JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Jianbo Liu,Yonghui Shang,Jinqiong Xu,Yi Chen,Yarong Jia,Jianbin Zheng
Carcinoembryonic antigen (CEA) is a typical biomarker for lung cancer. It is very urgent to develop a sensitive and rapid method to assay CEA content in human serum. In this work, Cu-MOFs nanomaterials were synthesized by a hydrothermal method . Toluidine blue (TB) loaded mesoporous Cu-MOFs with polydopamine (PDA) coating were employed as a signal probe. The proposed sandwich immunosensor was fabricated by Cu-MOFs-TB/PDA, chitosan and MWCNTs on the glassy carbon electrode with a large surface area to immobilize primary antibodies (Ab 1 ) and provide excellent conductivity. The sensitivity improvement of this new strategy was based on the destruction of the probe and the immune complex by HCl, which resulted in the closer distance between TB and the sensing electrode. Under optimal conditions, CEA was quantitatively detected with a wide linear range from 20 fg mL −1 to 200 ng mL −1 , a low detection limit of 3.0 fg mL −1 (S/N = 3). In addition, the method showed good stability, selectivity, and reproducibility, which possessed wide potential applications for the detection of other tumour biomarkers.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9057-9064
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IF 2.22
Zhao Jingkui,Liu Xiansong,Kan Xucai,Chen Zuhua,Liu Chaocheng,Wang Wei,Lv Qingrong,Huang Jingwen,Shazeda Mudssir
In this study, novel Ni–Cu–Zn ferrites with the chemical formula [Ni 0.6 Zn 0.4 ][Cu 0.2 Co x Fe 1.8− x ]O 4 ( x = 0, 0.05, 0.10, 0.15, 0.20, 0.25) doped with Co 2+ ions were designed and manufactured by standard solid-state reaction method. The magnetic properties, surface characteristics, and ion occupancy of ferrites were studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), and we explained the different mechanisms of the results and the relationship between magnetic properties and microstructures. For the obtained samples, cobalt ions entered the lattice, and all samples were characterized as spinel structures. As the doping amount of Co 2+ ions increases, the lattice constant and volume of the sample also increases. With an appropriate doping level, Co 2+ ions-doped Ni–Cu–Zn ferrites can maintain higher saturation magnetization, higher magnetic permeability, and lower hysteresis loss. When x ≤ 0.1, the saturation magnetization M s increases significantly as the doping amount of Co 2+ ions increases, but when x > 0.1, the value decreases. The experimental results show that the saturation magnetization value is 118.08 emu/g, the magnetic permeability value is 39.47 H/m, and the hysteresis loss is 1.192 mW/cm 3 at an optimum doping amount. Therefore, the sample achieves the best magnetic properties when the doping amount is 0.1.
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APPLIED CATALYSIS A-GENERAL
·
2020
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IF 5.006
Yubing Hu,Yan Wang,Yulian Wang,Wei Li,Jinli Zhang,You Han
In order to develop a cut-price, high-efficiency non-mercuric catalyst for acetylene hydrochlorination reaction, several kinds of supported Cu-based catalysts containing phosphoramide ligands have been synthesized by wet impregnation method. The outstanding catalytic activity was obtained over 15 %Cu10 %HMPA/SAC catalyst with acetylene conversion of 87.25 % in the test conditions of T =180 °C, GHSV (C 2 H 2 ) =180 h −1 and V (HCl): V (C 2 H 2 ) = 1.2. The catalyst with optimal HMPA ligand also exhibited splendid stability in 100 h lifetime test. The analysis for XRD, TEM, TGA, ICP, H 2 -TPR and XPS indicated that HMPA ligand can improve Cu species dispersion, restrain coke deposition, suppress loss of loading Cu, and stabilize valence state of active Cu species. Due to electron transfer mechanism, steady coordination structure between Cu and HMPA led to favorable properties of Cu-based catalyst, which was further proved by FT-IR, Raman spectra, O 1s XPS spectra integrated with DFT calculations.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Peng Gu,Qi Li,Weizhen Zhang,Zheng Zheng,Xingzhang Luo
Eastern China is a typical region that suffers from harmful cyanobacterial blooms. Numerous studies have focused on bloom formation mechanisms; however, the detailed mechanisms remained unclear. Our study explored the influence of four metal ions (Ca, Cu, Pb and Cd) on Microcystis aeruginosa to determine their effects on bloom formation. We found that Ca concentrations higher than 100 mg L −1 contributed to cyanobacterial bloom formation. The presence of Ca triggered the anti-oxidation process and promoted the secretion of extracellular polysaccharides , thus inducing aggregation of algal cells and enhancing their buoyancy 2.1-fold more than the control ( p ＜0.05). The reverse regulation of dissolved CO 2 to bicarbonate by carbonic anhydrase formed a large amount of carbonate and decreased the growth rate by 38–56%. Cu (>0.1 mg L −1 ) presented significant toxicity to algal cells while Pb (>1 mg L −1 ) suppressed the algal growth rate due to the acidic condition. Cd (<0.1 mg L −1 ) exhibited no apparent toxicity to the algae. Furthermore, as the buoyancy increased, Cd was likely to facilitate the formation of cyanobacterial blooms, which needs further research. These findings can provide a theoretical basis for eutrophic lake management and contribute to the development of water quality and wastewater discharge standards.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Jinhong Ye,Dongmei Deng,Yanqin Wang,Liqiang Luo,Kunpeng Qian,Shaomei Cao,Xin Feng
Unique and well-aligned Cu@C core-shell nanocubes were rationally designed for nonenzymatic glucose detection using cubic Cu 2 O nanoparticles immerged in water-soluble polyvinyl pyrrolidone (PVP) coatings as precursor. As a consequence, the optimum Cu@C nanocubes with a shell thickness of ∼6.48 nm were prepared by the initial coating of Cu 2 O nanoparticles with 1.5 mg/mL PVP and subsequent annealing at 600 °C. After thermal annealing process, Cu 2 O nanoparticles were reduced to Cu nanocubes; at the same time, PVP was pyrolyzed to carbon shell encapulating the cubic Cu core. Due to efficient protection of the carbon shell of Cu core from oxidization and the advantageous inter-connected core-shell conductive networks, the hierarchical Cu@C nanocubes exhibit excellent electrocatalytic activity towards glucose oxidation. Under optimum condition, the resulted 600 °C annealed 1.5 mg/mL-Cu@C/Nafion modified glassy carbon electrode displayed high efficient nonenzymatic glucose detection, offering a wide linear range of 40 μM – 40 mM, with low detection limit at 21.35 μM (S/N = 3) and high sensitivity peak of 2565 μA mM –1 cm –2 . More importantly, the well-designed Cu@C core-shell nanocubes could be utilized as a promising nonenzymatic sensor in practical biological applications for the detection of glucose concentration in human serum samples.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Jing Huang,Jiawei Dai,Jiannan Zhu,Rong Chen,Xiaoqi Fu,Hongfang Liu,Guangfang Li
Electrocatalytic reduction of CO 2 (CO 2 RR) represents a promising approach to reduce CO 2 emission and generate value-added chemicals. Herein, we developed bimetallic Au-Cu gradient alloy nanostructures (AuCu-g) comprising of ultrathin Cu-rich alloy surface and Au-rich alloy core as electrocatalyst via a facial solvothermal method. Impressively, the AuCu-g can stably generate a considerable amount of C 2 H 4 with faradaic efficiency (FE) ∼20 % at a low limiting potential of −0.4 V versus reversible hydrogen electrode (RHE) due to its unique gradient structure and multi-component tandem effect. The potential-dependent in situ Raman spectrum indicated an enhanced *CO adsorption strength and a remarkable CO intermediate generation over Au-Cu gradient alloy at low overpotentials during CO 2 reduction process. This work shines a light for developing mutilmetallics toward efficient CO 2 RR.
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Nanomaterials
·
2022
·Vol. 12
·期 21
·3844
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IF 5.719
Zhenlan Xu,Qing Tang,Aimei Hong,Lingxiangyu Li
Along with the development of nanotechnology, nanomaterials have been gradually applied to agriculture in recent years, such as Cu(OH)2-nanorods-based nanopesticide, an antibacterial agrochemical with a high efficacy. Nevertheless, knowledge about physical stability of Cu(OH)2nanopesticide in soil solutions is currently scarce, restricting comprehensive understanding of the fate and risk of Cu(OH)2nanopesticide in the soil environment. Herein we investigated aggregation, sedimentation and dissolution of Cu(OH)2nanopesticide in soil solutions extracted from three different soil samples, wherein commercial Cu(OH)2nanopesticide formulation (NPF), as well as its active ingredient (AI) and laboratory-prepared Cu(OH)2nanorods (NR) with similar morphology as AI, were used as model Cu(OH)2nanopesticides. We found that NPF compared to AI showed less extents of aggregation in ultrapure water due to the presence of dispersing agent in NPF. Yet, moderated aggregation and sedimentation were observed for Cu(OH)2nanopesticide irrespective of NPF, AI or NR when soil solutions were used instead of ultrapure water. The sedimentation rate constants of AI and NPF were 0.023 min−1and 0.010 min−1in the ultrapure water, whereas the rate constants of 0.003–0.021 min−1and 0.002–0.007 min−1were observed for AI and NPF in soil solutions, respectively. Besides aggregation and sedimentation, dissolution of Cu(OH)2nanopesticide in soil solutions was highly dependent on soil type, wherein pH and organic matter played important roles in dissolution. Although the final concentrations of dissolved copper (1.08–1.37 mg/L) were comparable among different soil solutions incubating 48 mg/L of AI, NPF or NR for 96 h, a gradual increase followed by an equilibrium was only observed in the soil solution from acidic soil (pH 5.16) with the low content of organic matter (1.20 g/kg). This work would shed light on the fate of Cu(OH)2nanopesticide in the soil environment, which is necessary for risk assessment of the nanomaterials-based agrochemical.Keywords:soil solutions;aggregation;sedimentation;Cu(OH)2nanopesticide;dissolution
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ELECTROCHIMICA ACTA
·
2026
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IF 5.8
Hancong Du,Jiarui Li,Fengling Tian,Wenli Zhu,Kaxi Chen,Mengxia Li,Shan Liao,Yali Yuan,Jinfang Nie,Yun Zhang
A point-of-care sensor was initially reported for portable detection of Cu 2+ ions. • It was based on the Cu 2+ -accelerated growth of gold nanoparticles. • These nanoparticles could enhance the conductivity of screen-printed electrodes. • Only a hand-held electrochemical reader was required to achieve a detection limit down to ∼1.6 nM. This paper initially reports an electrochemical method for point-of-care sensing of divalent copper (Cu 2+ ) ions by combining screen-printed electrodes (SPEs) with a hand-held current reader. In the buffer of 4-morpholineethanesulfonic acid, chloroauric acid can be slowly reduced into gold nanoparticles (GNPs). In the presence of Cu 2+ , the analyte is able to significantly promote the growth process of GNPs. These GNPs generated in the reaction solution then act as efficient electronic nanoconductors to greatly enhance the SPE’s conductivity leading to an enhanced current response. The enhancement degree of this current signal is positively proportional to Cu 2+ concentration in the sample. The results indicate that this new electrochemical method only requires disposable SPEs without functional modification and a user-friendly, portable current reader to linearly detect Cu 2+ in a concentration range of 24.41 - 6250 nM. Its detection limit is estimated to be about 1.6 nM (3σ rule), which is far lower than the maximum allowable concentrations in drinking water stipulated by the World Health Organization (∼30 µM) and the National Health Commission of China (∼15 µM). The acceptable recovery of Cu 2+ in several real water samples (i.e., drinking water, tap water and pond water) is between 98.03 and 106.95%. Download: Download high-res image (118KB) Download: Download full-size image
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LANGMUIR
·
2023
·
IF 3.9
Wen Chen,Zhiwei Huang,Jiangwei Ni,Qiqi Zhou,Xiaomin Wu,Huazhen Shen,Huawang Zhao,Guohua Jing
Volatile organic compounds such as benzene are hazardous air pollutants that require effective elimination. Noble metal-based catalysts exhibit high benzene combustion activity, but their prohibitive cost necessitates strategies to enhance utilization efficiency. This study investigates a Pt–Cu alloy catalyst for improved benzene combustion by preferentially exposing Pt active sites through Cu alloying. Aberration-corrected scanning transmission electron microscopy and X-ray spectroscopy characterize the nanoscale distribution and enrichment of Pt on the alloy surface. Kinetic measurements demonstrate substantially enhanced activity compared with Pt catalysts, attributed to increased Pt metallic site exposure rather than alteration of the reaction mechanism. In situ Fourier transform infrared (FTIR) spectroscopy reveals a higher abundance of terrace-like Pt sites in the alloy, beneficial for benzene adsorption. Partial pressure dependence analyses indicate competitive adsorption of benzene and O2, following Langmuir–Hinshelwood kinetics. These findings provide conceptual insights into tuning surface composition in bimetallic catalysts to optimize noble metal efficiency, with broad applicability for sustainable catalytic process advancement.
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Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300809
·
IF 11
Xiankun Zheng,Lijin Wang,Jialin Bai,Han Zhang,Hanzhuang Zhang,Aiwei Tang,Wenyu Ji
Currently, the performance of quantum-dot light-emitting diodes (QLEDs) based on environmental-friendly Cu─In─Zn─S quantum dots (QDs) still lags far behind that of Cd-QDs-based devices. Here it is demonstrated that the unique trap-related recombination in Cu─In─Zn─S QDs is mainly responsible for the low device efficiency. The luminous efficiency of Cu─In─Zn─S-based QLEDs is rather sensitive to the temperature and hole-transporting layers (HTLs) due to the susceptible thermal-related trappingdetrapping processes of holes in radiative Cu-related traps. The holes in Cu-related traps can be quenched by escaping to the valence band of the QDs or/and transferring to the adjacent HTLs. An HTL with low highest occupied molecular orbitals is desired to enhance the hole injection and hinder the aforementioned hole transfer. As a result, a high device efficiency of 6.0 cd A −1 is achieved at room temperature, which is attributed to suppressed HTL-induced emission quenching and efficient valence-band-dominated hole injection from HTL to the QDs. The device efficiency is further increased to 13.2 cd A −1 at 150K by suppressing thermal-induced quenching.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2023
·Vol. 24
·期 19
·14859
·
IF 5.6
Yan Xiao,Jie Li,Yuan Tan,Xingkun Chen,Fenghua Bai,Wenhao Luo,Yunjie Ding
Catalytic conversion of biomass-derived ethanol into n-butanol through Guerbet coupling reaction has become one of the key reactions in biomass valorization, thus attracting significant attention recently. Herein, a series of supported Cu catalysts derived from Ni-based hydrotalcite (HT) were prepared and performed in the continuous catalytic conversion of ethanol into butanol. Among the prepared catalysts, Cu/NiAlOxshows the best performance in terms of butanol selectivity and catalyst stability, with a sustained ethanol conversion of ~35% and butanol selectivity of 25% in a time-on-stream (TOS) of 110 h at 280 °C. While for the Cu/NiFeOxand Cu/NiCoOx, obvious catalyst deactivation and/or low butanol selectivity were obtained. Extensive characterization studies of the fresh and spent catalysts, i.e., X-ray diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Hydrogen temperature-programmed reduction (H2-TPR), reveal that the catalysts’ deactivation is mainly caused by the support deconstruction during catalysis, which is highly dependent on the reducibility. Additionally, an appropriate acid–base property is pivotal for enhancing the product selectivity, which is beneficial for the key process of aldol-condensation to produce butanol.Keywords:Ni-based hydrotalcite;biomass conversion;support effect;selectivity;stability
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RSC Advances
·
2023
·Vol. 13
·期 38
·26324-26329
·
IF 3.9
Shuhua Cao,Anlin Wang,Kaoxue Li,Zhiteng Lin,Hongwei Yang,Xiaolei Zhang,Jianmei Qiu,Xishi Tai
A novel tetranuclear Cu(II) complex (TNC) was successfully synthesized and characterized by X-ray single crystal diffraction. The interaction of the complex with calf thymus DNA (CT-DNA) has been studied by UV-vis absorption titration, fluorescence technology and molecular docking. The results indicated that TNC could bind to the DNA through an intercalative mode. The agarose gel electrophoresis experiment showed that TNC could cleave supercoiled plasmid DNA into linear DNA. The anticancer activity of TNC was tested on four cancer cell lines: MCF7, A549, 4T1 and HepG2. The results indicated that TNC shown significant activity against all of above cell lines.
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