PLASMA SCIENCE & TECHNOLOGY
·
2021
·Vol. 23
·期 11
·115503
·
IF 1.567
Xinghao LIU,Cheng CHENG,Zimu XU,Shuheng HU,Jie SHEN,Yan LAN,Paul K CHU
Tetracycline (TC) is an antibiotic mainly used in livestock production and respiratory infection. Traditional methods are not effective in removing TC from solution. In this study, TC was degraded by gas–liquid plasma in the presence of rGO-TiO2 in solution. The rGO-TiO2 was prepared by modified hummers and hydrothermal method. The electrical and optical properties of the gas–liquid discharge plasma were studied and the produced long-lived reactive species were analyzed by spectrophotometer. The degradation efficiency of TC was improved by 41.4% after plasma treatment for 12 min in presence of 30 mg l−1 rGO-TiO2 compared to that with plasma alone. The degradation efficiency increased with increasing discharge power, but as the initial concentration was increased from 20 to 80 mg l−1, the degradation efficiency of TC decreased. The initial pH had no significant effect on the degradation of TC. The intermediate products were determined by UV–vis spectrophotometry and ESI (+)–MS, and the degradation mechanism was analyzed. The reactive species, including O3, ·OH, and H2O2, etc., produced in the plasma/catalyst system attracted electron-rich functional groups (amino group, aromatic ring, and double bond). Therefore, the gas–liquid plasma/catalyst system could be an effective and promising method for pharmaceutical wastewater treatment in future.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiaoqing Zhao,Jing Wang,Hou Chen,Hui Xu,Liangjiu Bai,Wenxiang Wang,Huawei Yang,Donglei Wei,Baiqing Yuan
A novel electrochemical immunoassay platform for multi-signal amplification has been constructed and applied to the simultaneous detection of three tumor markers (TMs). The platform was successfully developed by polyethyleneimine (PEI)-polydopamine (PDA)/reduced graphene oxide (rGO) nanocomposites. PDA/rGO as the substrates can simultaneously load with detection antibodies (Ab 2 ) and large amounts of PEI, which PEI were further used to immobilize different signal labels. Three TMs of carcinoembryonic antigen (CEA), prostate specific antigen (PSA) and alpha fetoprotein (AFP) were employed as potential factors. Ferrocenecarboxylic acid (Fc), anthraquinone-2-carboxylic acid (Aq) and acetylsalicylic acid (ASA) were employed as distinguishable signal labels. Electrochemical responses of designed sandwich-type immunosensor were successfully investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The multiplexed immunoassay displayed excellent linear response in the range of 0.102 pg/mL–112 ng/mL for CEA and PSA, 0.117 pg/mL–117 ng/mL for AFP. The detection limit of three TMs were 91 fg/mL, 101 fg/mL and 83 fg/mL for CEA, PSA and AFP, respectively. Moreover, this electrochemical immunoassay platform exhibited excellent reproducibility, sensitivity and selectivity for the simultaneous detection of multiple biomarkers.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Huan Wang,Zicheng Xiao,Zhifeng Yu,Yuntian Ma,Pingfan Wu,Fumin Xue,Wei Guo,Wangda Lu,Xinxin Jiao,Peng Jiang,Minghui Liang
To develop iron-based materials for energy storage is an important issue because of their low cost, abundant storage and high theoretical specific capacitances. Fe(OH) 3 colloids stabilized by FeCl 3 are used as the precursor to fabricate with carbon from glucose and graphene oxide (GO) to prepare superparamagnetic iron oxide/carbon/rGO (reduced graphene oxide) composite for enhanced energy storage performance. Glucose or graphene oxide cannot avoid the aggregation of iron oxides when they are used separately; however, the simultaneous addition of glucose and graphene oxide can supress the aggregation of iron oxide nanoparticles , which is beneficial for energy storage. The characterization results of Fe 2 O 3 -based composites, including XRD , TEM and XPS , reveal that iron oxide nanocrystals in the composites are γ-Fe 2 O 3 . The simultaneous utilization of GO and glucose leads to higher saturation magnetizations of iron oxide than GO or glucose does, and the saturation magnetization of iron oxide in the iron oxide/carbon/rGO composite can be up to 83 emu g −1 . More importantly, the iron oxide/carbon/rGO composites have much higher energy storage performance than that of iron oxide/carbon or iron oxide/rGO samples. The specific capacitance of the composites can reach 400 F g −1 and the retention can remain 92% after 2500 cycles.
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BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Mei Wu,Yuxiao Yang,Kaihang Cao,Chulei Zhao,Xiuwen Qiao,Chenglin Hong
In this study, a novel signal-amplified immunosensor was designed by using a microwave-assisted self-assembly method to synthesize ZnFe 2 O 4 -Ag/rGO nanocomposites. The conductivity of ZnFe 2 O 4 -rGO nanocomposites was significantly improved due to the effective inhibition of rGO accumulation by the insertion of ZnFe 2 O 4 and Ag nanoparticles (NPs) into graphene sheets. Excellent sensitivity and reproducibility were achieved through the microwave-assisted preparation of ZnFe 2 O 4 -Ag/rGO nanocomposites as a substrate, with the Ag NPs enhancing the signal because of the effective conductive matrix. The layer assembly process of the immunosensor was verified by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the fabricated immunosensor showed good linearity over a wide concentration range from 1 pg mL −1 to 200 ng mL −1 with a low detection limit of 0.98 pg mL −1 , and exhibited excellent specificity, good stability, and reproducibility. These qualities can contribute to the successful application of a label-free immunosensor in the detection of AFP in human serum.
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PubMed
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JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Kui Zhang,Mingquan Ye,Aijun Han,Jiling Yang
In this study, molybdenum disulfide-reduced graphene oxide (MoS 2 -RGO) composites, as ideal electromagnetic (EM) wave absorbing materials, were synthesized by one-step hydrothermal method , and their morphology, components, structure and EM wave absorbing performances were characterized. The results show that the EM wave absorbing performances of MoS 2 -RGO composites were dependent on the graphene oxide (GO) content. When the original amount of GO was 20 mg, the minimum reflection loss (RL) value of MoS 2 -RGO composites was −48.54 dB at 6.70 GHz with a thickness of 3.5 mm, and effective reflection losses were obtained in a wide range of 3.98–15.28 GHz with the thickness of 2.0–5.0 mm. Especially, the 3 mm and 8 mm wave attenuation performances of composites were explored in detail, and the maximum attenuation values were 21.75 and 21.83 dB, respectively. In consequence, MoS 2 -RGO composites are expected to be good electromagnetic wave absorbing materials in broadband.
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Journal of Nanomaterials
·
2019
·
IF 2.233
Lei Cheng,Youjun Fan,Xingcan Shen,Hong Liang
A hybrid and hierarchical nanocomposite was successfully prepared by the growth of zeolitic imidazolate framework-8 (ZIF-8) on the template of ionic liquid (IL, [Bmim][BF4]) functionalized reduced graphene oxide (IL-RGO). The structure and morphology of the IL-RGO/ZIF-8 nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and Raman spectroscopy. The results showed that RGO sheets were refrained from restacking by IL, and ZIF-8 nanoparticles grew well on the surface of IL-RGO. Owing to the synergistic effect from large surface area and excellent electrocatalytic activity of ZIF-8 and great electrical conductivity of IL-RGO, a highly sensitive sensor for dopamine (DA) can be obtained. IL-RGO/ZIF-8-modified electrode exhibits good electrocatalytic activity and electroconductive properties towards DA which were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Compared with bare or IL-RGO-modified electrodes, the IL-RGO/ZIF-8-modified electrode effectively depressed the oxidation overpotential of DA. The linear response range of DA was from to with a low detection of limit . In addition, the sensor was shown to provide satisfactory stability for the determination of DA.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 6
·4114-4120
·
IF 1.354
Huang Zhen,Ge Heyi,Wu Jiaming,Chen Juan
RGO (reduced graphene oxide)-Fe3O4 nanohybrids were successfully synthesized by a solvothermal reduction method. Fe3O4 nanoparticles, RGO and the nanohybrids were characterized using scanning electron microscopy (SEM), transmission electron
microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and vibrating sample magnetometer (VSM). The electromagnetic interference (EMI) shielding effectiveness (SE) of RGO-Fe3O4/SF/PP composite was much higher than that of Fe3O4/SF/PP composite
at 8–12 GHz, which was attributed to synergistic effect between RGO and Fe3O4 nanoparticles. The EMI SE (%) improved with the increase of RGO-Fe3O4 content and the maximum value of 80.44% was obtained for the RGO-Fe3O4/SF/PP
composite. Furthermore, the dominant shielding mechanism of RGO-Fe3O4/SF/PP was absorption.
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PubMed
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yaju Zhou,Jinze Li,Chongyang Liu,Pengwei Huo,Huiqin Wang
A multiple transmission channels, heterojunction and 3D PCN/AgBr/rGO photocatalyst was successfully synthetized by introducing the reduced graphene oxide (rGO) covering AgBr onto the surface of 3D porous g-C 3 N 4 (PCN). In PCN/AgBr/rGO, PCN as a semiconductor photocatalyst provides the 3D framework, the heterojunction was formed with AgBr particles and PCN, rGO promotes the electron transfer simultaneously and introduces a multiple transmission channels system to increase the active species. Thanks to the heterojunction formed between PCN and AgBr, resulting rapid separation of photo-generated e − /h + at interface. The 3D PCN/AgBr/rGO nanocomposite exhibits excellent photocatalytic efficiencies for tetracycline (TC) up to 78.4% within 90 min and 2,4-dichlorophenol (2,4-DCP) up to 68.2% within 6 h. The photocatalytic rate of PCN/AgBr/rGO was much higher than 3D PCN (21%), AgBr particles (31%) and most of g-C 3 N 4 -based photocatalysts in TC degradation. Moreover, the PCN/AgBr/rGO shows high photocatalytic stability due to the significantly photocatalytic stability after four photo-degradation cycles. This study highlights the potential application of PCN/AgBr/rGO highly efficient waste water purification.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Shuai Wang,Jiguo Tu,Jiusan Xiao,Jun Zhu,Shuqiang Jiao
The growing global demands of safe, low-cost and high working voltage energy storage devices trigger strong interests in novel battery concepts beyond state-of-art lithium-ion battery. Herein, a dual-ion battery based on nanostructured Ni 3 S 2 /Ni foam@RGO (NSNR) composite anode is developed, utilizing graphite as cathode material and LiPF 6 -VC-based solvent as electrolyte. The battery operates at high working voltage of 4.2–4.5 V, with superior discharge capacity of ∼90 mA h g −1 at 100 mA g −1 , outstanding rate performance, and long-term cycling stability over 500 cycles with discharge capacity retention of ∼85.6%. Moreover, the composite simultaneously acts as the anode material and the current collector, and the corrosion phenomenon can be greatly reduced compared to metallic Al anode. Thus, this work represents a significant step forward for practical safe, low-cost and high working voltage dual-ion batteries, showing attractive potential for future energy storage application .
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yu You,Yangwei Ye,Mengli Wei,WeiJun Sun,Qiong Tang,Jing Zhang,Xing Chen,Heqin Li,Jun Xu
In this work, we report a three-dimensional (3D) MoS 2 /rGO foam based sulfur cathode with improved electrochemical performance for lithium-sulfur batteries. The porous MoS 2 /rGO foam is prepared by a facile hydrothermal method. Few-layered MoS 2 nanosheets with mixed 1T and 2H phases are developed in situ on the basal plane of the reduced graphene oxide (rGO), forming a continuous 3D porous network. It is found that the porous MoS 2 /rGO foam shows synergistic effects of high conductivity, large surface area, strong polysulfide chemisorption and high catalytic activity, consequently resulting in enhanced rate performance and cycling capability of lithium-sulfur batteries. The cells constructed with the MoS 2 /rGO/S cathodes exhibit a high reversible capacity of 1100 mA h g −1 at 0.2 C, an outstanding cycling stability with a low capacity fading rate of 0.15% after 300 cycles at 1 C, and an excellent rate performance up to 620 mA h g −1 at 2 C. Our work reveals that the porous MoS 2 /rGO foam based sulfur cathodes are potential for future high-performance lithium-sulfur batteries.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Wenjun Liu,Jingyu Cai,Zhengxin Ding,Zhaohui Li
TiO 2 /RGO composite aerogels with TiO 2 nanostructures grown on interconnected three-dimensional RGO porous networks were fabricated via a facile one-pot hydrothermal method. The as-obtained composite aerogels show controllable and continuously tunable surface wettability from super-hydrophobic to super-hydrophilic depending on the amount of incorporated TiO 2 . The TiO 2 /RGO composite aerogels with varied surface wettability can selectively degrade different pollutants in aqueous systems. The capability of forming the TiO 2 /RGO aerogels with tunable surface wettability for selective photocatalysis is important since such materials are especially useful in some systems which contain extremely poisonous contaminants in low concentration together with large quantity of un-poisonous chemicals.
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Environmental Chemistry Letters
·
2017
·Vol. 16
·期 1
·251-264
·
IF 3.594
Yein Win Thi,Wang Qun,Feng Xueying,Li Yang,Wu Xiaohong
Nanocomposites composed of two or more components with desirable performance have attracted tremendous attention, mainly due to the synergic effect between the components. The effective combination of ZnO and reduced graphene oxide would lead to ameliorate the photocatalytic performance. To enhance applicability of semiconductor photocatalytic, the composites used should be good interfacial contact governed by suitable particle size distribution. Herein we aim to fabricate the different crystallize size of ZnO nanoparticles (NPs) in ZnO–reduced graphene oxide (ZnO–rGO) nanocomposites by sonochemical synthesis and subsequent facile drying treatment method. The Zn precursor, Zn(Ac) 2 , with a plenty of functional groups, was used as a starting source for both reduction of graphene oxide and formation of ZnO on rGO sheets through chemical bonds without the addition of hazardous reducing agents. LiOH was chosen as an assistive reagent to enhance the complete reaction between Zn(Ac) 2 and GO in the formation of ZnO–rGO nanocomposites. More remarkably, drying condition has the great influence on the crystallize size of ZnO NPs in as-prepared ZnO–rGO nanocomposites. It is found that ZnO–rGO nanocomposites dried at −50 °C (freeze drying) show the highest photocatalytic efficiency in the degradation of rhodamine B (RhB) as compared to ZnO–rGO nanocomposites by other drying conditions under visible-light irradiation. Correlating the crystallize size obtained by different drying temperatures with the photocatalytic activity, it is probed that the smaller crystallize size in ZnO–rGO nanocomposites enhances the interfacial contact and a chemical bonding between rGO and ZnO NPs leading to the effective separation of electrons and holes. In addition, the O
·− 2
anion was determined to be the main active oxidant by free radicals trapping experiment and a photodegradation mechanism of ZnO–rGO nanocomposites over rhodamine B (RhB) was proposed based on our observations.
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