RSC Advances
·
2016
·Vol. 6
·期 99
·96997-97003
·
IF 3.289
Xiang Ma,Haidi Liu,Weiman Li,Shengpan Peng,Yunfa Chen
A copper-based metal organic framework (MOF-199) with controllable size and shape was synthesized and used to remove gaseous methyl mercaptan (CH3SH). Characterizations of the synthesized MOF-199 samples before and after desulfurization were carried out by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) to observe the adsorption mechanism of CH3SH on MOF-199. The adsorption performance of the synthesized MOF-199 materials and commercialized activated carbon (AC) and Cu loaded AC were evaluated by breakthrough experiments. All three synthesized MOF-199 materials show better performance than commercialized AC. The morphology and texture of MOF-199 materials have great influence on the performance of the adsorption process. The MOF-199 material synthesized by a hydrothermal method exhibited the highest sulfur compound capacity among the synthesized MOF-199 materials (74.7 mg of CH3SH/1 g MOF-199). The color change of MOF-199 during the CH3SH capturing process, indicated a strong interaction between the unsaturated copper sites and –SH group which finally formed CuS and gave rise to obvious damage to the MOF structure.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 5
·1-9
·
IF 2.101
Liu Fenfen,He Juan,Zeng Mulang,Hao Juan,Guo Qiaohui,Song Yonghai,Wang Li
Abstract In this work, a facile strategy to synthesize Cu–hemin metal-organic frameworks (MOFs) with peroxidase-like activity was reported. The prepared Cu–hemin MOFs were characterized by various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, UV–visible absorbance spectra, and so on. The results showed that the prepared Cu–hemin MOFs looked like a ball-flower with an average diameter of 10 μm and provided a large specific surface area. The Cu–hemin MOFs possessing peroxidase-like activity could be used to catalyze the peroxidase substrate of 3,3,5,5-tetramethylbenzidine in the presence of H 2 O 2 , which was employed to detect H 2 O 2 quantitatively with the linear range from 1.0 μM to 1.0 mM and the detection limit was 0.42 μM. Furthermore, with the additional help of glucose oxidase, a sensitive and selective method to detect glucose was developed by using the Cu–hemin MOFs as catalyst and the linear range was from 10.0 μM to 3.0 mM and the detection limit was 6.9 μM. This work informs researchers of the advantages of MOFs for preparing biomimetic catalysts and extends the functionality of MOFs for biosensor application. Graphical Abstract
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 14
·8709-8717
·
IF 3.108
Yu Hao Wang,Wen Gui Gao,Hua Wang,Yan E. Zheng,Wei Na,Kong Zhai Li
A series of Cu–ZrO2 (CZ) catalysts with different surface area, copper surface area (SCu), oxygen vacancy concentration, and interaction between Cu and ZrO2 features were synthesized. The factors that could affect catalytic activity of CO2 hydrogenation to methanol were investigated. The interaction between Cu and ZrO2 is crucial for determining the catalytic activity. The catalyst possessing the strongest interaction between Cu and ZrO2, exhibited the optimum catalytic activity. The evolution of carbonaceous species and pyridine adsorption over CZ catalysts were investigated using in situ DRIFT spectroscopy. It is found that the hydrogenation of formate species is a rate-limiting step and H spillover plays an important role. The hydrogenation of formate species and H spillover are strongly dependent on the interaction. These results provide a new way of understanding the activity dependence and reaction mechanism of CO2 hydrogenation to methanol over CZ catalysts.
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APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Xinlei Wang,Kui Ma,Lihong Guo,Ye Tian,Qingpeng Cheng,Xueqin Bai,Jingjing Huang,Tong Ding,Xingang Li
Herein, we reduced the ZnO-modified copper phyllosilicate to synthesize a series of Cu/ZnO/SiO 2 catalysts ( x CuZn/SiO 2 ) which were mixed with γ-Al 2 O 3 for dimethyl ether steam reforming (DME SR). The structure and the formation of copper phyllosilicate were systematically characterized by nitrogen adsorption, XRD and IR. The novel synthetic route led to the remarkably high dispersion of copper species and adjustable Cu 0 /Cu + ratio on the catalyst surface, resulting in the superior catalytic performance for DME SR. The amount of Cu 0 and Cu + sites on the catalyst surface was dramatically affected by ZnO loading, and the turnover frequency results indicated that the 4CuZn/SiO 2 catalyst (Cu/Zn = 4) with the Cu 0 /Cu + ratio of 1 showed the highest catalytic performance. The XPS, H 2 -TPR and TEM results revealed the existence of strong interaction between Cu species and ZnO on the reduced 4CuZn/SiO 2 catalyst, which suppressed the reverse water-gas reaction and prevented the sintering of copper.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Li Wang,Han Yang,Juan He,Yayun Zhang,Jie Yu,Yonghai Song
Herein, a Cu-hemin metal-organic-frameworks (MOFs)/chitosan (CS)-reduced graphene oxide (CS-rGO) nanocomposite with unique peroxidase-like bioactivity and good electrical conductivity was prepared for electrochemical H 2 O 2 sensing for the first time. The prepared Cu-hemin MOFs/CS-rGO nanocomposites were well characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray powder diffraction, UV–vis spectroscopy and electrochemical techniques. The results showed that after the Cu-hemin MOFs were formed on the CS-rGO surface, the crystalline structure of the Cu-hemin MOFs was kept while the size of Cu-hemin MOFs was decreased and the electrical conductivity of the nanocomposites was enhanced greatly as compared with that of Cu-hemin MOFs. The unique peroxidase-like bioactivity and good electrical conductivity as well as some novel properties of Cu-hemin MOFs/CS-rGO nanocomposites resulted in perfect electrochemical performances towards the reduction of hydrogen peroxide (H 2 O 2 ), superior to some mimic enzymes. The Cu-hemin MOF/CS-rGO was used to construct a novel H 2 O 2 electrochemical sensor which exhibited wide linear range (0.065–410 μM) and low detection limit (0.019 μM). The study might provide a new proposal for preparing perfect hemin-based materials as mimetic peroxidase in the electrochemical sensing.
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高影响因子
Journal of Food Measurement and Characterization
·
2016
·Vol. 11
·期 2
·548-555
·
IF 0.521
Xiaohong Zhang,Zhidong Zhao,Xiongwei Lou,Jian Li,Guohua Hui
A maltose, L-rhamnose sensor based on porous Cu foam and electrochemical techniques was investigated in this paper. Cu foam material was prepared and characterized by scanning electron microscopy (SEM). The electro-oxidation reaction process of sweeteners occurred on Cu foam electrode was evaluated by cyclic voltammetry (CV) scanning. At an applied potential of 0.5 V, the linear range for maltose is 0.18–3.47 mM with sensitivity of 1.0492 mA cm −2 mM −1 . The limit of detection (LOD) was 15.86 μM (S/N = 3). The linear range for maltose is 0.18–3.47 mM with sensitivity of 0.6881 mA cm −2 mM −1 . The LOD was 24.18 μM (S/N = 3). Compared with Cu sheet electrode, Cu foam electrode showed higher current response towards maltose and L-rhamnose, leading to enhanced electrocatalytic activity, higher sensitivity, and lower LOD. Sweetener qualitative discrimination was carried out by stochastic resonance (SR) signal-to-noise ratio (SNR) spectrum eigen peak located noise intensities.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 34
·期 8
·2331-2341
·
IF 2.007
Meng Yue,Xia Shengjie,Pan Guoxiang,Xue Jilong,Jiang Junhui,Ni Zheming
Copper(II) Schiff-base Complexes (Salen-Cu(II)) intercalated zinc-chromium layered double hydroxides (ZnSBCuCr-LDHs) were successfully prepared via coprecipitation. Then, a novel photocatalytic material Zn-Cu-Cr composite oxides (ZnSBCuCr-MO) was prepared after calcination at 500 °C with ZnSBCuCr-LDHs as precursor. The structure and properties of the materials were thoroughly characterized by powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the materials were investigated by photodegradation of a cationic dye Rhodamin B (RhB), which was hard to adsorb by LDHs. The effects of the photocatalyst dosage, the initial pH and temperature of RhB solution on the photocatalytic efficiency were discussed. The results showed that ZnSBCuCr-MO displayed higher photocatalytic activity for RhB than calcined ZnCr-LDHs (ZnCr-MO) and calcined ZnCuCr-LDHs (ZnCuCr-MO). Meanwhile, ZnSBCuCr-MO exhibited better stability and reusability. In addition, the possible photocatalytic mechanism and degradation pathway for RhB were studied through density functional theory (DFT) calculation of the RhB molecule, UV-vis absorption variation and LC-MS analyses of the RhB solution.
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RSC Advances
·
2016
·Vol. 6
·期 81
·78136-78150
·
IF 3.289
Li Lv,Jing Zhang,Shaojun Yuan,Liqiang Huang,Shengwei Tang,Bin Liang,Simo O. Pehkonen
To enhance the adsorption capacity of crosslinked chitosan (CCS) microspheres towards Cu(II) ions, well-defined poly(glycidyl methacrylate) (PGMA) brushes were grafted onto the surfaces of CCS microspheres via surface-initiated atom transfer radical polymerization (ATRP) for subsequent conjugation of polyethylenimine (PEI). The resultant PEI-grafted CCS (defined as CCS-g-PGMA-c-PEI) microsphere was used as an effective adsorbent to uptake Cu(II) ions from aqueous solution. Success in each functionalization step was ascertained by ATR-FTIR, XPS, SEM and water contact angle measurements. Batch adsorption experiments were performed to determine adsorption kinetics, adsorption isotherms and thermodynamics of Cu(II) ions on the CCS-g-PGMA-c-PEI microspheres. The adsorption equilibrium of Cu(II) ions on the microspheres was found to be rapidly established within 60 min at an optimal solution pH of 5.0, and the adsorption kinetics was well represented by the pseudo-second-order model, together with a significant effect of mass transfer on the Cu(II) adsorption rate. The Langmuir-fitted maximum adsorption capacity was about 3.58 mmol g−1 (229 mg g−1), and the calculated thermodynamic parameters demonstrated an endothermic and spontaneous adsorption process of Cu(II) ions. The PEI-grafted CCS microspheres also exhibited good regenerability and stability for recycle applications. The postulated adsorption mechanism was proposed to account for the adsorption process of Cu(II) ions on the CCS-g-PGMA-c-PEI microspheres.
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Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 4
·751-756
·
IF 0
Yanyan Chen,Lijian Huang,Shenjie Li,Daocheng Pan
Water-soluble Cu+- and Ag+-doped ZnxCd1−xS quantum dots have been successfully synthesized via a facile and green method. All synthetic procedures were conducted in the open air at 95 °C. Hydrophilic glutathione was used as the capping agent. The influence of the dopant concentration in alloyed ZnxCd1−xS QDs has been investigated. The as-prepared Cu+- and Ag+-doped ZnxCd1−xS/ZnS core–shell quantum dots exhibit tunable emission covering the whole visible light region and the photoluminescence quantum yield (PL QY) can reach as high as 20% and 31%, respectively.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2015
·
IF 2.858
Zhan-Chao Wu,Zhao-Zhan Wang,Jie Liu,Jin-Hua Yin,Shao-Ping Kuang
A new porous magnetic chitosan modified by melamine (MA-CS/Fe 3 O 4 ) was synthesized. The compositions and surface topographies were characterized by infrared (IR) spectroscopy, X-ray diffraction (XRD) analysis, thermogravimetric (TG) analysis and scanning electron microscope (SEM), respectively. The results of adsorption kinetics showed the adsorption behavior could be better described by the pseudo-second-order equation ( R > 0.999). The adsorption isotherm was well fitted by the Langmuir equation ( R > 0.999), and the values of separation factors were in the range of 0–1.0. The maximum adsorption capacity for Cu(II) was 2.58 mmol g −1 at the optimal experimental conditions, which were pH = 5.5, t = 25 min, C 0 = 5.0 mmol L −1 . The rate-controlling step was supposed to be chemical adsorption rather than mass transport. The adsorbent still exhibited high adsorption capacity after five regeneration cycles. The adsorption mechanism was due to coordination between Cu(II) and N atoms.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2014
·
IF 3.674
Xiuquan Jia,Jiping Ma,Min Wang,Zhongtian Du,Fang Lu,Feng Wang,Jie Xu
The promoted effect of Cu(NO 3 ) 2 on aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) catalyzed by VOSO 4 in acetonitrile was intensively investigated. It was revealed that Cu(NO 3 ) 2 facilitated the activation of VOSO 4 to generate active V 5+ species via the generation of NO x gas. The high DFF selectivity is ascribed to Cu 2+ cation which can effectively prohibit oxidative C C bond cleavage reaction of HMF and prevent radical reaction of DFF to humins. In addition, the polarity of solvent plays a great role on high selectivity of DFF.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 47
·20763-20768
·
IF 4.197
Lan Wang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
We reported temperature-dependent photoluminescence (PL) studies on Cu–Zn–In–S quantum dot (QD) thin films. In this paper, cadmium-free and luminescent Cu–Zn–In–S quantum dot thin films were in situ formed by thermal decomposition of molecular-based precursors in the open air, without need of the complicated quantum dot synthesis. Molecular-based precursor solutions were prepared by dissolving Cu2O, ZnO, and In(OH)3 in the ethanol solution of butylamine and carbon disulfide. The effects of sintering temperature, sintering time, and the concentration of capping agents on the photoluminescence properties of Cu–Zn–In–S QD thin films have been systematically investigated. It was found that alkali metal ions play an important role in enhancing the PL quantum yield of quantum dot thin films. The as-prepared QD thin films show composition-tunable emission in the range of 535 nm to 677 nm, and the absolute PL quantum yields can reach as high as 22.1%. All of the as-deposited QD thin films show a single-exponential decay to temperature, indicating that these cadmium-free QD thin films have high potential as temperature probes.
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