Molecular Catalysis
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2018
·
IF 0
Fuhai Li,Dairong Hu,Yahui Yuan,Binbin Luo,Yibing Song,Songtao Xiao,Guanghui Chen,Yiwen Fang,Fushen Lu
To mimic biological enzyme in catalysis, metal-imidazole-salen complexes were proposed (via DFT calculation) and synthesized in situ within the cavities of Y zeolite. Among the synthesized zeozymes, the Cu-salenIIY exhibited a prominent catalytic efficiency for the selective oxidation of benzyl alcohol. Specifically, the activity and selectivity of the encapsulated catalyst were comparable to those of the free Cu-salenII complex in solution. Furthermore, the high activity and selectivity were preserved during the repeated cycles. The similarity in the initial activity implies that the Cu-salenII complex just resides in the cavity of the zeolite Y, and its intrinsic properties responsible for the catalytic activity keep intact after encapsulation. The confinement of zeolite nanocavities effectively inhibited the dimerization or aggregation of the Cu-salenII complex and prevented the active species from escaping into reaction solution, thus resulting in a remarkably improved in the catalytic reusability and durability.
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ChemElectroChem
·
2018
·Vol. 6
·期 3
·714-723
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IF 4.446
Haoyang Tian,Jintao Liang,Xuli Ma,Lele Cao,Xueyan Hu,Mengting Gao,Huimin Yang,Zhenhai Liang
Graphical Photo finish : A catalyst made of MoS 2 nanosheets loaded on Cu-doped CdS nanorods is synthesized through a facile two-step solvothermal approach. The working electrode is formed by loading a certain amount of catalyst on fluorine tin oxide. A significant increase in the photoelectrochemical performance is observed, owing to the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer from the Cu 2+ doping. Transition-metal ion doping and efficient decoration by using a co-catalyst have been proven to effectively inhibit the recombination of photogenerated electron-hole pairs and broaden the visible-light response region. Here, we have constructed MoS 2 nanosheets decorated on a copper-doped CdS nanorod composite as a noble-metal-free photoelectrocatalyst. This kind of composite material was constructed through a simple solvothermal method. The morphology, structure, chemical states, photoelectrochemical properties, and other properties were tested by using a diverse range of analytical techniques. Owing to the Cu 2+ doping and the excellent electron-capturing ability of MoS 2 , 5 % MoS 2 /Cu−CdS (with 7 % Cu 2+ doping in CdS) exhibits excellent hydrogen evolution reaction with a rate of 10.18 mmol h −1 g −1 , which is about 48 times higher than that of pure CdS. A significant increase in the photoelectrochemical performance of the composite catalytic material benefits from the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer, owing to the Cu 2+ doping. These findings provide a new thought for further research of the ion doping in photoelectrocatalytic field.
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高影响因子
RSC Advances
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2018
·Vol. 8
·期 59
·34151-34160
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IF 2.936
Changjiang Yu,Dashuai Zhang,Xinyu Dong,Qiang Lin
The reduction behavior of Fe3+ during the preparation of a zero-valent iron cocoanut biochar (ZBC8-3) by the carbothermic reduction method was analyzed. Fe3+ was first converted into Fe3O4, which was subsequently decomposed into FeO, and finally reduced to Fe0. A minor amount of γ-Fe2O3 was produced in the process. The isothermal thermodynamic data for the removal of Cu(II) over ZBC8-3 followed a Langmuir model. The Langmuir equation revealed a maximum removal capacity of 169.49 mg g−1 at pH = 5 for ZBC8-3. The removal of Cu(II) over ZBC8-3 fitted well to a pseudo-first-order equation, which suggested that the rate limiting step of the process was diffusion. The Cu(II) removal mechanism on ZBC8-3 involved the reduction of Cu(II) by Fe0 to produce Cu0 and Cu2O, while CC, C–O–, and –O–H formed a complex with Cu(II).
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PubMed
高影响因子
ANALYST
·
2018
·Vol. 143
·期 18
·4442-4447
·
IF 3.864
Pengjuan Ni,Dafeng Jiang,Chuanxia Chen,Yuanyuan Jiang,Yizhong Lu,Zhenlu Zhao
In this work, we propose a fluorescence method for the simultaneous detection of glutathione (GSH) and histidine (His) based on the Cu(II)-thiamine (Cu(II)-TH) system. It is well established that non-fluorescent thiamine (TH) can be oxidized by Cu(II) to generate fluorescent thiochrome (TC) under alkaline conditions. The introduction of GSH and His can inhibit the oxidation of TH by Cu(II) due to the strong affinity between Cu(II) and GSH or His. With this strategy, the detection limit for GSH and His is 10.5 nM and 26.4 nM, respectively. The developed method shows several obvious advantages: (1) simplicity in design and operation without the utilization of fluorescent nanomaterials or probes; (2) time-saving detection process since all the detection process is completed within 15 min; (3) cost-effectiveness by using TH as the fluorescent substrate; and (4) higher sensitivity and good selectivity. Therefore, it shows great potential in biosensing fields.
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高影响因子
RARE METAL MATERIALS AND ENGINEERING
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2018
·
IF 0.29
Han Wensong
Cu-Ag particles with different molar ratios have been prepared in the hyperbranched polyester matrix using ascorbic acid as a reducing agent. The third generation hyperbranched polyester has been synthesized by step by step polymerization using the first generation hyperbranched polyester as core molecular and 2, 2-dimethylol propionic acid as branched monomer. The synthesized hyperbranched polyester and Cu-Ag alloy were characterized by FT-IR, 1 H-NMR, UV-vis spectra, X-ray diffraction (XRD), SEM, Energy Dispersive X-ray (EDX), Laser particle size measurement, TEM, etc. The XRD and EDX studies confirm the formation of Cu-Ag alloy. Laser particle size measurement, SEM and TEM studies show that the particles of the Cu-Ag alloy are well-dispersed with average size of 120 nm. The thermal properties of the Cu-Ag alloy have been studied by thermogravimetric Analysis (TGA). The results show that the measurement values are close to the theoretical ones.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 6
·1-10
·
IF 1.961
Mao Jie,Quan Xie,Wang Jing,Gao Cong,Chen Shuo,Yu Hongtao,Zhang Yaobin
Heterogeneous Fenton-like reaction has been extensively investigated to eliminate refractory organic contaminants in wastewater, but it usually shows low catalytic performance due to difficulty in reduction from Fe(III) to Fe(II). In this study, enhanced catalytic efficiency was obtained by employing Cu-doped BiFeO 3 as heterogeneous Fenton-like catalysts, which exhibited higher catalytic performance toward the activation of H 2 O 2 for phenol degradation than un-doped BiFeO 3 . BiFe 0.8 Cu 0.2 O 3 displayed the best performance, which yielded 91% removal of phenol (10 mg L –1 ) in 120 min. The pseudo first-order kinetic rate constant of phenol degradation in BiFe 0.8 Cu 0.2 O 3 catalyzed heterogeneous Fenton-like reaction was 5 times higher than those of traditional heterogeneous Fenton-like catalysts, such as Fe 3 O 4 and goethite. The phenol degradation efficiency could still reach 83% after 4 cycles, which implied the good stability of BiFe 0.8 Cu 0.2 O 3 . The high catalytic activity of BiFe 0.8 Cu 0.2 O 3 was attributed to the fact that the doping Cu into BiFeO 3 could promote the generation of Fe(II) in the catalyst and then facilitate the activation of H 2 O 2 to degrade the organic pollutants.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Mao Xia Guo,Yuan Fang Li
Cu (II)-based metal-organic gels (Cu-MOGs), which are formed by 4-[2,2′:6′,2″-terpyridine]-4′-ylbenzoic acid (Hcptpy) and Cu (II) through ionic interactions, π-π stacking, van der Waals and hydrogen bonding , have been simply synthesized and used for the preparation of Cu (II)-based metal-organic xerogels (Cu-MOXs). Owing to the metal active sites in Cu-MOXs, Cu-MOXs were successfully applied to chromogenic experiment. The peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB), which could be catalyzed by Cu-MOXs from TMB to the oxidation state of TMB (oxTMB) and the color of TMB could be changed from colorless to blue with maximum absorbance at 657 nm, was selected as chromogenic agent. Thus, the Cu-MOXs-TMB-H 2 O 2 system based on MOXs was established. Due to the inhibitory effect of dopamine (DA) on oxidation process of TMB, the characteristic absorption peak intensity of oxTMB decreased when the DA was added into the mixed solution. Subsequently, the Cu-MOXs-TMB- H 2 O 2 system was used for DA detection. The linear range for DA was 0.5 μM–20 μM and the detection limit was 85.76 nM. Our work has helped to develop the promising application of Cu-MOGs material in the field of nanozymes property.
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高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Bo Ge,Lu Han,Xin Liang,Fengyan Li,Xipeng Pu,Xiaotao Zhu,Zhaozhu Zhang,Xin Shao,Chuanyu Jin,Wenzhi Li
Materials with superhydrophobicity have been successful in removing and recovering oily pollutants in water, however, it cannot get rid of water soluble pollutants. In this paper, we prepared a superhydrophobic Cu-BiOBr surface which combined the superhydrophobicity with the photodegradation property to realize the oil/water separation and the removal of water-soluble pollutants. The result shows that the surface of the material has macroporous (620 nm) and mesoporous (3.2 nm) structure. The degradation efficiency for Rhodamine B (Rh B) does not change after 5 times of repeated use, which indicates the good degradation stability of the material. In addition, the surface remains superhydrophobic and high flux for up to 11 cycles. The preparation process is simple and economical with no complicated and expensive equipment but only filtration and spraying used. A 13 cm × 13 cm superhydrophobic Cu-BiOBr mesh was also prepared to verify the feasibility of large scale fabrication.
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 87
·70758-70765
·
IF 3.84
Leli Wang,Ying Wu,Yongjun Men,Jianan Shen,Zhengping Liu
Single electron transfer living radical polymerization (SET-LRP) was employed to prepare thermal-sensitive starch graft poly(N-isopropylacrylamide) (Starch-g-PNIPAM) with soluble Starch-Br as macro-initiator at molecular level. And Starch-g-PNIAPM with improved graft ratio and controlled length of graft chains were obtained. The effects of molar ratio of monomer to initiator and temperature on polymerization were investigated. The thermal responsibilities investigated by 1H NMR and UV showed that the LCST ranged from 31.5 °C to 23 °C with the increase of the length of PNIPAM chains and the concentrations of copolymers. Starch-g-PNIPAM hydrogels were gained when adding N,N′-methylenebisacrylamide as crosslinking agent and the swelling and deswelling behaviors were also investigated. The obtained hydrogels possess a high equilibrium swelling ratio as high as 1826%, and an extremely rapid shrinking rate as fast as losing more than 85% of water in 5 min.
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高影响因子
ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Xiaorong Gan,Huimin Zhao,Shuo Chen,Hongtao Yu,Xie Quan
In the present work, three-dimensional porous HxTiS2 nanosheet–polyaniline (PANI) nanocomposites were first synthesized by a two-step method. First, HxTiS2 ultrathin nanosheets were prepared by the lithium intercalation and exfoliation method, followed by the surface polymerization reactions of aniline. The influences of the amount of HxTiS2 nanosheets on the nanocomposite morphology and electrochemical performances of the nanocomposites modified glass carbon electrode (HxTiS2 nanosheet–PANI/GCE) were investigated. The results demonstrated that the incorporation of HxTiS2 nanosheets as a suitable substrate can regulate the growth of PANI, enhance the electrode stability and improve interfacial electron transfer rates. In addition, based on the nanocomposites, we developed a novel electrochemical sensor to directly detect trace Cu2+, and discovered that the coordination interaction between Cu2+ cations and the N atoms of the imine moieties in PANI endowed the electrochemical sensor with high selectivity. Because of the synergetic effects of HxTiS2 nanosheets and PANI, the as-prepared electrochemical sensor exhibited highly sensitive and selective assaying of Cu2+ with a detection limit of 0.7 nM (signal-to-noise ratio (S/N) equal to 3) and a linear range from 25 nM to 5 μM, under optimal conditions.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2015
·Vol. 2015
·期 10
·1692-1699
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IF 2.942
Zhen-Zhen Wang,Shang-Ru Zhai,Bin Zhai,Qing-Da An
Graphical An Fe 3 O 4 /Cu nanocatalyst that exhibits excellent catalytic performance in the degradation of 4-nitrophenol (4-NP) (the reaction was accomplished within 4 min), rhodamine B (within 3 min), and methylene blue (within 1 min) as well as superior stability (can be reused at least five times) was successfully synthesized through a green one-step solvothermal method with ethylene glycol as reductant and reaction media. Noble-metal-derived functional materials have played indispensable roles in the reduction of dye under aqueous conditions; however, their cost and separation are great limitations on their wider practical applications. Therefore, an alternative preparation of comparable materials with low cost and good ease of separation is required. Herein magnetic microspheres (i.e., Fe 3 O 4 /Cu) were synthesized through a green single-step solvothermal method for the first time with ethylene glycol serving as reductant and reaction media. The prepared materials were characterized by means of powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometry, a vibrating sample magnetometer, and so forth. Additionally, by employing the reduction of 4-nitrophenol to 4-aminophenol as a model reaction, the effects of preparation time and the initial dosage of Cu(NO 3 ) 2 on the rate constant of the catalytic reduction reaction were systematically investigated. Moreover, the obtained hybrid nanocatalysts were also applied to reduce and degrade common organic dyes (rhodamine B and methylene blue) in the presence of NaBH 4 . Quite significantly, it was shown that it could catalytically degrade different organic dyes with excellent catalytic performance and high stability in recycled reactions up to five times. More interestingly, the material can be easily separated from the catalytic system for further use.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 37
·29040-29047
·
IF 3.84
Bin Wang,Chao Wen,Yuanyuan Cui,Xi Chen,Yu Dong,Wei-Lin Dai
A series of Cu-based TiO2-supported catalysts were synthesized via facile ammonia evaporation for the selective hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG). A 100% conversion of DMO, 99% selectivity for EG, and super stability were achieved over the 20% Cu/P25 TiO2 catalyst. The effect of the crystal phase of the titania support and the interaction between Cu and P25 were investigated. The active copper species located at the interface between the anatase and rutile phases play important roles in the selective hydrogenation. The excellent catalytic performance was mainly attributed to better copper dispersion and an appropriate ratio of Cu0/Cu+, which stems from the intimate interaction between Cu and the P25 support.
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高影响因子
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