ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 31
·31358-31367
·
IF 2.8
Wan Zhong,Wang Jianlong
The advanced treatment of municipal secondary effluent by heterogeneous and homogeneous Fenton processes using Fe/Ce-RGO (reduced graphene oxide) and Fe 2+ as catalysts was studied and compared. Sulfamethazine (SMT) was spiked in the effluent to examine the effectiveness of the emerging contaminant removal. The Fe/Ce-RGO catalyst was characterized using a scanning electron microscope (SEM) and cycle voltammetry curves. The removal of dissolved organic carbon (DOC), soluble chemical oxygen demand (SCOD), SMT, and ultraviolet-visible spectroscopy in 254 nm (UV 254 ) of municipal secondary effluents was examined. The DOC removal efficiency of secondary effluent (without addition of SMT) was 36.30% and 11.74% using Fe/Ce-RGO and Fe 2+ as catalysts, respectively. The removal efficiency of DOC, SCOD, and SMT in heterogeneous Fenton process was higher than that in homogeneous Fenton process. The changes of three-dimensional excitation-emission matrix (3DEEM) fluorescence, soluble microbial products (SMPs), humic acids, and UV 254 were determined, and the results indicated that UV 254, aromatic proteins, and humic acids decreased rapidly in both processes; however, polysaccharides and protein-like substances were difficult to degrade. Although some toxic substances produced after Fenton-like treatment, the biodegradability of the treated effluent was enhanced.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yanying Wang,Zhaoyi Zhang,Xin Liu,Fang Ding,Ping Zou,Xianxiang Wang,Qingbiao Zhao,Hanbing Rao
We developed a hydrothermal synthesis and high temperature calcination method to synthesize the metal–organic framework (MOF)-derived NiCo2O4/NiO and NiCo2O4/NiO-rGO. These composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunner–Emmet–Teller measurements. This work combines excellent catalytic efficiency of the transition metal with large specific surface area and large number of pores of the MOF. Consequently, catalysts for oxygen evolution with high efficiency and low cost were obtained. Both materials show lower overpotential at 430 and 350 mV, respectively, under 10 mA·cm–2. The Tafel slopes are 49 and 66 mV·dec–1, respectively, with very small performance attenuation for long-term catalytic reaction. Therefore, the catalysts reported herein possess great potential for application in oxygen evolution reaction.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 2
·1626-1636
·
IF 2.324
Li Yuexuan,Duan Yugang
Silicon coupling reagent is regarded as a common additive on surface treatment of polymer due to its high bonding strength and low cost. In this paper, a series of γ-(2, 3-epoxypropoxy) propyltrimethoxysilane (KH560)-based reduced graphene oxide (RGO)@Fe 3 O 4 (KH560/RGO@Fe 3 O 4 ) composites with different ratio of Fe 3 O 4 nanoparticles (NPs) are synthesized by a facile hydrothermal method. It is confirmed that the silicon reagent KH560, as a hopeful candidate for increasing the RGO lattice defects, is favorable to improve the electromagnetic wave absorption. Meanwhile, the microwave attenuation mechanism of KH560/RGO@Fe 3 O 4 composite suggests that the dielectric loss mainly causes by multiple Debye dipolar relaxation and its magnetic loss comes from the eddy-current effect of Fe 3 O 4 NPs over the high frequency range. In consequence, the KH560/RGO@Fe 3 O 4 composite endows the excellent absorption performance, the reflection loss (RL) value is optimized to − 25 dB at 14.1 GHz with a thickness of 3 mm and the maximum frequency bandwidth for RL < − 10 dB is 4.1 GHz with a thickness of 4 mm.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14007-14021
·
IF 2.195
Ahmed Arsalan,Jia Yunming,Huang Yi,Khoso Nazakat Ali,Deb Hridam,Fan Qinguo,Shao Jianzhong
We developed a high-performance electrically conductive and transparent PVDF-TrFE based electrode for piezoelectric pressures sensor using the electrospinning technique. The electrode was produced by depositing the reduced graphene oxide (rGO), multiwall carbon nanotubes (rGO-MCNTs) via spray coating. Various concentration of rGO and MCNTs were used and optimized for improved electrical performance of the resultant electrode. The deposition of poly (3,4-ethylenedioxythiophene) (PEDOT) was successfully achieved by using vapor phase polymerization (VPP). The morphological characteristics of the as-prepared hybrid composite nanofiber mats were analyzed by using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transforms infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (X-RD), and UV–visible spectroscopy. The electrical performance of the fabricated composite nanofibers was measured by using a four-point probe device. The results showed significant enhancement in electrical conductivity of the hybrid nanocomposite which increased up to 3916 S cm −1 and sensitivity of the developed pressure sensor was achieved 67.4 kPa −1 . This work suggests that the hybrid nanocomposite can be used for the transparent electrodes in a piezoelectric pressure sensor.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Hongli Shi,Ruiying Wang,Mengran Lou,Dianzeng Jia,Yong Guo,Xingchao Wang,Yudai Huang,Zhipeng Sun,Tao Wang,Luxiang Wang
A novel tri-component hybrid, Pt/pyridine ionic liquid polyoxometalate/reduced graphene oxide denoted as Pt/(epy) 3 PMo 12 O 40 /rGO with well-dispersed, smaller size Pt nanoparticles on rGO is successfully synthesized. The morphology, structure, composition and electrochemical property are characterized by high resolution transmission electron microscopy , X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive spectrometer, Raman spectra , thermogravimetric analysis and cyclic voltammetry , respectively. Ionic liquid polyoxometalate (epy) 3 PMo 12 O 40 availably prevents the aggregations of Pt nanoparticles on the rGO surface, furthermore, effectively improves anti CO poisoning performance and enhances the conductivity of the material. The mass activity of as-prepared Pt/(epy) 3 PMo 12 O 40 /rGO catalyst for methanol oxidation is about 10 times of 20% commercial platinum carbon, 7 times of Pt/rGO, 4 times of Pt/epyBr/rGO, and 2 times of Pt/H 3 PMo 12 O 40 /rGO. This further demonstrates that the ionic liquid polyoxometalate (epy) 3 PMo 12 O 40 play a very important role in enhancing the eletrocatalytic activity of the tri-component hybrid composite catalyst.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11261-11268
·
IF 7.443
Jing Li,Panpan Zhou,Feng Li,Ren Ren,Yang Liu,Jianrui Niu,Jianxin Ma,Xueyao Zhang,Min Tian,Jun Jin,Jiantai Ma
In the present work, nickel (Ni) and palladium (Pd) core–shell structure nanospheres with various thicknesses have been facilely obtained via a one-pot synthesis process. These hybrid structures allow us to correlate the Pd thickness with their performance in the hydrogen evolution reaction (HER). The HER activity increases with a decrease of the Pd thickness, and it can be ascribed to the enhancement of electron donation of Pd (111) caused by the electron flow from Ni (111) to Pd (111) based on first-principles calculations. In this hybrid system, the difference in work functions of Pd and Ni results in surface polarization on the Pd surface, tuning its charge state for hydrogen reduction. Meanwhile, with the assistance of a polyethyleneimine–reduced graphene oxide (PEI–rGO) support, the examined Ni@Pd4:1/PEI–rGO50:1 (10 wt%) electrocatalyst presents outstanding HER activity comparable with that of platinum (Pt). This work opens up possibilities for reducing Pd usage while achieving high HER performance.
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 2.467
Dong Yang,Xueyan Wang,Jiafu Shi,Xiaoli Wang,Shaohua Zhang,Pingping Han,Zhongyi Jiang
Herein, the reduced graphene oxide–Fe 3 O 4 (rGO–Fe 3 O 4 ) nanocomposites are synthesized by the simultaneous reduction of graphene oxide (GO) and in situ deposition of Fe 3 O 4 nanoparticles ( ca. 20 nm) enabled by Fe 2+ ions. The rGO–Fe 3 O 4 nanocomposites integrate the magnetic property of Fe 3 O 4 nanoparticles and the large specific surface area of rGO nanosheets. Catalase (CAT), as a commonly used enzyme, can be efficiently immobilized on the rGO–Fe 3 O 4 nanocomposites through physical adsorption. The CAT loading capacity is as high as 312.5 ± 12.6 mg g −1 , while the activity recovery of CAT can be high up to nearly 98%. The strong magnetic response of immobilized CAT ensures its easy separation from the reaction system when an external magnetic field is applied. Owing to the hydrophobic and hydrogen bonding interactions between enzyme and the support, the immobilized CAT exhibits zero leaching, desirable stability and excellent reusability.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Rong Wang,Yi Xu,Chunyan Wang,Huazhou Zhao,Renjie Wang,Xin Liao,Li Chen,Gang Chen
A novel composite structure of reduced graphene oxide (rGO)–Ag nanoparticles (Ag NPs) nanocomposite, which was integrated on the indium tin oxide (ITO) glass by a facile and rapid two-step chronoamperometry electrodeposition route, was proposed and developed in this paper. SERS-activity of the rGO/Ag NPs nanocomposite was mainly affected by the structure and size of the fabricated rGO/Ag NPs nanocomposite. In the experiments, the operational conditions of electrodeposition process were studied in details. The electrodeposited time was the important controllable factor, which decided the particle size and surface coverage of the deposited Ag NPs on ITO glass. Under the optimized conditions, the detection limit for rhodamine6G (R6G) was as low as 10 −11 M and the Raman enhancement factor was as large as 5.9 × 10 8 , which was 24 times higher than that for the ITO–Ag NPs substrate. Apart from this higher enhancement effect, it was also illustrated that extremely good uniformity and reproducibility with low standard deviation could be obtained by the prepared ITO-rGO/Ag NPs nanocomposite for SRES detection.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Mingjun Zhou,Donglai Han,Xinlin Liu,Changchang Ma,Huiqin Wang,Yanfeng Tang,Pengwei Huo,Weidong Shi,Yongsheng Yan,Jinghai Yang
Quantum dots (QDs) CdSe exhibits relatively high photocatalytic abilities for its unique properties, but the aggregation and photocorrosion have blocked its further application. Therefore, for arriving at a solution, alkaline earth metal ions (M = Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ ) and reduced graphene oxide (rGO) are chosen to fabricated new QDs CdSe-based photocatalytic systems. In this paper, M@CdSe/rGO composites have been synthesized via a facile one-step hydrothermal approach, during which the formation of M doped CdSe crystallization and GO reduction occur simultaneously. The obtained photocatalysts demonstrates synergistically enhanced visible light photocatalytic activity and stability toward photodegrading tetracycline hydrochloride (TC-HCl) solution, especially the introduction of 6 mol% Ca 2+ and 5 wt% GO on QDs CdSe resulted in 85.6% degradation of 15 mg/L TC-HCl in 1 h with 0.5 g/L catalyst. Furthermore, the photodegradation mechanism was systematically investigated by active species trapping experiment. It revealed that h + was the major active species in the destructions process. And the possible process of charge transfer for Ca 2+ @CdSe/rGO nanocomposite was proposed based on the experimental results.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Yong Luo,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Well dispersed Fe 3 O 4 nanoparticle suspensions with grain size of about 9 nm were coprecipitated and then compounded with different amount of GO (graphite oxide) followed by reduction of GO to obtain Fe 3 O 4 /rGO (reduced graphite oxide) composites with different component ratios. The as-obtained Fe 3 O 4 /rGO composites were used as anode materials for lithium ion batteries to investigate the best component ratio of the composite for the cycling performance. Fe 3 O 4 /rGO composite electrode containing 44.9 wt% Fe 3 O 4 displayed the best cycling capacity of above 300 mA h g −1 at 1000 mA g −1 after 100 cycles and it was interesting to find that the trend of impedance spectra of Fe 3 O 4 /rGO electrodes after some cycles of electrochemical reactions can be well related to the overall cycling performances.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Bangrun Wang,Zhaoyin Wen,Jun Jin,Xiaoheng Hong,Sanpei Zhang,Kun Rui
Germanium is considered as a promising anode material for lithium ion batteries (LIBs) due to its high-capacity. However, owing to the huge volume variation during cycling, the batteries based on germanium anodes usually show poor cyclability and inferior rate capability. Herein, we demonstrated a novel strategy to uniformly anchor the core-shell structured germanium@carbon (Ge@C) on the reduced graphene oxide (rGO) nanosheets by the strong adhesion of dopamine. In the resulting Ge@C/rGO hybrid, the amorphous carbon layer and rGO nanosheets can effectively reduce the agglomeration of germanium and provide buffer matrix for the volume change in electrochemical lithium reactions. When used as anode materials for LIBs, Ge@C/rGO hybrids deliver a reversible capacity of 1074.4 mA h g −1 at 2C after 600 cycles (with capacity retention of 96.5%) and high rate capability of 436 mA h g −1 at 20C after 200 cycles. The encouraging electrochemical performance clearly demonstrates that Ge@C/rGO hybrids could be a potential anode material with high capacity, excellent rate capability, and good cycling stability for LIBs.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yaoguang Wang,Yulan Wang,Dan Wu,Hongmin Ma,Yong Zhang,Dawei Fan,Xuehui Pang,Bin Du,Qin Wei
In this work, a label-free electrochemical immunosensor was developed for the quantitative detection of carcinoembryonic antigen (CEA). Flower-like Ag/MoS 2 /rGO nanocomposites were employed as the signal amplification platform of the designed immunosensor for the first time. Due to the synergistic effect between molybdenum disulfide (MoS 2 ), reduced graphene oxide (rGO) and Ag nanoparticles (NPs), Ag/MoS 2 /rGO nanocomposites could provide a high sensitivity for the label-free electrochemical immunosensor. The detection mechanism was based on the monitoring of the electrocatalytic current response change towards the reduction of hydrogen peroxide (H 2 O 2 ) when immunoreaction occurred on the surface of the electrode modified with Ag/MoS 2 /rGO nanocomposites. Using amperometric i-t curve to record the electrocatalytic process, the proposed immunosensor achieved an ultrasensitive and specific detection of CEA with a low detection limit of 1.6 fg/mL. Under optimal conditions, the fabricated immunosensor exhibited acceptable reproducibility, selectivity and excellent stability. This designed immunosensor could provide an effective method in the clinical diagnosis of other tumor markers.
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高影响因子
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