NANOTECHNOLOGY
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2021
·Vol. 32
·期 19
·195403
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IF 3.874
Ding Zhang,Xiaoning Tang,Zhaoguang Yang,Ying Yang,Haipu Li
The development of renewable energy conversion and storage has triggered the development of electrode materials for oxygen evolution reaction (OER) and supercapacitors. Here we report a highly active Cu doped NiFe nanosheets hydroxide electrode with rich oxygen vacancies (OVs) (denoted as H-NiFeCuO/NF) prepared by in situ anodic electrodeposition on the three-dimensional macroporous nickel foam (NF) substrate followed by heat treatment with H2. The as-prepared H-NiFeCuO/NF electrode showed the initial potential of 1.44 V (versus RHE) for OER and 980 F g−1 specific capacity as supercapacitor in 1 M KOH. Further investigation suggested that the tuning of composition and structure by doping copper ions and creating OVs helped accelerate the electrochemical reactions. This practice provides an efficient approach for the fabrication of heteromultimetallic hydroxide monolithic electrode with high performance in OER or supercapacitor application.
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Acta Pharmaceutica Sinica B
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2021
·
IF 11.614
Lin Hou,Yanlong Liu,Wei Liu,Mervat Balash,Hongling Zhang,Yi Zhang,Huijuan Zhang,Zhenzhong Zhang
Although approved as an alcohol-abuse drug, disulfiram (DSF) exhibited potential anticancer activity when chelated with copper (Cu). However, the low level of intrinsic Cu, toxicity originated from exogenous Cu supplementation, and poor stability of DSF in vivo severely limited its application in cancer treatment. Herein, we proposed an in situ DSF antitumor efficacy triggered system, taking advantages of Cu-based metal-organic framework (MOF). In detail, DSF was encapsulated into Cu-MOF nanoparticles (NPs) during its formation, and the obtained NPs were coated with hyaluronic acid to enhance the tumor targetability and biocompatibility. Notably, DSF loaded Cu-MOF NPs maintained stability and integrity without Cu 2+ leakage in blood circulation, thus showing excellent biosafety. Once accumulating at tumor site, NPs were internalized into tumor cells via receptor-mediated endocytosis and released DSF and Cu 2+ simultaneously in the hyaluronidase-enriched and acidic intracellular tumor microenvironment. This profile lead to in situ chelation reaction between DSF and Cu 2+ , generating toxic DSF/Cu complex against tumor cells. Both in vitro and in vivo results demonstrated the programmed degradation and recombination property of Cu-based MOF NPs, which facilitated the tumor-specific chemotherapeutic effects of DSF. This system provided a promising strategy for the application of DSF in tumor therapy.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xinpeng Liu,Baohua Wang,Xiaoli Lv,Qingmei Meng,Menghong Li
The H 2 S removal performances of four deep eutectic solvent (DES) based nanofluid (NF) systems were measured using dynamic absorption experiment. The Cu containing NF system is found to be an excellent absorbent for H 2 S removal with a significantly enhanced desulfurization performance compared with DES original solution. Besides, the NF systems have relatively high regeneration performance. The NF systems and Cu nanoparticles before and after absorption as well as after regeneration were characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM) and energy dispersive spectrum (EDS). It is found that the ethanolamine , choline cation and sulfur were accumulated on the surface of Cu nanoparticles after absorption, and the bulk elements on the surface were identified as Cu and S after regeneration. The S −2 was existed in the form of Cu 2 S, and some sulfur was oxidized to zero-valent sulfur after regeneration.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xin Zhou,Haopeng Luo,Bo Sheng,Xingyu Chen,Yihao Wang,Quanyuan Chen,Juan Zhou
The limited production of Cu + in the Cu 2+ /PMS processes constrained its large-scan application for the elimination of organic pollutants . In this study, molybdenum powder (Mo) was applied as the co-catalyst to improve the degradation of 2,4-dichlorophenol (2,4-DCP) in Cu 2+ /PMS system at pH 5.6. By the assistance of Mo, Cu 2+ was rapidly reduced to Cu + which exhibited super activity for the peroxymonosulfate (PMS) activation. Compared with Cu 2+ /PMS processes, the PMS decomposition rate and 2,4-DCP degradation efficiency respectively increased by 62.1% and 83.6% in the Mo co-catalytic Cu 2+ /PMS system after reaction for 20 min. The degradation of 2,4-DCP was completed via both the free radical and non-radical pathways and the free radicals rather than Cu 3+ contributed most to the reaction. In contrast to fresh Mo, the ratio of Mo 4+ increased and Mo 6+ decreased in the used Mo powder, due to the oxidation of Mo 0 by Cu 2+ and/or ∙OH and the reduction of Mo 6+ by O 2 ∙ − . Additionally, the coexistence of Cl - and humic acid with low concentrations showed little effects on the Mo/Cu 2+ /PMS system while HCO 3 − presented an obvious depression for 2,4-DCP degradation. During five cycling runs, all the degradation rates were higher than 92.8%, indicating the good stability of Mo/Cu 2+ /PMS system.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Lan-Fang Pang,Hao Wu,Meng-Xia Wei,Xiao-Feng Guo,Hong Wang
The spores of Bacillus anthracis are highly deadly to human beings and animals, and are concurrently potential biological warfare agents. Hence, the rapid and sensitive monitoring Bacillus anthracis biomarker, dipicolinic acid (DPA), is very desirable. Herein, orange/green dual-emissive carbon dots (OG-CDs) were synthesized via the hydrothermal approach. The OG-CDs not only emitted dual fluorescence at 527 and 590 nm under the single 503 nm excitation, but also exhibited excellent water solubility, good photostability and great salt tolerance. The fluorescence of the OG-CDs at 527 nm can be completely quenched when chelated with Cu(II). However, because of the stronger chelation between DPA and Cu(II), the fluorescence restored rapidly on subsequent addition of DPA. As such, the CD-Cu(II) system can be used for determination of DPA based on the fluorescence “off-on” response. Under optimum conditions, the detection limit for DPA was 56 nM, with a linear range of 0.5–12.5 μM. The established CD-Cu(II) based spectrofluorometric method has been applied to the analysis of DPA in real water samples with recoveries of 93.6%–104.3%. More remarkably, the CD-Cu(II) probe also has been successfully applied for the imaging of DPA in Escherichia coli with excellent bio-compatibility.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yanqiao Xu,Ting Chen,Zhixiang Xie,Weihui Jiang,Lianjun Wang,Wan Jiang,Xiaojun Zhang
Understanding the surface characteristic-optical property relationship of Cu-In-Zn-S (CIZS) quantum dots (QDs) is necessary for tuning the optoelectronic performances, and the photoluminescence quantum yields (PLQYs) of CIZS QDs prepared in aqueous solution are still relative low compared with that of obtained in organic phase, which seriously restricts their applications. Herein, an efficient method was proposed to prepare CIZS/ZnS/PVP composites and their application in white light-emitting diodes (WLEDs) was investigated. CIZS QDs were synthesized through hydrothermal process with the assistance of ionic liquid (IL), which could enhance the PL performance and reduce the reaction time simultaneously. The effects of hydrothermal temperature and time on the phase composition, morphology, and optical properties of CIZS QDs were systematically investigated. The results showed that the BF 4 − anion played a crucial role in boosting the emission property of CIZS QDs owing to the effective reduction of dangling bonds on the surface of QDs, which induced by the corrosion of F − deriving from the decomposition of BF 4 − . The surface modulation led to the improvement of PLQY from 6.2% to 8.4%. In addition, the PLQY of QDs was further improved to 31.2% by coating with ZnS shell around CIZS cores. Furthermore, highly luminescent CIZS/ZnS/PVP composites were prepared to eliminate the aggregation-induced fluorescence quenching effect, which was beneficial to the application in WLEDs. Consequently, a WLED achieved the color rending index (CRI) of 87.2, correlated color temperature (CCT) of 4977 K, and luminous efficacy (LE) of 90.11 lm/W by using the orange-yellow CIZS/ZnS/PVP composites and green Lu 3 Al 5 O 12 :Ce 3+ phosphors as the color conversion layer, suggesting the potential for solid state lighting application.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Min Chen,Honghong Wang,Xueyan Chen,Fei Wang,Xiaoxiao Qin,Changbin Zhang,Hong He
Photocatalysis is regarded as a promising method for indoor formaldehyde (HCHO) removal, and there remains a strong demand for the development of highly efficient photocatalysts for HCHO oxidation under visible light. Herein, by grafting nano CuO x clusters onto TiO 2 , the higher performance is achieved over Cu-TiO 2 for the photocatalytic oxidation of HCHO under visible light compared with the typical photocatalysts N-TiO 2 and g-C 3 N 4 . It is found that the presence of water greatly promotes the activity of HCHO oxidation on Cu-TiO 2 . The characterization results indicate that the CuO x clusters on TiO 2 exhibit high redox reversibility between Cu (II) and Cu (I) and greatly facilitate the migration of electrons. The mechanism of photocatalytic oxidation of HCHO was explored by using in situ DRIFTS measurements and DFT calculations. It is shown that HCHO is firstly oxidized to dioxymethylene (DOM), and then DOM is transformed into formate species under visible light irradiation. DFT calculations results indicate that the OH species are responsible for surface formate decomposition, which is the rate-determining step, while O 2 − radical is not active in formate decomposition. Our findings improve the understanding on the photocatalytic oxidation of HCHO, and the Cu-TiO 2 catalyst is a promising candidate for practical application in indoor air purification.
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SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Weijing Zhao,Xinyan Xiao,Guangming Pan,Zhihao Ye
Cu species (Cu/Cu 2 O/CuO NPs) functionalized fabric (Cu-fabric) with superhydrophobicity was fabricated through a simple in-situ reduction from Cu(OH) 2 -coated-fabric and an immersion process in n-octadecathiol (ODT) solution, in which cotton fabric served as bio-support material to immobilize Cu 2+ in the presence of NH 3 ·H 2 O. The surface morphology , elements composition, elements valance state and functional groups were detected by SEM , EDS , XPS and ATR-FTIR, respectively, and a formation mechanism of the Cu-fabric was proposed. The as-prepared Cu-fabric showed superhydrophobicity to deionized water, with a water contact angle (WCA) about 153.5 and a sliding angle (SA) about 10, and good hydrophobicity to other common household liquids. In addition, the Cu-fabric maintained chemical stability after 72 h under different extreme conditions, and mechanical durability after 200 cm of abrasion length. Furthermore, the separation efficiency of light oil/water mixtures with Cu-fabric exceeded 97% for n-dodecane, n-hexane, kerosene, cyclohexane and n-heptane and Cu-fabric maintained a high separation efficiency for n-dodecane and n-hexane after 30 separation cycles. The as-prepared Cu-fabric exhibited potential for practical application in oil/water separation of oil-contaminated industrial sewage in complicated environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Mengmeng Zhang,Gang Cheng,Yi Wei,Zhipan Wen,Rong Chen,Jinyan Xiong,Weijie Li,Chao Han,Zhen Li
Solar-driven reduction of CO 2 and H 2 O into fuels is a promising approach for addressing global warming and energy crisis. Herein, Cu + doped W 18 O 49 nanowires were prepared by a facile solvothermal method and applied in photocatalytic reduction of CO 2 . The composition and structure of pristine and Cu + doped W 18 O 49 samples have been characterized. It was found that the morphology of W 18 O 49 nanowires was changed with increasing amounts of dopant . The photocatalytic CO 2 reduction activity of W 18 O 49 nanowires and the Cu + doped W 18 O 49 samples were evaluated using H 2 O as reducing agent. The strategy of Cu + doping not only could affect the band edge position and the surface wettability , but also influenced separation of the photogenerated electron-hole pairs. It was found that Cu + doping could introduce oxygen vacancy and change the conduction edge to a more negative position for W 18 O 49 nanowires, which might be beneficial for the activation of CO 2 and promote the following CO 2 reduction. Furthermore, the higher separation efficiency of photogenerated electron-hole pairs with Cu + doping could contribute to the CO 2 photoreduction enhancement. In addition, the Cu + doped W 18 O 49 nanowires (Cu-W 18 O 49 -0.005) presented a relatively poor hydrophilic property , which might be beneficial for the adsorption of CO 2 molecules and contribute to its superior photocatalytic CO 2 reduction capability.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Lan WU,Zhi-Wei LU,Ying MA,Jun-Jun ZHANG,Guang-Quan MO,Hai-Jun DU,Jian-Shan YE
A novel electrochemical non-enzymatic sensing system was fabricated based on carbon paste electrode (CPE) encapsulating copper metal-organic frameworks (Cu-MOF/CPE) for determination of glucose by chronoamperometry in alkaline media. The as-synthesized Cu-MOF exhibited high surface area and porous structures, and the presence of carbon pastes greatly improved the conductivity of the sensing electrode. This synergic effect led to the good catalytic activity of the resulting electrode toward glucose. Under the optimized experimental conditions, the oxidation peak currents were linearly dependent on glucose concentrations in a wide range of 5–3910 μmol/L and 3910–10950 μmol/L with a limit of detection (LOD) of 0.11 μmol/L and a short response time of 0.5 s. Moreover, the developed sensor showed long-time stability, excellent selectivity as well as high resistance towards interferences. This sensor was also applied to determination of glucose in serum samples with a satisfactory result, confirming its promising applications.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Pan Zhengbin,Han Ershuan,Zheng Jingui,Lu Jing,Wang Xiaolin,Yin Yanbin,Waterhouse Geoffrey I. N.,Wang Xiuguo,Li Peiqiang
Flower-like CeO 2 nanoparticles enhance the performance of CuO nanoparticle/Cu.
The system benefits from the heterojunction between p-type CuO and n-type CeO 2 .
The selective reduction of CO 2 to methanol on the target catalyst is studied.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Lilan Huang,Leitao Zhang,Deyuan Li,Qingping Xin,Rui Jiao,Xiaoyang Hou,Yuzhong Zhang,Hong Li
Delicate design of hierarchical and porous nanoarchitectures has become a highly effective strategy to develop novel bimetallic catalyst with improved stability and catalytic performance. Herein, a core-shell hierarchical 4A zeolite/Fe@Cu Fenton-like catalyst with 4A zeolite/Fe as core components and two-dimensional Cu hydroxide nanosheets assemblies as shell structure was fabricated through a simple and scalable approach and used for phenol degradation. The results indicated that 4A zeolite/Fe@Cu bimetallic catalyst had higher catalytic activity and utilization efficiency of H 2 O 2 than that of 4A zeolite/Fe and 4A zeolite@Cu monometallic catalysts at near neutral pH. In the presence of H 2 O 2 , the 4A zeolite/Fe@Cu bimetallic catalyst could remove 95.3 % phenol after 4 h at pH 5, which was much higher than that of monometallic catalyst under the same condition. The enhanced activity of 4A zeolite/Fe@Cu was ascribed to the synergistic effect between the 4A zeolite/Fe (core) and two-dimensional Cu hydroxide nanosheets (shell). More importantly, the copper hydroxide nanosheets with open network structure on the surface of 4A zeolite/Fe@Cu improved the stability of the Fe(III) at acidic conditions, and avoided reduced catalytic efficiency of Fe(III) caused by embedding effect. This strategy provided guidance to the design of high-performance bimetallic Fenton-like catalysts.
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