JOURNAL OF FLUORESCENCE
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2020
·Vol. 30
·期 6
·1463-1468
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IF 2.093
Xue Gao,Zhiying Ma,Xiuying Liu,Lijun Tang,Jianrong Li
Graphene quantum dots (GQDs), which have high photostability, anti-photobleaching and scintillation, good biocompatibility and low toxicity, are important member of the fluorescent material family, and have attracted extensive research interest. In this paper, a fluorescence resonance energy transfer (FRET) biosensor based on protoporphyrin IX (PpIX) and GQDs was developed for melamine detection. PpIX was bound to the surface of GQDs to produce self-assembled nanosensors, and a FRET process occurred between GQDs and PpIX. However, due to the combination of melamine and PpIX, the FRET process was shut down in the presence of melamine. The FRET system could quickly and accurately detect melamine with a detection range of 1.0 × 10 −8 to 2.0 × 10 −6 mol/L based on the fluorescence intensity ratio of PpIX and GQDs, and the detection limit was 3.6 × 10 −9 mol/L. This method obtained satisfactory results when it was employed to the determination of melamine in milk samples.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
·
IF 2.627
Yexun Shi,Chang Li,Liming Shen,Ningzhong Bao
The graphene oxide powder (GOP) obtained from the spray drying process often exhibits poor re-dispersibility which is considered due to the partial reduction of GO sheets. The reduction of drying temperature can effectively increase the re-dispersibility of GOP, but result in a decreased drying efficiency. Herein, we found that the re-dispersibility of GOP is strongly affected by its microstructure, which is determined by the feed concentration. With the increase of feed concentration, the GO nanosheet assembly varies from the disordered stacking to relatively oriented assembly, making the morphology of the GOP transform from ball-like (the most crumpled one) to flake-like (the least crumpled one), and the 0.8 mg·ml −1 is the threshold concentration for the morphology, structure, and re-dispersibility change. Once the feed concentration reaches 0.8 mg·ml −1 , the appearance of the nematic phase in droplet ensures the relatively oriented assembly of GO sheets to form the layered structure with a low crumpling degree, which greatly improves the polar parts surface tension of the solid GOP, making the GOP easier to form hydrogen bonding with water during the redispersion process, thus stabilizing dispersion. This work provides useful information for understanding the relationships between the morphology, microstructure, and final re-dispersibility of GOPs.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
·
IF 6.155
Xin Wang,Jiaqian Zhu,Xiang Yu,Xionghui Fu,Yi Zhu,Yuanming Zhang
A novel three-dimension separable and recyclable rGH-PANI/BiOI photocatalyst with the synergism of adsorption-enrichment and photocatalytic-degradation was successfully prepared via a facile three-step hydrothermal method . The three-dimension reduced graphene oxide hydrogel (rGH) in with flower-like BiOI photocatalyst uniformly distributed not only possesses excellent adsorption and electron transport properties, but also is easy to be separated from water for recycling. In addition, polyphenylamine (PANI) provides superior hole transport ability due to its delocalized π-π conjugate structure. The cooperation of rGH and PANI greatly enhances the separation efficiency of photogenerated carriers, and finally improves the photocatalytic degradation behaviors. The removal rates of Rhodamine B (RhB) by rGH-PANI/BiOI-70 % composite under visible light respectively reach 100 % and 50.13 % in static and dynamic systems, which are 12.85 and 3.58 times of BiOI, respectively. The removal rate does not show decrease after 5 recycles indicating the excellent separable and recyclable property of rGH-PANI/BiOI photocatalyst. The work provides an essential reference for designing and constructing hydrogel-based ternary composite photocatalysts with excellent synergism of adsorption and photocatalysis , which shows great potential in the treatment of water pollution.
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Microsystems & Nanoengineering
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2020
·Vol. 6
·期 1
·1-10
·
IF 5.048
Lu Qifeng,Sun Fuqin,Liu Lin,Li Lianhui,Wang Yingyi,Hao Mingming,Wang Zihao,Wang Shuqi,Zhang Ting
The memristor has been regarded as a promising candidate for constructing a neuromorphic computing platform that is capable of confronting the bottleneck of the traditional von Neumann architecture. Here, inspired by the working mechanism of the G-protein-linked receptor of biological cells, a novel double-layer memristive device with reduced graphene oxide (rGO) nanosheets covered by chitosan (an ionic conductive polymer) as the channel material is constructed. The protons in chitosan and the functional groups in rGO nanosheets imitate the functions of the ligands and receptors of biological cells, respectively. Smooth changes in the response current depending on the historical applied voltages are observed, offering a promising pathway toward biorealistic synaptic emulation. The memristive behavior is mainly a result of the interaction between protons provided by chitosan and the defects and functional groups in the rGO nanosheets. The channel current is due to the hopping of protons through functional groups and is limited by the traps in the rGO nanosheets. The transition from short-term to long-term potentiation is achieved, and learning-forgetting behaviors of the memristor mimicking those of the human brain are demonstrated. Overall, the bioinspired memristor-type artificial synaptic device shows great potential in neuromorphic networks.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Guangyuan Du,Mengli Tao,Dingyu Liu,Muhammad Kashif Aslam,Yuruo Qi,Jian Jiang,Yutao Li,Shu-juan Bao,Maowen Xu
Quasi - solid-state potassium-ion batteries (QSPIBs) are regarded as one of the most promising safety-enhanced energy storage devices. Herein, a facile method for preparing a potassium-ion composite electrolyte membrane on a large scale is presented for the first time. The as-synthesized membrane displays excellent electrochemical stability, good mechanical flexibility, and high ionic conductivity (9.31 × 10 -5 S cm −1 at 25 °C). Furthermore, QSPIBs prepared with this membrane and commercial raw material-based electrodes show superior electrochemical performance even at low temperatures (99.7 mAh g −1 at −20 °C for half QSPIBs and 90.7 mAh g −1 at −15 °C for full QSPIBs), and a promising rate performance (115.6 mAh g −1 for half QSPIBs and 90.9 mAh g −1 for full QSPIBs at 800 mA g −1 ). The reaction mechanism and structure evolution of a 3,4,9,10-perylene-tetracarboxylicacid-dianhydride (PTCDA) cathode is also systematically studied. The promising characteristics of the prepared low-cost quasi-solid-state potassium-ion batteries in this work open up new possibilities for safer and more durable batteries and a wide range of practical applications in the electronics industry.
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APPLIED COMPOSITE MATERIALS
·
2021
·Vol. 28
·期 1
·219-233
·
IF 2.181
Wang Pei,Deng Guanyu,Zhu Hongtao,Yin Jian,Xiong Xiang,Zhang Hongbo
To improve electrical conductivity of the carbon-based pantograph strip, a sliding contact material of pyrolytic carbon (PyC) coated-copper foam/carbon composite was fabricated by chemical vapor deposition technology, followed by densifying processes of furan resin impregnation and carbonization. Morphology, electrical conductivity, wear and friction behavior of the composites are investigated to clarify the effect of PyC thickness (from 0 μm to 280 μm) on tribological behaviors and current transfer characteristic. The results show that there is a good interface combination between copper foam and resin carbon matrix in the composites after the improvement of interface wettability by inserting PyC layer. The composite has great advantages in electrical conductivity and density due to the copper foam and PyC layer with three-dimensional structure. With increasing the PyC thickness, both electrical conductivity and wear resistance of the composite have steadily increasing tendency, but friction coefficient has no obvious change. In addition, an analytical model is developed to explore current transfer mechanisms of the PyC-copper foam/carbon composite, and the theoretical predictions are in agreement with the experimental observations, in term of electrical conductivity and porosity of composite preform.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yanyan Zhao,Xuhua Liang,Xiaoyun Hu,Jun Fan
Fabrication of binary composite has proved to be an efficient approach to improve the photocatalytic activity of monomer photocatalyst . In this contribution, an effective Reduced Graphene Oxide/Bismuth Tungsten Oxide (rGO/Bi 2 WO 6 ) composite with outstanding photocatalytic activity was designed by employing Bi 2 WO 6 as a primary photocatalyst and rGO as an electron acceptor and transporter for norfloxacin degradation in aquatic environment. The rGO/Bi 2 WO 6 composite displayed higher photocatalytic activity compare with pure Bi 2 WO 6 , which could degrade about 87.49% of norfloxacin with 180 min under visible light irradiation. The results of the UV–vis diffuse reflection spectrum, photoluminescence spectra and transient photocurrent response implied that the enhanced photocatalytic activity of the rGO/Bi 2 WO 6 composite could be attributed to the improved visible light-harvesting ability and the efficient charge separation ability. Additionally, the reactive-species-trapping experiments indicated that ⋅OH and e − played dominant roles during the photocatalytic degradation process. Four possible intermediates and two possible transformation pathways of norfloxacin degradation were detected by LC-MS. This present work provided a low-cost and facile green method to design of Bi-based composite.
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TALANTA
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2020
·
IF 5.339
Yiyuan Zhou,Jiabi Xu,Nan Lu,Xinyu Wu,Yu Zhang,Xiaohong Hou
MIL-101(Cr) and graphene aerogel (GA) were hybridized as a multifunctional adsorbent for the preconcentration of trace analytes. The novel MIL-101(Cr)@GA was prepared and characterized by FTIR, XRD and SEM, where GA is serving as a carrier for MIL-101(Cr). The synthesized composite as a solid phase extraction (SPE) sorbent combined with UPLC-MS/MS was applied for the determination and quantification of five NSAIDs (phenacetin, meloxicam , naproxen , diclofenac sodium and carprofen) in different environmental water samples. The parameters influencing the whole extraction process were systematically optimized. Under the most favorable. conditions, good sensitivity was achieved with a limit of detection between 0.006 and 0.012 ng mL −1 , the linear range of 0.02–2 ng mL −1 for phenacetin , meloxicam and 0.05–5 ng mL −1 for naproxen , diclofenac sodium , carprofen ( r 2 ≥ 0.9940). The satisfactory recoveries of the target analytes were in the range from 77.2 to 103.3% with relative standard deviation (RSD) from 0.6% to 8.4%. The established method was proved to be simple, highly sensitive and accurate. The adsorbent could be reusable up to nine cycles without any decrease in performance, which provides economic strategy and little waste generation. Adsorption behaviors were explored by choosing two typical types of NSAIDs as models to measure the adsorption capacity of MIL-101(Cr)@GA. The maximum adsorption capacities for PHE and NAP were 232.5 and 333.3 mg g −1 , respectively.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Shixin Zhang,Xiaomin Tang,Huaili Zheng,Dongsheng Wang,Zongli Xie,Wei Ding,Xinyu Zheng
Bacteria, especially antibiotic-resistant bacteria, in water threaten public health in countries. Simultaneous flocculation , sterilization and identification of bacteria are great challenge in water treatment . Herein we presented a three-in-one compound through combining a novel Bacitracin-based flocculant (B-g-PAMDAC) and surface enhanced Raman scattering (SERS) labels, the modified Au@AgNPs using graphene oxide (GO) and 4-mercaptophenylboronic acid (4-MPBA). B-g-PAMDAC with bactericidal groups and microblock structure was synthesized via copolymerization and self-assembly. Its functional groups and microblock structure contributed to the excellent performance in flocculation of bacteria. 4-MPBA as bacterial capture bound to the bacterial cell membrane and contributed to recognition of bacteria in flocculation. Bacteria aggregating around Au@AgNPs resulted in abundant “hot spots” and strong Raman signals. SERS labels obviously improved the sensitivity, accuracy and stability of bacteria identification even at low bacterial concentration of 1 × 10 3 CFU mL −1 . They presented distinct fingerprints of bacteria, Escherichia coli , Pseudomonas aeruginosa , Bacillus cereus and Enterococcus faecalis , in Raman mappings. Bacitracin improved sterilization efficiency of B-g-PAMDAC in four bacteria treatment in terms of sterilization rate and time. β-galactosidase and respiratory activity of bacteria revealed sterilization mechanism of B-g-PAMDAC that changed permeability of cell membrane before it reduced the respiration activity of bacteria and ruptured cell wall.
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Keding Li,Yuqing Lei,Jun Liao,Yong Zhang
Graphene oxide/locust bean gum (GO/LBG) aerogels, synthesized in an ice crystal template without using any chemical modifiers, were used for the treatment of water pollution. Various characterization results showed that GO/LBG aerogel exhibited a network-like three-dimensional (3D) structure with large specific surface area. The adsorption data revealed that GO/LBG aerogels with GO/LBG mass ratio of 1:4 (GO/LBG-1 aerogels) exhibited more prominent adsorption properties for Rhodamine-B (RhB, 514.5 mg g −1 ) than Indigo Carmine (IC, 134.6 mg g −1 ). Simultaneously, GO/LBG-1 aerogels could selectively remove RhB from a binary mixed solution of RhB-IC dyes. Furthermore, GO/LBG-1 aerogels also displayed excellent reusability and could still reach 92.4 % after ten cycles. Based on the above results, GO/LBG-1 aerogel could be considered as an ideal adsorbent with potential application value for removing water-soluble RhB from wastewater.
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LANGMUIR
·
2021
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IF 3.882
Yushuang Yang,Xiuping Chen,Yiming Li,Zichao Yin,Mutai Bao
Bio-based aerogels serve as potential materials in separation of oil/water mixtures. Nevertheless, there remain some key challenges, including expensive/toxic organic cross-linkers, unpromising reusability, and poor performance in emulsion separation. Hereby, a novel, robust, and superhydrophobic sodium alginate/graphene oxide/silicon oxide aerogel (SA/GO/SiO2-M) was fabricated by simple calcium ion cross-linking self-assembly, freeze-drying, and chemical vapor deposition methods based on the renewable and abundant raw materials. The as-prepared SA-based aerogel possesses high absorbency for varieties of organic solvents and oils. Importantly, it shows high efficiency in the separation of surfactant-stabilized water-in-oil emulsions. SA/GO/SiO2-M aerogels display excellent reusability in both absorption and separation because of their good mechanical properties in the air and oil phase, and the mechanism in emulsion separation is discussed. This study shows that SA/GO/SiO2-M aerogels are a promising material in treating oil contaminants from different fields.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Luyao Wei,Zhiquan Lu,Xiang Ji,Yike Jiang,Lan Ma
Hollow graphene oxide microcapsules (GOMs) have been widely used in energy, electronics, catalysis, sensing, tissue engineering, and drug loading due to their unique properties. However, it is still a great challenge to prepare GOMs with high quality and in large quantity using a simple method. In this work, we obtained single-component GOMs using the liquid nitrogen cavitation effect, which directed the self-assembly of graphene oxide (GO) debris at the gas–liquid interface. This method avoids the introduction of additional components and removal of templates. The morphology of GOM with wrinkles on its surface was characterized by transmission electron microscopy and scanning electron microscopy. The abundant polar groups of GO microcapsules enabled them to easily disperse in water. Based on this, GOMs have good potential for loading hydrophobic drugs. Subsequently, we used GOMs as carriers to deliver a hydrophobic drug paclitaxel (PTX), which exhibited a good loading capacity. Moreover, PTX loaded GOMs showed excellent cytotoxicity to A549 and MDA-MB-231 cells. The GOMs also showed a pH-dependent drug release performance. Therefore, GOMs can be regarded as potential carriers for biomedical applications.
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