MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Zheng Delun,Chen Min,Peng Jingjun,Chen Jiayang,Chen Tufeng,Chen Yaowen,Huang Linjia,Gao Wenhua
HKUST-1 MOFs and its derivative HKUST-CuO were coupled with TiO 2 nanoparticles to form the heterogeneous composites of HKUST-1/TiO 2 and HKUST-CuO/TiO 2 based on their well-suitable bandgap energies (Eg). Compared with mono-component HKUST-1 or HKUST-CuO, the prepared composites displayed photoelectrochemical (PEC) response due to the synergistic effect from their heterogeneous structure. Higher photocurrent response was obtained on HKUST-CuO/TiO 2 -modified ITO electrode (HKUST-CuO/TiO 2 /ITO), which could be attributed to the hollow structure with a thin shell of HKUST-CuO greatly enhancing visible spectra harvesting. The CuO component in HKUST-CuO not only could accelerate electron transfer on the heterojunction interface but also effectively separate the photo-generated charge carriers (e −1 /h + ). Based on the excellent PEC performance of prepared photoactive composite material, under visible-light excitation ( λ ≥ 420 nm) and with a working potential of 0 V (vs. Ag/AgCl), the S1 (probe DNA)/HKUST-CuO/TiO 2 /ITO PEC platform was successfully fabricated for colitoxin DNA detection without using ascorbic acid (AA) as an electron donor. Compared with the analysis results on S1/HKUST-1/TiO 2 /ITO electrode, S1/HKUST-CuO/TiO 2 /ITO displayed a wider linear response range from 1.0 × 10 −6 to 4.0 × 10 −1 nM with a lower detection limit of 3.73 × 10 −7 nM (S/ N = 3), the linear regression equation was Δ I (10 −6 A) =0.5549–0.1858 log ( C S2 /M), which confirmed the HKUST-CuO could improve sensitivity because of its prominent PEC property. The relative standard deviation (RSD) of the PEC sensor for target DNA detection of 2.0 × 10 −4 nM was 7.4%. The proposed DNA biosensor also possessed good specificity and stability. Hence, this reported work was a promising strategy for molecular diagnosis in the bio-analysis field. Graphical abstract
(A) Schematic illustration of the preparation process of the proposed PEC biosensors for colitoxin DNA detection. (B) The preparation process of HKUST-1 and HKUST-CuO.
研究领域:
生物分析
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材料科学
·
分子诊断
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Kuangjun Li,Chunxia Huang,Tianyou Chen,Suxing Jiao,Jing Wu
Background Chemiluminescence (CL) analysis, characterized by its simple instrumentation, high signal-to-noise ratio, wide linear range, and minimal background interference, has garnered increasing attention from researchers. Nanomaterials (NMs) have been explored to enhance CL intensity. Notably, sub-1 nanometer scale NMs are considered to hold significant untapped potential due to their size effects. The application of these sub-1 nanometer NMs in enhancing CL is anticipated to yield favorable results. Additionally, the low water solubility and bioavailability of quercetin glycosides lead to their presence in bodily fluids at only trace levels, highlighting the urgent need for efficient and rapid detection methods. Results In this work, phosphomolybdic acid (PMA) was incorporated into CuO to synthesize sub-1 nanometer CuO-PMA nanosheets (SNSs) using a cluster-core co-assembly strategy. Conformational and structural characterization confirmed the successful synthesis of these nanosheets. The CuO-PMA SNSs were employed to enhance the CL emission of the luminol-H 2 O 2 system, resulting in an increase of over 1000 times. The catalytic properties of CuO-PMA SNSs significantly facilitated the decomposition of H 2 O 2 , leading to an enhanced production of reactive oxygen species, which in turn induced the CL enhancement. Given that the antioxidant effect of quercetin would consume the reactive oxygen species generated during the catalysis, a decrease in CL intensity was anticipated. A CL sensor for quercetin detection was developed based on the CuO-PMA SNSs-luminol-H 2 O 2 system, demonstrating a strong linear relationship (R 2 = 0.9969) and a low detection limit of 0.31 nM. Significance This research provides a strategy to enhance the CL intensity of the luminol-H 2 O 2 system by using CuO-PMA SNSs, offering a highly sensitive assay for detecting quercetin concentrations. The method is characterized as a simple and cost-effective analytical strategy making CL analysis very attractive for chemical analysts.
研究领域:
分析化学
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纳米材料科学
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生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Green Chemical Engineering
·
2021
·
IF 0
Yunchang Fan,Di Wu,Sheli Zhang,Lei Zhang,Wei Hu,Chunyan Zhu,Xueyun Gong
The hydrophobic ionic liquids/water two-phase system was developed to prepare CuO nano particles. The catalytic activity of the synthesized CuO was investigated by photodegradation of 4-nitrophenol (4-NP) in the presence of H 2 O 2 under visible light irradiation. The optical properties of the synthesized CuO were characterized by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). Experimental results indicated that the band gap energy ( E g ), conduction band edge potential ( E CB ) and valence band edge potential ( E VB ) of the synthesized CuO were 1.37 eV, 0.625 eV and 1.995 eV, respectively. A degradation efficiency of 4-NP (4.8 mmol L −1 ) as high as 95.3% could be achieved under the conditions of pH 6.0, 0.48 g L −1 of CuO dosage, 1.4% of H 2 O 2 dosage and 90 min of degradation time. The synthesized CuO exhibited poor catalytic activity under alkaline conditions due to the disassociation of 4-NP, which elevated the repulsion between CuO and the 4-NP anions. The synthesized CuO nano particles exhibited higher catalytic activity compared with the catalysts reported in literature. Furthermore, the synthesized CuO nano particles could be reused at least six times without decreasing their catalytic activity. Compared with the traditional hydrothermal method, mild operating conditions and time saving are the advantages of the developed method for the preparation of CuO.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yafei Guo,Guodong Wang,Xi Yao,Bingqian Liu
Several NiO–CuO–CeO 2 catalysts were prepared via different methods and characterized by different techniques. Structure-activity relationships of the catalysts were demonstrated, and the effect of preparation methods on CO oxidation behaviors was illustrated. Catalytic results evidenced that the NiCuCe-CP and NiCuCe-SG catalysts prepared by co-precipitation and sol-gel methods exhibited better CO oxidation activities and kinetic performance, as evidenced by their lower T 50 values (102 °C and 100 °C) and apparent activation energies (48.80 and 59.28 kJ/mol) as well as higher reaction rates (3.84 and 3.45 μmol/g/s). The XRD and HRTEM results suggested that the active species showed uniform dispersion with minimum crystallite size in the desired catalysts. The XRD, XPS , H 2 -TPR and Raman analysis suggested the formation of Ce 1- x Cu x O 2- δ and Ce 1- x Ni x O 2- δ solid solutions, indicating that the co-precipitation and sol-gel methods reinforced the interactions amongst the ternary metal oxides . This would afford the catalysts more oxygen vacancies for boosted CO oxidation activity. The mechanism was then proposed with the dual synergetic effects in solid solutions for facilitated oxygen mobility and the amorphous active metal oxides for promoted CO chemisorption . The desired NiCuCe-CP and NiCuCe-SG catalysts show potential application for CO abatement in closed-loop air revitalization.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Zheng Yang,Qian Rong,Ting Bao,Mingzhi Jiao,Lebao Mao,Xiaojie Xue,Wei Wen,Zhen Wu,Xiuhua Zhang,Shengfu Wang
Among one-dimensional nanostructures , copper oxide nanotubes (CuO NTs) have aroused wide attention due to their prominent performance in electronic, optical and energy conversion devices. However, the lack of suitable synthetic methods limits its large-scale production and broad application. Here, a new method for preparing well-dispersed CuO NTs with simple operation, mild conditions and low cost was established by integrating the synergy effect of H + corrosion with the protection of CH 3 COO − and surfactant. Different surfactants were applied to regulate the synthetic process and polyvinylpyrrolidone-protected CuO NTs (PVP-CuO NTs) owned the best uniform morphology and dispersibility. The synthesis mechanism was deeply investigated to provide guidance for the synthesis of other oxide nanotube structures. As an excellent semiconductor material , CuO NTs can be excited to produce multiple electron-hole pairs under light irradiation , thus catalyzing the reduction of H 2 O 2 . CuO NTs modified photocathode realized photoelectrochemical sensing of H 2 O 2 in the range of 1 μM-1 mM. Interestingly, the prepared CuO NTs exhibited wonderful mimic enzyme properties, providing the possibility of colorimetric sensing and point-of-care detection. The colorimetric sensor for H 2 O 2 detection had a linear relationship from 2 μM to 150 μM with a detection limit of 0.62 μM. The successful construction of the two sensing modes not only demonstrated the excellent performance of multifunctional CuO NTs, but also indicated its great promise in practical application.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wentao Hao,Panpan Xu,Li Sun,Ensi Cao
Co-doped TiO 2 ceramics exhibit great potential as high-performance giant dielectric materials. However, their excessively high sintering temperature renders them unsuitable for economical industrial production. The giant permittivity of these ceramics is closely correlated with the concentration of Ti 3+ ions present. Adding a sintering aid to the ceramics is an effective method to reduce the sintering temperature. CuO, a common sintering aid, not only reduces the sintering temperature but also potentially enhances the Ti 3+ ions concentration through the multivalence of Cu element, further optimizing their giant dielectric properties. Therefore, the effects of CuO addition on the sintering condition, microstructure, and dielectric properties of In and Nb co-doped TiO 2 ceramics were investigated. The results indicate that CuO effectively lowers the sintering temperature of the ceramics. However, the presence of a large number of Cu + ions inhibits the formation of Ti 3+ ions, resulting in the disappearance of their giant dielectric properties. Upon annealing at 1150 °C for 2 h in air, the Ti 3+ ions concentration significantly increases in the ceramics, consequently restoring their giant dielectric properties. Additionally, a new dielectric relaxation appears around 100 kHz, likely arising from the conductivity difference between the shallow layers and cores of grains induced by annealing. Furthermore, annealing enhances the grain boundary resistance, thereby reducing the low-frequency dielectric loss of the ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Li Fei,Zheng Wanjun,Jin Liequn,Cao Huazhen
Overusing fossil energy sources has led to global warming, seriously risking the habitability of the environments on which people depend. Photoelectrocatalytic (PEC) reduction of carbon dioxide (CO2) is a promising strategy to reduce CO2 into high-value-added chemicals and fuel products. However, photoelectrocatalysis faces problems related to low CO2 conversion efficiency and uncontrollable product complexity. This study reports a CuO–MoO3/TiO2NTs composite photoelectrode prepared by pulsed electrodeposition for the photoelectrocatalytic (PEC) reduction of CO2 to ethanol in a 1 M NaHCO3 medium under visible light irradiation and at an applied potential of −0.3 V vs. SCE. Molybdenum trioxide plays a regulatory role in the structure and properties of the photoelectrode. Photoluminescence analysis suggests that this occurs by introducing new energy levels between those of CuO and TiO2, which reduces the bandgap energy from 1.42 eV to 1.17 eV, promotes electron–hole pair separation, and significantly boosts photoelectrocatalytic activity. In addition, experimental results show that the doping of MoO3 enhanced the adsorption strength of the intermediate products and promoted the C–C coupling process. The optimized composite photoelectrode achieves 89% Faraday efficiency for ethanol at −0.5 V versus SCE (saturated calomel electrode). No new phases were generated during the catalytic process, confirming the stability of the CuO–MoO3/TiO2NTs composite photoelectrode.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Huanhuan Xu,Wei Fang,Lan Xu,Fujuan Liu
Composite nanofiber membranes (CNFMs) loaded with CuO/ZnO (CZCNFMs) have important applications in a series of organic and industrial catalytic reactions because of nanoeffects of the nanofibers and the peculiar performances of semiconductor oxides. In this work, CZCNFMs with different mass ratios of Cu to Zn were successfully fabricated in batches using modified bubble electrospinning (MBE), a heat treatment method, and a hydrothermal method. The influences of the mass ratio of Cu to Zn on the morphologies, structures, and properties of the CNFMs were studied, and the obtained CNFMs with different mass ratios of Cu to Zn were applied to the photodegradation of methyl orange (MO) and methylene blue (MB). The results showed that when the mass ratio of Cu to Zn was 5:5, the fabricated CNFM had better morphology, structure, and mechanical properties and had the best degradation effects on MO and MB. In addition, the principal active substances produced during the photodegradation of MO were defined by free radical capture experiments, and the influences of the pH value of the MO solution on the photocatalytic activity of the CNFMs with the optimal mass ratio of 5:5 were discussed.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 10
·1-12
·
IF 2.184
Miao Lingzhan,Wang Chao,Hou Jun,Wang Peifang,Ao Yanhui,Li Yi,Lv Bowen,Yang Yangyang,You Guoxiang,Xu Yi
Abstract Stability of engineered nanoparticles in aquatic environment is an essential parameter to evaluate their fate, bioavailability, and potential toxic effects toward living organisms. As CuO NPs enter the wastewater systems, they will encounter extracellular polymeric substances (EPS) from microbial community before directly interacting with bacterial cells. EPS may play an important role in affecting the stability and the toxicity of CuO NPs in aquatic environment. In this study, the influences of flocculent sludge-derived EPS, as well as model protein (BSA) and natural polysaccharides (alginate) on the dissolution kinetics and colloidal stability of CuO NPs were investigated. Results showed that the presence of NOMs strongly suppressed CuO NPs aggregation, confirmed by DLS, zeta potentials, and TEM analysis. The enhanced stability of CuO NPs in the presence of EPS and alginate were attributed to the electrostatic combined with steric repulsion, while the steric-hindrance effect may be the predominant mechanism retarding nano-CuO aggregation for BSA. Higher degrees of copper release were achieved with the increasing concentrations of NOMs. EPS are more effective than alginate and BSA in releasing copper, probably due to the abundant functional groups and the excellent metal-binding capacity. The ratio of free-Cu 2+ /total dissolved Cu significantly decreased in the presence of EPS, indicating that EPS may affect the speciation and Cu bioavailability in aqueous environment. These results may be important for assessing the fate and transport behaviors of CuO NPs in the environment as well as for setting up usage regulation and treatment strategy. Graphical Abstract
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yaxin Xu,Peipei Li,Xiaojun Hu,Haoyu Chen,Ying Tang,Yu Zhu,Xiaohua Zhu,Youyu Zhang,Meiling Liu,Shouzhuo Yao
Nanozymes are considered as ideal substitutes for nature enzymes; however, the enzyme activity and the relevant detection sensitivity in actual samples still need to be further improved. Here, a nanomaterial of CuO NP-POM composed of polyoxometalate (POM) decorated with copper oxide nanoparticles (CuO NPs), which possessed tetraenzyme mimetic activities including oxidase (OXD)-, peroxidase (POD)-, catalase (CAT)-, and glutathione peroxidase (GPx)-like activities was developed. The corresponding catalytic performances, mechanisms, and kinetics were systematically investigated. Based on the POD-like activity of a CuO NP-POM nanocomposite, a colorimetric sensing platform for ascorbic acid (AA) was built with the detection limit of 15 nM, depending on the fact that AA can efficiently react with the oxidation product of TMB, which was catalyzed by CuO NP-POM on the basis of the POD-like activity. A simple fluorometric sensor for Fe2+ was developed on the basis of the GPx-like activity of CuO NP-POM with the detection limit of 8.0 nM. CuO NP-POM can weaken the fluorescence of the isoindole derivative derived from GSH and o-phthalaldehyde (OPA) due to the excellent GPx-like activity, which can accelerate the catalysis of GSH into GSSG in the presence of H2O2. However, in the presence of Fe2+, the fluorescence was recovered owing to the fact that the Fenton reaction between Fe2+ and H2O2 could reduce GSSG into GSH. The proposed colorimetric and fluorometric sensors have been successfully applied in detecting AA and Fe2+ in several food and biological samples. This work not only developed a nanocomposite with enhanced multinanozyme activity but also offered rapidly detection methods for the analysis of specific targets via the special nanozyme activities.
研究领域:
生物化学
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shuai He,Guicheng Jiang,Qian Wang,Lang Bian,Bin Yang
Lead zirconate titanate (PZT) based piezoelectric ceramics are applied in ultrasonic transducers and multilayer actuators fields universally. Excellent piezoelectric properties of PZT-based ceramics of low sintering temperature are crucial for the applications of high-power motors and multilayer piezo-actuators due to the reduction of cost and energy consumption. In this paper, a ternary solid-solution ceramic system 0.05Pb(Mn 1/3 Sb 2/3 )O 3 -0.47PbZrO 3 -0.48PbTiO 3 (PMS-PZT) was studied. A new complex additive composed of SiO 2 -Li 2 O 3 -CuO was doped into the PMS-PZT ceramics. The doping of CuO and Li 2 O 3 was discovered to be able to lower the sintering temperature and remain electric properties efficiently, while the doping of SiO 2 can decrease the grain size and increase the density. All ceramic samples were fabricated by solid-phase reaction method and sintered in the low temperature range from 800 °C to 1000 °C. The phase structure, morphology of natural surface and electrical properties of ceramics doped by 0.5 wt% additive were characterized. The 0.5 wt% additive doped PMS-PZT ceramics exhibit remarkable comprehensive piezoelectric properties sintered at 900 °C ( d 33 = 343 pC/N, Q m = 1016, T c = 328 °C, tan δ = 0.4 % (at 25 °C), ε r = 1344, d 33 * = 490 pm/V). The sintering temperature 900 °C is significantly below the melting point of Ag (961.9 °C) and Cu (1083.4 °C), so the more cost-effective Cu internal electrodes and Ag rich Ag/Pd electrodes can be used to substitute the expensive Pd rich Ag/Pd internal electrodes in the production of devices composed of multilayer ceramic. The research of this work provides an important candidate additive for the applications of high-performance transducers and multilayer actuators with low cost.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 15
·5718
·
IF 4.6
Xiya Yang,Xun He,Lang He,Jie Chen,Longcheng Zhang,Qian Liu,Zhengwei Cai,Chaoxin Yang,Shengjun Sun,Dongdong Zheng,Asmaa Farouk,Mohamed S. Hamdy,Zhaogang Ren,Xuping Sun
Seawater electrolysis has great potential to generate clean hydrogen energy, but it is a formidable challenge. In this study, we report CoFe-LDH nanosheet uniformly decorated on a CuO nanowire array on Cu foam (CuO@CoFe-LDH/CF) for seawater oxidation. Such CuO@CoFe-LDH/CF exhibits high oxygen evolution reaction electrocatalytic activity, demanding only an overpotential of 336 mV to generate a current density of 100 mA cm−2in alkaline seawater. Moreover, it can operate continuously for at least 50 h without obvious activity attenuation.Keywords:hierarchical CuO@CoFe-LDH nanoarray;alkaline seawater electrolysis;oxygen evolution reaction
研究领域:
材料科学
·
电化学
✓ 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）