Journal of the Taiwan Institute of Chemical Engineers
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2018
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IF 3.849
Jingru Guan,Jinze Li,Zhefei Ye,Dongyao Wu,Chongyang Liu,Huiqin Wang,Changchang Ma,Pengwei Huo,Yongsheng Yan
A series of La 2 O 3 /CeVO 4 @halloysite nanotubes composites were successfully fabricated by the hydrothermal method. The La 2 O 3 /CeVO 4 @halloysite nanotubes composites display outstanding photocatalytic activity for removing tetracycline (TC) solution under visible light irradiation (λ ≥ 420 nm). After irradiation 60 min, an optimized La 2 O 3 /CeVO 4 @halloysite nanotube composite exhibited a high photocatalytic activity (87.1%), which is 3.89 times higher than that of raw CeVO 4 (22.4%). The improvement of ternary composites performance is attributed to the Ce 3+ and Ce 4+ pairs in CeVO 4 . Besides, constructing heterojunctions between La 2 O 3 and CeVO 4 can inhibit the recombination of photoinduced electrons and holes, which is ascribed to the La 3+ as electron trap to enhance the charge transfer. According to the trapper experiments and Electron Spin Resonance (ESR) analysis, the h + and •O 2− are major reactive species during the degradation. In addition, the oxygen vacancies are in the ternary photocatalyssts. The photocatalytic degradation intermediates of the solution were identified by High performance liquid chromatography-Mass spectra (HPLC-MS).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Haiguan Yang,Junqi Zha,Peng Zhang,Yuemei Qin,Tao Chen,Fanggui Ye
A simple method was proposed for the preparation of CeVO 4 . The as-synthesized CeVO 4 was, for the first time, demonstrated to exhibit both peroxidase-like and oxidase-like activity, which catalyzes the oxidation of 3, 3′, 5, 5′-tetramethylbenzidine (TMB) to form a typical blue solution in the presence or absence of H 2 O 2 . Moreover, the mechanism of its dual-enzyme activity was investigated in detail. The Michaelis constant ( K m ) value for CeVO 4 (0.136 mM) was lower than that of horseradish peroxidase (0.424 mM) with TMB as the substrate. Interestingly, hydroquinone (H 2 Q), dihydroxybenzene isomer, undergoes reduction accompanying the oxidation of TMB by the CeVO 4 oxidase mimic along with a visible color change, while the other two dihydroxybenzene isomers, i.e., resorcinol (RC) and catechol (CC), do not. Based on these findings, a colorimetric platform was developed to discriminate H 2 Q from RC and CC. Under optimal conditions, a linear relationship between the H 2 Q concentration and absorbance was observed from 0.05 to 8 μM, and a limit of detection of 0.04 μM was achieved. Moreover, this colorimetric platform can selectively reveal H 2 Q concentrations in the presence of other dihydroxybenzene isomers.
研究领域:
生物化学
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环境科学
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材料科学
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DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 4
·659
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IF 3.9
Yuxin Wang,Yinxiu Jin,Minghan Jia,Hu Ruan,Xuefen Tao,Xuefeng Liu,Guang Lu,Xiaodong Zhang
CeVO4-V2O3composites were prepared by simple hydrothermal method, and the effects of ethylene glycol(EG) on the products were studied by XRD, N2adsorption–desorption, SEM, EDS, XPS, PL and UV-vis spectra. The characterization reveals a slight decrease in surface area and a slight enhancement of visible light absorption in the final sample, while the crystalline phase, morphology and separation efficiency of the collective carriers are severely affected by the EG. At the same time, the photocatalytic effect of CeVO4-V2O3composites was evaluated by the degradation rate of methylene blue (MB) under simulated visible light. The sample for 10 mL EG obtained the highest efficiency of 96.9%, while the one for 15 mL EG showed the lowest efficiency of 67.5% within 300 min. The trapping experiments and ESR experiment showed that the contribution of active species to the photocatalytic degradation of MB was ∙OH > h+> ∙O2−in descending order, and a possible degradation mechanism was proposed.Keywords:ethylene glycol;CeVO4-V2O3;methylene blue oxidation;visible light
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Ling Wang,Weiwei Meng,Zhangxing He,Wei Meng,Yuehua Li,Lei Dai
A mixed-potential type sensor using a new sensing electrode (SE) of CeVO 4 is developed for NH 3 detection. Well-dispersed Au nanoparticles are introduced into the CeVO 4 -SE by a simple immersion method to further improve the performances, especially the selectivity of the sensor. The sensor using the CeVO 4 -SE exhibits well response-recovery characteristics to NH 3 at 500–600 °C. Good linear correlations between the response potential difference of sensor and the logarithm of NH 3 concentrations are obtained. The sensor displays the negligible cross-sensitivities to CH 4 and CO 2 except NO 2 present in the gas mixture. After the introduction of the Au nanoparticles into the CeVO 4 -SE, the sensitivities of the sensor reach −78.9, −77.3 and −43.1 mV/decade at 500, 550 and 600 °C, respectively, which are much higher than those using the single CeVO 4 -SE. More importantly, the cross-sensitivity of the sensor with CeVO4/Au-SE to NO 2 is almost eliminated. Introduction of 1000 ppm NO 2 in sample gas containing 300 ppm NH 3 causes a response Δ V from 67.2 (for CeVO 4 -SE) to 4.6 mV (for CeVO 4 /Au-SE). The complex-impedance measurements display that introduction of Au can promote electrochemical oxidation reaction of NH 3 to TPBs. The results of the temperature-programmed desorption indicate that the improvement of the selectivity is attributed to the effective depression of NO 2 adsorption in the sensing electrode by introduction of Au.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Catalysis Science & Technology
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2016
·Vol. 6
·期 14
·5543-5553
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IF 5.287
Xin Zhao,Lei Huang,Supawadee Namuangruk,Hang Hu,Xiaonan Hu,Liyi Shi,Dengsong Zhang
A novel Zr–CeVO4/TiO2 catalyst was developed for the selective catalytic reduction (SCR) of NO with NH3. Both TiO2 nanosheets (TiO2-NS) and nanoparticles (TiO2-NP) with different crystal facets were used as supports for the catalyst. It was found that the TiO2-NS-supported catalyst showed much better activity, stability and H2O/SO2 durability than the TiO2-NP-supported catalyst. In particular, the catalyst loading amount was much lower than those of previously reported vanadate-based SCR catalysts. The crystal structures and morphologies were analysed by X-ray diffraction (XRD), Raman spectroscopy and (high-resolution) transmission electron microscopy ((HR)TEM). The redox properties, surface active species and acid sites of the catalysts were investigated through hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia and nitrogen oxide temperature-programmed desorption (NH3-TPD and NOx-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) experiments. The improved activity at lower temperature was due to the presence of more active oxygen species and Brønsted acid sites, as well as the formation of NO2 on the surface of the TiO2 nanosheets which have exposed (001) facets. The enhanced stability and H2O/SO2 durability of Zr–CeVO4/TiO2-NS was due to the limited formation of NH4NO3 and (NH4)2SO4/NH4HSO4. The excellent low operation temperature, low vanadium content and absence of WO3(MoO3) in this catalyst indicated that it has promising potential as a SCR catalyst for practical applications.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Nanomaterials
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2023
·Vol. 13
·期 2
·283
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IF 5.3
Yong Zhou,Guan Wang,Jiahao Wu,Zihao Chen,Chen Zhang,Ping Li,Yong Zhou,Wei Huang
Ternary orthovanadate compounds have received increasing attention due to their broad light absorption and diverse crystal structure. However, their multi-assembled crystal morphologies are limited mainly due to their initially polyatomic VO4groups. In this study, multi-prismatic hollow cubic CeVO4microstructures were fabricated by a one-step solvothermal method without any organic agents. The increase in wall thickness is in accordance with the radial direction of the quadrangular prism. Moreover, the overdose of the V precursor is favorable for the formation of hollow micro-cubic CeVO4, and the wall thickness changes from 200 to 700 nm. Furthermore, these CeVO4microstructures were applied to photocatalytic CO2reduction with a maximum CO generation rate of up to 78.12 μmol g−1h−1under visible light irradiation, which was several times higher than that of the other samples. This superior photocatalytic activity might be attributed to its good crystallinity and unique exposed interior structure. This study provides guidelines for the multi-assembled structure fabrication of ternary compounds and expands upon the exploration of the spatial structure of multivariate compounds.
研究领域:
材料科学
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化学
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环境科学
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DOI
高影响因子
IONICS
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2020
·Vol. 26
·期 10
·4859-4867
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IF 2.394
Yang Xiaoqing,Wu Huimin,Wang Shiquan,Cheng Fangyi,Feng Chuanqi,Liu Kuakun
The CeVO 4 /Fe 3 O 4 compound is successfully obtained by combining hydrothermal treatment and water bath process. The final product has been characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy techniques. The electrochemical properties of the expected compound were tested by a battery test system. The obtained CeVO 4 /Fe 3 O 4 composite shows higher specific capacity and better cyclability than pure CeVO 4 prepared under the same conditions. The initial discharge specific capacities of CeVO 4 and CeVO 4 /Fe 3 O 4 are 671.7 and 964.0 mAh·g −1 , respectively. After 100 cycles, CeVO 4 and CeVO 4 /Fe 3 O 4 still maintained their discharge capacities at 416.4 and 875.9 mAh·g −1 , representing capacity retention rates of 62.0% and 91.0%, respectively. The possible reaction mechanism for the CeVO 4 /Fe 3 O 4 composite is also discussed. The CeVO 4 /Fe 3 O 4 composite may be a prospective anode material for the lithium-ion battery.
研究领域:
材料科学
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电化学
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DOI
高影响因子
FUEL
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2022
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IF 8.035
Xinyu Li,Junjun Shi,Jiangang Wang,Lei Xi,Rui Sun,Fan Zhang,Xi Wu,Zhiyong Zhou,Zhongqi Ren
Removal of sulfur-containing compounds from fuel oil is one of the effective ways to reduce the emission of harmful substances and is of great environmental importance. In this work, a novel cerium-vanadium bimetallic catalyst supported by boron nitride nanosheets (CeVO 4 /BNNS) is reported for the efficient removal of sulfur-containing compounds from diesel fuel through catalyzing the molecular oxygen in the air. The successful preparation of the CeVO 4 /BNNS catalyst was demonstrated by SEM, XRD, and BET characterization, while its conformational relationship was also revealed. Synergistic effect of CeVO 4 bimetallic oxide together with the strong affinity of BNNS for sulfur-containing compounds achieved the efficient removal of of 4,6-DMDBT (100 %), DBT (99.62 %) and BT (71.29 %) within 3 h. The structure of CeVO 4 /BNNS catalyst remained basically unchanged after six times recycle, and the desulfurization rate maintained above 91 %, indicating a good stability. What’more, the free radical scavenging experiments and the analysis of oxidation products revealed the possible reaction mechanism, i.e., the activation of molecular oxygen by CeVO 4 /BNNS catalyst generated superoxide radicals, which oxidized DBT to DBTO 2 .
研究领域:
催化
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环境化学
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能源科学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Kun Ye,Xiangheng Niu,Hongwei Song,Linjie Wang,Yinxian Peng
In the present work, a novel alkaline phosphatase (ALP) activity colorimetric assay is proposed by integrating the oxidase-mimicking catalytic characteristic of CeVO 4 nanoparticles with the hexametaphosphate ion (HMPi) mediated electrostatic aggregation. The CeVO 4 nanoparticles exhibit good oxidase-mimetic catalytic ability to promote the 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation to TMBox, offering a significant change from colorless to blue. After a small amount of HMPi is added, the strong electrostatic interaction between the negatively charged HMPi species and the positively charged TMBox product leads to the aggregation of the latter, generating an aubergine HMPi-TMBox agglomerate. After the agglomerate is filtered out, the reaction solution turns to be almost colorless. When ALP is used to hydrolyze the HMPi species in advance, the electrostatic aggregation process is remarkably restrained, thus retaining the blue color of the CeVO 4 catalyzed TMB solution. According to the new sensing strategy, highly selective and sensitive analysis of ALP activity was realized, providing a wide detection range from 1 to 210 U/L and a detection limit of 0.68 U/L. Accurate measurement of ALP activity in clinical serum matrices was also validated, demonstrating the practicability of the proposed assay in practical applications.
研究领域:
生物化学
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医学检验
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DOI
PubMed
高影响因子
ChemPlusChem
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2024
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IF 3
Zhijun Zhu,Zhihong Yu,Guihuan Chen,Boyan Li,Aiju Li
Graphical The shuttle effect in lithium-sulfur batteries has been a thorny issue, for which researchers have conducted a lot of studies. Of the various directions attempted, separator modification is more convenient and easy to operate. In this paper, CeVO 4 /KB material is proposed to improve the separator and suppress the shuttle effect through its catalysis and adsorption. Catalytic adsorption of the rare earth metal Ce and transition metal V, efficient binding of oxides to polysulfides, and physical adsorption of porous KB prevent the transport of polysulfides to the anode and facilitate the reaction kinetics. Of course, the CeVO 4 /KB/PP batteries show brilliant performances. The CeVO 4 /KB/PP cell achieves 1059.9 mAh g −1 and 92.3 % capacity recovery rate when 3 C is reverted to 0.2 C, demonstrating the outstanding reversibility provided by the CeVO 4 /KB/PP separator. In the long cycle test, the initial specific capacity reaches 1200.9 mAh g −1 with a capacity retention rate of 86.5 % after 100 cycles at 0.2 C. Even at 3 C, CeVO 4 /KB/PP batteries reach 882.7 mAh g −1 in the first cycle with a capacity decay rate of 0.063 % per cycle on 1000 stable cycles. This work provides guidance on the selection of future separator modification materials and expects other work to be a breakthrough. Lithium-sulfur (Li−S) batteries display promise as redox-based batteries, where separators are an essential part of preventing short-circuiting of the positive and negative electrodes, while the shuttle effect is a critical issue of separators. Currently, commercial PP separators are weak in inhibiting the polysulfides shuttling, so modified separators are needed to inhibit it to improve the battery performance. This paper reports that CeVO 4 /KB composites act as separator materials. CeVO 4 /KB modified PP separators enhanced the adsorption of LiPSs, accelerated the rate of Li + migration, and catalyzed the conversion of LiPSs. These bring about the effect that CeVO 4 /KB/PP batteries reach 1200.9 mAh g −1 in the first cycle with a capacity retention rate of 86.5 % after 100 cycles at 0.2 C and reach 882.7 mAh g −1 of the initial cycle with a capacity decay rate of 0.063 % after 1000 cycles at 3 C. This work introduces rare earth metal vanadates to modify the separator, adding new ideas for designing separators for good-performance batteries.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Yu Du,Siqi Yu,Huangxian Ju
A quenching-typed electrochemiluminescence (ECL) immunosensing method was proposed for protein detection by the redox reaction of tungsten-based polyoxometalate nanoclusters (W-POM NCs) with free radical (O 2 •– ) as the intermediate of co-reactant H 2 O 2 . The immunosensor was constructed by co-immobilizing luminol loaded CeVO 4 /Au nanohybrids and capture antibody on an indium tin oxide electrode, which showed strong ECL emission in the presence of H 2 O 2 due to the catalysis of CeVO 4 /Au toward its electro-oxidation to produce O 2 •– via the reversible conversion between Ce 3+ and Ce 4+ . The W-POM NCs were encapsulated in the uniformly sized amino-silica nanosphere (SiO 2 ) to act as a label ( [email protected] 2 ) of the secondary antibody. Upon the sandwich-typed immunoreactions with the target, the W-POM NCs were introduced onto the immunosensor surface to reduce O 2 •– , and thus quenched the ECL emission of luminol-H 2 O 2 system. Using neuron-specific enolase (NSE) as a target, the proposed method showed a detection limit of 0.19 pg/mL and detectable range of 0.5 pg/mL to 18 ng/mL. The excellent performance of the proposed “ON-OFF” strategy demonstrated that the W-based quenching offers an effective tag for immunoassay of protein biomarkers.
研究领域:
分析化学
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生物化学
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纳米技术
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免疫学
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产品关联
DOI
PubMed
高影响因子
TALANTA
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2024
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IF 5.6
Fangyan Ji,Peilin Wang,Zhenrun Li,Kaixiang Ji,Dongyu Wang,Qiang Ma
Aggregation-induced emission (AIE) has been widely used in research on electrochemiluminescence (ECL) due to its excellent luminescence intensity. In this work, copper superparticles (Cu SPs) were used to construct ECL biosensor to detect the microRNA-103a (miRNA-103a) in triple-negative breast cancer (TNBC) tumor tissues. Firstly, GSH-capped copper clusters were used as precursors to prepare Cu SPs by the AIE effect. Compared with clusters, Cu SPs possessed higher luminescence performance and energy stability, making them an ideal choice for ECL nanoprobe. The film of PVDF-HFP/CeVO 4 NPs was constructed and modified with CPBA and GSH as the sensing interface (PCCG). The PCCG film displayed good conductivity and hydrophilicity, and desirable mechanical stability. Moreover, the PCCG film can induce high carrier mobility rates and dissociate large amounts of the co-reactant K 2 S 2 O 8 to enhance the ECL intensity of Cu SPs. As a result, the prepared ECL sensor with the catalyzed hairpin assembly (CHA) strategy was employed to quantify miRNA-103a in the range of 100 fM to 100 nM. The biosensor provided a novel analytical approach for the clinical diagnosis of TNBC.
研究领域:
生物传感器
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癌症诊断
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纳米技术
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生物医学工程
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分析化学
✓ 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）