully with excellent porous structure. Successful baseline separation of aromatic compounds, phenols and anilines with high resolution and high column efficiency demonstrates that the obtained monolithic column has powerful reversed-phase chromatography performance. The relative standard deviation of the retention time for run-to-run (n = 5), day-to-day (n = 5) and column-to-column (n = 3) is in the range of 0.39–1.30%, 0.68–3.92% and 1.06–3.66%, respectively, which shows the monolithic column possesses good reproducibility. This novel monolithic column has been successfully applied for the separation of phenols in spiked lake water samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 6
·1-16
·
IF 2.127
Zhang Sufeng,Zhao Dongyan,Hou Chen,Liang Chen,Li Hao
A facile and efficient one-pot method for the synthesis of well-dispersed hollow CuFe 2 O 4 nanoparticles (H-CuFe 2 O 4 NPs) in the presence of cellulose nanocrystals (CNC) as the support was described. Based on the one-pot solvothermal condition control, magnetic H-CuFe 2 O 4 NPs were in-situ grown on the CNC surface uniformly. TEM images indicated good dispersity of H-CuFe 2 O 4 NPs with uniform size of 300 nm. The catalytic activity of H-CuFe 2 O 4 /CNC was tested in the catalytic reduction of 4-nitrophenol (4-NP) in aqueous solution. Compared with most CNC-based ferrite catalysts, H-CuFe 2 O 4 /CNC catalyst exhibited an excellent catalytic activity toward the reduction of 4-NP. The catalytic performance of H-CuFe 2 O 4 /CNC catalyst was remarkably enhanced with the rate constant of 3.24 s −1 g −1 , which was higher than H-CuFe 2 O 4 NPs (0.50 s −1 g −1 ). The high catalytic activity was attributed to the introduction of CNC and the special hollow mesostructure of H-CuFe 2 O 4 NPs. In addition, the H-CuFe 2 O 4 /CNC catalyst promised good conversion efficiency without significant decrease even after 10 cycles, confirming relatively high stability. Because of its environmental sustainability and magnetic separability, H-CuFe 2 O 4 /CNC catalyst was shown to indicate that the ferrite nanoparticles supported on CNC were acted as a promising catalyst and exhibited potential applications in numerous ferrite based catalytic reactions.
ᅟ
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Shaoyan Zhou,Naizhong Song,Xueju Lv,Qiong Jia
In this work, we designed a novel hybrid material based on the polymerization of an ionic liquid on a magnetic core and further functionalized with carboxylatocalix[4]arene. Scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy, thermal gravimetric-derivative thermogravimetric analysis, energy dispersive X-ray spectroscopy, X-ray diffractometer, and vibrating sample magnetometer were utilized to examine the physicochemical properties of the hybrid material obtained. The material was used as the adsorbent for magnetic solid-phase extraction of phthalate esters. To obtain the maximum pre-concentration efficiency, a series of parameters influencing the extraction efficiency, including sample pH, adsorbent amount, adsorption time, eluent type as well as salt addition, was examined systematically. Under the optimum conditions, a fast and feasible pre-concentration protocol for phthalate esters was established with satisfactory enrichment factors between 158.7 and 191.3. The limits of detection from high-performance liquid chromatographic analysis for the target analytes were in the range of 0.02–0.31 ng mL ―1 . The wide linear ranges varying from 0.1 to 100 ng mL ―1 were achieved with correlation coefficients greater than 0.9977. To evaluate the feasibility of this method, it was successfully applied to analyse phthalate esters in multiple kinds of real samples including tap water, lake water, drinks, tonic lotions, and human serum samples. The results obtained demonstrated that the synthesized magnetic material had potential as a candidate in the pre-concentration field for phthalate esters due to the special properties stemming from its structure and components.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Osin Oluwatomiwa A.,Yu Tianyu,Cai Xiaoming,Jiang Yue,Peng Guotao,Cheng Xiaomei,Li Ruibin,Qin Yao,Lin Sijie
The photocatalytic activity of TiO2 based photocatalysts can be improved by structural modification and elemental doping. In this study, through rational design, one type of carbon and nitrogen co-doped TiO2 (C, N-TiO2) photocatalyst with mesoporous structure was synthesized with improved photocatalytic activity in degrading 4-nitrophenol under simulated sunlight irradiation. The photocatalytic degradation efficiency of the C, N-TiO2 was much higher than the anatase TiO2 (A-TiO2) based on absorbance and HPLC analyses. Moreover, using zebrafish embryos, we showed that the intermediate degradation compounds generated by photocatalytic degradation of 4-nitrophenol had higher toxicity than the parent compound. A repeated degradation process was necessary to render complete degradation and non-toxicity to the zebrafish embryos. Our results demonstrated the importance of evaluating the photocatalytic degradation efficiency in conjunction with the toxicity assessment of the degradation compounds.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 27
·14967-14974
·
IF 2.936
Lei Zhang,Shi-Tao Zhang,Yan-Chun Yin,Shu Xing,Wan-Nan Li,Xue-Qi Fu
Glucagon-like peptide (GLP)-1 is a potent glucose-dependent insulinotropic gut hormone released from intestinal L cells. The aim of this study was to investigate isoquercitrin as an inhibitor of dipeptidyl peptidase IV (DPP-IV) and determine whether it affects GLP-1 release in normal mice and NCI-H716 cells. In vitro, we used chromogenic substrate method detection methods to measure DPP-IV. We found that isoquercitrin was a competitive inhibitor, with IC50 and Ki values of 96.8 and 236 μM, respectively. Isoquercitrin and sitagliptin also stimulated GLP-1 release in NCI-H716 cells. In vivo, a type 2 diabetic mouse model was established, and oral treatment with different concentration of isoquercitrin and sitagliptin for 8 weeks significantly decreased the fasting blood glucose level. The weight and the levels of serum GLP-1 and insulin of the mice in the isoquercitrin group were higher than those in the model group (P < 0.001). An oral glucose tolerance test showed that the isoquercitrin significantly inhibited postprandial blood glucose changes in a dose-dependent manner. These findings demonstrated the hypoglycemic effects of isoquercitrin and indicated that isoquercitrin improved insulin sensitivity by targeting DPP-IV.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Mei Cui,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
2,5-Diformylfuran (2,5-DFF) is an important furan-based chemical with broad application potential. To address the difficulties in isolating/purifying the product and recycling the 2,2,6,6- tetramethylpiperidine-1-oxy (TEMPO)-based catalysts, we employed a solvent with a low boiling point in which TEMPO has a low solubility to investigate the effects of TEMPO and its analogs on catalyzing the oxidation of 5-hydroxymethylfurfural (5-HMF). The results indicated that in ethyl acetate with the substitution of one H of TEMPO at the C4 position with either an acetamido ( NH-Ac), methoxy ( OCH 3 ), hydroxy ( OH) or isothiocyanato ( N C S) group, the resulting compound had a product selectivity similar to that of TEMPO (>86%), except for the 4-isothiocyanato-TEMPO-catalyzed reaction. However, after two Hs were substituted with an oxo group ( O), the catalytic efficiency significantly decreased (product yield 16%, selectivity 52%). Based on both the catalytic efficiency and catalyst solubility, a highly efficient method for preparing 2,5-DFF was established using ethyl acetate as the solvent, 4-acetamido-TEMPO as the catalyst and Fe(NO 3 ) 3 and NaCl as cocatalysts. At 40 °C with a substrate concentration of 0.125 mol/L, 5-HMF was completely converted in 2 h, and the yield of 2,5-DFF was 89%. Moreover, when the substrate concentration increased to 0.25 mol/L, the yield of 2,5-DFF was 87%. When 4-acetamido-TEMPO was recovered by centrifugation, the product yield remained as high as 86% after three cycles, demonstrating good recyclability.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Mingming Guo,Yunfei Zhang,Feipeng Du,Yanguang Wu,Qiao Zhang,Can Jiang
In this work, silver nanoparticles/polydopamine coated polyvinyl alcohol (AgNPs/D-PVA) sponge were prepared via anchoring silver nanoparticles (AgNPs) on the inner wall of polyvinyl alcohol (PVA) sponge with dopamine as intermediate. The AgNPs/D-PVA were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, X-ray diffraction pattern (XRD), thermogravimetric analysis (TG) and ultraviolet–visible (UV–vis) spectroscopy. The catalytic activity of the AgNPs/D-PVA was evaluated for the reduction of 4-nitrophenol using NaBH 4 at room temperature. The coupling effect of dopamine enables AgNPs to be firmly anchored on the inner-wall of PVA sponges. AgNPs/D-PVA exhibits excellent catalytic performance for 4-NP and a good stability up to 4 cycles without a significant loss of its catalytic activity. This work develop a low-cost, high-performance and reusable of AgNPs/D-PVA sponge for the efficient and eco-friendly conversion of toxic 4-nitrophenol into harmless 4-aminophenol, which has potential application in sewage treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jianwei Wang,Xiaoqiang Pei,Ge Liu,Jianfeng Bai,Yajie Ding,Jianqiang Wang,Fu Liu
Silver loaded nanofibrous membrane with high catalytic performance for 4-nitrophenol under continuous gravity-driven filtration was developed in this study. A polydopamine (PDA) microsphere and nanofiber coordinated composite structure was fabricated through an in situ PDA synthesis to achieve a high catalyst loading and controllable residence time of 4-nitrophenol. The incorporated PDA microspheres played an important role for the enhancement of catalytic performance due to the increased surface area (23% increase compared with PAN and PAN-PDAs-Ag) and reduced membrane porosity. Silver loading amount and the residence time of 4-nitrophenol was increased by more than 108% (from 1.2 wt% to 2.5 wt%) and 45% (from 0.79 s to 1.15 s) when comparing with PAN-PDAc-Ag and PAN-PDAs-Ag nanofibrous membrane. The conversion rate of 4-nitrophenol in a gravity-driven filtration process was as high as 97% when PAN-PDAs-Ag nanofibrous membrane was used, which was much higher than the PAN-PDAc-Ag membrane (80%). In addition, the PAN-PDAs-Ag nanofibrous membrane exhibited excellent recycle performance, the conversion rate was maintained as high as 93% after five times of reuse. The microsphere and nanofiber coordinated structure with enhanced surface area and controllable residence time of contaminants proposed in this study might advance the real applications of electrospun nanofibrous membrane for catalytic removal of contaminants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Weiping Kong,Yong Liu,Fujian Liu
Efficient micro-meso-macroporous solid acids spheres with controllable acid strength were successfully synthesized by simultaneous grafting of −SO3H and −SO2CF3 onto the network of commercial XAD-4 resin. The synthesized solid acids are designated as XAD-4-SO3H and XAD-4-SO3H-SO2CF3. Various characterizations show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 possess high BET surface areas, hierarchical porous structures with combined micro-meso-macropores, high concentrations of acid sites, and strong acid strength. Catalytic tests show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 exhibit superior activities and good reusability in various acid-catalyzed reactions including esterification of acetic acid with cyclohexanol, acylation of anisole with acetyl chloride, and catalytic synthesis of bisphenol A. Their activities were better than the solid acids of Amberlyst-15, SBA-15-SO3H-0.1, H3PW12O40, and acidic zeolites. This work develops a new method for scalable transformation of commercially macroporous resin into efficient porous solid acids, which promotes their wide use in industrial catalysis.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Lu Fan,Yurong Yan,Bin Guo,Min Zhao,Jia Li,Xintong Bian,Haiping Wu,Wei Cheng,Shijia Ding
Alloy nanomaterials with various morphologies have showed their potential application in electrochemical signal amplification. However, it is still challenging to fabricate stable multimetallic nanomaterials with large surface area and strong electrochemical activity for the further enhancement of electrochemical sensors’ performance. Here, the trimetallic AgPtCo nanodendrites (NDs) were synthesized as powerful redox probe and highly efficient signal amplifier for electrochemical signal readout. A robust and ultrasensitive electrochemical immunosensor, based on AgPtCo NDs and magnetic nanocomposites (Fe 3 O 4 @SiO 2 @Au MNCs), was successfully developed to detect serum human epididymis protein 4 (HE4). The established method, drawing upon the strong electrochemical activity of AgPtCo NDs and the enrichment and separation effect of MNCs, exhibited a wide linear range (0.001–50 ng mL −1 ) and a low detection limit (0.487 pg mL −1 ). Besides, the developed sensor was applied to analyze the concentration of HE4 in real samples and the results achieved were consistent with those of clinical methods. Thus, this AgPtCo NDs and MNCs based electrochemical immunosensor might become a powerful alternative approach for ultrasensitive detection of various serum biomarkers associated with early diagnosis and treatment of diseases.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Depeng Zhang,Junjuan Qian,Yinhui Yi,Odoom Jibrael Kingsford,Gangbing Zhu
Since acetaminophen (ACAP) and 4-aminophenol (4-AP, the degradation product from ACAP) have different properties and toxicities, the simultaneous electrochemical determination of ACAP and 4-AP is very important. In this work, nitrogen-doped hollow carbon spheres wrapped with MoS 2 nanosheets (MoS 2 @NHCSs) novel hybrids were synthesized via a simple step-by-step method and consecutively the obtained MoS 2 @NHCSs was successfully used to construct a reliable electrochemical sensor for simultaneously detecting acetaminophen (ACAP) and 4-aminophenol (4-AP). Owing to the synergetic properties of each component in MoS 2 @NHCSs nanohybrids (MoS 2 has highly catalytic activity and can offer many active sites; NHCSs can impede the aggregation tendency and enhance the effective surface area of MoS 2 as well as increasing the conductivity of the nanohybrids), the experimental results demonstrated that the electrochemical responses of both 4-AP and ACAP at MoS 2 @NHCSs modified electrode are much better than those at NHCSs or MoS 2 modified electrodes. Importantly, the MoS 2 @NHCSs nanohybrids can show excellent electrochemical sensing performance for the sensitive and selective as well as simultaneous determination of ACAP and 4-AP. After optimizing various conditions, the proposed MoS 2 @NHCSs-based sensor has wide linear range and low detection limit for ACAP and 4-AP analysis.
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 5
·501-504
·
IF 0.975
Ya Liu,Yuqing Miao
The quadrangular (QA) bismuth oxychloride nanoflakes (NFs) were synthesised by a simple solvothermal reaction. They were characterised by scanning electron microscope, transmission electron microscope and X-ray diffractometer. As catalysts, the square NFs exhibited excellent catalytic performance in the reduction of 4-nitrophenol (4-NP) and the degradation of rhodamine B (RhB). The complete reduction of 4-NP to 4-aminophenol was obtained in 30 s and the nearly complete degradation of RhB in 20 min.
✓ 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）