Science Bulletin
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2016
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IF 0
Lidan Xu,Min Hong,Yongliang Wang,Ming Li,Haibo Li,Madhavan P.N. Nair,Chen-Zhong Li
In this work, we demonstrated a simple and efficacious two-step method for the synthesis of Ag@Au core–shell nanoparticles (Ag@AuNPs) and the Ag/Au hollow nanocages (Ag/AuNCs) with Ag nanoparticles (AgNPs) as seeds by adjusting pH, and the preparation of hybrid Ag@AuNPs- or Ag/AuNCs-graphene oxide nanocomposites (Ag@AuNPs-GO or Ag/AuNCs-GO) based on the self-assembly. It was noticed from the electrostatic assembly experiment that the loading amount of Ag/AuNCs on GO nanosheet was more than that of Ag@AuNPs. The as-synthesized hybrid materials were characterized by transmission electron microscopy , atomic force microscopy , ζ-potential, high-angle annular dark-field scanning transmission electron microscopy, thermogravimetric analyzer and X-ray diffraction. Catalytic activities of Ag@AuNPs, Ag/AuNCs and Ag/AuNCs-GO nanostructures were investigated in the reduction of 4-, 3- or 2-nitrophenol to 4-, 3- or 2-aminophenol, and on the basis of comparative kinetic studies the following trend was obtained for the related catalytic activity: Ag/AuNCs-GO > Ag/AuNCs > Ag@AuNPs. These observations were attributed to the simultaneous effects of surface area available for catalytic reaction and composition of the hybrid nanostructures.
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Journal of Cleaner Production
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2021
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IF 9.297
Zijie Wang,Yannan Jia,Weikun Song,Xiaoqin Li,Kai Xu,Zheng Wang
The removal of boron in desalinated seawater has always been one of the keys to restrict the use of desalinated seawater. For this reason, a composite adsorbent named UiO-66-NH 2 /GO was successfully prepared by a simple solvothermal method through this research. It is composed of graphene oxide and water-stable metal organic framework UiO-66-NH 2 , and for the first time as a boron adsorbent for the treatment of desalinated seawater. Various technologies were applied to systematically analyze the stability, structure, topography and chemical characteristics of the composite adsorbent. The relationship between the influencing factors and the adsorption effect was investigated, including the amount of adsorbent, contact time, initial concentration of boron, and pH of the boron solution. It is proved that the boron adsorption complies the pseudo-second-order kinetic model , the intra-particle diffusion model and the Langmuir isotherm model through the fitting of experimental results. The adsorption of boron by UiO-66-NH 2 /GO has both physical and chemical adsorption , including electrostatic attraction , covalent bond or electron transfer . The results of thermodynamic study pointed out the adsorption of boron is spontaneous and feasible. The response surface method was designed to improve the adsorption conditions of boron. The optimized adsorption conditions to reach 26.45 mg/g of boron adsorption were found to be at dosage of 75.03 mg/g with pH of 5 and temperature of 321.19 k. UiO-66-NH 2 /GO showed good removal ability for low concentration boron and good reusability . The above suggest that UiO-66-NH 2 /GO has the potential to be applied to desalinated seawater treatment.
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高影响因子
Analytical Methods
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2021
·Vol. 13
·期 15
·1832-1838
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IF 2.896
Jiaxi Cheng,Fenghua Jiang,Siqi Zhang
Herein, an ultrasensitive and selective nanofluidic device for tetracycline (TC) was developed in association with γ-cyclodextrin and graphene oxide (GO). The assay was designed based on the change of the nanochannel surface charge due to the selective recognition ability of GO between aptamers and TC–aptamer complexes. And γ-cyclodextrin was utilized to eliminate the excess TC since the amine group molecules were inclined to be adsorbed onto the nanochannel surface and affected the adsorption efficiency of the nanochannel. In the presence of TC, TC specifically binded to the aptamer to form TC–aptamer and was separated from GO. The TC–aptamer complexes could be quantitated with conical nanochannels coated with polyethyleneimine (PEI)/Zr4+. The redundant TC was removed by γ-cyclodextrin. The detection limit of the nanofluidic device was as low as 2 ng L−1 (S/N = 3) and the linear range was 10 ng L−1 to 10 μg L−1. Moreover, the nanofluidic device provided high specificity and good recovery rates of 94.8–109.3% in natural river, tapwater and wastewater samples. The results revealed that our study provided a new rapid detection method for trace contaminant analysis.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Lili Kong,Jie Chen,Meizhen Huang
In this paper, we have developed a graphene oxide/Au@Ag nanobones membrane (GO/Au@Ag NBs membrane) for simultaneous enrichment and SERS detection of colorants in beverages. Raman enhancement effect of Au@Ag nanobones (NBs) and enrichment capability of graphene oxide (GO) are contributed to the high sensitivity of GO/Au@Ag NBs membrane. Microporous membrane provides a support template for uniformly loading high-density GO/Au@Ag NBs. When beverage flow through the portable filtration unit with GO/Au@Ag NBs membrane, colorant molecules could be efficiently enriched. The prepared GO/Au@Ag NBs membrane exhibits an excellent sensitivity with a LOD of Rhodamine 6 G at 1.12 × 10 −9 mol/L, and has good performances of uniformity (with an RSD of 7.87 %), repeatability (with an RSD of 10.44 %), time stability (stored up to 60 days). Six types of colorants were sensitively detected combined with GO/Au@Ag NBs membranes, portable filtration unit and self-development portable Raman system. The lowest distinguished amounts of molecular accumulation are well below the maximum usage limits and the limits of visual recognition. Support vector machine model was established to identify the types of colorants, including colorants with coincident Raman peaks or similar visual colors, with an average accuracy of 94.8 %. In addition, GO/Au@Ag NBs membranes were used to enrich and detect colorant additives in commercial beverages, brilliant blue in energy beverage and carmine in bayberry wine were successfully detected. These results indicate GO/Au@Ag NBs membranes combined with a portable filtration unit can effectively enrich and rapidly detect colorants in beverages, and has great potential in the field of on-site and sensitive food safety detection.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jing Pan,Shaobin Li,Fengbo Li,Tingting Yu,Yupeng Liu,Li Zhang,Lin Ma,Ming Sun,Xuefeng Tian
Metal-organic frameworks (MOFs)-based derivatives provide a flexible platform for constructing high performance supercapacitors as electrode materials. Herein, a novel NiFe 2 O 4 /NiCo 2 O 4 /GO composites has been successfully prepared by dual-MOF as precursor. The NiFe 2 O 4 /NiCo 2 O 4 /GO composite formed a special structural morphology providing a large surface area. The composite electrode material exhibited an excellent specific capacity of 661.6 C/g (1470 F/g) at 1 A/g, excellent rate capability (from 1 to 20 A/g the specific capacity decreases about 38 %) and outstanding long cyclic life (89.9 % capacity retention after 3000 cycles). Moreover, an asymmetric supercapacitor was composed of NiFe 2 O 4 /NiCo 2 O 4 /GO and activated carbon as positive electrode and negative electrode, respectively. Meanwhile, ASC exhibited a specific capacity of 373.3 C/g at 1A/g in a potential range from 0 to 1.45 V, it showed the maximum energy density of ASC equal to 109 Wh kg −1 at a power density of 1051.17 W kg −1 . In addition, the NiFe 2 O 4 /NiCo 2 O 4 /GO//AC has an outstanding cycling stability (90.7 % capacitance retention after 1000 cycles), which makes it a potential application for in the field of energy storage-conversion application.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Ning Zhang,Wenxu Qi,Lili Huang,En Jiang,Zhiying Li,Yang Luo,Xiaopeng Zhang,Junjiang Bao,Wenji Zheng,Gaohong He
There has been an increasing focus on the application of graphene oxide (GO) composite membrane in water treatment. For long-term operation in aqueous solutions, the diamine cross-linkers are widely used to stabilize the GO laminates on the supporting substrate. Polysulfone (PSf) is a superior candidate to support the GO laminates due to its highly chemical, mechanical and thermal stability, but its lack of active sites for cross-linking reaction leads to the easy exfoliation of the GO laminates from the PSf surface within a few hours. In this work, we report a novel fabrication approach to obtain a composite membrane with semi-interpenetrating network of cross-linked GO film in the PSf substrate coupled with a high hydration stability in the application of water treatment. The hydration swelling has little effect on the water permeability and dye rejection. The GO composite membrane exhibits excellent structure stability in water, acid, and alkaline solutions for several days or even longer. Such membranes show comparable water flux with the pristine GO composite membranes, and nearly complete rejection to dyes (i.e. methyl orange, methylene blue, congo red and reactive green). This work provides a novel and facile strategy for the fabrication of structure-enhanced GO composite membrane highly promising for practical applications.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Guibin Lou,Lida Shen,Yingjuan Qian,Ya Chen,Huawen Bai,Haixia Cheng,Junwei Xu,Youwen Yang
This work studies the antibacterial and anti-corrosion properties of nickel-graphene oxide (Ni-GO) composite coating and nickel-reduced graphene oxide (Ni-rGO) composite coating deposited by magnetic field assisted scanning jet electrodeposition on manganese steel . Agar plate assessment and cell live/dead staining were used to evaluate the antibacterial property of the two types of composite coatings. The Ni-GO and Ni-rGO composite coatings can effectively improve the antibacterial property of the substrate. The Ni-GO composite coating deposited with graphene oxide (GO) concentration of 0.5 g/L showed the most excellent antibacterial ability, and its antibacterial rate against E. coli and S. aureus within 2 h were 100% and 93%, respectively. Potentiodynamic polarization measurements indicated that the protective efficiency of the two types of composite coatings on the manganese steel reaches 99% after being immersed in 3.5 wt% NaCl solution for 7 days. The combined effect of barrier protection from GO-based materials (GO, rGO) and corrosion products effectively inhibits the corrosion behavior of the two types of composite coatings.
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高影响因子
Catalysts
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2021
·Vol. 11
·期 8
·888
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IF 4.146
Jingzhen Wang,Kaijie Mu,Xuedong Zhao,Dianliang Luo,Xiaodi Yu,Wenpeng Li,Jie Chu,Jing Yang,Qinzheng Yang
Metal, as a high-performance electrode catalyst, is a research hotspot in the construction of a high-performance microbial fuel cell (MFC). However, metal catalyst nanoparticles and their dispersed carriers are prone to aggregation, producing catalytic electrodes with inferior qualities. In this study, Pd is uniformly dispersed on the graphene framework supported by carbon black to form nanocomposite catalysts (Pd/GO-C catalysts). The effect of the palladium loading amount in the catalyst on the catalytic performance of the air cathode was further studied. The optimized metal loading afforded a reduced resistance and improved accessibility of Pd particles for the ORR. The maximum current output of the 0.250 Pd (mg/cm2) MFC was 1645 mA/m2, which is 4.2-fold higher than that of the carbon paper cathode. Overall, our findings provide a novel protocol for the preparation of high-efficient ORR catalyst for MFCs.Keywords:oxygen reduction reaction;microbial fuel cell;air cathode
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高影响因子
MATERIALS LETTERS
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2021
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IF 3.423
Wenbo Liu,Jiabin Zhou,Dan Liu,Su Liu,Xianjie Liu
Accelerating electron transfer can improve the catalytic performance. MIL-88/Go composites were synthesized by hydrothermal method using the oxygen-containing functional group of graphene oxide (GO) as the MIL-88 unit cell nucleus. Fe 2 O 3 /rGO composites with small particle size were prepared by roasting of MIL-88/GO. It has high degradation efficiency (99%) and good recycling performance for tetracycline hydrochloride (TC-HCl) in photo-Fenton system. The combination of oxygen vacancies produced by roasting MIL-88 and the conductivity of reduced graphene oxide (rGO) improves the rate of electron transfer. The efficient electron transfer promotes the formation of OH and O 2 − and thus improve the catalytic activity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Jiafeng He,Gao Song,Xinyue Wang,Ling Zhou,Jumei Li
It is greatly significant to remove organic dyes and antibiotics in water because they are extremely harmful for human health and environment. In this work, we successfully developed magnetic Fe 3 O 4 /GO/Ag composite microspheres, using Fe 3 O 4 microspheres as cores to wrap graphene oxide (GO) interlayer and further in situ depositing silver nanoparticles onto GO layer. The microspheres were characterized by SEM, XRD , XPS and Raman spectroscopy . As compared to Fe 3 O 4 /Ag microspheres, Fe 3 O 4 /GO/Ag composite microspheres displayed higher activity for SERS detection, and also catalytic reaction due to the synergistic interaction of GO nanosheets and Ag nanoparticles. Subsequently, the Fe 3 O 4 /GO/Ag composite microspheres were employed to quantitatively detect aromatic molecules, methylene blue (MB) in aqueous solution, showing the limit of detection was low down to 10 −9 M and the correlation coefficients (R 2 ) of the linear relationship between SERS intensities and logarithmic concentrations was high up to 0.91. Moreover, the Fe 3 O 4 /GO/Ag composite microspheres as catalysts completely degraded methylene blue and ciprofloxacin in 12 min with the presence of NaBH 4 . Finally, Fe 3 O 4 /GO/Ag composite microspheres were utilized to effectively follow the degradation reaction process of MB by SERS. Taken together, Fe 3 O 4 /GO/Ag composite microspheres present SERS application potentials in terms of trace and quantitative detection of chemicals, and in-situ monitoring catalytic degradation of organic pollutants.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2019
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IF 3.714
Jiadi Sun,Wei Guo,Jian Ji,Zaijun Li,Xiao Yuan,Fuwei Pi,Yinzhi Zhang,Xiulan Sun
As a kind of mycotoxins , patulin has been a usual contamination in apple juice and causes a serious public health concern nowadays. Regarding this issue, a novel and effective adsorbent, Fe 3 O 4 @SiO 2 @CS-GO@MIP, is designed to remove the patulin from apple juice. Firstly, the molecularly imprinted polymer (MIP) was prepared by surface imprinting technique. Meanwhile, addition of Fe 3 O 4 makes the final prepared MIP adsorbent magnetic, which is beneficial for separating the adsorbent from the food matrix. Moreover, chitosan (CS) and SiO 2 improve the biocompatibility, stability and dispersibility of the MIP adsorbent effectively. As for the adsorption performance, batches of experiments were conducted on the proposed adsorbent. Experimental results showed that the adsorption process followed pseudo-second-order kinetic and Freundlich isotherm model, and the physical multi-molecular layer endothermic adsorption happened during the whole adsorption process. Adsorption capacity of the proposed adsorbent is 7.11 mg/g maximumly, and over 90% of the total patulin in apple juice being removed after 24 h. Besides, the proposed adsorbent has distinguishing characteristics, including large specific surface area with BET reaching 279.6 m 2 /g, high cell viability of 79.77% and no negative effects on final quality parameters. The desirable adsorption performance and characteristics make Fe 3 O 4 @SiO 2 @CS-GO@MIP a promising adsorbent for removing the patulin from apple juice in the future.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Jue Zhang,Zhenqiang Shi,Chao He,Xin Song,Ye Yang,Shudong Sun,Weifeng Zhao,Changsheng Zhao
Adsorbents are usually used to remove uremic toxins for blood purification. However, the removal of urea is still an intractable problem, since no effective material has been found for urea removal by physical adsorption. Here, urease immobilized graphene oxide core@shell heparin-mimicking polymer (U-GO-HMP) beads were designed, which exhibited good urea removal ability with a removal amount of about 635 mg/g and a removal ratio of about 80% from urea solution. In addition, urea could be removed from collected dialysate and the removal ratio could reach 60% within 480 min. Beyond that, the U-GO-HMP beads also showed good reusability with sustainable relative activity after 5 cycles. Furthermore, the U-GO-HMP beads exhibited good blood compatibility with low hemolysis ratio, suppressed complement activation and contact activation, as well as increased clotting times. It is worthy believing that the U-GO-HMP beads may have great potential in the field of blood purification for urea removal.
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PubMed
高影响因子
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