APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Yong Zhang,Keding Li,Jun Liao
The multifunctional reduced-graphene-oxide/rare-earth-metal-oxide (RGO/REMO) aerogels with three-dimensional (3D) interconnected networks were fabricated through a facile one-step hydrothermal method and freeze-drying process. It was proved that REMO nanoparticles could be easily deposited on graphene sheets in gentle conditions. To further investigate the effect of REMO on the adsorption of dyes, RGO/Nd 2 O 3 , RGO/Pr 2 O 3 and RGO/Ce 2 O 3 aerogels were used to adsorb the Rhodamine-B (RhB). The RGO/REMO aerogels all exhibited high adsorption capacity for RhB and the maximal adsorption capacity was as high as 243.4 mg·g −1 . In particular, RGO/Ce 2 O 3 aerogel had a significant adsorption efficiency for RhB, and the adsorption capacity of RGO/Ce 2 O 3 aerogel for RhB reached 130.1 mg·g −1 only in one hour. Furthermore, as for RGO/Ce 2 O 3 aerogel, the removal-rate of RhB was still more than 92% after nine repeated regeneration. The excellent adsorption capacity and high repeated utilization rate of RGO/REMO aerogels indicated that the composite adsorbent possessed potential practical application in the treatment of wastewater containing RhB.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Nidhin Divakaran,Xu Zhang,Manoj B. Kale,T. Senthil,Suhail Mubarak,Duraisami Dhamodharan,Lixin Wu,Jianlei Wang
The constant urge to boost the versatility of unsaturated polyester (UP) in the burgeoning area of automotive and aircraft industries has shifted the focus on developing high performance UP based nanocomposites with remarkable thermal, mechanical, and electrical properties. The current work traverses through the innovative method to contrive functionalized graphene oxide (f-GO)/UP nanocomposites. Graphene oxide, synthesized from graphite using modified Hummers’ method, manifests into f-GO (GO-MAH and GO-NH 2 ) via surface chemical functionalization. Different loadings of f-GO were assimilated within UP matrix through in-situ polymerization. The comprehensive properties of the nanocomposites enhance, despite addition of f-GO as low as 0.04 wt%, which itself gives a scrupulous vindication of proper dispersion of fillers and formation of exfoliated and intercalated nanostructures, with SEM images furnishing the inference of meticulous dispersion. The fabricated nanocomposites exhibit tensile strength augmentation by 75.2% for ultralow content of 0.08 wt% f-GO. Furthermore, the 0.10 wt% addition of f-GO within UP displays 53.8% increase in storage modulus and thermal decomposition temperature at 10% mass loss boosts by 70.3 °C, while the electrical conductivity surges by 10 9 S/m. The surface functionalized graphene oxide and their interaction with UP played a vital role in their property enhancement.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 95
·期 3
·639-648
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IF 2.659
Zirong Luo,Dandan Li,Shaozao Tan,Langhuan Huang
BACKGROUND Oil spills from oil tankers and ships or industrial accidents have serious impacts on the ecological environment. There is an urgent need for finding effective ways to resolve these problems. The use of low-cost and efficient adsorbents is considered to be one of the most effective ways. RESULTS In this study, an ultra-light 3D kapok fiber-reduced graphene oxide (TKF-rGO) aerogel was prepared by a simple and green one-step hydrothermal method. The kapok fiber used as skeleton was embedded in a graphene network to successfully form a 3D aerogel structure. The as-prepared TKF-rGO aerogel featured low density, excellent mechanical strength, high thermal stability, and high hydrophobic lipophilicity. Furthermore, continuous oil–water separation could be achieved by the aerogel when connected to a vacuum system. The adsorption capacity of TKF-rGO aerogel for various common oil products and organic solvents was 1.5-fold greater than that of pure rGO aerogel and six-fold greater than that of polypropylene melt spray, respectively. In addition, the initial adsorption capacity of the as-prepared TKF-rGO aerogel was maintained at 94% after eight cycles. CONCLUSION The TKF-rGO aerogel could be synthesized by a low-cost and green method, which was suitable for commercial production, and showed competitive adsorption capacities for oil removal. Thus, the TKF-rGO aerogel is expected to be employed as a promising adsorbent in the removal of oil spill or hazardous organic solvents from water. © 2019 Society of Chemical Industry
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POLYMER INTERNATIONAL
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2019
·Vol. 69
·期 4
·346-354
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IF 2.433
Weilong Chen,Kun Wu,Zhiyou Tan,Mangeng Lu
Interfacial thermal resistance between matrix and filler is one of the most serious factors hindering heat transfer in composites. Here, a type of liquid crystalline polyester (LCP) containing phenyl pendant groups was intended to blend with pristine graphite by interfacial interaction. The intensity at 26.6° of the wide angle X-ray diffraction pattern which exceeded that of pristine graphite indicated the existence of a strong interfacial π–π interaction. Both DSC and XRD tests showed that the ordered structure of the LCP matrix is directly affected by the mass fraction of graphite, indicating the interfacial interaction between LCP and graphite. By increasing the content of graphite, the thermal diffusivity showed a sharp increment by 1004%. The maximum thermal conductivity of the composite reached 28.613 W m −1 K −1 , which was seven times that of traditional thermoplastic blended with graphite. Compared with the data calculated using effective medium theory, interfacial interaction plays a significant role in enhancing the thermal conductivity of the composites. Furthermore, the maximum tensile strength of this series of composites reached 13.3 MPa and the maximum Young's modulus reached 1067 MPa, exhibiting a potential guideline for further applications in flexible electronics. © 2019 Society of Chemical Industry
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RSC Advances
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2019
·Vol. 9
·期 68
·39958-39964
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IF 3.049
Xinxiu Wu,Fangfang Niu,Ao Zhong,Fei Han,Yun Chen,Jinhui Li,Guoping Zhang,Rong Sun,Ching-Ping Wong
Flexible strain sensors possess a great potential for applications in wearable electronic devices for human motion detection, health monitoring, implantable medical devices and so on. However, the development of highly sensitive strain sensors remains a challenge in the field of wearable electronics. Herein, we prepared a highly sensitive strain sensor, which was composed of a three-dimensional reduced graphene oxide foam decorated with silver nanoparticles (Ag NPs) to enhance the conductivity. Then, half-cured polydimethylsiloxane was employed to get a special “hollow packaged” structure. Thanks to the synergistic conductive effect of Ag NPs and the reduced graphene oxide flakes as well as the special “hollow packaged” structure, the as-prepared flexible strain sensor not only possessed a dramatic gauge factor of 1588 (at 50% sensing strain), but also exhibited high stability in 500 cycles of 30% strain. The mechanism of the enhancement of the sensitivity with the special “hollow packaged” structure was discussed as well. Meanwhile, the detection of the bending and rotation of wrists and the bending of fingers and arms was demonstrated, showing attractiveness in human motion detection.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2019
·
IF 3.372
Chang Li,Jie Lin,Liming Shen,Ningzhong Bao
Ultrasonic exfoliation is the most widely used delamination technique for producing graphene oxide. In this work, the exfoliation of graphite oxide suspension is conveniently monitored via real-time measurement of viscosity and then quantitatively described by using the relative single-layer fraction ( α ) for the first time, by which the full exfoliation is achieved with a time scale of minutes. Lateral size evolution is demonstrated using lognormal distribution based on statistical analysis. With the quantization of relative single-layer fraction and lateral size distribution, a prototype database has been built to efficiently integrate experimental data tested under different process conditions (suspension concentration, ultrasonic frequency, and ultrasonic power density), which can be used as reference guides for process optimization and product control. The selection and breakage functions ( S i and B ij ) of ultrasound-assisted exfoliation are calculated and the breakage mechanisms of graphite oxide are found attributed mainly to sheet fracture.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 12
·7871-7878
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IF 1.093
Zhang Qiang,Yang Ping,Shen Jianxing,Yu Jinghua
Graphene/CdS composites were synthesized through the direct deposition of CdS nanoparticles on graphene sheets. The high conductivity of graphene sheets and the intimate heterointerfacial connection between graphene sheets and CdS nanoparticles provided prominent advantages for enhancing
light absorption and facilitating the transfer of photogenerated carriers from CdS nanoparticles, thus leading to an effectively separation of electron–hole pairs and consequently an improvement in photocurrent intensity. A highly sensitive and selective photoelectrochemical sensor for
detecting copper ions (Cu2+) was developed based on the interaction between Cu2+ and CdS by forming Cu
x
S-coated CdS nanoparticles, which serves as the recombination centers, impedes the transfer of electron from the conduction band of CdS to graphene
sheets, and consequently leads to a decrease in photocurrent intensity. The sheets not only effectively transferred the photogenerated electrons deriving from CdS nanoparticles but also resulted in an enhancement in photocurrent intensity in the presence of various metal ions except Cu2+.
The sheets amplified the photoelectric response of CdS semiconductor for Cu2+ sensing, in which the photocurrent intensity decreased dramatically.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 95
·期 4
·1116-1125
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IF 2.659
Han Zhang,Shao-Feng Hua,Lei Zhang
BACKGROUND The objective of this research was to use a step-by-step method to prepare a novel biocatalytic system (GO-CEL-E/N-GA-GOD): -OH and -COOH on the surface of graphene oxide (GO) were used to immobilize cellulase (CEL) and glucose oxidase (GOD), respectively, which may be easier to control the loading of enzymes with different kinds, to achieve the one-pot conversion of gluconic acid from carboxymethyl cellulose (CMC). RESULTS The loadings capability of CEL and GOD on GO-CEL-E/N-GA-GOD were 49.07 ± 7.47 mg g −1 and 10.22 ± 2.03 mg g −1 , respectively. The multi-enzyme systems had shallow temperature and pH optima of 40 °C and 5.0. The kinetic constants of GO-CEL-E/N-GA-GOD (of CEL-GOD) were K m = 0.15 ± 0.02 (0.43 ± 0.09) mmol L −1 , V max = 0.18 ± 0.01 (0.21 ± 0.07) μmol L −1 s −1 , and k cat / K m = 24.12 ± 0.52 (17.74 ± 0.85) s −1 mmol −1 L. Nearly 65% of the initial activity of GO-CEL-E/N-GA-GOD could be retained after seven cycles. Notably the conversion of gluconic acid was able to reach 63.82 ± 8.03% within 2 h. CONCLUSION Step-by-step immobilization method made full use of different functional groups on GO, avoiding the competition for fixed sites between CEL and GOD in the immobilization processes. The results reflected the feasibility of the strategy to build bio-microsystem as CEL and GOD immobilized on GO by covalent bonds to achieve the conversion from CMC to gluconic acid in one-step. © 2019 Society of Chemical Industry
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Shiyu Liu,Rongchang Wang,Cuixiang Ma,Dianhai Yang,Duanxin Li,Zbigniew Lewandowski
Oxygen and reactive oxygen species (ROS) produced during algal photosynthesis are important electron acceptors in photosynthetic algal microbial fuel cell (PAMFC) cathodes. In this study, spongy and petaline ZnO– [email protected] carbon felt cathodes were first fabricated through in situ ZnO–NiO growth and further modified with reduced graphene oxide (rGO) via electrodeposition and cyclic voltammetry reduction. The structural and electrochemical properties of the ZnO– [email protected] carbon felt cathodes were characterized, and the ROS adsorption capacity of the cathodes was analyzed via temperature programmed desorption and UV spectrophotometry. The results illustrated that the optimal molar ratio of Zn to Ni was 0.2 for cathode surface modification, and the specific surface areas of spongy and petaline ZnO 0.2 – [email protected] reached 215.26 and 230.88 mg·g −1 , respectively, which were more than 200-fold higher than that of prefabricated carbon felt. The areal capacitance values of spongy and petaline ZnO 0.2 – [email protected] cathodes reached 3033.5 and 6388.92 mC·cm −2 , respectively. The ROS concentrations on the spongy and petaline ZnO 0.2 – [email protected] cathode surfaces reached 52.36 and 64.02 μmol·L −1 , respectively, which were nearly 2-fold higher than that for prefabricated carbon felt cathode. The power densities of PAMFCs using spongy and petaline ZnO 0.2 – [email protected] as cathode electrodes were 20.18 and 31.92 mW·m −2 , respectively. The improvement of electrochemical performance of PAMFCs is partially ascribed to the enhanced ROS adsorption capacity of ZnO– [email protected] cathodes. Therefore, ROS adsorption capacity is recommended as an evaluation indicator for PAMFC cathodes.
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JOURNAL OF FOOD SCIENCE
·
2019
·Vol. 84
·期 12
·3624-3633
·
IF 2.081
Chunyan Tu,Yinan Guo,Yuanyuan Dai,Wei Wei,Weiping Wang,Liang Wu,Aijun Wang
An aptamer-functionalized Fe 3 O 4 /graphene oxide was synthesized by chemical co-precipitation method and then employed in the magnetic solid-phase extraction for selective enrichment of chloramphenicol before HPLC. The aptamer was covalently bonded to the Fe 3 O 4 /graphene oxide complex by 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride and N -hydroxysuccinimide. Parameters affecting extraction efficiency including solution pH, extraction time and temperature, types and volume of elution solvent, and elution time were investigated in detail. Under the optimal conditions, good linearity was obtained between the peak area and analyte concentration in the range of 7.0 to 1.0 × 10 3 µg/L with the correlation coefficient of 0.9994. The limit of detection and quantitation were 0.24 µg/L and 0.79 µg/L, respectively. The developed method was employed to the analysis of chloramphenicol in honey and milk samples. The recoveries ranged from 80.5% to 105.0% with relative standard deviations less than 8.9%. Practical Application An aptamer-functionalized Fe 3 O 4 /graphene oxide was synthesized and employed in magnetic solid phase extraction for the enrichment of chloramphenicol before HPLC. The presented assay was employed for the determination of chloramphenicol in honey and milk with satisfactory results.
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高影响因子
JOURNAL OF POLYMER RESEARCH
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2019
·Vol. 26
·期 12
·1-12
·
IF 1.53
Li Ting,Liu Xiaojin,Li Luzhong,Wang Yang,Ma Piming,Chen Mingqing,Dong Weifu
Polydopamine-Functionalized graphene oxide (PDA-GO) was used to form Polyvinyl Alcohol/Chitosan/PDA-GO (PVA/CS/PDA-GO) hydrogels. FTIR, TGA and SEM investigation showed that PDA had been successfully loaded on graphene oxide nanosheets. Adsorption of metal ions onto the novel PVA/CS/PDA-GO hydrogel beads with variations in pH, contact time, initial metal concentration and temperature had been investigated. Adsorption data were well accurately described by Langmuir isotherm and pseudo-second-order kinetic model at the optimum pH 5.5. The maximum adsorption capacities of the PVA/CS/PDA-GO were 210.94 mg·g −1 , 236.20 mg·g −1 and 214.98 mg·g −1 for Cu(II), Pb(II) and Cd(II) ions with 40 C, respectively. Meanwhile, desorption efficiency and reusability of the adsorbents were assessed on basis of six consecutive adsorption-desorption cycles. This work provides a simple and environmentally friendly method to obtain the PVA/CS/PDA-GO hydrogel beads, which really would be a potential recyclable adsorbent for removal of hazardous metal ions in waste water.
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Journal of Materials Research and Technology-JMR&T
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2019
·
IF 3.327
Xin Wang,Shibin Nie,Ping Zhang,Lei Song,Yuan Hu
A facile approach to preparing functionalized graphene aerogels (FGAs) with superhydrophobic and superoleophilic properties was developed by modifying graphene aerogels with poly(dimethylsiloxane) (PDMS). The as-prepared FGAs displayed mesoporous structure with a high aspect surface area (157 m 2 /g), which afforded a high adsorption capacity toward various organic solvents with a remarkable value of 48–96 g/g. In addition, the resultant FGAs also exhibited a high separation efficiency (≥99%), ultrafast removal (a few seconds), and good recycling performance (10 cycles, 99% retention) toward multiple hazardous organics (chloroform, dichloromethane, n-hexane, toluene, petroleum ether, etc.) in water. These findings provide a promising material to improve the removal efficiency of hazardous organics for water purification.
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