NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 19
·15974-15984
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IF 3.201
Wenqian Fan,Zhi Zhu,Yang Yu,Zhi Liu,Chunxiang Li,Pengwei Huo,Yue Qiu,Yongsheng Yan
In the present work, the ternary hybrid photocatalyst Fe3O4@g-C3N4/RGO is developed by a facile hydrothermal method, which shows a satisfactory degradation rate (90%) and stability in degrading tetracycline. The improvement in the photocatalytic activity of the ternary hybrid photocatalyst is attributed to the Fe3O4 nanobelt and RGO. As a center of oxidation–reduction, the Fe3O4 nanobelt can utilize electrons effectively. RGO with good conductivity is an outstanding electron transporter, which inhibits the recombination of electron–hole pairs. Moreover, the results of the ESR and the radical capture experiment prove that h+ and ˙O2− are the major active species in the tetracycline removal process. At the same time, the degradation intermediates of tetracycline and the photocatalytic mechanism is discussed in this paper in depth. The novel design concept is expected to be used in practical applications.
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ChemElectroChem
·
2018
·Vol. 5
·期 21
·3176-3182
·
IF 4.446
Rong Chen,Haiyan Zhang,Jian Xie,Yingxi Lin,Jiale Yu,Liangguang Chen
Graphical A lithium nickel cobalt aluminium oxide/reduced graphene oxide (LNCAO/RGO) composite is synthesized by chemical lithiation of commercial NCA, followed by coating with RGO. The effects on electrochemical performances and thermal stability are investigated. RGO shells provide protection against electrolyte corrosions and diminish Li + /Ni 2+ disordering, resulting in remarkable long-term cycling stability, rate capability and thermal stability. Ni-rich materials are promising Li-ion battery cathodes due to their high capacity but still suffer from electrolyte corrosions and inferior thermal stability, limiting the lithium storage capability. To improve both, lithium storage performances and thermal stability, LiNi 0.815 Co 0.15 Al 0.035 O 2 (LNCAO)/reduced graphene oxide (RGO) composites are synthesized by chemical lithiation of commercial Ni 0.815 Co 0.15 Al 0.035 (OH) 2 precursors with LiOH ⋅ H 2 O, followed by simply wet coating with RGO. The effects of such RGO modifications on lithium storage performances and thermal stability of the achieved LNCAO/RGO are investigated. Compared to LNCAO, the unique LNCAO/RGO (with ∼2.5 wt.% RGO) electrodes exhibit considerably improved cycling stability and high-rate capability (a reversible capacity of 135 mAh g −1 at 10 C), with a capacity decay rate of 0.07 % per cycle at 1 C, half of that of pristine LNCAO (0.14 %/cycle). As evidenced by differential scanning calorimetry, thermal stability is also significantly enhanced since the heat generation decreases from 912 to 586 J g −1 for pristine LNCAO and LNCAO/RGO, respectively. This could be ascribed to the unique structures and the encapsulated RGO coating layers, effectively protecting LNCAO against electrolyte corrosions and decreasing the level of Li + /Ni 2+ disordering. This study helps us further understand the critical roles of RGO layers in electrochemical performances and thermal stability of Ni-rich-based cathodes for lithium/sodium storage.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Min Yao,Yao Meng,Xiang Mao,Xingming Ning,Zhen Zhang,Duoliang Shan,Jing Chen,Xiaoquan Lu
The porphyrin aggregate is recognized as an attractive candidate for developing artificial light-harvesting systems. Using 5, 10, 15, 20-tetrakis-(4-carboxyphenyl) porphyrin (TCPP), the porphyrin aggregates with different morphologies (sphere, rod and flake) are controllably prepared by the surfactant-assisted self-assembly reaction, and then synthesize the ternary bionic-system (e.g. porphyrin composites). These composites are characterized by scanning-electron microscopy (SEM), atomic force microscope (AFM) and spectroscopic technology. The combinatorial technique consisted of ultraviolet–visible spectroscopy and scanning electrochemical microscopy (UV–vis/SECM) is used to record SECM approach curves of porphyrin photocatalysis under visible light illumination at the specific zones, where morphology-dependent porphyrin composite is recognized to be distributed evenly on ITO surface. Heterogeneous photoelectron transfer rates ( k eff ) are given by simulating SECM approach curves. It is suggested that rod-like porphyrin aggregate composite has highest photocatalytic efficiency with the kinetics rate to be 8.624 × 10 −2 cm s −1 , the largest k eff of which is obtained at the excitation wavelength of 469 nm. These findings are also proved by photocatalytic decomposition test of pollutants (methyl orange). It is indicated that one-dimensional nanostructure is advantageous for separation of electrons and holes and directional transmission of photoelectron.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xiaojuan You,Yumei Chen,Jingming Zhou,Hongliang Liu,Yankai Liu,Yanhua Qi,Chao Liang,Peiyang Ding,Xifang Zhu,Aiping Wang,Gaiping Zhang
Concanavalin A (ConA), as a carrier for immobilizing antibodies, was used for the first time in electrochemical immunosensor. In this work, a label-free electrochemical immunosensor based on Ag nanoparticles-reduced graphene oxide (AgNPs-rGO) nanocomposite and ConA was successfully prepared to detect arsanilic acid (ASA). AgNPs-rGO nanocomposite displayed superior conductivity and redox capability. Specially, ConA showed excellent binding ability with monoclonal antibody of ASA through lectin-sugar interactions. Under the optimized conditions, the proposed electrochemical immunosensor showed a linear dependence over ASA concentrations ranging from 0.025 ng/mL to 25 ng/mL with a low detection limit of 0.011 ng/mL. Furthermore, the immunosensor was used to monitor ASA in chicken and egg with good precision and accuracy. In conclusion, the simple and low-cost immunosensor was desirably applied as a useful candidate for detection of ASA in animal derived food.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Dinh-Trinh Tran,Thi-Phuong-Thao Vu,Santi Kongmany
In this study, ZnFe 2 O 4 , BiVO 4 , and ZnFe 2 O 4 /BiVO 4 /rGO materials were synthesized using the hydrothermal method in mild conditions to study the oxytetracycline (OTC) degradation process. The results on surface morphology, functional group, structure, and optical and electrochemical characteristics revealed that ZnFe 2 O 4 /BiVO 4 /rGO were successfully prepared with high purity and good distribution of chemical elements. The impact of different parameters like pH, catalyst load, reaction time, initial OTC concentration, and the presence of ozone-nanobubbles on the OTC degradation efficiency was systematically examined to obtain optimal treatment conditions. Synergic effects between ozone-nanobubbles and ZnFe 2 O 4 /BiVO 4 /rGO heterojunction led to an enhancement of over 20 % of OTC degradation yield. The OTC degradation reached 96.3 % within 100 min at optimal conditions (pH 7.0, [Cat.] = 0.5 g/L, and [OTC] = 20 mg/L). The combination of ZnFe 2 O 4 and BiVO 4 allowed to benefit from the generation of both effective electrons and holes, which enhanced the generation rate of both superoxide and hydroxyl radicals responsible for degrading the pollutant in water while rGO sheets contributed to slowing down the recombination rate between electrons and holes and improving the photocatalytic activities of the ZnFe 2 O 4 /BiVO 4 /rGO. Liquid chromatography-mass spectrometry (LC-MS) analyses were deployed to figure out intermediate substances and possible degradation pathways of the OTC degradation process. The ZnFe 2 O 4 /BiVO 4 /rGO heterojunction exhibited a pretty good durability and stability, and was easily recovered with the aid of a magnet. The toxicity of the by-products was significantly declined compared to the OTC antibiotic.
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NANOTECHNOLOGY
·
2016
·Vol. 28
·期 2
·025501
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IF 3.573
Bingrong Wang,Yang Cao,Yong Chen,Xiaoyong Lai,Juan Peng,Jinchun Tu,Xiaotian Li
NiCo2O4 nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu2O/GO and fabricated NiCo2O4/rGO nanocomposites based on a Cu2O/GO template. The structure and morphology of the hierarchical NiCo2O4/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo2O4/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo2O4/rGO could achieve high-sensitivity detections of glucose. The NiCo2O4/rGO composite has a detection range of 0.04 mM to 1.28 mM, a sensitivity of 2082.57 μA mM−1 cm−2, and a detection limit of 0.7 μM. The composite further exhibits obvious stability, superior reproducibility, and excellent selectivity. This study demonstrates that NiCo2O4/rGO is a unique and material with high potential in glucose sensing.
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PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 114
·113298-113306
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IF 3.289
Yan Yuan,Bo Peng,Hang Chi,Cong Li,Ren Liu,Xiaoya Liu
We report the preparation of poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles (NPs) and graphene oxide (GO) ink-based layer-by-layer inkjet printing humidity sensors. Sulfonate polystyrene:PEDOT NPs (SPS:PEDOT NPs) were prepared with hard template SPS NPs and GO was synthesized through a modified Hummers' method. Next, the SPS:PEDOT NP/GO multilayer films were printed layer by layer, with one layer of GO followed by one layer of SPS:PEDOT NP ink on the flexible poly-ethylene terephthalate (PET) substrate by using a home inkjet printer. The morphology and structure of the SPS:PEDOT NPs and GO were characterized through TEM and Raman spectroscopy and those of the film were investigated through optical microscopy. SPS:PEDOT NP-reduced GO (SPS:PEDOT NP/RGO) composite sensors were obtained after thermal annealing. To assess their humidity sensing properties, the sensors were exposed to a wide range of relative humidities (RH 0–98%) at room temperature. The SPS:PEDOT NP/RGO PET-based sensor exhibited superior humidity sensing properties in a wide response range (0.13–68.46%), short response and recovery time (39 and 57 s, respectively), and excellent repeatability and flexibility. The resistance of sensors was almost invariable even after folding 200 times. Overall, the SPS:PEDOT NP/RGO PET-based sensors can be used as humidity sensors.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiantao Feng,Yanhui Hou,Yechen Wang,Liangchao Li
Hierarchical structured ZnFe2O4@SiO2@RGO core–shell nanocomposites were prepared via a “coating–coating” route, and its structure, composition and electromagnetic properties were characterized. Compared with the binary composites of ZnFe2O4@SiO2, the hierarchical ZnFe2O4@SiO2@RGO ternary composites exhibited enhanced electromagnetic wave (EMW) absorption properties in terms of the effective bandwidth and minimum reflection loss (RL). Furthermore, EMW absorption properties of the prepared samples can be tuned by changing RGO content and thickness of SiO2 layer to reach the best impedance match. The minimum RL of the sample with a thickness of 2.8 mm can reach −43.9 dB at 13.9 GHz, and its effective bandwidth (RL ≤ −10 dB) was up to 6 GHz. Hence, the obtained products can be a new candidate for lightweight EMW absorbing materials.
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RSC Advances
·
2014
·Vol. 4
·期 68
·36040-36045
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IF 3.708
Yan Liu
Composites of titanium dioxide–reduced graphene oxide (TiO2–RGO) have been prepared via an efficient and facile hydrothermal reaction of graphene oxide and Ti(OH)4 in a ethanol–water solvent. The structure and composition of the composites have been characterized by X-ray diffraction, Scanning electron microscopy, Brunauer–Emmett–Teller specific area analysis, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy. The results showed that the TiO2–RGO composites exhibited a layered structure with well-dispersed anatase TiO2 on the surface of the reduced graphene oxide. Compared with the pure TiO2 nanoparticles, the composites had larger surface area, and extended the photoresponse range to the visible light region. The photocatalytic activity of the composites was much higher than that of TiO2 in the photodegradation of methyl orange (MO) under visible light irradiation.
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RSC Advances
·
2016
·Vol. 6
·期 113
·112581-112588
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IF 3.289
Yumeng Liu,Xiao Zhang,Junpeng Wang,Ping Yang
Thin graphitic C3N4 nanosheets (g-C3N4 NS) with bright blue photoluminescence were prepared through an acid and alkali corrosion and ultrasonic-assisted method. g-C3N4 NS/reduced graphene oxide (RGO) sample which was prepared through a hydrothermal synthesis offered high separation and transfer efficiency of photogenerated carriers because of the thin g-C3N4 NS attached closely to the RGO. The introduction of RGO sheets provided prominent advantages for enhanced light absorption and promoted the transfer rate of photogenerated carriers from g-C3N4 NS. A g-C3N4 NS/RGO (3 : 2) composite not only functions as a sensor to detect Pb2+ and Cd2+ in an aqueous solution but also exhibits efficient visible-light photocatalytic performance. The application in a sensor is ascribed to the intercalation impact between thin g-C3N4 NS and heavy metal ions. Owing to the presence of more active functional groups (e.g., carboxyl and amino groups) on the surface of the g-C3N4 NS compared with the bulk form, the ions can be easily adsorbed onto g-C3N4 NS. The g-C3N4 NS/RGO composites are highly sensitive and selective in ion sensing, as well as having superior photocatalytic activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xiaoqiong Du,Chenlu Yang,Xiang Zeng,Tong Wu,Yinghui Zhou,Ping Cai,Gongzhen Cheng,Wei Luo
Transition metal phosphide based amorphous NiP/rGO hybrids have been successfully synthesized through a facile one-pot co-reduction method. The prepared NiP/rGO hybrids are characterized by powder X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and energy dispersive X-ray detector (EDX) techniques. Compared with Ni/rGO, the resulted Ni 91 P 9 /rGO hybrid exhibits superior catalytic activity toward hydrogen generation from hydrolysis of ammonia borane (NH 3 BH 3 ), with turnover frequency (TOF) value of 13.3 min −1 . The activation energy (Ea) of Ni 91 P 9 /rGO for this reaction is calculated to be 34.7 kJ mol −1 , which is much lower than those of the other reported catalysts. This superior catalytic performance may be due to the good dispersibility of Ni 91 P 9 nanoparticles and the synergistic electronic interactions between nickel and phosphorus.
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Journal of Analysis and Testing
·
2025
·
IF 7
Chen Lu,Shao Rong,Bao Chengqi,Deng Lei,Yang Minghui,Li Xiaoqing
The preparation of a sensitive electrochemical biosensor for lactate determination, devoid of lactate enzyme, is achieved through the integration of cobalt nitride and reduced graphene oxide nanosheets. The sensing platform comprises porous cobalt nitride with lactate oxidase mimic activity for efficient lactate oxidation. The incorporation of reduced graphene oxide nanosheets with a large surface area and high electron-transfer rate enhances the response current. The electrochemical biosensor exhibits good sensing performance for lactate in a neutral solution, which has a linear detection range of 1–80 mM with a detection limit of 0.51 mM via differential pulse voltammetry (DPV) measurement. Notably, the sensing platform also shows good stability and selectivity and was successfully applied to determine lactate in human serum samples.
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