MICROCHIMICA ACTA
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2019
·Vol. 186
·期 11
·1-9
·
IF 5.479
Ma Guangran,Xu Hui,Wu Meijuan,Wang Lin,Wu Jianghua,Xu Fugang
A ternary hybrid composed of molybdenum disulfide (MoS 2 ), reduced graphene oxide (rGO) and gold nanoparticles (AuNPs@MoS 2 -rGO) was prepared and used for voltammetric detection of hydroquinone (HQ), catechol (CC) or resorcinol (RC). The composition and structure of the hybrid were characterized in detail. The electrochemical behaviors of a glassy carbon electrode (GCE) modified with the hybrid towards the oxidation of HQ, CC, and RC were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results revealed 3D MoS 2 is active for the catalytic oxidation of these isomers. Additional integration with rGO and AuNPs further improves catalysis due to their synergistic interaction. The enhanced catalysis leads to oxidation of HQ, CC and RC at 0.074 V, 0.178 V, and 0.527 V (vs. Ag/AgCl; by CV) with reduced overpotential (20-100 mV) and 8-fold or 3-fold increased peak current compared to those obtained on MoS 2 /GCE, or MoS 2 -rGO/GCE, respectively. Selective detection of one isomer in the presence of the other two was realized by DPV. The linear ranges are 0.1–950 μM, 3–560 μM, and 40–960 μM for HQ, CC, and RC, and the detection limits are 0.04 μM, 0.95 μM, and 14.6 μM, respectively. The sensor also shows good selectivity and displays satisfactory recovery for real sample analysis.
Schematic illustration of the preparation of AuNPs@MoS 2 -rGO hybrid by hydrothermal growth of MoS 2 -rGO and subsequent electrodeposition of gold nanoparticles (AuNPs), and its application for selective detection of hydroquinone, catechol and resorcinol by voltammetry.
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RSC Advances
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2019
·Vol. 9
·期 55
·31979-31987
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IF 3.049
Wenbin Wang,Ruidong Xu,Bohao Yu,Xuanbin Wang,Suyang Feng
Electrochemical decomposition of water to produce oxygen (O2) and hydrogen (H2) through an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER) is a promising green method for sustainable energy supply. Here, we demonstrate that cauliflower-like S-doped iron microsphere films are materials that can efficiently decompose water as an electrocatalyst for the oxygen evolution reaction. FeSx films are prepared by a simple one-step electrodeposition method and directly grow on copper foam from a deep eutectic solvent, ethaline (mixture of choline chloride and ethylene glycol), as a durable and highly efficient catalyst for the OER in 1.0 M KOH. The prepared FeSx/CF, as an oxygen-evolving anode, shows remarkable catalytic performance toward the OER with a moderate Tafel slope of 105 mV dec−1, and require an overpotential of only 340 mV to drive a geometrical catalytic current density of 10 mA cm−2. In addition, this catalyst also demonstrates strong long-term electrochemical durability. This study provides a simple synthesis route for practical applications of limited transition metal nano catalysts.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiuquan Xu,Songmei Wang,Xiaofeng Yu,Jila Dawa,Dongliang Gui,Ronghui Tang
Photocatalytic inactivation has been proved to be an effective strategy for controlling biohazards. Herein, the novel Ag deposited phosphorus and sulfur co-doped g-C 3 N 4 (PSCN) composites with different Ag content were constructed via a facile calcination combining with biogenic-reduction method for inactivating Escherichia coli ( E. coli ). The detailed characterization results indicated that P and S elements were successfully co-doped into g-C 3 N 4 (CN) lattice and Ag nanoparticles (NPs) were evenly deposited on the surface of PSCN with diameter range of 4–20 nm. The Ag/PSCN at depositing amount of 4 wt% (Ag/PSCN-4) achieved the strongest photocatalytic inactivation along with excellent stability, which could completely inactivate 7.0 log cells of E. coli within 60 min of visible light irradiation. This improved bactericidal performance was mainly attributed to the synergistic effects of P-S co-doped together with Ag deposition, which resulted in the increased visible light utilization, the improved separation and transfer efficiency of photo-induced charge carriers. Moreover, active species trapping experiments revealed that the generated superoxide radicals ( O 2 − ) and holes (h + ) played the significant roles in photocatalytic inactivation process. Our present work presented a promising and environmentally friendly strategy to enhance the photocatalytic capacities of CN based composites for pathogens inactivation.
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CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Fang Li,Dennis Y.C. Leung
A heterojunction structure of BiVO 4 coupled with a narrow bandgap photocatalyst Bi 2 S 3 was fabricated forming a composite material with strong capacity in visible light absorption and enhancement in the separation rate of photogenerated charge carriers owing to their suitable band structures. As a result, efficiency of hydrogen production through photoelectrocatalysis is highly enhanced. The morphology and composition of as-prepared sample electrodes are measured through X-Ray Diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The performance of the hybrid nanostructure Bi 2 S 3 /BiVO 4 photoelectrode was found to be related to the growing process of Bi 2 S 3 nanowire during the hydrothermal preparation process. The composited Bi 2 S 3 /BiVO 4 photoanode achieved a photoconversion efficiency of 2.9% which is nearly 3-fold that of the bare BiVO 4 electrode under visible light irradiation, while the hydrogen production was greatly enhanced by nearly 5-fold in the photoelectrocatalytic hydrogen production reaction.
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ACS Applied Nano Materials
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2019
·
IF 0
Le Zhou,Hongwen Zhang,Haoming Bao,Yi Wei,Hao Fu,Weiping Cai
Silver (Ag)-based Janus nanoparticles (NPs) are of broad interest for extensive applications due to their excellent photoelectric performances and special structure. However, it still remains challenging to prepare this type of Janus NP with high uniformity in a large scale. Here, we present a facile wet-chemical strategy to synthesize Ag-MoS2 Janus NPs via adding an appropriate amount of AgNO3 into the MoS2 nanosphere (200 nm in size)-contained aqueous solution. These Janus NPs represent a new type of heterogeneous nanostructure. Each Janus NP is made up of one tiny-Ag-dot-decorated MoS2 nanosphere and one polyhedral Ag single crystal (∼100 nm in size), and both of them attach together, showing a snowman-like dimer. Such Janus NPs or dimers can not be detached by the ultrasonic vibration even with a high power, showing strong adhesion between them. Further, the morphology and size of the polyhedral Ag nanocrystals attached on MoS2 nanospheres can be controlled by the AgNO3 addition amount, reaction time, and temperature. A growth model is proposed to understand the formation of these Janus NPs, which is based on the tiny Ag dots’ aggregation and oriented connection mechanism. Importantly, such Ag-MoS2 Janus NPs can be used as nanomotors, due to their asymmetric catalytic component structure, and self-propelled in H2O2 fuel solutions. They show good directional motion and significant dependence of their speed on fuel concentration. This study expands our understanding of the formation of heterogeneous Janus particles and provides a promising platform to investigate active colloids as nanomotors.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 1
·1-12
·
IF 2.132
Hou Junjie,Zhou Xuemei,Yang Zhi,Nie Huagui
Oxygen evolution reaction (OER) catalysts are of central importance for electrocatalytic water oxidation and fuel generation, while it is still an urgent requirement to design and develop efficient OER catalysts with rapid kinetics and low overpotentials. Herein, we report an electrochemical deposition method to fabricate carbon nanotubes/N-doped cuprous sulfide (CNTs/N-Cu 2 S) composites using thiourea and a CuSO 4 solution as the S and Cu sources, respectively. The advantages of this strategy include low cost, simple processing and the absence of templates or surfactants that can otherwise affect the electrochemical properties of the products. The N supplied by the thiourea can be used as a doping agent as a result of the in situ formation of small N-Cu 2 S particles, which can increase larger surface area and create more active sites to enhance OER catalytic activity, compared with that obtained with materials synthesized without adding the thiourea. The synergic interface of CNTs and N-Cu 2 S can improve conductivity and efficient chemical transfer in the composites electrodes by introducing CNTs. Under the optimal experimental conditions, the CNTs/N-Cu 2 S-5cyc composites present an excellent activity with the current density of 10 mA cm −2 at a low OER overpotential of 280 mV, the Tafel slope of 63 mV dec −1 and a strong electrochemical stability in 1.0 M KOH solution.
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ACS Applied Energy Materials
·
2019
·
IF 0
Yongkun Liu,Guohua Jiang,Zheng Huang,Qiuling Lu,Bo Yu,Uwamahoro Evariste,Pianpian Ma
In this paper, seasame-ball-like core–shell hollow mesoporous carbon spheres decorated by NiCo2S4 nanoparticles (NiCo2S4/HMCSs) were prepared via a hydrothermal method. The obtained NiCo2S4/HMCSs could be used as the positive electrodes for asymmetric supercapacitors (ASCs), combining the outstanding electroconductivity of carbonic materials and high capacity of NiCo2S4 nanoparticles. The morphology and structure properties of the obtained NiCo2S4/HMCSs were characterized. The electrochemical properties of the as-obtained composites were characterized by an electrochemical workstation, showing an outstanding capacity of 1098.5 F g–1. Finally, ASCs were further fabricated by using the NiCo2S4/HMCSs as the cathode and hollow mesoporous carbon spheres (HMCSs) as the anode. Moreover, the assembled ASCs exhibited a good energy density of 35.1 Wh kg–1 at a moderate power density of about 203.5 W kg–1 and good cycle ability of ∼90% even after 3000 cycles.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jun Wang,Yining Pan,Liangxing Jiang,Min Liu,Fangyang Liu,Ming Jia,Jie Li,Yanqing Lai
Copper ions are not only physiologically essential for life but also hazardous materials causing a series of neurodegenerative diseases. Photoelectrochemical (PEC) detection has attracted a large amount of focus as a potential strategy to develop Cu2+ ion sensors. However, relatively low photocurrent signals with poor antidisturbance ability and the limited concentration range have prevented its practical applications. Here, we designed a WO3/CdS heterojunction photoanode for the PEC determination of Cu2+ in aqueous solution through a simple two-step chemical bath deposition method. The obtained WO3/CdS photoanode had a nanoplate morphology and showed an enhanced photoresponsivity with a photocurrent density of 1.5 mA/cm2 at 1.23 V versus RHE under illumination. Naturally, it exhibited a low detection limit (0.06 μM) and wider range (0.5 μM to 1 mM) for Cu2+ PEC detection first, suggesting that the WO3/CdS heterojunction photoanode is a promising tool to monitor copper pollution in natural environments.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Guihua Zhang,Ying Yu,Li Zhang,Bixia Lin,Yumin Wang,Manli Guo,Yujuan Cao
Prostate specific antigen (PSA) is of great significance for clinical detection. Herein, a surface molecular imprinted sensor based on a novel cooperated signal amplification strategy was constructed for the precise detection of PSA. MoS 2 and gold nanoparticles were modified on the electrode surface as the sensing substrate, PSA template and 4-mercaptophenylboronic acid were employed to form the surface imprinted cavities, and the gold polymerized methylene blue composites labeled 4-mercaptophenylboronic acid was constructed as the tracing tag. Cyclic voltammetry, electrochemical impedance spectroscopy and differential pulse voltammetry measurements were performed to investigate the formation process of the sensor. Transmission electron microscopy, scanning electron microscopy and energy dispersive spectrometer analysis were utilized for the characterization of the sensing substrate and tracing tag. Once the target PSA was anchored on the sensor, an amplified signal was obtained by the cooperated electrochemical catalytic interaction of the nanomaterials on the tracing tag and substrate. The constructed sensor showed a wide linear range from 1.0 × 10 −4 to 1.0 × 10 4 ng·mL -1 , and the detection limit was 0.03 pg·mL -1 . Besides, such a sensor exhibited favorable selectivity, reproducibility and stability in the assays, indicating an expected application prospect in the determination of tumor markers.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Meng Chen,Chao Wang,Lei Wang,Jixiang Xu
In this work, carbon quantum dots@In 2 S 3 hollow tube (CQDs@In 2 S 3 ) with sheet-like hierarchical structure was synthesized by sulfidation CQDs@In-MIL-68. The CQDs@In 2 S 3 -2 exhibited the optimal Cr(VI) reductive ratio of nearly 100% after 45 min light irradiation in solution with pH of 4. The enhanced Cr(VI) reduction activity was ascribed to the efficient separation of electrons and holes after coupling of CQDs. The ·O 2 − was the dominant active specie to reduce Cr(VI), and possible mechanism was proposed. This work provides thought for design of high-performance photocatalysts by loading electron-collecting species to remove environmental pollutants .
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Hongrui Zhu,Chun Zhang,Kefeng Xie,Xingang Li,Guangfu Liao
Defect engineering, exposed crystal facets, and Z-scheme mechanism are promising strategies to greatly promote photocatalytic performance. Herein, the ZnFe 2 O 4 (ZFO) with Ag-doping, oxygen vacancies and different exposed crystal facets was firstly prepared by a facile hydrothermal strategy. Subsequently, the MoS 2 flowers were in-situ grown on the surface of the prepared Ag-doping ZFO (Ag-ZFO) for fabricating MoS 2 /Ag-ZFO Z-scheme heterojunction by hydrothermal strategy. Due to the synergistic effects of defect engineering (Ag-doping and oxygen vacancies), exposed crystal facets, and Z-scheme mechanism, the photocatalytic activity for tetracycline degradation was evidently improved. More importantly, the prepared MoS 2 /Ag-ZFO (T) also show excellent photocatalytic performance under real environment water. This work offers a new insight for future design and development of highly active photocatalysts.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Ju Jian,Zhang Xinyu,Li Lin,Regmi Sagar,Yang Guoqiang,Tang Shixing
Understanding the dynamic changes in antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is essential for evaluating the effectiveness of the vaccine and the stage for the recovery of the COVID-19 disease. A rapid and accurate method for the detection of SARS-CoV-2-specific antibodies is still urgently needed. Here, we developed a novel fluorescent lateral flow immunoassay (LFA) platform for the detection of SARS-CoV-2-specific IgM and IgG by the aggregation-induced emission carbon dots conjugated with the SARS-CoV-2 spike protein (SSP). The aggregation-induced emission carbon dots (AIE-CDs) are one of the best prospect fluorescent probe materials for exhibiting high emission efficiency in both aggregate and solid states. The AIE-CDs were synthesized and displayed dual fluorescence emission, which provides a new perspective for the design of a high sensitivity testing system. In this work, the novel LFA platform adopted the AIE carbon dots, which are used to detect SARS-CoV-2-specific IgM and IgG conveniently. Furthermore, this sensor had a low LOD of 100 pg/ml. Therefore, this newly developed strategy has potential applications in the areas of public health for the advancement of clinical research.
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