ANALYTICAL LETTERS
·
2020
·
IF 1.467
Yunlong Zhang,Ya Ma,Lishi Wang
A polyfurfural film and copper nanoparticle (Cu NP) modified glassy carbon electrode (GCE) was prepared for the electrochemical determination of 2,4,6-trinitrotoluene (TNT). The polyfurfural film and Cu NPs were prepared by a one-step electrochemical polymerization method and a one-step electrochemical deposition method, respectively. In order to obtain the optimum electrochemical performance, the degree of polymerization of furfural, the deposition time and deposition potential of copper, the enrichment time and enrichment potential of TNT detection, and the pH of the detection solution were optimized. Under the optimal experimental conditions, the modified glassy carbon electrode provided significantly enhanced electro-catalytic activity for TNT with a wide linear detection range from 0.05 to 6 ppm and a low detection limit of 0.0416 ppm due to the excellent synergistic catalytic properties of the polyfurfural film and Cu NPs. The electrode also showed excellent anti-interference ability, stability and reproducibility. Moreover, satisfactory results were obtained when the modified electrode was used for the determination of TNT in tap water samples, showing n excellent prospects for practical applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22028-22038
·
IF 2.22
Peng Qirui,Yang Lu,Zhao Qiuying,Ma Yizhou,Ji Hongli,Qiu Jinhao
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co 3 [Co(CN) 6 ] 2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co 3 [Co(CN) 6 ] 2 appeared to significantly promote the interfacial coupling effect within P(VDF-HFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d 33 of ~ 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k 33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
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Marine Drugs
·
2021
·Vol. 19
·期 2
·92
·
IF 5.118
Yue Sui,Yue Gu,Yujing Lu,Chenxu Yu,Jie Zheng,Hang Qi
Fucoxanthin (FX), a natural carotenoid found in seaweed with multiple functional activities, is unstable with a poor water solubility that limits its utilization. This study aimed to improve FX’s stability and bioavailability via the nano-encapsulation of FX in polyvinylpyrrolidone (PVP)-coated[email protected]nanoparticles (NPs). The[email protected]NPs were evaluated in terms of their morphology, stability, encapsulation efficiency (EE), loading capacity (LC), and in vitro release to optimize the encapsulation parameters, and a 1:8 FX:PVP ratio was found to perform the best with the highest EE (85.50 ± 0.19%) and LC (10.68 ± 0.15%) and improved FX stability. In addition, the[email protected]NPs were shown to effectively deliver FX into Caco-2 cancer cells, and the accumulation of FX in these cancer cells showed pro-oxidative activities to ameliorate H2O2-induced damage and cell death. The[email protected]NPs could potentially become a new therapeutical approach for targeted cancer treatment.Keywords:fucoxanthin;nanoparticles;Caco-2 cells;pro-oxidation;targeted cell death
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高影响因子
INORGANIC CHEMISTRY
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2021
·
IF 5.165
Yijia Liu,Gengxin Zhang,Junben Huang,Xiaoma Tao,Guihua Li,Gemei Cai
Single-phase white-emission phosphors possess a judicious usage potential in phosphor-converted white-light-emitting diodes (WLEDs). Recently, numerous efforts have been made toward the development of new patterns of white-emitting phosphors that achieve excellent quantum yield, superior thermal stability, and applaudable cost effectiveness of WLEDs. Finding suitable single-component white phosphor hosts to provide an ideal local environment for activators remains urgent. Inspired by the original discovery of the promising host MgIn2(P2O7)2 (MIP) and its structural dependence on alkali-metal cations, we synthesized a brand-new phosphor host, SrIn2(P2O7)2 (SIP), via the traditional solid-state reaction. Its crystal structure was determined using an ab initio analysis and the Rietveld method. It belongs to a monoclinic unit cell with the space group C2/c. Besides, SIP exhibits a special layered three-dimensional framework in which the monolayer [SrO10]∞ was surrounded by a bilayer [In2P4O14]∞ made of the InO6 octahedra and P2O7 groups. A series of pure SIP:Tm3+,Dy3+ phosphors with tunable blue–white–yellow emission were prepared by adjusting the dopant concentration and utilizing the Tm3+–Dy3+ energy transfer. The daylight-white-emitting phosphor SIP:0.01Tm3+,0.04Dy3+ (the correlated color temperature is 4448 K) exhibits an abnormal thermal antiquenching property, and the emission intensity of 423 K reaches 103.7% of the initial value at 300 K. On the basis of the temperature-dependent lattice evolution and microenvironment analysis, the reduction of β and lattice distortion can lead to lower asymmetry of the activators and benefit the compensation of trapped-electron thermal activation. In this work, an integration study was carried out on the crystal structure of the new matrix, the occupation of the luminescent center, the interaction of different activators in the host, and the distortion degree of the local structure for the activators, which is of great practical sense for producing a novel single-matrix white phosphor possessing superior thermal endurance for UV-light-stimulated WLEDs.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Min Xia,Xuedong Wang,Jiaqi Xu,Qiuhui Qian,Ming Gao,Huili Wang
The organophosphate flame retardant, tris (1-chloro-2-propyl) phosphate (TCPP), is ubiquitous in environmental matrices; however, there is a paucity of information concerning its systemic toxicity. Herein, we investigated the effects of TCPP exposure on zebrafish neurodevelopment and swimming behavior to elucidate the underlying molecular mechanisms of neurotoxicity. Under TCPP gradient concentration exposure, the hatching rates were declined by up to 33.3% in 72 hpf, and the malformation rates increased from 15% to 50%. Meanwhile, TCPP led to abnormal behaviors including decreased locomotive activity in the dark and slow/insensitive responses to sound and light stimulation of larvae. TCPP caused excessive apoptosis and ROS accumulation in early embryonic development, with hair cell defects and structural deformity of neuromast. Abnormal expression of neurodevelopment ( pax6a , nova1 , sox11b , syn2a , foxo3a and robo2 ) and apoptosis-related genes ( baxa , bcl2a and casp8 ) revealed molecular mechanisms regarding abnormal behavioral and phenotypic symptoms. Chronic TCPP exposure led to anxiety-like behavior and excessive panic, lower capacity for discrimination and risk avoidance, and conditioned place preference in adults. Social interaction tests demonstrated that long-term TCPP stress resulted in unsociable, eccentric, lonely and silent behaviors in adults. Zebrafish memory and cognitive function were severely reduced as concluded from T-maze tests. Potential mechanisms triggering behavioral abnormality were attributed to histopathological injury of diencephalon, abnormal changes in nerve-related genes at transcription and expression levels, and inhibited activity of AChE by TCPP stress. These findings provide an important reference for risk assessment and early warning to TCPP exposure, and offer insights for prevention/mitigation of pollutant-induced nervous system diseases.
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高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 8
·2061-2067
·
IF 6.569
Shiwei Liu,Bingbing Zhang,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Ultraviolet nonlinear optical (UV NLO) crystals are the key and basic materials for solid-state lasers. Phosphates as UV NLO crystals are limited in practical applications due to their weak second-harmonic generation (SHG) response. In this work, two non-centrosymmetric pyro-phosphates of K3SrBi(P2O7)2 and Rb3SrBi(P2O7)2 have been synthesized by a high-temperature solution method. Systematic property measurements show that they both have short UV cut-off edges (∼240 nm) and large SHG responses (4 × KDP for K3SrBi(P2O7)2 and 2.1 × KDP for Rb3SrBi(P2O7)2). Thus, they are both promising UV NLO candidates. In particular, K3SrBi(P2O7)2 shows the strongest SHG response in the family of A3BBi(P2O7)2 (A = K, Rb, B = Sr; A = Rb, Cs, B = Ba, Pb), which is about twice higher than that of isomorphic Rb3SrBi(P2O7)2. The study of the structure–property relationship shows that the synergistic effect of P2O7 dimers and BiO6 polyhedra is the main contribution to their excellent NLO properties. And better orientations of P2O7 dimers and larger distortion of BiO6 units play important roles in enhancing the SHG response of K3SrBi(P2O7)2.
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Molecular Catalysis
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2020
·
IF 3.687
Ping Wei,Peng Chao,Yao-Ying Wang,Dong-Li Li,Qing-Jian Zou,Min-Hua Zong,Wen-Yong Lou
( S )-1-Phenyl-1,2-ethanediol (PED) is a vital chiral block in specialty chemical industries. The biotransformation of 2-hydroxyacetophenone (2-HAP) to ( S )-PED was conducted successfully catalyzed with BL21(DE3)(pETDuet- gst -mut- accr - gdh ) which harboring a carbonyl reductase mutant (mut-AcCR). The catalytic activity of the biocatalyst was 15.9 times higher than the recombinant cells harboring original AcCR. 250 mM 2-HAP was reduced, under optimal conditions, and the yield and space-time yield were 95.2 % and 1.89 M/d in the buffer system. Then C 4 MIMI·PF 6 was chosen to be the second phase to improve the catalytic efficiency, and the substrate concentration was increased to 450 mM in the C 4 MIMI·PF 6 /buffer system. After a reaction duration of 3 h, the product yield was over 92 %, and the space-time yield increased to 2.88 M/d which was 1.52 folds higher than that in the buffer system. Also, the product e.e. was over 99 % consistently. Overall, the preparative scale reduction of 2-HAP (450 mM) in C 4 MIMI·PF 6 /buffer system was conducted with promising result. The developed effective C 4 MIMI·PF 6 /buffer system of asymmetric reduction catalyzed by BL21(DE3)(pETDuet- gst -mut- accr - gdh ) will promote the preparation of the enantiomeric pureity chiral alcohol at industrial scale.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Ding Wang,Lifeng Deng,Haijie Cai,Jialin Yang,Liping Bao,Yongheng Zhu,Xianying Wang
As a foodborne bacterium, Listeria monocytogenes (LM) can cause serious diseases and even death to weak people. 3-Hydroxy-2-butanone (3H-2B) has been proven to be a biomarker for exhalation of LM. Detection of 3H-2B is a fast and effective method for determining whether the food is infected. Herein, we present an excellent 3H-2B gas sensor based on bimetallic PtCu nanocrystal modified WO3 hollow spheres. The structure and morphology of the PtCu/WO3 were characterized, and their gas sensitivities were measured by a static testing method. The results showed that the sensor response of WO3 hollow spheres was enhanced by about 15 times after modification with bimetallic PtCu nanocrystal. The maximum response value of the PtCu/WO3 sensor to 10 ppm 3H-2B is as high as 221.2 at 110 °C. In addition, the PtCu/WO3 sensor also exhibited good selectivity to 3H-2B, fast response/recovery time (9 s/28 s), and low limit of detection (LOD < 0.5 ppm). Furthermore, the sensitivity mechanism was studied by monitoring the reaction products by gas chromatography–mass spectrometry. The excellent gas-sensing performance can be attributed to the synergy between PtCu and WO3, including the unique spillover effect of O2 on PtCu nanoparticles, the regulated depletion layer by p-type CuxO to n-type WO3, and their selective catalysis to 3H-2B. Hence, this work offers the rational design and synthesis of highly efficient sensitive materials for the detection of LM for food security.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Fangbin Fan,Xiaobin Nie,Chao Fan,Xiaojing Liang,Xiaofeng Lu,Yong Guo
In this paper, L (+)-Cysteine (L-Cys) and 5-norbornene-2-carboxylic acid (5-N-2-CA) were modified on the silica spheres by cross-linking polymerization and thiol-ene click reaction. The Cys-Si-NCA was characterized by scanning electron microscopy, nitrogen sorption porosimetry , thermogravimetric analysis and other characterization methods. The results indicated that the colume had a regular spherical shape with porous surfaces and particle sizes mainly ranging from 4.5 to 5.5 μm. The surface area of the Cys-Si-NCA microspheres was 328.68 m 2 g −1 , and their respective average pore size was 9.27 nm. Furthermore, the colume exhibited excellent stabilities and reproducibility. Experimental results demonstrate that this new stationary phase can facilitate the separation of sulfonamides, nucleosides and nucleobases compounds in hydrophilic chromatographic (HILIC) conditions. In addition to being able to attenuate the peak tailing of separation, it can also be used for quantitative analysis of creatinine in urine. We also give the temperature and pH ranges of separation on Cys-Si-NCA column. The successful synthesis of the Cys-Si-NCA stationary phase provides foundation for the application of this kind of materials in liquid chromatography (LC).
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yaoyao Huang,Huaili Zheng,Hong Li,Chun Zhao,Rui Zhao,Siqi Li
The separation and recovery of uranium resources from nuclear waste solutions is important for achieving uranium reuse and environmental protection. In this study, a novel adsorbent, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA)-decorated chitosan-coated magnetic silica nanoparticles, was fabricated and applied to the highly selective adsorption of uranium from aqueous solution. Selective sorption in a multi-ion solution (pH 4.0) containing 14 coexisting cations resulted in CoFe 2 O 4 @SiO 2 @CS-PBTCA showing an excellent uranium adsorption capacity of up to 83.16 mg g −1 , which was much higher than that of ungrafted CoFe 2 O 4 @SiO 2 @CS (29.99 mg g −1 ). The adsorbent also exhibited higher acid resistance than uncoated silica adsorbent under pH 1.0 conditions, with CoFe 2 O 4 @SiO 2 @CS-PBTCA showing barely any iron and cobalt leaching, while CoFe 2 O 4 @CS-PBTCA showed iron and cobalt leaching amounts of 2.97 and 0.93 mg L −1 , respectively. The desorption experiment used 0.2 M PBTCA (pH 1.0) as eluent, with the results showing that uranium ions were readily and rapidly desorbed. Furthermore, CoFe 2 O 4 @SiO 2 @CS-PBTCA maintained outstanding stability and adsorption performance after five reuse cycles. The mechanism for U(VI) removal was investigated by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, with the results suggesting that the adsorbent binds to uranium mainly though oxygen atoms of carboxyl groups and phosphonic groups in PBTCA. This strategy shows strong potential for developing a variety of novel, highly active, acid resistance, and reusable immobilized functional magnetic materials for effective separation of uranium from a multi-ion solution.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 2
·224-230
·
IF 2.69
Si Zhihao,Zhang Xin,Zuo Miao,Wang Tao,Sun Yong,Tang Xing,Zeng Xianhai,Lin Lu
2, 5-furandicarboxylic acid (FDCA) is a one of the most promising biomass-derived chemicals to substitute the non-renewable terephthalic acid as the monomer for producing polyethyleneterephthalate. At present, the oxidation of HMF is regarded as a prevalent way to prepare FDCA. Nevertheless, the isolation and storage of HMF is still a challenge. Herein, based on the higher stability of 5-formyloxymethylfurfural (FMF) than 5-hydroxymethylfurfural (HMF), we present an effective preparation route to prepare FDCA by substituting HMF with FMF as feedstock. A complete conversion of FMF and a 93.55% selectivity of FDCA were obtained in the mixed solvent of water and 1, 2-dioxane using Ru/C as catalyst and O 2 as oxidant. An improved process was developed for preparing FDCA using FMF as feedstock. The investigation of conversion pathway showed that FMF and HMF were simultaneously oxidized to 2, 5-diformylfuran (DFF) in a case of the existence of the reversible equilibrium between FMF and HMF. Then DFF was oxidized to 5-formyl-2-furancarboxylic acid (FFCA). Subsequently, FFCA was oxidized to FDCA. In this process, the oxidation of FFCA to FDCA was determined as the rate-determining step. Furthermore, appropriate alkalinity favored the selectivity of FDCA and the conversion of FMF.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 6
·066515
·
IF 3.721
Wenjing Liu,Zhiyuan Wu,Pei Dong,Feifei Lin,Meng Zang,Shuai Qiao,Yingying Gu,Jinqiang Zhang,Shuaijun Wang,Chaocheng Zhao
Developing effective and economical materials for emerging electrochemical remediation of persistent organic pollutants has attracted significant research interest. In this study, a heteromorphic self-standing nickel foam@Ni(OH)2/MnO2 (NF@Ni(OH)2/MnO2) electrode was synthesized by a simple solvothermal method and employed for the remediation of persistent organic pollutants. The prepared NF@Ni(OH)2/MnO2 electrode exhibited better performance for the electro-catalytic degradation of tetracycline (TC) than that of the NF and NF@Ni(OH)2. In optimized conditions, the NF@Ni(OH)2/MnO2 electrode exhibited the highest TC degradation efficiency (90%) and total organic carbon(TOC) removal (59.02%) among the prepared electrodes. In addition, a higher mineralization current efficiency (MCE) and lower energy consumption (EC) for the NF@Ni(OH)2/MnO2 electrode was achieved. The enhancement occurs primarily because the active MnO2 anchored to the porous and highly conductive Ni foam substrate surface boosts the electron transfer and the generation of hydroxyl radicals, as proved by a free radical trapping experiment and fluorescence spectrum analysis. This study suggests the possibility of a new paradigm in designing effective and practical electro-Fenton electrodes for environmental remediation.
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