ANALYST
·
2017
·Vol. 142
·期 20
·3986-3992
·
IF 3.885
Hao-Hua Deng,Xiao-Qing Zheng,Yan-Yu Wu,Xiao-Qiong Shi,Xiu-Ling Lin,Xing-Hua Xia,Hua-Ping Peng,Wei Chen,Guo-Lin Hong
We herein report the intrinsic alkaline peroxidase-like activity exhibited by CuO nanoparticles when 3-(4-hydroxyphenyl)propionic acid was employed as a substrate. Based on this observation, a fluorometric assay method with a low detection limit of 0.81 μM was established for H2O2 determination under alkaline conditions. Notably, ammonia was found to inhibit the alkaline peroxidase-like activity of the CuO nanoparticles. Thus, a sensing platform for the determination of urea and urease was successfully constructed, with the limits of detection for urea and urease being 27 μM and 2.6 U L−1, respectively. This platform was then applied for the detection of urea in human urine and urease in soil, which yielded satisfactory results. These results suggest that it is possible to extend the catalytic potential of peroxidase and its mimetics from acidic and neutral conditions to include activity in alkaline media as well. Furthermore, this strategy is a novel method for the analysis of urea and urease. The assay developed in this work is facile, inexpensive, convenient, and highly selective and sensitive. Therefore, it is expected that this system can serve as a template for the development of similar enzyme nano-mimics.
研究领域:
生物化学
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纳米生物学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Mingjie Huang,Yi Han,Wei Xiang,Chen Wang,Juan Mao,Tao Zhou,Xiaohui Wu,Han-Qing Yu
The nucleophilic superoxide radical (O2•–)-based dehalogenation reaction shows great potential to degrade the toxic halogenated organic compounds (HOCs). But such an O2•–-mediated reductive reaction often suffers from the competition of the secondary oxidative species (e.g., •OH), leading to inferior electron efficiency and possible disinfection byproduct formation. Here, an O2•–-dominant ultrafast dehalogenation system is developed via molecular O2 activation by the oxygen vacancy (OV)-rich CuO nanoparticles (nCuO). The nCuO delivers a remarkable dechlorination rate constant of 3.92 × 10–2 L min–1 m–2 for 2,4-dichlorophenol, much higher than that of the conventional zerovalent (bi)metals. The absorbed O2 on the nCuO surface is exclusively responsible for O2•– generation, and its reactivity increases with the elevated OV content because of the enhanced orbital hybridization between the O p- and Cu d-orbitals. More importantly, the ubiquitous carbonate species firmly bound to the surface OVs block the formation of the secondary oxidative species via H2O2 activation, assuring the dominant role of the in situ generated O2•– for the selective HOC dehalogenation. The carbonate-deactivated OVs of the nCuO can be feasibly recovered via air annealing for sustainable dehalogenation. This work provides a new opportunity for selective O2•– generation via interfacial defect engineering for dehalogenation and other environmental applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2024
·
IF 3.8
Fengjuan Miao,Honggang Wang,Xiaoqin Li,Bairui Tao,Hui Li
To develop materials that can meet the sensing and capacitive performance of glucose. Hydrothermal and electroplating procedures were used to prepare linear NiCo 2 O 4 and nano-CuO particles, respectively. The sensor's sensitivity was 1174.57 μA mM −1 cm −1 , with a low detection limit of 0.024 μM (S/N = 3), and its detection range was 0.3–12.6 mM, with good stability as verified using an electrochemical workstation. In addition, at a current density of 2 A g −1 , this material exhibits a specific capacitance of up to 2140.0F g −1 in supercapacitors. After 5000 cycles, its stability remained at 93.89 %. Similarly, asymmetric supercapacitor devices based on nickel foam exhibit A high specific capacitance of 605.5 F g −1 at a current density of 2 A g −1 . It is demonstrated that linear NiCo 2 O 4 modified with CuO nanoparticles can be employed not only as a sensitive material for glucose sensors but also for the production of supercapacitors.
研究领域:
材料科学
·
生物医学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yiping Su,Shun Li,Guimin Jiang,Zuquan Zheng,Chao Wang,Shiyin Zhao,Daling Cui,Yong Liu,Boping Zhang,Zuotai Zhang
Adsorption and photocatalytic oxidation are promising technologies for eliminating antibiotics (e.g. tetracycline) in aquatic environments. However, traditional powdery nanomaterials are limited by drawbacks of difficult separation and lack of synergistic function, which do not conform to the practical demand. Herein, we developed a simple one-step gelation-pyrolysis route to fabricate hydrophilic three-dimensional (3D) porous photocatalytic adsorbent, in which CuO nanoparticles are uniformly and firmly embedded in nitrogen-doped ( N -doped) porous carbon frameworks. The obtained N -doped carbon/CuO bulky composites exhibited excellent ability to adsorb tetracycline hydrochloride (TC), which was subsequently photo-oxidized under visible light. Their hydrophilic nature favors the adsorption processes toward TC, with a maximum adsorption capacity reaching 25.03 mg∙g −1 . In addition, >94.4% of TC molecules could be photo-degraded in 4 h with good cycling efficiency after three consecutive tests. Finally, a reaction scheme for removal process of TC was proposed. The obtained 3D porous N -doped carbon/CuO nanocomposites show great promise for efficient removal of antibiotics in aqueous solution by synergistically utilizing adsorption and photocatalytic oxidation processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingyi Nie,Jianfei Liao,Tintin Jiao,Binron Sun,Meiyun Zhang,Ruiting Yang,Yueqing Li
The health impacts of air pollution such as particulate matter (PM) and bioaerosols have prompted a focus on the utilization of personal protective filters. Traditional filters pose environmental concerns due to their non-biodegradable composition, while cellulose presents a promising alternative for biodegradable air filtration applications. This research involved the development of cellulose filter substrates with a customizable pore structure by adjusting the nanofiber content in cellulose filters and employing a simultaneous freeze-drying method. By integrating chitosan and CuO nanoparticles, the filters gained electrostatic adsorption capabilities, leading to a substantial enhancement in filtration efficiency, as well as imparting moisture resistance and durable antimicrobial properties to the filter. Subsequently, a three-layer cellulose filter integrated with chitosan and CuO (abbreviated as Int-Cs&CuO) was constructed based on the generalized Murray’s law to enable multi-stage PM filtration. The Int-Cs&CuO cellulose filter demonstrated filtration efficiencies of 99.2 % for non-oily PM 0.3 and 99.5 % for oily PM 0.3 , with a low pressure drop of 49.5 Pa. Under humid conditions, the filtration efficiency of the Int-Cs&CuO cellulose filter against PM 0.3 particles was minimally impacted, showcasing a decrease of only 1.3 %. Notably, the filter exhibited complete biodegradation in composted soil within approximately 2 months.
研究领域:
环境科学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2014
·Vol. 21
·期 1
·185-190
·
IF 1.836
Fan Yang,Liu Pei-Fang,Yang Zi-Juan
C/CuO nanocomposites were prepared by hydrothermal treatment of copper nitrate with starch, followed by H 2 O 2 oxidation and calcination. Structure characterizations show that high crystalline CuO nanoparticles with average size of ca. 40 nm are monodispersed on carbon microspheres. When used as electrode material for supercapacitors, the C/CuO nanocomposite exhibits high specific capacitance of 205 F g −1 at a current density of 1 A g −1 and excellent rate capacity (78 % capacitance was retained when the current density increased from 0.5 to 10 A g −1 ). It also shows good cycling stability with capacitance retention of 91 % after 1,000 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Dongmei Han,Bachirou Guene Lougou,Yong Shuai,Wei Wang,Boshu Jiang,Enkhbayar Shagdar
As heat storage and heat transfer medium , molten salt plays a vital role in achieving high heat transfer efficiency in concentrating solar power (CSP) plants. In this study, ternary chloride salts (NaCl–KCl–MgCl 2 ) is considered as the base salt and the nanocomposites doped with different mass fractions of CuO are synthesized using the solution evaporation method. The thermophysical properties of the nanocomposites, including melting temperature, phase change enthalpy , specific heat, thermal diffusivity , and thermal conductivity are investigated. The experimental results indicated the melting temperature of the nanocomposites is very close to that of the base salt. The specific heat of the nanocomposite in the liquid phase region is 10.51% higher than that of the base salt when the mass fraction of CuO was 0.7%. The addition of CuO nanoparticles significantly increase the thermal diffusivity and thermal conductivity of the base salt. The thermal diffusivity and thermal conductivity of the nanocomposites are increased by 10.95–37.23% and 15.85–39.55% compared to the base salt, respectively. The nanocomposites doped with CuO nanoparticles exhibit good application prospects and excellent thermal energy storage performance for high-temperature CSP systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·520-526
·
IF 3.201
Linxu Xu,Jiajia Zhang,Zhenhui Li,Qinghai Ma,Yan Wang,Fang Cui,Tieyu Cui
CuO nanoparticles (CuO NPs) with ultrasmall size (∼3.6 nm) and a highly-dispersed pattern embedded in a silica matrix were obtained in situ through a calcination process of organic copper salt. By means of rational selection of reactants, organic copper salt was introduced into Si–O–Si networks via covalent bonding during the sol–gel process under neutral conditions without any additional catalyst. The introduction of organic copper salt via covalent bonding as well as the compact Si–O–Si networks allowed for the formation of highly dispersed and ultrasmall sized CuO NPs. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the obtained silica complex had spherical morphology and well-dispersed small sized CuO NPs. The as-obtained CuO@SiO2 nanocomposites exhibited good catalytic property on the reduction of organic dye with NaBH4 as the reducing agent.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuan Zhang,Dong Wang,Gaili Liu,Kun Wang,Shaomin Shuang,Chuan Dong
2-Mercaptobenzothiazole (MBT), commonly employed in the rubber and metal industries, poses a significant environmental hazard, detrimental effects on aquatic ecosystems and potential carcinogenicity in humans. Urgent measures are warranted to develop practical strategies for MBT analysis and mitigation. This study introduces a novel nanozyme sensor, orderly consistent with dendritic mesoporous silica nanoparticle (DMSN), CuO nanoparticle cargo, and MnO 2 shell (designated as DMC), engineered for both MBT detection and degradation. By harnessing oxidase-like MnO 2 and peroxidase-like CuO mediated singlet oxygen ( 1 O 2 ), superoxide anion radicals (O 2 •- ), and hydroxyl radicals (•OH) generation, combining with the MBT-triggered colorimetric change of 3,3′,5,5′-tetramethylbenzidine (TMB), the absorbance and colorimetric methods with a broad linear detection range spanning 0.25 to 30 μM and 122 nM limit of detection are established. Furthermore, leveraging the evident ROS production by the nanozymes, DMC exhibits the advanced capability to modulate MBT levels and notably mitigate its biotoxicity oxidatively due to the ultrahigh reactive •OH from CuO nanoparticle compare with the MnO 2 . This research presents a facile and cost-effective approach for MBT detection while contributing positively to MBT management and environmental preservation efforts.
研究领域:
环境科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haoru Shan,Wenqiang Wang,Zhirong Wang,Jianlong Ge,Qixia Liu,Wei Zhang,Qiuxia Fu
Constructing CuO-based nanofibrous membranes with remarkable mechanical performance, controllable nanostructures, and outstanding catalytic oxidation activity would be conducive to decomposing organic contaminants in wastewater through advanced oxidation processes; however, there remains a huge shortfall of such ceramic membranes that they are usually fragile with poor deformability. Herein, a universal approach was proposed for fabricating flexible CuO nanoparticles-anchored ZrO 2 nanofibrous membranes (CZNMs), that is, through the combination of successive ionic layer adsorption and reaction (SILAR) assembly and the follow-up thermal oxidation processes. Notably, the developed preparation method exhibited strong expansibility, which could be extended to the synthesis of other flexible metal oxides/ceramic nanofibrous composites, such as ZnO/ZrO 2 , CdO/ZrO 2 , and Mn 3 O 4 /ZrO 2 . Profiting from the integrated advantages of superior catalytic reactivity, uniform nanostructures distribution, and excellent mechanical properties, the resultant CZNMs displayed a prominent degradation efficiency of 92.4% within 50 min towards tetracycline hydrochloride under the activation of peroxymonosulfate (PMS). Furthermore, the stable hierarchical structures and robust mechanical performance endow the as-synthesized membranes with extraordinary reusability and easy recycling. The successful preparation of such ceramic-based nanofibrous membranes with superior flexibility and high-efficient catalytic performance might provide some reference to develop other synergetic membranous catalysts for wastewater treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2023
·
IF 7.3
Tao Li,Yuhua Li,Peiyan Qin,Gehong Wei,Chun Chen
Phytophthora sojae is an oomycete pathogen that causes significant agricultural losses worldwide, mainly the soybean damping-off and root/stem rot. To counter this, copper oxide nanoparticles (CuO NPs)/reduced graphene oxide (rGO) composites (CuO-rGO) have been proposed as a potential solution in nano-agriculture. In this study, we aimed to investigate the inhibitory mechanisms of CuO-rGO, CuO NPs, and CuCl2 on P. sojae through phenotypic and transcriptomic analysis. Even a low concentration of 10 mg Cu2+ L−1, CuO-rGO, CuO NPs, and CuCl2 exhibited remarkable inhibitory effects on the pathogen. This was due to the capacity of these three forms of Cu to induce oxidative stress, which caused disruptions in the mycelial cell membrane, intracellular structure, carbon metabolism, organic acid metabolic processes, and amino acid metabolism. Among them, CuO-rGO showed a better slow-release effect and long-lasting antimicrobial properties, making it more suitable for practical agricultural use. Furthermore, the transcriptomic analysis revealed distinct patterns of antioxidant enzyme-related genes among treatments. Compared to the other two treatments, the CuO-rGO treatment showed higher expression of differential expression genes (DEGs) associated with superoxide dismutase (SOD) and peroxiredoxin (PRDX). The CuO NPs treatment had the most significant expression of DEGs related to catalase (CAT), while the DEGs linked to glutathione peroxidase (GPX) were significantly expressed in the CuCl2 and CuO-rGO treatments. These findings suggest that CuO-rGO has great potential as a practical agricultural agent against oomycete pathogens. Further investigations are essential to elucidate the mechanisms underlying the oxidative stress and antioxidant systems induced by different copper forms in the future.
研究领域:
农业
·
微生物学
·
纳米技术
·
植物病理学
✓ 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）