Materials
·
2024
·Vol. 17
·期 8
·1849
·
IF 3.1
Zhongmin Wang,Xiaoyu Zhou,Yongwei Shang,Bingkui Wang,Kecheng Lu,Weijiang Gan,Huajun Lai,Jiang Wang,Caimin Huang,Zongning Chen,Chenggang Hao,Enlang Feng,Jiacheng Li
The exceptional corrosion resistance and combined physical and chemical self-cleaning capabilities of superhydrophobic photocatalytic coatings have sparked significant interest among researchers. In this paper, we propose an economical and eco-friendly superhydrophobic epoxy resin coating that incorporates SiO2@CuO/HDTMS nanoparticles modified with Hexadecyltrimethoxysilane (HDTMS). The application of superhydrophobic coatings effectively reduces the contact area between the metal surface and corrosive media, leading to a decreased corrosion rate. Additionally, the incorporation of nanomaterials, exemplified by SiO2@CuO core–shell nanoparticles, improves the adhesion and durability of the coatings on aluminum alloy substrates. Experimental data from Tafel curve analysis and electrochemical impedance spectroscopy (EIS) confirm the superior corrosion resistance of the superhydrophobic modified aluminum alloy surface compared to untreated surfaces. Estimations indicate a significant reduction in corrosion rate after superhydrophobic treatment. Furthermore, an optical absorption spectra analysis of the core–shell nanoparticles demonstrates their suitability for photocatalytic applications, showcasing their potential contribution to enhancing the overall performance of the coated surfaces. This research underscores the promising approach of combining superhydrophobic properties with photocatalytic capabilities to develop advanced surface modification techniques for enhanced corrosion resistance and functional properties in diverse industrial settings.
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PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Basiru O. Yusuf,Sulayman A. Oladepo,Saheed A. Ganiyu,Abdul Malik P. Peedikakkal
Metal-organic frameworks (MOFs) are excellent for immobilizing guest active species due to their high surface area and porosity. In this study, CuO/UiO-66 catalysts with varying amounts of CuO were successfully synthesized and used for converting waste cooking oil (WCO) to biodiesel. The catalysts were characterized using N 2 adsorption-desorption, XRD, NH 3 -TPD, SEM, TEM, TGA and FTIR. The biodiesel was characterized using NMR and GC–MS. The results showed that CuO/UiO-66 displayed high catalytic activity due to the synergistic effect between UiO-66 and copper oxide in the composite. Under optimum reaction conditions, we achieved a 90.1 % conversion with the 7 %CuO/UiO-66 catalyst. This catalyst also displayed good stability and reusability with a conversion of 81.06 % after three cycles. Our kinetic studies revealed a pseudo-first-order kinetics, with 32.26 kJ/mol in activation energy, consistent with a chemically controlled reaction.
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CHEMOSPHERE
·
2018
·
IF 4.427
Yuanxia Luo,Baoyu Gao,Qinyan Yue,Ruihua Li
Humic acid (HA) influences the aggregation and stability of nanoparticles (NPs), which determine the removal performance of NPs in coagulation. Consequently, in this study, the impact of HA concentration on the simultaneous removal of CuO NPs, Cu 2+ , and natural organic matter (NOM) was investigated. Enteromorpha polysaccharides (Ep), as the novel recycling coagulant aid, were integrated with polyaluminum chloride (PAC) to treat composite contaminants in this coagulation process. Removal performance, floc properties, zeta potential , scanning electron microscope (SEM) images, and Fourier Transform Infrared Spectra (FT-IR) were measured and analyzed. Results showed that PAC with Ep (PAC-Ep) was more beneficial for improving removal performances than PAC alone. Further, the coagulation performance became better with the increase in HA concentration. When the HA concentration was 10 mg/L (used PAC-Ep), the removal efficiencies of CuO NPs and Cu 2+ were both more than 80%; and in particular, the highest removal efficiency of turbidity was 98%. However, excessive HA (more than 10 mg/L) reduced the removal efficiency of Cu by more than 31%. Smaller and denser flocs with better recoverability were formed as the HA concentration increased. Furthermore, because of affluent functional groups, HA was easily adsorbed on the surface of NPs and combined with dissociative Cu 2+ , thereby forming a composite contaminant. During the coagulation process, the colloidal system was destabilized preferentially by the charge neutralization between composite contaminants and PAC. Furthermore, a chelated reticular structure was formed by the conjunction of carboxyl and hydroxyl groups (from Ep) and Al (III) species (from PAC). Flocs were further enlarged and precipitated by bridging and sweeping of this structure.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shi-Yuan Zhang,Hong-Lin Zhu,Yue-Qing Zheng
Transition metal oxides with hierarchical structures that grow on conductive substrates directly, which have been considered as promising catalysts for electrochemical catalysis. In this study, we used a stepwise synthesis method to prepare CuO nanoflake @Co 3 O 4 nanowire composite nano-arrays (denote as CuO/Co 3 O 4 composite), which show an excellent electrochemical performance. In the oxygen evolution reaction (OER), the CuO/Co 3 O 4 composite shows lower overpotential of 450 mV at the current density of 50 mA cm −2 and a smaller Tafel slope of 42 mV dec −1 in KOH solution (1 M, pH = 13.7). In the electrocatalytic CO 2 reduction reaction, the prepared CuO/Co 3 O 4 composite showed better CO selectivity in KHCO 3 aqueous solution (0.1 M, CO 2 saturated), the corresponding Faradaic efficiency of CO product reached 35.4%, and the product ratio of H 2 to CO was controlled by changing the potential values. The synthesis strategy reported here opens a way for designing high-performance electrodes for electrochemical catalysis and also provides new ideas for the construction of overall reaction (CO 2 + H 2 O → CO + O 2 ).
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Jihai Duan,Pengxia Sun,Hui Zhao,Zhengnan Ji,Delu Zhang,Weiwen Wang
Nanostructure photocatalysts with unique and stable structure and high specific surface area are expected to be widely used in photocatalytic CO 2 reduction. In this paper, columnar cactus-like Cd x Cu 1-x S/CuO/CM composite catalyst was prepared by a simple method combining thermal oxidation with a successive ionic layer adsorption and reaction (SILAR) technique. The combination of Cd x Cu 1-x S nanosheets and CuO nanowires can significantly improve the specific surface area, capacity of light capture and absorption and separation of electrons and holes inside which were beneficial for efficiency of photocatalysis . Their complementary conduction band and valence band positions synergistically form p-n heterojunctions , achieving the effect of multi-level charge separation. The 2D/1D Cd x Cu 1-x S/CuO/CM have better photocatalytic activity than pure CuO nanowires in the production of methanol by using solar energy to reduce CO 2 . After 4 h of irradiation, the methanol yield of 2D/1D Cd x Cu 1-x S/CuO/CM reached 3.60 μmol g −1 cat, which was 2.81 times the yield of pure CuO/CM. This work has certain significance for the development of new energy and environmental protection.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Ningyan Cheng,Yurui Xue,Qian Liu,Jingqi Tian,Lixue Zhang,Abdullah M. Asiri,Xuping Sun
In this paper, we develop a novel strategy toward the in-situ growth of core/shell nanorods array consisting of Cu(OH) 2 -CuO nanosheets as the shell and Cu as the core on Cu foil [Cu/(Cu(OH) 2 -CuO) NA/CF]. As an integrated 3D non-noble-metal oxygen evolution anode, the Cu/(Cu(OH) 2 -CuO) NA/CF shows high catalytic activity with an onset overpotential of 350 mV and a Tafel slope of 76 mV/dec. It needs an overpotential of 417 mV to drive current density of 10 mA/cm 2 and maintains its catalytic activity for at least 22 h. The attractive performances make it promising candidate as a future high-performance catalyst for applications.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Yue Zhang,Jinli Li,Yaya Jia,Linzhe Wang,Kang Wu,Shan Liu,Bing Liu
Solar salt (SS), serving as both a thermal energy storage (TES) material and heat transfer fluid (HTF), plays a critical role in determining the overall efficiency of concentrating solar power (CSP) plants through its thermophysical properties. Thus, a high-temperature static melting method and ultrasonic aqueous solution method was used to prepare nano CuO-SS nanocomposites for investigating the thermal properties improvement of SS by two different particle sizes of nano CuO (40 nm and 100 nm). The liquid specific heat capacity (c p ) appeared a trend of first increasing and then decreasing with the addition of nano CuO. It was 1.99 J/(g·K) and 1.81 J/(g·K) when the two nano CuO content was both 1.5 wt% in two system, and there was an increase of 28.39 % (nanocomposite CuO1-SS-4 of CuO1-SS system, Cu1SS-4) and 16.77 % (nanocomposite of CuO2-SS system, Cu2SS-4) compared with the pure SS respectively. The nanocomposites Cu1SS-4/Cu2SS-4 maintained excellent thermal stability, showing no change in their working temperature range compared to pure SS. The uniform dispersion of nano CuO particles was confirmed through scanning electron microscopy (SEM) characterization. The superior heat storage capacity results from the greater surface area and higher surface energy of smaller nano CuO, which facilitated more efficient thermal energy storage in the system. It had increasement of 47.25 % and 56.04 % about thermal conductivity of nanocomposite Cu1SS-4 and Cu2SS-4. The nitrate-based nanocomposite as a promising candidate material for thermal energy storage, due to its high heat storage, excellent chemical compatibility, large suitable working temperature and high thermal stability.
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Nanomaterials
·
2018
·Vol. 9
·期 1
·4
·
IF 3.504
Dehua Deng,Yuanqiang Hao,Jiajia Xue,Xiuhua Liu,Xinyue Xu,Lin Liu
A colorimetric immunoassay has been reported for prostate-specific antigen (PSA) detection with CuO nanoparticles (CuO NPs) as signal labels. The method is based on Cu2+-catalyzed oxidation of ascorbic acid (AA) by O2to depress the formation of colored gold nanoparticles (AuNPs). Specifically, HAuCl4can be reduced by AA to produce AuNPs in situ. In the presence of target, CuO NPs-labeled antibodies were captured via the sandwich-type immunoreaction. After dissolving CuO nanoparticles with acid, the released Cu2+catalyzed the oxidation of AA by O2, thus depressing the generation of AuNPs. To demonstrate the accuracy of the colorimetric assay, the released Cu2+was further determined by a fluorescence probe. The colorimetric immunoassay shows a linear relationship for PSA detection in the range of 0.1~10 ng/mL. The detection limit of 0.05 ng/mL is comparable to that obtained by other CuO NPs-based methods. The high throughput, simplicity, and sensitivity of the proposed colorimetric immunoassay exhibited good applicability for assays of serum samples.Keywords:colorimetric immunoassay;CuO nanoparticles;gold nanoparticles;ascorbic acid;fluorescence immunoassay
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shaojun Yuan,Chen Chen,Aikifa Raza,Ruixue Song,Tie-Jun Zhang,Simo O. Pehkonen,Bin Liang
Oil-contaminated water caused by either oil spill disasters or industrial disposal has posed a global risk to environmental sustainability and human health. To address the ever-growing need for highly efficient separation of oil/water mixtures, nanostructured TiO 2 /CuO dual coatings were fabricated on the copper mesh by a combination of electrochemical anodization and layer-by-layer self-assembly deposition to render its surface with superhydrophilic, underwater superoleophobic and self-cleaning functionality. Cu(OH) 2 nanoneedle arrays (NNA) were vertically grown from the copper mesh surfaces by electrochemical anodization processes, followed by the deposition of TiO 2 multilayer on the Cu(OH) 2 NNA via layer-by-layer assembly prior to being calcinated to form TiO 2 /CuO dual coatings. The nanostructured TiO 2 /CuO NNA dual-coated copper meshes were demonstrated to exhibit a high separation efficiency (oil residue content less than 20 ppm), excellent water flux (more than 80 kL·h −1 ·m −2 ), and desirable self-cleaning ability under ultraviolet (UV) illumination. The photo-catalytic ability of the deposited TiO 2 layers enabled the facile and rapid removal of the oil contaminants on the mesh surface under UV illumination to recover oil/water separation ability of the as-fabricated mesh for recycle use. With the adherent features of superhydrophilicity, underwater superoleophobicity and self-cleaning ability, the proposed TiO 2 /CuO NNA dual-coated meshes are potentially useful in practical oil/water separation applications.
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RSC Advances
·
2017
·Vol. 7
·期 75
·47435-47447
·
IF 3.108
Donglin He,Huiping Zhang,Ying Yan
CuO over ZSM-5 zeolite membrane was prepared by chemical vapor deposition (CVD) for catalytic wet peroxide oxidation (CWPO) of phenol in a fixed bed reactor. Firstly, Cu-ZSM-5/PSSFs catalysts with Cu loading of 2 wt%, 4 wt% and 6 wt% were prepared and characterized by XRD, XPS, SEM, EDS, N2 adsorption–desorption and TPR (H2), respectively. Compared with CuO deposited directly onto PSSFs, the CuO supported on ZSM-5/PSSFs tended to be more regular with smaller crystal size. Then, several parameters affecting H2O2 consumption and phenol oxidation such as reaction temperature, Cu loading, and different supports were investigated in the CWPO of phenol with a high concentration (1 g L−1 phenol and 5.1 g L−1 H2O2). Experimental results revealed that Cu-ZSM-5/PSSFs (6%) showed better activity for the oxidation of phenol than Cu-ZSM-5/PSSFs catalysts with lower Cu loading and CuO/PSSFs with same theoretical loading. A complete reduction of phenol and a high TOC removal around 60% had been achieved over Cu-ZSM-5/PSSFs (6%) at the temperature of 80 °C, feed flow rate of 2 mL min−1 and catalyst bed height of 2 cm. Finally, the possible oxidation pathway of phenol was studied based on the by-products detected by high-performance liquid chromatography (HPLC).
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Bin Yang,Jia Liu,Xin Liu,Shiyue Niu,Liqian Niu,Xian Wang,Xinxin Liu,Shuyun Bi
Acetamiprid and pymetrozine are effective pyridine insecticides used to kill aphids and whiteflies in agricultural products such as fruits, vegetables and rice, whose residues pose a serious threat to human health. Herein, the silver nanoparticles (AgNPs) modified by β -cyclodextrin ( β -CD) and nano-CuO (named as β -CD/CuO@AgNPs) were synthesized and it was used as surface-enhanced Raman spectroscopy (SERS) substrate to determine acetamiprid and pymetrozine. Among four SERS substrates such as AgNPs, β -CD/AgNPs, CuO@AgNPs and β -CD/CuO@AgNPs, β -CD/CuO@AgNPs exhibited the most substantial enhancement of the Raman signals for acetamiprid and pymetrozine, with the enhancement factors (EFs) of 2.16 × 10 6 and 3.86 × 10 6 , respectively. The XRD, TGA, TEM, HAADF-STEM, UV–vis and FT-IR were used to characterize β -CD/CuO@AgNPs and the combination of the substrate with acetamiprid/pymetrozine. Single factor experiment and response surface method were used to optimize pH, dosage of coagulant and nanosubstrate and mixing time. The influences of various interfering substances on the detection system were studied. The excellent linear relationships were respectively established for acetamiprid and pymetrozine in the range of 6.67 × 10 −9 –6.67 × 10 −7 and 1.00 × 10 −8 –1.00 × 10 −6 mol L −1 , with the limits of detection (LODs) were 0.36 and 0.94 nmol L −1 (S/N = 3). This project was successfully used for the detection of acetamiprid and pymetrozine in apple, pear and peach samples. The recoveries in the fruit samples were in the range of 95.5 %–105.0 %.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Junkai Hao,Jing Feng,Shuo Sun,Zhongxiang Cao,Wenjing Xu,Lei Hu,Wenli Yao,Zhengquan Yan
To reliably monitor dopamine (DA), a common neurotransmitter, a kind of nano CeO 2 /CuO modified carboxylated chitosan nanozyme (CeO 2 /CuO@CC) was constructed under microwave-assisted conditions. The proposed CeO 2 /CuO@CC exhibited superior synergistic- enhancement oxidase-like activity, with high specific surface area and superior stability. It could accelerate the oxidization of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxTMB in the air. What’s more, the presence of trace DA could exclusively change the enzyme-like activity of CeO 2 /CuO@CC, accompanied with visual color changes from blue to colorless. Under the optimized conditions, there expressed double ratiometric linear relationships between lg( A 652 / A 285 )/lg( A 370/ A 285 ) and c DA , with a large linear range between 6.0 × 10 −9 and 1.0 × 10 −5 M of DA. When applied for visual detection of DA in real samples, the detection limit was low to 2.0 × 10 −9 M with RSD % less than 4.14 %. The mechanisms for enhanced oxidase-mimic activity of CeO 2 /CuO@CC and its selective detection of DA were proposed. This work will offer an insight to design efficient nanozyme for visual detection of bio-analytes in practice.
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危险品化学品经营许可证（带存储）