Biomolecules
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2019
·Vol. 9
·期 6
·245
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IF 4.694
Jun Liu,Shuai Dong,Quanguo He,Suchun Yang,Mei Xie,Peihong Deng,Yonghui Xia,Guangli Li
In this study, we reported facile synthesis of Fe3O4/C composite and its application for the cost-effective and sensitive determination of tryptophan (Trp) in human serum samples. Fe3O4/C composites were prepared by a simple one-pot hydrothermal method followed by a mild calcination procedure, using FeCl3∙6H2O as Fe3O4precursor, and glucose as reducing agent and carbon source simultaneously. The Fe3O4/C composite modified glassy carbon electrode (Fe3O4/C/GCE) was prepared by drop-casting method. The microstructure and morphology of Fe3O4/C composite was characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Due to large specific surface area and synergistic effect from Fe3O4nanoparticles and carbon coating, Fe3O4/C composite showed excellent electrocatalytic activity toward the oxidation of Trp. As a result, the proposed Fe3O4/C/GCE displayed superior analytical performances toward Trp determination, with two wide detection ranges (1.0–80 μM and 80–800 μM) and a low detection limit (0.26 μM, S/N = 3). Moreover, successful detection of Trp in human serum samples further validate the practicability of the proposed sensor.Keywords:Fe3O4/C composite;tryptophan;voltammetric detection;second derivative linear scan voltammetry
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 41
·14767-14773
·
IF 4.099
Sisi Dai,Bin Quan,Baoshan Zhang,Xiaohui Liang,Guangbin Ji
In this work, novel one-dimensional (1D) Mo2C/Co@C nanorods (MCRs), using a metal–organic framework (zeolitic imidazolate framework; ZIF-67) as the coating layer to form multi-interfaces, were formed via a facile hard template method. Compared with previous works relating to porous-carbon-based Mo2C nanocomposites, the well-designed MCRs in this study possess a double attenuation mechanism due to the existence of the dielectric materials Mo2C and remaining carbon (RC) and the magnetic compound Co. Thanks to a new design and the multiple useful compounds, the as-prepared MCRs have the features of demonstrating multi-interfacial polarization, a large surface area and highly isotropic dissipation. Hence, the samples not only inherit the excellent microwave absorbing abilities of Mo2C but they also have a broadened effective bandwidth. For example, the minimum reflection loss (RL) value of MCRs with 35% sample loading could reach −47.98 dB. More importantly, RL values of less than −10 dB can be observed from 11.08 to 17.08 GHz (an effective bandwidth of 6.0 GHz) with a matching thickness of 1.6 mm, which is much better than previous work involving porous-carbon-based Mo2C nanocomposites. Firstly, we have reasonably redesigned the samples to have good absorbing properties for practical applications. Secondly, we have paved a highly efficient and universal way to synthesize 1D microwave absorbers with multiple valuable interfaces.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jizhi Zhou,Pei Liu,Zeyuan Liu,Jia Zhang,Xin Huang
The recovery of phosphorus (P) from wastewater has attracted substantial attention with the atrophy of global P resource. In the current work, the simultaneous recovery of P with the removal of nickel (Ni) via iron/activated carbon (Fe/AC) and hydrogen peroxide (H 2 O 2 ) form nickel-plating wastewater was achieved. The isotherm reaction showed a maximum P recovery of 99.99% with an equilibrium concentration of P of 0.12 mg/L, which was lower than the limitation of discharge regulation (China national regulation, 0.5 mg/L). The optimal conditions for P recovery were 0.25 mol/L H 2 O 2 , a Fe/AC mass ratio of 1:1, an at 60 °C, which led to the ratio of P in the form of FePO 4 in the residue to be 77%. Moreover, the Fe/AC microelectrolysis coupling to H 2 O 2 promoted Fe 2+ production from Fe 0 and improved the circulation of Fe 2+ , which improved the production of hydroxyl radicals with increasing pH and consequently enhanced oxidation efficiency of hypophosphite. The FePO 4 was found the major form of phosphate in the precipitate. The highest removal rate of nickel was 89%, which was attributed to its precipitation at high pH and adsorption on to iron hydroxides and activated carbon. Nickel purification was achieved by further coagulation as the equilibrium concentration of Ni was lower than 0.1 mg/L. Therefore, our work provides a promising approach for simultaneous recovery of P and removal of Ni from electroplating wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Hao Guo,Taotao Sun,Liguo Yue,Ning Wu,Qi Li,Wenqing Yao,Wenhu Yang,Wu Yang
As a kind of energy storage device, supercapacitors have attracted the attention of researchers, and the development of high-performance electrode materials is also the focus of attention. In this paper, template synthesis and pyrolysis were combined to prepare high performance porous carbon electrode materials. The carbonized electrode material effectively increased the capacitance storage capacity and charge transfer rate. The results revealed that the derivative had a relatively low charge-transfer resistance and high specific capacitance of 1059 F·g −1 at a current density of 1.0 A·g −1 in a three-electrode system. To further exploring practical application, a device based on the derivative and hemp-activated carbon asymmetric supercapacitor was assembled in 0.1 M Na 2 SO 4 neutral electrolyte, which exhibited an energy density of 20.35 Wh·kg −1 at a power density of 400 W·kg −1 . Interestingly, it showed capability retention of nearly of 91.7% and columbic efficiency of 100% even after 10000 charging/discharging cycles in the neutral electrolyte.
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ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Xia Jiang,Yang Liu,Haijiao Hao,Yan Xu,Jiale Huang,Daohua Sun,Qingbiao Li
Herein, we described a mild and facile method for the synthesis of three-dimensional (3D) hierarchically porous TiO2. This method simultaneously realized the C,N self-dopant, introduced more surface defectives, and decreased in the band-gap energy (Eg) of TiO2. Rape pollen was chosen as the biotemplate to prepare TiO2, and the pore property of the obtained products could be adjusted by changing the amount of Ti precursor and calcination temperature. The as-synthesized pollen-TiO2 not only duplicated the morphology of rape pollen, but also showed enhanced 1-butene selectivity in the reaction of selective hydrogenation of 1,3-butadiene after loading elemental Pd, when comparing with the commercial TiO2. Butenes selectivity of 98% and 1-butene selectivity of 66% were achieved at 50 °C, because of the hierarchically porous structure of pollen-TiO2 and the lower Eg and more surface defects resulting from the C,N dopant.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 85
·期 1
·140-148
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IF 1.575
Guo Xingzhong,Yin Pengan,Wang Zichen,Yang Hui
Abstract Porous MoS 2 /C nanocomposites have been successfully via a sol–gel route with ammonium molybdatetetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O) as molybdenum source, glucose as carbon source and tetramethyloxysilane (TMOS) as gelation accelerator, subsequently followed by high-temperature sulfuration and further NaOH etching to remove silica template derived from TMOS. The as-prepared MoS 2 /C nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption–desorption, and the effect of molybdenum precursor mass on the synthesis of product was also investigated. The Mo and TMOS mass ratio obviously affects the gelation time, phase composition and morphology of the resultant product, and an appropriate Mo and TMOS mass ratio allows the formation of lamellar structure as well as perfect MoS 2 phase. The as-prepared MoS 2 /C nanocomposite with Mo and TMOS mass ratio of 7:3 exhibits a BET surface area of 31 m 2 g −1 and a mesopore size of 20 nm, and demonstrates good electrochemical performances with 400 mA h g −1 specific reversible capacity after 60 cycles owing to the pore structure and synergistic effect between MoS 2 and amorphous carbon. Graphical abstract
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高影响因子
SYNTHETIC METALS
·
2017
·
IF 2.435
Binghu Wang,Wensheng Tan,Renjun Fu,Huihui Mao,Yong Kong,Yong Qin,Yongxin Tao
Hierarchical mesoporous Co 3 O 4 /C@MoS 2 core-shell structured materials are synthesized via a two-step calcination and a solvothermal method using cobalt metal-organic frameworks (cobalt-MOFs, ZIF-67) and (NH 4 ) 2 MoS 4 as the precursors of Co 3 O 4 /C and MoS 2 , respectively, which is a new class of core-shell materials as supercapacitor electrode materials. The obtained Co 3 O 4 /C@MoS 2 exhibits high specific capacitance (1076 F g −1 at 1 A g −1 ), rate capability (76.9% capacitance retention at 10 A g −1 ) and cyclic stability (64.5% capacitance retention after 5000 cycles at 10 A g −1 ). Moreover, the content of MoS 2 greatly influences the electrochemical performances of the obtained core-shell materials. The results demonstrate that the as-synthesized ZIF-67 can be used as a promising candidate for designing Co 3 O 4 based core-shell materials used in supercapacitors.
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Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Fu He,Yong Ji,Yang Wang,Yun Zhang
Nanoscale zerovalent iron (nZVI) loaded magnetic hollow mesoporous bimetallic Fenton-like catalyst, Fe 0 @C@MnFe 2 O 4 , was prepared by a one-pot solvothermal method. Carbon shell of polydopamine (PDA) was formed through self-oxidation of dopamine by adding MnFe 2 O 4 hollow spheres into dopamine solutions. Then Fe 2+ ions were adsorbed on the surface of PDA@MnFe 2 O 4 to obtain active nZVI in-situ through subsequent calcinations. Thus, the mesoporous carbon shell of Fe 0 @C@MnFe 2 O 4 had a great contribution to high adsorption capacity for concentrating TBBPA around the catalyst. The high concentration of TBBPA outside would further facilitate the transportation to the inside of the hollow catalyst to achieve a high catalytic efficiency. Fe 0 @C@MnFe 2 O 4 , as an integrated adsorbent-catalyst, was used to remove Tetrabromobisphenol A (TBBPA) in aqueous solution with the presence of H 2 O 2 and NH 2 OH. Over 90% of TBBPA can be removed within 120 min. According to the result of ESI–MS, β -scission and debromination were involved in the degradation of TBBPA. The reused catalyst could be easily separated by using an external magnetic field in seconds. After ten cycles, the catalyst was still of good activity. The excellent removal efficiency of TBBPA might be attributed to the synergistic effect from high adsorption capacity and efficient Fenton-like catalytic reaction of Fe 0 @C@MnFe 2 O 4 .
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RSC Advances
·
2017
·Vol. 7
·期 82
·51831-51837
·
IF 3.108
Yunrui Zhang,Haihong Niu,Xiangjie Zhang,Junxiu Pan,Yang Dong,Haijun Wang,Yongjun Gao
A kind of magnetic N-containing carbon material was synthesized by a simple method using sustainable N-acetyl-D-glucosamine (NAG) and iron nitrate as the raw materials. In C–H oxidation reactions such as the epoxidation of stilbene and styrene, and the oxidation of ethylbenzene, the carbon catalyst exhibited excellent catalytic activity and selectivity for the target products. The superparamagnetic properties at room temperature facilitated catalyst recycling and reusability when it was used as a catalyst. The relationship between the catalytic results and the N 1s XPS analysis indicated that the graphitic N species located in the carbon skeleton was the key accelerating factor which promoted the catalytic C–H oxidation. Density functional theory (DFT) calculations further indicated that the iron species were not an essential factor but they acted as promoters for the catalytic performance of the catalyst. This study will expand the application of biomass-based heteroatom-containing compounds.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiaowei Ma,Lin Tan,Jiaqi Xu,Jiaoyang Hao
Metal–organic frameworks (MOFs) exhibit highly adjustable porosity, structure, and versatility, properties that render them promising for electromagnetic wave (EMW) absorption applications. However, the impedance matching of these composites is poor in practical applications, thereby compromising their EMW absorption performance. In this study, a novel EMW absorbing composite was synthesized by a solution-thermal method combined with a subsequent pyrolysis process. Specifically, we introduced heteroatom (N and S) codoped graphene (N, S-Gr) into the Co–Ni MOF, forming N, S-Gr/CoNi/C. Graphene was endowed with abundant defect and disorder sites through the codoping of nitrogen and sulfur, which enhanced interfacial polarization and dipole polarization. When nickel and cobalt were added in a 1:1 ratio, the minimum reflection loss (RLmin) of the N, S-Gr/Co–Ni/C composite reached −47.7 dB at 4.24 GHz, and the resultant material exhibited the best absorption properties. As a result, this composite is considered to be an ideal candidate for the development of highly effective EMW absorbers.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Guanzheng Wang,Huazhi Lei,Zhong Liu,Zhentao Yuan,Lu Li,Zhaolin Zhan,Xiao Wang
Although GeO 2 exhibites a large theoretical capacity (2125 mAh g −1 ), its large volume change limits its wide application in anode materials. A novel oxygen-deficient and amorphous Ge/GeO 2 /C composite anode consisted of crystal Ge was synthesized in situ using hydrothermal methods and reductive sintering to improve the specific capacity and long life of GeO 2 -based anodes. The capacity of the Ge/GeO 2 /C anode is 1160 mAh g −1 at 0.2 A g −1 for 200 cycles. The reversible specific capacity is retained at 1004 mAh g −1 at A g −1 for 600 cycles, thereby showing excellent stability. The presence of rich oxygen vacancies and crystalline Ge can assist the reversible decomposition of amorphous GeO 2 to improve the ionic and electronic conductivity of the anode. In addition, a stable and uniform film thickness of ∼20 nm is formed at the Ge/GeO 2 /C electrode surfaces after down cycling 200 times, as observed by transmission electron microscopy. These excellent properties are due to the carbon composite, amorphous structure and high oxygen vacancy concentration of the anode and the synergistic effect by crystalline Ge.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jie Ni,Tao Liu,Qianzhi Shi,Mengjiao Zhu,Xudong Wang,Lina Kang,Zhenyu Chu,Biao Xu,Wanqin Jin
Interleukin-6 (IL-6) is an essential serum biomarker in the diagnosis of the septic cardiomyopathy, which causes acute shock to increase the fatality rate of patients to about 80 %. However, due to the time-consuming nature of current clinical assay techniques, the on-site and rapid test of IL-6 during the surgery and emergencies remains a major challenge to save lives. In this work, we proposed an ultrasensitive electrochemical immunosensor to rapidly determine serum IL-6 within just 20 min, relying on the hollow carbon coated NiCo alloy nanocubes (NiCo@C). This NiCo@C architecture is derived from a Prussian blue analogue through a controlled pyrolysis process, which facilitates the in-situ reduction of the NiCo alloy inside the cavity while preserving the nanocubic carbon skeleton. This unique structure offers outstanding electrocatalysis and conductivity for the generation and amplification of the immune signal, as well as provides abundant binding domains for the immobilization of antibody. The resulting IL-6 immunosensor demonstrates a wide detection range from 0.1 pg/mL to 100 ng/mL and an ultralow detection limit of 0.03 pg/mL, as well as high reliability for assay and dynamic monitoring in human serum samples. This immunosensor will show tremendous potentials for the early-warning and monitoring of patients' vital signs in emergency settings.
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