SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Cong Zheng,Cheng Zhang,Kui Zhang,Jian Zhang,Ling Jin,Abdullah M. Asiri,Khalid A. Alamry,Lifang He,Xiangfeng Chu
The design and synthesis of materials with unique hierarchical structure has important scientific and practical significance in improving their sensing properties. Herein, ZnFe 2 O 4 nanoparticles assembled nanosheets (ZnFe 2 O 4 NSs) grown on reduced graphene oxide (RGO) was creatively constructed via a simple and fast microwave-assisted solvothermal method. RGO played the role as ground for the growth of ZnFe 2 O 4 NSs, and the growing process was investigated by a series of irradiation time dependent experiments. Finally, the gas sensing properties for the as-prepared ZnFe 2 O 4 NSs/RGO composites were evaluated. The integration of RGO was found to increase the selectivity of ZnFe 2 O 4 to ethanol. It was found that the ZnFe 2 O 4 NSs/RGO composite with an irradiation time of 4 h (ZnFe 2 O 4 NSs/RGO 4 h) based sensor showed better ethanol sensing performance than that of sensors based on ZnFe 2 O 4 NSs assembled sphere without RGO, ZnFe 2 O 4 nanoparticles and ZnFe 2 O 4 NSs/RGO composites with other irradiation time, respectively. ZnFe 2 O 4 NSs/RGO 4 h based sensors showed good stability and satisfied response to ethanol ranging from 0.1 ppm to 100 ppm at 210℃. The high response was attributed to its unique architecture, the integration of RGO and the formation of heterojunction between RGO and ZnFe 2 O 4 .
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高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Mengwen Xu,Yanying Wang,Enna Ha,Huijuan Zhang,Chunya Li
A photocatalyst based on the integration of reduced graphene oxide (rGO) with Bi 4 O 5 Br 2 nanosheets was facilely prepared and was confirmed by transmission electron microscope , scanning electron microscope, X-ray diffraction and Raman spectroscopy . The integration of rGO can effectively improve the adsorption and the photocatalytic properties of Bi 4 O 5 Br 2 nanosheets towards the target antibiotics under visible light irradiation. rGO/Bi 4 O 5 Br 2 nanocomposite containing 1.0 wt% of rGO exhibits the optimal adsorption and photocatalytic activity towards ciprofloxacin (CIP), norfloxacin (NOR) and tetracycline (TC). The removal efficiencies of CIP, NOR and TC are 97.6%, 80.7% and 98.7%, which are higher than that obtained with Bi 4 O 5 Br 2 nanosheets. The capture experiments and ESR data show that ·O 2 − , OH· and h + are the main active species that participated in the photodegradation system. This work provides a simple strategy to integrate rGO with Bi x O y X z (X = Cl, Br, I) nanosheets to construct effective photocatalysts for the degradation of antibiotics.
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高影响因子
Processes
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2020
·Vol. 8
·期 11
·1493
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IF 2.753
Yue Wang,Minqi Zhang,Shuhang Chang,Shengji Li,Xuefeng Huang
Microscale combustion has potential application in a micro power generator. This paper studied the ignition and combustion behavior of individual graphite microparticles in a micro-combustor to explore the utilization of carbon-based fuels at the microscale system. The individual graphite microparticles inside the micro-combustor were ignited by a highly focused laser in an air flow with natural convection at atmospheric temperature and pressure. The results show that the ignition of graphite microparticles was heterogeneous. The particle diameter had a small weak effect on ignition delay time and threshold ignition energy. The micro-combustor wall heat losses had significant effects on the ignition and combustion. During combustion, flame instability, photophoresis, repetitive extinction and reignition were identified. The flame structure was asymmetric, and the fluctuation of flame front and radiation intensity showed combustion instability. Photophoretic force pushed the graphite away from the focal point and resulted in extinction. Owing to large wall heat loss, the flame quickly extinguished. However, the graphite was inductively reignited by laser.Keywords:microscale combustion;graphite;photophoresis;repetitive extinction;laser ignition
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高影响因子
ENVIRONMENTAL TECHNOLOGY
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2020
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IF 2.213
Juan Chen,Shanshan Liu,Heyi Ge,Yu Zou
A novel bio-adsorbent was prepared from corn straw pith (CSP), graphene oxide (GO) and TiO2 through one-step synthesis for adsorption and photocatalytic reduction of dyes. CSP and GO acted as stent and coat, respectively. TiO2 nanoparticles attached on the surface of the adsorbent played a role in the degradation of dyes and endowed the adsorbent with hydrophobicity. When the loading of GO and TiO2 were 5 and 20 wt.% respectively, the adsorbent had quite an ideal structure and satisfactory removal efficiency. There were an electrostatic attraction, hydrophobic and π–π interactions in the process of adsorption. The pseudo-second-order and the Langmuir model described the adsorption behaviour well. The dyes loaded on the adsorbent could be degraded by irradiation with ultraviolet light (UV). After five cycles, the removal efficiency of malachite green, methylene blue and rhodamine b by CSP-5GO-20TiO2 decreased by 3.77%, 23.89% and 32.01%, respectively. Therefore, the bio-adsorbent has the advantages of economy, environmental protection, and the concept of sustainable development.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2020
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IF 4.389
Chaochao Wen,Rina Cheng,Tao Gong,Yu Huang,Dan Li,Xuhua Zhao,Baofeng Yu,Dan Su,Zhiling Song,Wenting Liang
Synergistic photochemical therapy with high performance and weak side effects is of great importance in hepatocellular carcinoma (HCC) treatment, therefore ingenious construct of nano-based therapy agents with accurate drug delivery and high photothermal conversion efficiency is of critical to the cancer therapy. Herein, an organic-inorganic hybrid nanomaterial (MGO@CD-CA-HA) has been constructed successfully by coating the β-cyclodextrin-cholic acid-hyaluronic acid polymer (CD-CA-HA) onto the Fe 3 O 4 -graphene oxide (MGO). The MGO@CD-CA-HA revealed satisfactory multiple-targeted features including the cholic acid supplied hepatic-target, CD44-receptor target of hyaluronic acid and magnetic target of Fe 3 O 4 . Meanwhile, the hydrophobic antitumor drug camptothecin (CPT) was easily loaded by MGO@CD-CA-HA to form the MGO@CD-CA-HA/CPT nanocomposite, and the maximum theoretical adsorption capacity can reach 847.4 mg/g. Based on the facile photothermal response of MGO , the near-infrared radiation (808 nm) induced local hyperthermia was directly generated the apoptosis of tumor cells while triggered the release of CPT. Comparing with other kinds of cancer cells and normal hepatocyte cells, this PCT system provides a significant inhibitory effect for the liver cancer cells in vitro . Furthermore, the synergistic photochemical therapy presented the strong antitumor effect (the tumor inhibition rate > 90 %) in vivo . Thus, this study provided a promising multiple-targeted nanocarrier for chemo-photothermal combination therapy of liver cancer.
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高影响因子
LANGMUIR
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2020
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IF 3.557
Caili Dai,Wen Sun,Zhongzheng Xu,Jiawei Liu,Jia Chen,Zhixuan Zhu,Lin Li,Hongbo Zeng
High-performance graphene aerogels with well-developed internal structures are generally obtained by means of introducing additive materials such as carbon nanotubes, cellulose, and lignin into the aerogel network, which not only enhances the cost but also complicates the preparation process. Therefore, tailoring the internal structure of pristine graphene aerogel in a feasible way to achieve high performance is of great significance to the practical applications. Herein, a novel cysteamine/l-ascorbic acid graphene aerogel (CLGA) was fabricated by a simple one-step hydrothermal method followed by freeze-drying. Through the creative combination of the reducing agent l-ascorbic acid and cross-linking agent cysteamine, a dual-network structure was constructed by both layered physical stacking and vertical chemical cross-linking. The addition of cysteamine not only enhanced the reduction degree but also assisted the formation of more vertical connections between graphene nanosheets, resulting in more abundant pores with smaller sizes compared with graphene aerogels prepared by the traditional hydrothermal reduction method. CLGA possessed an ultra-low density of 4.2 mg/cm3 and a high specific surface area of 397.9 m2/g. As expected, this dual-network structure effectively improved the absorption capacity toward a variety of oil and organic solvents, with an outstanding oil absorption capacity up to 310 g/g. Furthermore, CLGA possessed good mechanical properties and oil/water selectivity. The absorbed oil could be recovered by both continuous absorption-removal process and mechanical squeezing, making the as-prepared aerogel superior absorbent material for a variety of applications, such as selective oil absorption and water treatment.
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高影响因子
CORROSION SCIENCE
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2020
·
IF 6.479
Dan Xue,Qing Bo Meng,Ying Xi Lu,Lin Liang,Yu Han Wei,Xian Bin Liu
Herein, polyurethane (PU)/poly(propylene oxide) grafted graphene oxide (GO-g-PPO) composite coating with anticorrosive properties was prepared by in situ polymerization. Results revealed that the anticorrosive properties of PU/GO-g-PPO-16 composite coating were greatly improved by the homogenous dispersion of GO-g-PPO-16 composites in PU coating. When the solid content of GO-g-PPO-16 composites was 0.08 wt. % in PU coating, the coating resistance was 50 times higher than that of PU coating after immersion in 3.5 wt. % NaCl (aq.) for 168 h.
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高影响因子
Nanoscale
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2020
·Vol. 12
·期 41
·21325-21333
·
IF 6.895
Xing Chen,Jianjun Jiang,Guoyu Yang,Chuanbing Li,Yujun Li
MXenes, a new class of two-dimensional materials with excellent performance, are promising materials for wearable energy storage devices. However, the lack of sufficient interaction between various MXene particles makes it difficult to translate the exceptional performance from the nanoscale to macroscale. Additionally, the intrinsic characteristic of easy oxidation limits their practical applications. Herein, inspired by the structure of wood, a biomimetic core–shell MXene@graphene oxide (MX@GO) fiber was fabricated using GO as a mechanical layer to wrap MXenes. The GO layer could easily assemble MXene particles into macroscale materials and protect them from oxidation. Therefore, the as-fabricated core–shell MX@GO fiber showed a high tensile strength (290 MPa) and excellent electrical conductivity (2400 S m−1). Notably, the conductivity of the biomimetic fiber only decreased to 1800 S m−1 with a reduction of about 30% at 100 °C. This work paves the way to fabricate MXene-based fibers with freely designed functionalities and morphologies, which are suitable for various high-value fabric-based applications.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Yanming Yang,Ming Liu,Shitong Han,Hailing Xi,Chao Xu,Rusheng Yuan,Jinling Long,Zhaohui Li
TiO 2 spherical shells with both inner and outer surface modified by graphene have been successfully constructed through a stepwise loading method. This double-sided modification method greatly increases the contact area of the shell with graphene sheets, which is beneficial for graphene to separate more photoelectrons from both the inner and outer sides of the shell simultaneously. The results of photocatalytic reduction of CO 2 into CO indicate that the modification effects of inner and outer wall of TiO 2 shell by graphene seem to be relatively independent to each other. As a result, compared with the traditional single-sided modified samples, even these optimal ones, the loading of graphene on the other side of TiO 2 shell can still improve the photocatalytic reduction performance. Moreover, the optimal dosage of graphene on one side of shell surface is always maintained, without being affected by the graphene usage on the other side. This work indicates that the unique heterojunction obtained by graphene double-sided modification is advantageous to enhance the photocatalytic CO 2 reduction performance and expected to be extended to the construction of other photocatalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Mengjie Zhang,Jiaxin Cui,Tao Lu,Guosheng Tang,Shutian Wu,Wenjing Ma,Chaobo Huang
This work proposes an anti-corrosive nanofibrous membrane by combining one-pot solvothermal reduction method and electrospinning technology as a solution to the ever-increasing water pollution issues. Such membrane is made of aromatic polymer-polyimide and further modified by reduced graphene oxide, which maintained the original performance under different external environment and multi-cycled test, and achieved high separation efficiency (99.19%) and flux (2040.04 L m -2 h −1 ) at the same time. The purification process is suitable for various contaminants and different combinations. Additionally, the inherent purification mechanism was fully explored in this study. The practicability of the membrane can be tested for the contaminated water purification, the recycle of poisonous and harmful substances, pre-process of precision extraction and so on.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Ningxiao Gao,Tingting Wan,Zhiyang Xu,Liansheng Ma,Seeram Ramakrishna,Yong Liu
Photoanode optimization of the dye-sensitized solar cell is a crucial part of its performance improvement. In this study, graphene-containing TiO 2 nanofibers were prepared by electrospinning, and the nitrogen element was doped via the hydrothermal method . After that, a nitrogen-graphene co-doped TiO 2 nanofiber photoanode was prepared using a doctor blade coating process . Micromorphological characterization revealed that nitrogen and graphene were successfully doped into composite nanofibers with favorable morphology and distribution. Ultraviolet–visible light spectroscopy and monochromatic light conversion efficiency data demonstrated that the doping of nitrogen enhanced the cell's response to sunlight. The J-V curve was obtained under solar simulation, and the conversion efficiency of 5.01% was reached, which was 26% higher than that of undoped. Therefore, the co-doped composite fiber makes a promising prospect for further applications.
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高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 15
·3311-3318
·
IF 4.154
Jianfa Chen,Chong Lin,Mengmeng Zhang,Tianxiang Jin,Yong Qian
Graphical Double doping : We develop a simple and efficient method to prepare N and Se co-doped graphene aerogel (NSeGA) as binder-free electrodes for supercapacitor applications. The results proved that Se is an efficient doping element for carbon-based materials. Furthermore, benefiting from the synergistic effect between N and Se, the NSeGA electrode shows a high specific capacity of 302.9 F g −1 at 1 A g −1 , and a high capacity retention of >94 % after 12,000 cycles. In this work, we demonstrate the successful synthesis of nitrogen and selenium co-doping graphene aerogels (NSeGA) by a convenient and scalable approach. It was found that Se is an effective doping element for improving the energy storage performance of graphene. The synergistic effect between N and Se on improving the performance of supercapacitor was also confirmed. The binder-free NSeGA electrode exhibited a high specific capacity of 302.9 F g −1 at a current density of 1 A g −1 , which is much higher than that of singly Se-doped graphene aerogel (SeGA, 183.92 F g −1 ) and singly N-doped graphene aerogel (NGA, 150.16 F g −1 ). Even though the current density reached up to 10 A g −1 , 90.4 % of its specific capacitance was maintained. The NSeGA also maintained about 94.1 % of the initial capacitance after 12,000 cycles at a current density of 2 A g −1 . Moreover, the constructed NSeGA//NSeGA symmetric supercapacitor showed a high energy density of 26.3 W h kg −1 at a power density of 900 W kg −1 . Accordingly, as a new type of carbon-based material, NSeGA has a good prospect in the field of supercapacitors.
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