Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Yingting Wang,Jiangfeng Huang,Xiaomeng Xia,Xinhua Peng
A highly efficient catalyst Fe–Co/sulfonated polystyrene (Fe–Co/SPS) was introduced and synthesized, which catalyzed BV oxidation of ketones with aqueous hydrogen peroxide to give the corresponding lactones in high yield and selectivity. Solid acid catalyst of Fe–Co/SPS has been prepared by using the 98-wt% sulfuric acid as the sulfonating agent and CoCl 2 combined FeCl 3 as sources of metal ions. Various physical–chemical characterizations including FT-IR, XRD, SEM and TGA, revealed that bimetallic ions Fe 3+ –Co 2+ species in the sulfonated polystyrene framework were responsible for the catalytic activities. The BV reaction catalyzed by Fe–Co/SPS highlighted the special effects between metal ions and protonic acids as well as solvent-free heterogeneous catalytic oxidation with excellent conversion.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 36
·19378-19389
·
IF 8.867
Yingpan Song,Fenghe Duan,Shuai Zhang,Jia-Yue Tian,Zhihong Zhang,Zhuo-Wei Wang,Chun-Sen Liu,Wen-Ming Xu,Miao Du
A series of nanocomposites comprised of iron oxide and mesoporous carbon (denoted as Fe3O4@mC) were derived from an Fe(II)-based metal–organic framework (525-MOF) by calcining at different temperatures. The advantages of chemical functionality, strong bioaffinity, and high stability of the Fe3O4@mC can be combined with the high specific surface area of 525-MOF leading to the formation of Fe3O4@mC nanocomposites as a scaffold for oxytetracycline (OTC) aptamer strands. The use of Fe3O4@mC nanocomposites reveals high OTC detection efficiency. The nanocomposite calcined at 900 °C (denoted as Fe3O4@mC900) is found to be the best candidate toward high-sensitivity and high-selectivity detection of OTC because of its excellent functionality, nanostructural properties, and high electrochemical performance. Accordingly, the Fe3O4@mC900-based electrochemical aptasensor displays high sensitivity with a low detection limit of 0.027 pg mL−1 within a broad linear range of OTC concentration from 0.005 to 1.0 ng mL−1. The aptasensor also exhibits high selectivity, reproducibility, stability, regenerability, and applicability in milk samples. All of these results indicate that the Fe3O4@mC nanocomposites that originated from 525-MOF can be applied in the fields of trace and fast antibiotic determination.
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TALANTA
·
2017
·
IF 4.162
Xue Qian Tang,Yi Dan Zhang,Zhong Wei Jiang,Dong Mei Wang,Cheng Zhi Huang,Yuan Fang Li
In this work, Fe 3 O 4 and metal–organic framework MIL-101(Fe) composites (Fe 3 O 4 /MIL-101(Fe)) was demonstrated to possess excellent catalytic property to directly catalyze luminol chemiluminescence without extra oxidants. We utilized Fe 3 O 4 /MIL-101(Fe) to develop a ultra-sensitive quantitative analytical method for H 2 O 2 and glucose. The possible mechanism of the chemiluminescence reaction had been investigated. Under optimal conditions, the relative chemiluminescence intensity was linearly proportional to the logarithm of H 2 O 2 concentration in the range of 5–150 nM with a limit of detection of 3.7 nM (signal-to-noise ratio = 3), and glucose could be linearly detected in the range from 5 to 100 nM and the detection limit was 4.9 nM (signal-to-noise ratio = 3). Furthermore, the present approach was successfully applied to quantitative determination of H 2 O 2 in medical disinfectant and glucose in human serum samples.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Qingmin Hu,Sen Wang,Zhe Gao,Yunqin Li,Qian Zhang,Qun Xiang,Yong Qin
The decoration of noble metal-based catalysts with metal oxides can improve their catalytic performance for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol (COL) due to the interaction between the noble metal and metal oxides. Here, we used atomic layer deposition (ALD) to decorate Pt nanoparticles precisely with Fe oxides. The selectivity to COL increased from 45% for the bare Pt catalyst to 84% for the Pt-based catalyst after 30 cycles of decoration with Fe oxide by ALD. A series of characterizations demonstrated that the precise blocking of low coordinated Pt sites with Fe oxide by ALD, generating Pt-FeO x interfacial perimeter sites, and the interaction between the Pt nanoparticles and Fe oxide led to high selectivity to COL. This precise decoration and the formation of interfacial perimeter sites by ALD provide a promising route for the design of advanced catalysts.
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APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Yunxia Zhu,Yuming Zhou,Tao Zhang,Man He,Yongjuan Wang,Xiaoming Yang,Yong Yang
Lactate-intercalated Co–Fe layered double hydroxides (LDHs) were successfully prepared by coprecipitation and hydrothermal method. In this process, divalent metal ions as precursors can be obtained from the reduction reaction of lactic acid and metal powder (cobalt and ferrous). In order to obtain Fe 3+ , H 2 O 2 (30%) was used to oxidize Fe 2+ . Meanwhile, the produced lactate was intercalated into the LDHs interlayers to compensate the positively charged layers. The as-synthesized LDHs were studied by element chemical analysis, powder X-ray diffraction (XRD), FT-IR spectroscopy, thermogravitry (TG) and differential scanning calorimetry (DSC), TEM. The results indicated that the basal spacing value of the LDHs was larger than that of lactate-intercalated Mg–Al or Zn–Al LDHs. It proved that the lactate anions were inserted into the gallery in the form of dimers which made it easy to be delaminated in water. The obtained nanosheets were deposited on the substrates to form the film which was characterized by TEM and AFM, and infrared emissivity value (8–14 μm) was also investigated. The infrared emissivity values of Co–Fe LDHs were lower than that of Zn–Al which took advantage of the special electronic structure in Co and Fe. Besides, the orderly structure and the reduction of the interfacial deficiency of the film made the values further reduced.
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Analytical Methods
·
2015
·Vol. 7
·期 12
·4939-4946
·
IF 1.821
Huan Wang,Si-Yao Liu,Xiao-Jun Lv,Rui Ma,Zhi-Qi Zhang
Unique ternary single core–double shell structured magnetic microspheres of Fe3O4@SiO2@Fe–pamoate were successfully fabricated via a step-by-step assembly strategy. The procedures involved initial pre-treatment of silica-coated magnetic cores with carboxyl groups to functionalize the magnetic microspheres, and subsequent alternating treatments with Fe3+ and pamoic acid solutions for the growth of Fe–pamoate complexes on the microsphere surface to form Fe3O4@SiO2@Fe–pamoate magnetic microspheres. Characterization using various techniques demonstrated that the microspheres were porous, thermally stable, and possessed a single core–double shell sandwich structure. The as-synthesized materials possessed a bifunctional character derived from the magnetic properties of Fe3O4 nanoparticles and the high porosity of Fe–pamoate, making them excellent candidates as adsorbents for the magnetic enrichment of trace analytes. The potential applicability of the microspheres was demonstrated by preconcentrating sulfonamide antibiotics from environmental water samples prior to high-performance liquid chromatography analysis. The method combining enrichment with high-performance liquid chromatography had higher precision (relative standard deviations 1.4–12.3%), lower detection limits (0.08–0.12 ng mL−1), and good linearity (correlation coefficients higher than 0.9947) for five sulfonamide antibiotics investigated. Average recoveries at three spiked levels were in the range of 86.3 to 99.7% with relative standard deviations below 12.3%.
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ACS Catalysis
·
2014
·
IF 7.572
Mei-Qing Wang,Wei-Hua Yang,Hong-Hui Wang,Chi Chen,Zhi-You Zhou,Shi-Gang Sun
Aimed at developing a highly active and stable non-precious metal catalyst (NPMC) for oxygen reduction reaction (ORR) in acidic proton-exchange membrane fuel cells (PEMFCs), a novel NPMC was prepared by pyrolyzing a composite of carbon-supported Fe-doped graphitic carbon nitride (Fe–g-C3N4@C) above 700 °C. In this paper, the influence of the pyrolysis temperature and Fe content on ORR performance was investigated. Rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) studies reveal that, with a half-wave potential of 0.75 V [versus reversible hydrogen electrode (RHE)] and a H2O2 yield of 2.6% at 0.4 V, the as-synthesized catalyst heat-treated at 750 °C with a Fe salt/dicyandiamide (DCD) mass ratio of 10% displays the optimal ORR activity and selectivity. Furthermore, the pyrolyzed Fe–N–C composite exhibits superior durability in comparison to that of commercial 20 wt % Pt/C in acidic medium, making it a good candidate for an ORR electrocatalyst in PEMFCs.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2014
·
IF 3.679
Sheng-jie Xia,Xiao-bo Zhou,Wei Shi,Guo-xiang Pan,Zhe-ming Ni
Three transition metal oxides (Fe 3 O 4 , CeO 2 and SnO 2 ) modified Zn/Ti–layered double hydroxides (LDHs) were successfully synthesized. These materials were characterized by powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), Brunauer–Emmett–Teller (BET) and UV–vis diffuse reflectance spectrum (UV–vis) for the purpose of confirming the formation of good crystal structure. Comparing with original layered double hydroxides, the transition metal oxides modified Zn/Ti layered double hydroxide materials show narrower band gap, larger surface area, smaller pore volume, pore size distribution, and higher removal efficiency for acid red 14 under visible light. The decomposition efficiency of acid red 14 was all over 92% after 120 min. In addition, the thermal regeneration for re-use of layered double hydroxide materials after photodegradation was feasible for at least four cycles (degradation amount still all over 80%). Furthermore, the kinetic parameters, intermediates and possible photocatalytic pathways for acid red 14 decomposed by these transition metal oxides modified Zn/Ti layered double hydroxide materials were also investigated carefully.
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Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 20
·4146-4154
·
IF 4.726
Ruizhong Zhang,Shuijian He,Chunmei Zhang,Wei Chen
In this study, a simple and one-pot pyrolysis strategy is developed for the mass production of Fe, N-incorporated carbon nanotubes in situ grown on 3D porous carbon foam (denoted as Fe–Phen–CFs), which provides highly active Fe–N and doped-N species, and a large surface area with exposed active sites. The obtained composite exhibits intrinsic peroxidase-like catalytic activities. With the Fe–Phen–CFs as the catalyst, the peroxidase substrate of terephthalic acid (TA) can be oxidized to the fluorescent product of hydroxyterephthalate (HTA) by H2O2, which provides a unique strategy for fluorescence detection of H2O2. With such a process, as low as 68 nM H2O2 could be detected with a linear range from 0.1 to 100 μM. Meanwhile, by integrating glucose oxidase on the Fe–Phen–CFs composite, sensitive detection of glucose is also achieved with a linear range from 0.5 to 200 μM and a limit of detection of 0.19 μM. Most importantly, such a novel TA/Fe–Phen–CFs system can be successfully applied to glucose determination in real human serum samples. The unique nature and 3D structure of the Fe–Phen–CFs composite makes it promising for the fabrication of low-cost, high-performance biosensors.
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ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 27
·1700886
·
IF 12.124
Yecan Pi,Qi Shao,Pengtang Wang,Jun Guo,Xiaoqing Huang
The development of bifunctional electrocatalysts for overall water splitting in acidic media is vital for polymer electrolyte membrane (PEM) electrolyzers, but still full of obstacles. Here, highly efficient acidic overall water splitting is realized by utilizing ultrasmall, monodispersed Iridium (Ir)-based nanoclusters (NCs) as the candidate, via a surfactant-free, wet-chemical, and large-scalable strategy. Benefiting from the high specific surface area, clean surface, and strong binding between NCs and supports, the IrM NCs exhibit attractive activities and durability for both oxygen evolution reaction and hydrogen evolution reaction in acidic electrolytes, with IrNi NCs showing the best performance. More significantly, in the overall water splitting, IrNi NCs reach 10 mA cm −2 at a cell voltage of only 1.58 V in 0.5 m H 2 SO 4 electrolyte, holding promises for potential implementation of PEM water electrolysis. This work opens a new avenue toward designing bifunctional “acidic stable” catalysts for efficient overall water splitting.
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PROCESS BIOCHEMISTRY
·
2017
·
IF 2.497
Hui Zhang,Mengya Li,Jie Li,Guangli Wang,Feng Li,Minghua Xiong
Nitrile hydratase (NHase) has attracted substantial attention for industrial applications to produce large-scale amides. Several NHases have been investigated for functional expression in Escherichia coli ( E. coli ). A Fe-type NHase was obtained from an acetamiprid-degrading bacterium, Pseudoxanthomonas sp. AAP-7 and functionally expressed in E. coli BL21 (DE3). No significant NHase activity was detected from the E. coli expressing either the NHase gene alone or NHase and P46K genes transcribed as one unit. Purified recombinant NHase, co-expressed with P46K on two separate plasmids, exhibited the maximal enzyme activity. Furthermore, a GST tag attached to the N-terminus of α subunit resulted in a slight increase in the solubility and stability of NHase compared with a His tag at the C-terminus of β subunit. When co-expressed with the chaperones GroEL-GroES, the yield of the soluble recombinant NHase was improved substantially, while a small decrease in NHase activity was observed. The putative activator P46K was strictly required for production of the recombinant NHase for full enzyme activity, although the chaperones GroEL-GroES appeared to assist NHase to fold properly. This study of the expression of a fully active Fe-type NHase would provide another example to enhance our understanding of NHase biosynthesis.
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RSC Advances
·
2015
·Vol. 5
·期 82
·67031-67040
·
IF 3.84
Z. Y. Wu,X. A. Fan,G. Q. Li,J. Wang,Z. H. Gan
Core–shell structured Fe-6.5 wt% Si/SiO2 particles and intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts with tunable insulating layer thickness were prepared by in situ chemical deposition combined with a subsequent spark plasma sintering process. Most of conductive Fe-6.5 wt% Si alloy particles were coated with a SiO2 insulating layer in the Fe-6.5 wt% Si/SiO2 composite compacts. The SiO2 insulating layer could increase the electrical resistivity and reduce the effective radius of the eddy current in Fe-6.5 wt% Si/SiO2 composite compacts. Therefore, the intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts presented lower core loss than those of Fe-6.5 wt% Si compacts without SiO2 insulating layer. Based on this, several types of Fe-6.5 wt% Si/SiO2 core–shell particles and intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts (with various SiO2 insulating layer thicknesses) were selectively prepared by simply varying the TEOS concentration (the volume of TEOS for each gram of Fe-6.5 wt% Si particles, ml g−1). The results indicated that the thickness of the SiO2 layer and electrical resistivity of Fe-6.5 wt% Si/SiO2 composite compacts increased with increasing the TEOS concentration from 0.1 to 0.4 ml g−1, while saturation magnetization, relative permeability and core loss displayed the reverse tendencies. The as-prepared intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts exhibited excellent magnetic properties, which inspire us to develop new high silicon containing soft magnetic cores which can be widely used in various electromagnetic devices.
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