RSC Advances
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2021
·Vol. 11
·期 39
·24065-24071
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IF 3.361
Min Feng,Shaohua Wen,Xiaofang Chen,Die Deng,Xiupei Yang,Run Zhang
Hydroquinone (HQ) is poorly degradable in the ecological environment and is highly toxic to human health even at a low concentration. The colorimetric method has the advantages of low cost and fast analysis, which provides the possibility for simple and rapid detection of HQ. In this work, a new colorimetric method has been developed for HQ detection based on a peroxidase-like catalyst, α-Fe2O3@CoNi. This sweetsop-like α-Fe2O3@CoNi catalyst enables H2O2 to produce hydroxyl (˙OH), leading to the oxidization of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB. In the presence of HQ, the blue oxTMB is reduced to colorless, which allows for colorimetric detection of HQ in water samples. This method has been validated by detecting HQ in water samples with high selectivity, rapid response, broad detection range (0.50 to 30 μM), and low detection limit (0.16 μM).
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 10
·106510
·
IF 4.316
Yijing Xia,Yan Yan,Lingbing Hu,Qizhou Dai,Xiangjuan Ma,Juqing Lou,Yi Xia
This study focused on the enhanced mechanism of electrochemical degradation of antibiotic norfloxacin (NOR) using a self-made Ti/SnO2-Sb2O3/α,β-Co-PbO2 electrode. The electrode characterization, reaction mechanism, degradation performance, and toxicity assessment were studied. In contrast to the conventional Ti/SnO2-Sb2O3/α,β-PbO2 electrode, our prepared Co-doped PbO2 electrode showed the characteristics of more compact surface, smaller crystal size, higher oxygen evolution potential (OEP) and an increased yield of ·OH concentration. The application of Co-doped PbO2 electrode for the electrochemical oxidation of NOR was systematically analyzed. The optimal operating parameters were found to be Na2SO4 concentration of 0.1 mol L−1, initial NOR concentration of 50 mg L−1, initial pH of 5 and current density of 20 mA cm−2. Under these conditions, NOR, chemical oxygen demand (COD) and total organic carbon (TOC) removals reached 85.29%, 43.65% and 41.89% after 60 min of electrolysis, respectively. Through the intermediates detected during the electrochemical treatment process, a reaction pathway involving decarboxylation, defluorination and piperazine ring-opening was proposed. Finally, the toxicity assessment of the treated NOR solution towards Vibrio fischeri rapidly fell to non-toxicity and even reached to negative values after 50 min of electrolysis, indicating that electrochemical oxidation of NOR is an effective approach to reduce its toxicity to environmental ecosystem.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Zhiyuan Wang,Hairu Xiang,Jiawen Zou,Zenghui Mai,Zhenzhen Cao,Mingliang Li,Bingbing Fan,Gang Shao,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
Spherical α-Al 2 O 3 particles with the size of 1–2 μm were obtained by microwave hydrothermal(M-H) method and subsequent microwave calcination. In the synthesis, Al 2 (SO 4 ) 3 ·18H 2 O was used as the aluminum sources, and CH 4 N 2 O was used as the precipitant. The effects of M-H temperature, heating preservation time and pressure in the reactor on the morphology, phase composition, particle size and surface area of the particles were studied. The results show that amorphous precursors with high sphericity and good dispersion can be rapidly (30 min) produced by M-H method at low temperature (100 °C). Increasing the temperature or extending the holding time will destroy the spherical morphology of the precursor, while transforming its phase from amorphous to γ-AlOOH. Pressure in the reactor does not change the phase composition of the precursor, but affects its dispersion and homogeneity. The precursor retains its spherical morphology after microwave calcination at 1100 °C for 90 min. The resulting powders were hot pressed and sintered at 1650 °C for 30 min to obtain a high-performance ceramic plate with a thermal conductivity of 27.1 W/(m·K) and a Vickers hardness of 21.4 GPa.
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JOURNAL OF ORGANIC CHEMISTRY
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2019
·
IF 4.745
Shou-Jie Shen,Xiao-Li Du,Xiao-Li Xu,Ming-Gang Zhao,Jin-Yan Liang
The regioselective N-addition/substitution reaction between α-alkylidene pyrazolinones and propargyl sulfonium salts has been developed to construct functionalized allylthio-containing pyrazolones with moderate to excellent yields. α-Alkylidene pyrazolinones act as N-nucleophilic agents which are distinguished from reported C-nucleophilic reactions. Excellent regioselectivity, readily available starting materials, the broad range of substrates, gram-scale synthesis, and simple operation illustrate the synthetic advantages of this new reaction pathway.
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Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 9
·1754-1761
·
IF 0.581
Yin Hu,Chen Wei,Ba Mingwei,Xie Xin,Song Weiguo
Abstract Ru/TiO 2 nanocomposite was prepared via loading the active ruthenium species on anatase TiO 2 by a simple hydrothermal approach combined with a sol–gel method. The optimal catalyst with 5.0% of Ru species showed excellent catalytic performance in the solvent-free selective hydrogenation of α-pinene with the conversion of α-pinene and selectivity to cis -pinane of 100.0 and 97.1%, respectively. It has been verified that the superior performance depends on the large amounts of acidic sites induced by HF acid and the SMSI effect between the reducible TiO 2 support and Ru species on its surface. The partial loss of its activity after five hydrogenation cycles should be due to the agglomeration of the catalyst particles and the carbon deposition on the surface. The possible hydrogenation mechanism was also discussed. This work provides an effective approach to develop a highly efficient and recyclable catalyst for the solvent-free selective hydrogenation of α-pinene.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Rui Guo
The metastable α-Ag 2 MoO 4 was usually prepared under high pressure conditions, but it was successfully prepared by epitaxial growth on WO 3 nanosheets at room temperature under normal pressure in this work. The interfacial structure of α-Ag 2 MoO 4 /WO 3 (AW) was characterized by XRD , SEM, TEM, and Raman spectra to explain the process of phase transformation from the β phase to the α phase. The photocatalytic activities were evaluated by the degradation of methylene blue and Escherichia coli . The results indicate that AW-60 exhibits the best photocatalytic activity. The enhancement in photocatalytic performance is mainly due to the photogenerated electron flow between the components from WO 3 to Ag 2 MoO 4 in AW-60. The initial inactivation of E. coli is due to the decomposition of macromolecules with a typical mass range m / z of 2–7 kDa. The corresponding photocatalytic mechanism was proposed and confirmed by the measurements, such as BET, fluorescence spectrum, free radical trapping and the ζ potential of WO 3 and AW-60.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 3
·2699-2707
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IF 2.22
Zhang Jianxia,Li Haiying,Li Yu,Zhao Bing,Ju Xiangnan,Chen Wenbin,Lu Bingliang,Zeng Xiangan,Liu Li
This paper reports the preparation of an excellent acetone gas-sensitive material consisting of a Eu 3+ -decorated α-Fe 2 O 3 microflower (EFM) composite film by a simple hydrothermal and calcination method. For comparison, pure α-Fe 2 O 3 microflowers (PFM) are prepared with the same method. Scanning electron microscopy (SEM) images show that the samples are a loose 3D flower-like structure with many voids surrounded by many thin nanosheets. The structure of the samples was investigated using X-ray diffraction and X-ray photoelectron spectroscopy (XPS). The PFM and EFM gas sensors were systematically tested for gas sensitivity at an optimum temperature of 145 °C. The sensitivity of the EFM gas sensor with 50 ppm of acetone gas was 83, which was up to four times that of the PFM sensitivity (19). The EFM sensor had an extremely fast response time (4 s) and recovery time (38 s). Moreover, the minimum concentration of acetone that we could detect was 0.1 ppm with a response value of 2.1. The enhancement of gas sensitivity was attributed to the high catalytic activity of the Eu 3+ additive.
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MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Wenfeng Han,Haili Wang,Bing Liu,Xiliang Li,Haodong Tang,Ying Li,Huazhang Liu
With Al(NO 3 ) 3 ·9H 2 O as the Al precursor and PVDF as the fluorine source, freestanding AlF 3 sub-microspheres were fabricated following calcination , without the involvement of corrosive HF solution. With the varying of Al(NO 3 ) 3 ·9H 2 O to PVDF weight ratio, θ -AlF 3 and β -AlF 3 , α -AlF 3 were obtained respectively. The formation mechanism, morphology, surface properties and catalytic activities for the dehydrofluorination of 1,1,1,2-tetrafluoroethane to trifluoroethylene were investigated. During the fabrication process, Al(NO 3 ) 3 interacts with O=C bond in DMF. Meanwhile, DMF further interacts with CH 2 species in PVDF. Following calcination , PVDF decomposes to CO 2 and HF fluorinating Al species to AlF 3 . The growth of AlF 3 crystal and particle are confined by PVDF. Consequently, θ -AlF 3 , β -AlF 3 and α -AlF 3 are achieved. At 450 °C, HFC-134a conversion of 23% and reaction rate of 1.9 mmol g −1 h −1 are approached over θ -AlF 3 catalyst. The reaction rate is almost 3 times higher than that of β -AlF 3 and is 40% higher than that of high surface area α -AlF 3 prepared by sol-gel method. No significant deactivation is observed in time on stream of 40 h. The stability is attributed to the interaction of AlF 3 with carbon frame work. The present study provides a scalable and facile synthesis route for AlF 3 spheres with controllable phase structures.
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ACS Applied Bio Materials
·
2019
·
IF 0
Peihong Li,Chunling Zhang,Rui Li,Lijie Qu,Xueyan Dai,Yanlong Sui,Jiazi Hou
Pluronic F127 is a thermosensitive polymer that has been extensively studied and utilized in biomedicine. To improve the gelation properties of F127, α-cyclodextrin was introduced by physical interactions, such as forming inclusion complexes, hydrogen bond self-assembly, and hydrophobic interactions, to prepare F127−α-CD hydrogels. This study explored the temperature-dependent sol–gel transition behavior, gelation mechanism, interior morphology, and controlled release of the anticancer drug 5-fluorouracil. Results showed that hydrogel could be obtained at 1.0%–8.0% weight content of F127. The cross-linking points in this system were PEO−α-CD microcrystalline region and micelle with poly(propylene oxide) as the core. The network inside F127−α-CD hydrogels made it stable and conducive for controlled release. Therefore, this hydrogel is a promising drug release system.
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Molecular Medicine Reports
·
2019
·Vol. 20
·期 1
·529-538
·
IF 1.851
Shasha Chen,Feng Cai,Jirong Wang,Zhouxin Yang,Chi Gu,Guofu Wang,Genxiang Mao,Jing Yan
The abnormal aggregation of α‑synuclein (α‑syn), which is an important pathological feature of Parkinson's disease (PD), is cytotoxic to dopaminergic neurons and causes cellular damage and apoptosis. Salidroside (SAL) is the main active component of the traditional Chinese medicine Rhodiola rosea. Previous research has demonstrated that SAL exerts cellular protection against cell senescence and neurodegeneration. However, the role and mechanism of action of SAL in PD remain unclear. The present study used overexpression of the wild‑type and the A53T mutation of α‑syn to induce a neuronal model of PD in SH‑SY5Y cells, which led to neuronal toxicity and a reduced cell proliferation index. SAL increased the cell proliferation index of both PD model groups in a dose‑dependent manner. Additionally, SAL alleviated pathogenic phosphorylated (Ser129) α‑syn expression as well as the ratio of microtubule‑associated proteins 1A/1B light chain 3 (LC3)‑I to LC3‑II expression, which is related to autophagic function. Furthermore, the results suggested that the underlying mechanism for the SAL‑induced protection of PD model neurons may involve the preservation of autophagy, which attenuates the phosphorylation of α‑syn in neurons predominantly via mTOR/p70S6K, and is independent of the PI3K/Akt signaling pathway.
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Journal of Functional Foods
·
2019
·
IF 3.197
Mengting Wang,Jing Jiang,Jinhu Tian,Shiguo Chen,Xingqian Ye,Yaqin Hu,Jianchu Chen
α-Glucosidase is a key enzyme related to starch digestion and type-2 diabetes. In the present study, the inhibition effect and the underlying mechanism of Chinese bayberry leaves proanthocyanidins (BLPs) on α-glucosidase were investigated by enzyme kinetic analysis, multi-spectroscopy and molecular docking simulation. The results revealed that BLPs was a high potential noncompetitive-type inhibitor of α-glucosidase with the half maximal inhibitory concertation (IC50) value of 0.037 ± 0.001 mg mL −1 and acarbose equivalent (AE) of 517.01 mmol AE g −1 . What’s more, BLPs may interact with some amino acids surrounded in the allosteric site of α-glucosidase to form a complex driven by hydrogen bonding and hydrophobic interaction, and thus change the structure and microenvironment of α-glucosidase, leading to the decrease of activity of α-glucosidase. The present study suggested that BLPs as epigallocatechin-3-O-gallate (EGCG) polymers could be a novel α-glucosidase inhibitor and had potential to be further used in functional food or anti-diabetic drug.
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FOOD CONTROL
·
2019
·
IF 4.248
Wenjing Yan,Wenbin Chen,Umair Muhammad,Jianhao Zhang,Hong Zhuang,Guanghong Zhou
The aim of this work was to prepare a novel antioxidant film by incorporating α-tocopherol-chitosan nanoparticles (TOC-CSNPs) with chitosan/montmorillonite film (namely, TOC-CSNPs/CS/MMT), and investigate the antioxidant activity of TOC-CSNPs/CS/MMT film on sliced dry-cured ham in a period of 120 days at 4 °C. Positively charged TOC-CSNPs with the average sizes of 214 nm were prepared using TPP-initiated ionic gelation mechanism. The amount of TOC-CSNPs was optimized based on the changes of water vapor permeability (WVP), water solubility and swelling ratio of the film. The TOC-CSNPs/CS/MMT film showed 46.5% radical scavenging activity after 16 days of storage, which was 23 times and 27 times higher than that of CS/MMT and CS film, respectively. The antioxidant activity of TOC-CSNPs/CS/MMT film was evaluated by measuring the peroxide value (POV) and thiobarbituric acid reactive substances (TBARS) values of sliced dry-cured ham coated with the TOC-CSNPs/CS/MMT film-forming solutions. The results indicated that compared with the CS (0.42 g/100 g for POV, 0.65 mg/kg for TBARs) and CS/MMT (0.38 mg/kg for POV, 0.59 mg/kg for TBARs) films, the biceps femoris muscle of the sliced ham coated with TOC-CSNPs/CS/MMT film showed much lower values of POV (0.15 g/100 g) and TBARs (0.15 mg/kg) during 120 days of storage. These results provide a theoretical basis for developing efficient and long-term antioxidant approach, which is crucial for improving and enhancing the quality of food products.
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