SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Dehua Deng,Lin Liu,Yingping Bu,Xiuhua Liu,Xuezhen Wang,Bing Zhang
This work demonstrated that electrochemical sensing devices can be fabricated by electrocatalytic water oxidation. First, we suggested that the Cu(II) complexes with amino terminal Cu(II)- and Ni(II)-binding (ATCUN) peptides showed good electrocatalytic ability toward water oxidation. In contrast to the previously reported electrocatalysts for water oxidation, the ATCUN-Cu(II) electrocatalysts can operate at neural pH with lower oxidation potential. Furthermore, the ATCUN-Cu(II) metallopeptides can be easily modified onto the surface of nanomaterials to produce nanocatalysts for water oxidation. To demonstrate the analytical performances of the ATCUN-Cu(II) electrocatalysts as electrochemical signal labels, DNA analysis was performed in a sandwich option using gold nanoparticles (AuNPs) as the carriers. The method detected DNA down to 0.1 pM. This is the first time that H 2 O molecule was employed as the electrocatalytic substrate in electrochemical sensing devices.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jie Chen,Wenhao Xu,Xingjin Li,Libo Sun,Zihan Zhong,Zitao Zhang,Yun Tang
The optical properties of cost-effective Ag-Cu bimetallic nanocrystals, with synergistically enhanced catalytic and biological activities, are limited within ultraviolet–visible region due to lack of morphology control. In order to overcome this constraint, two-dimensional (2D) Ag-Cu bimetallic heterostructures were designed and synthesized by a seed-mediated colloidal growth method. The conformal Cu domain was epitaxially deposited on Ag nanoplates with different spatial configuration under retention of their 2D shape. Both of the 2D Ag-Cu core@shell and Janus structures display tunable localized surface plasmon resonance from visible to near infrared regions. The results of catalytic reduction of 4-nitrophenol show that the 2D Ag-Cu core@shell structure has better synergistic catalytic performance than Janus structure and Ag plates. In addition to surface-related synergistically enhanced bactericidal performance, their antibacterial effect can also be significantly enhanced by near infrared light irradiation. These results indicate that 2D Ag-Cu heterostructures can benefit from both synergistically improved surface activity and great optical responsive characteristics.
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Water Conservation Science and Engineering
·
2022
·Vol. 7
·期 4
·419-428
·
IF 0
Fu Wen-Qiang,Wen Yi,Tang Wen-Jun,Yao Zeng-Yu
Polymer-enhanced ultrafiltration (PEUF) is emerging as a competent technique for removing heavy metal contaminants from effluents. Biopolymers are prospective size-enhancers due to their abundant biodegradable and renewable nature. Melanin is a type of biopolymer that binds heavy metal ions effectively. Chestnut shell pigment (CSP) is the melanin extracted from an agro-waste. This study evaluated the feasibility of employing melanin in PEUF for heavy metal removal from wastewater by using CSP and Cu(II) as the model melanin and heavy metal, respectively. The effects of pH, Cu(II), and CSP concentrations in the feed solution on the Cu(II) removal were investigated. At the optimized condition of pH 6 and a loading ratio of 33.3, more than 99% of the copper was removed by a polyethersulfone membrane with a molecular weight cut-off of 50 kDa. The binding process was rapid, completed within 22 min, and fit well with the pseudo-second-order kinetic model. The binding equilibrium data fit well with the Langmuir isotherm with a maximum binding capacity of 0.8733 mmol·g −1 . Mg 2+ and Ca 2+ hindered the Cu(II) removal, while Na + and K + affected it negligibly. Before and after Cu(II) binding, the CSP samples were characterized using Fourier transform-infrared spectrometry. The cation exchange with H + and NH 4 + ions and complexation with the carboxyl, hydroxyl, and amine groups could have been the primary mechanisms of Cu(II) binding as forms of Cu 2+ and CuOH + onto the CSP. CSP could be a promising size-enhancing biopolymer for copper removal from aqueous solutions. Graphical abstract
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Catalysts
·
2022
·Vol. 12
·期 12
·1515
·
IF 4.501
Ding Zhang,Yun-Fei Li,Li-Xue Liu,Lei Duan,Zhi-Li Ren,Shou-Dong Xu,Liang Chen,Hui-Juan Guo,Yi Huang,Li-Juan Shi,Qun Yi
Among clean energy transformation devices, fuel cells have gained special attention over the past years; however, advancing appropriate non-valuable metal impetuses to halfway supplant the customary Pt/C impetus is still in progress. In this paper, we propose a specific electrocatalyst in the formula of highly-active Cu species, associated with coated carbon (Cu@C-800), for oxygen reduction reaction (ORR) through post-treatment of a self-assembled precursor. The optimized catalyst Cu@C-800 showed excellent ORR performance (i.e., the onset potential was 1.00 V vs. RHE, and half-wave potential of 0.81 V vs. RHE), high stability, resistance to methanol, and high four-electron selectivity. The enhancement is attributed to the synergy between the carbon matrix and a high explicit surface region and rich Cu nano-species.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Arsalan Muhammad,Saddique Imram,Baoji Miao,Awais Azka,Khan Ilyas,Shamseldin Mohamed A.,Mehrez Sadok
We aimed to synthesize sensitive electrochemical sensors for hydrogen peroxide sensing by using zinc oxide nanorods grown on a fluorine-doped tin oxide electrode by using the facial hydrothermal method. It was essential to keep the surface morphology of the material (nanorods structure); due to its large surface area, the concerned material has enhanced detection ability toward the analyte. The work presents a non-enzymatic H2O2 sensor using vertically grown zinc oxide nanorods on the electrode (FTO) surfaces with Cu nanoparticles deposited on zinc oxide nanorods to enhance the activity. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-Ray (EDX), X-ray diffraction (XRD), and electrochemical methods were used to characterize copper–zinc oxide nanorods. In addition to the high surface area, the hexagonal Cu-ZnO nanorods exhibited enhanced electrochemical features of H2O2 oxidation. Nanorods made from Cu-ZnO exhibit highly efficient sensitivity of 3415 μAmM−1cm−2 low detection limits (LODs) of 0.16 μM and extremely wide linear ranges (0.001–11 mM). In addition, copper-zinc oxide nanorods demonstrated decent reproducibility, repeatability, stability, and selectivity after being used for H2O2 sensing in water samples with an RSD value of 3.83%. Cu nanoparticles decorated on ZnO nanorods demonstrate excellent potential for the detection of hydrogen peroxide, providing a new way to prepare hydrogen peroxide detecting devices.
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Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 3
·710-718
·
IF 5.344
Zhengdi Wang,Liyang Fu,Yu Zhu,Sa Wang,Guohong Shen,Lan Jin,Ruizheng Liang
The combination of chemodynamic therapy (CDT) with photothermal therapy (PTT) is an efficacious strategy in cancer treatment to acquire satisfactory therapy efficiency in the endogenous redox reaction and external laser induction. In this work, we have designed Ce doped Cu–Al layered double hydroxide (CAC-LDH) ultrathin them through a bottom-up synthesis method, and further loaded them with indocyanine green (ICG). The synthesized ICG/CAC-LDH was used as a Fenton-catalyst and photothermal agent. With the Fenton activity, the ICG/CAC-LDH nanosheets could decompose H2O2 and exhibit a low KM value (1.57 mM) and an ultra-high Vmax (4.88 × 10−6 M s−1) value. Due to the presence of oxidized metal ions, ICG/CAC-LDH could induce intracellular GSH depletion and reduce Cu2+ and Ce4+ to Cu+ and Ce3+, respectively. The generated Cu+ and Ce3+ further reacted with local H2O2 to generate toxic hydroxyl radicals (˙OH) via the Fenton reaction. Owing to the obviously enhanced absorption of ICG/CAC-LDH at 808 nm, the photothermal efficiency of ICG/CAC-LDH increased significantly compared with ICG (ΔT = 34.7 °C vs. 28.3 °C). In vitro studies substantiate the remarkable CDT/PTT efficacy, with complete apoptosis of HepG2 cancer cells (the cell viability is less than 2%) treated with 25 μg mL−1 of ICG/CAC-LDH. Furthermore, ICG/CAC-LDH could also act as a contrast agent for cancer magnetic resonance imaging (MRI) and photoacoustic imaging (PAI). These results demonstrate the potential of ICG/CAC-LDH as an integrated agent for dual-modal imaging and synergistic CDT/PTT.
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高影响因子
Frontiers in Environmental Science
·
2022
·
IF 5.411
Ma Yameng,Huang Xiao,Han Qi,Yu Jianghua,Yu Fengjiao,Zhu Jia
The strong stability of Cu–ethylenediaminetetraacetic acid (Cu–EDTA) results in the low decomplexation efficiency by the traditional Fenton process. For breaking this limitation, a three-dimensional electro-Fenton (3D-EF) system was constructed to study the decomplexation of Cu–EDTA at different pH, and the effects of Fe2+ concentration, particle electrode dosage, current density, and coexisting ions on decomplexation performance were investigated. The results showed that 3D-EF exhibited high pollutant removal efficiency in a wide pH range compared with the traditional electro-Fenton process. The optimal conditions for the removal of Cu–EDTA were as follows: the pH was 7, Fe2+ was 1 mmol L−1, granular activated carbon was 2 g L−1, and current density was 10 mA cm−2, and the optimum Cu–EDTA removal efficiency reached 90.95%. In addition, the presence of Cl− slightly improved the decomplexation efficiency, whereas NO3− and HPO42− inhibited the removal of Cu–EDTA. The kinetics of Cu–EDTA decomplexation in all experimental groups followed the first-order kinetic equation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Y. Zhang,F.F. Lin,T. Wei,L.Z. Pei
Cu bismuthate nanosheets have been synthesized by a facile hydrothermal process. The structure and morphology of the nanosheets are analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). Electrochemical performance for the determination of tartaric acid using Cu bismuthate nanosheets has also been analyzed by cyclic voltammetric (CV) method. XRD pattern shows that the Cu bismuthate nanosheets are composed of tetragonal CuBi 2 O 4 phase. Electron microscopy observations indicate that the Cu bismuthate nanosheets have the polycrystalline structure with the thickness of about 50 nm and width of 300 nm-2 μm. The morphological and structural evolution of the products have been analyzed by controlling the hydrothermal temperature and reaction time. The Cu bismuthate nanosheets modified glassy carbon electrode (GCE) is used to investigate the electrochemical performance for the detection of tartaric acid in 0.1 M KCl electrolyte. A pair of semi-reversible CV peaks are located at −0.45 V and −0.02 V at the Cu bismuthate nanosheets modified GCE in 2 mM tartaric acid. The calculated detection limit is 1.6 μM at the signal to noise ratio of 3 with tartaric acid concentration of 0.005–2 mM. The nanosheets modified GCE shows good application promising for the electrochemical detection of biological molecules.
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CATALYSIS TODAY
·
2015
·
IF 3.893
Zhiyuan Song,Dezhang Ren,Tian Wang,Fangming Jin,Qianhui Jiang,Zhibao Huo
An efficient conversion of biomass-derived cyclohexanone to cyclohexanol by in situ-formed hydrogen over Cu catalyst under hydrothermal conditions was reported at first. Among the catalysts tested, Cu exhibited high catalytic activity for the conversion of cyclohexanone, and the highest yield of 100% was obtained when Zn acted as reductant. The experiment was carried out by using gaseous hydrogen as the external hydrogen source indicated that the yield of 75.1% was lower than in situ-formed hydrogen by oxidation of Zn in water. The present study provides an efficient route by environmentally benign, commercially available Cu powder as a catalyst for cyclohexanone conversion to cyclohexanol.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 4
·978
·
IF 4.412
Peng Liu,Hui Ruan,Tiantian Li,Jiaqi Chen,Fuqiu Ma,Duoqiang Pan,Wangsuo Wu
The low cost β-zeolite and ethylenediamine modified β-zeolite (EDA@β-zeolite) were prepared by self-assembly method and used for Cu(II) removal from contaminated aqueous solution. Removal ability of β-zeolite toward Cu(II) was greatly improved after ethylenediamine (EDA) modification, the removal performance was greatly affected by environmental conditions. XPS results illustrated that the amide group played important role in the removal process by forming complexes with Cu(II). The EDA@β-zeolite showed desirable recycling ability. The finding herein suggested that the proposed composite is a promising and suitable candidate for the removal of Cu(II) from contaminated natural wastewater and aquifer.
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高影响因子
RSC Advances
·
2023
·Vol. 13
·期 49
·34524-34533
·
IF 3.9
Suo Zhao,Qiao Wang,Jin Liu,Xianglong Hao,Xiao Liu,Wenfei Shen,Zhonglin Du,Yao Wang,Mikhail Artemyev,Jianguo Tang
In this study, ZnS capped Cu–In–S (ZCIS) quantum dots doped with Mn ions are synthesized by a thermal injection method, with luminescence covering almost the entire visible area. The large Stokes shift effectively inhibits the self-absorption effect under luminescence, and the quantum yield of ZCIS quantum dots increased from 38% to 50% after ZnS capping and further to 69% after doping with Mn. First, red-, yellow-, and blue-emitting quantum dots were synthesized and then, polychromatic ensembles were obtained by mixing the trichromatic quantum dots in a different ratio. Using the home-built inkjet printer, multilayered and multicolor mixed patterns were obtained for information pattern storage and multilayer pattern recognition and reading.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2011
·
IF 2.141
Qiang Chen,Dun-qiang Tan,Rui Liu,Wen-xian Li
Electrodepositing Al coatings on W 90 Cu 10 foils in AlCl 3 + LiAlH 4 Tetrahydrofuran–benzene electrolyte was reported in this work. Effects of variations in molar ratios of AlCl 3 /LiAlH 4 , current density and plating time on surface morphology and crystal orientations were studied, and the optimal values of three parameters were preliminarily gained. Results showed that Al coatings displayed dense and cone-shaped micro-crystallites, and the particle size of coatings increased obviously with increasing current density or decreasing the proportion of AlCl 3 . It was indicated that all of the electrodeposits exhibited a strong preferred (111), (220) crystal orientation, and the (220) crystal orientation became strong along with electroplating time and current density, but weak with the proportion of AlCl 3 in baths. On the contrary, the changes of the (111) orientation exhibited an opposite trend.
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高影响因子
危险品化学品经营许可证（带存储）