Materials Science & Engineering C-Materials for Biological Applications
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2020
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IF 5.88
Chengke Wu,Jing Li,Xiaoya Liu,Huijie Zhang,Ruifeng Li,Gongke Wang,Zhenhui Wang,Quanmin Li,Enbo Shangguan
For this study, three novel types of sensors comprised of CoAl-layered double oxyhydroxide (CoAl-LDH), CoAl-LDH/reduced graphene oxide (rGO), and CoAl-OOH/rGO nanosheets were successfully fabricated on glassy carbon electrodes (GCEs) and employed for the electrochemical detection of epinephrine (EP) and acetaminophen (AC). Interestingly, we found that the CoAl-OOH/rGO/GCE was more suitable for the determination of EP and AC in contrast to the CoAl-LDH and CoAl-OOH/rGO sensors. Differential pulse voltammetry results revealed that the CoAl-OOH/rGO/GCE delivered excellent electrocatalytic activity. The sensitivities and detection limits for the simultaneous measurement of EP and AC were 12.2 μA μM −1 cm −2 , 0.023 μM L −1 , and 4.87 μA μM −1 cm −2 , 0.058 μM L −1 , respectively. Especially, the as-obtained CoAl-OOH/rGO/GCE was successfully utilized for the detection in pharmaceutical samples and biological fluids with satisfactory results. Owing to its outstanding electrocatalytic activity and superior sensitivity, the CoAl-OOH/rGO/GCE could be beneficial to construct a promising electrochemical sensor for the detection of EP and AC.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2020
·Vol. 44
·期 2
·343-353
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IF 2.419
Jiaojiao Xia,Pengyun Wang,Bin Zou,Onyinye Adesanya Idowu
Abstract Catechol level is an important indicator for evaluating the quality of tea. Therefore, the exploration of a simple and efficient quantitative detection method for catechol has an important significance. In this study, functionalized graphene oxide was synthesized by chemically modifying the surface of graphene oxide. The prepared carrier was covalently combined with biomimetic oxidase iron porphyrin (FePP, the active center of horseradish peroxidase). Ionic liquid as covalent coupling agents was designed as electronic bridge between biomimetic oxidase and graphene oxide. The novel biomimetic biosensor provided a detection range of 50.0–1600.0 μmol/L by modulating under the optimal conditions of the reaction system (FePP concentration is 1.5 × 10 –3 mol/L, pH 3.0, Nafion solution dosage 1% and temperature 25 °C), the detection limit is 0.09 μmol/L. The biosensor has excellent stability, repeatability and reproducibility, and is expected to be applied to the rapid detection of catechol in actual tea sample.. Graphic abstract
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Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Yuqi Wang,Jian Pan,Yanhui Li,Pengfei Zhang,Meixiu Li,Heng Zheng,Xiaoping Zhang,Hong Li,Qiuju Du
Three adsorbents, trichosanthes kirilowii maxim shell activated carbon (TKAC), nickel alginate/activated carbon (NA/AC) aerogel and nickel alginate/graphene oxide (NA/GO) aerogel were prepared in the present study. The three-dimensional network structure of the NA/AC aerogel and NA/GO aerogel was found to effectively control the dispersion state of TKAC and GO. The adsorption behavior was systematically investigated in terms of adsorption temperature and time, initial adsorbate pH and concentration, as well as the dose of adsorbents. The methylene blue (MB) adsorption process of TKAC was in accordance with the Langmuir isotherm model and followed a pseudo-second order mechanism. The adsorbing capacity of TKAC was 505.050 mg/g at 303 K while the BET surface area was 349.400 m 2 /g. Thermodynamic analysis demonstrated the spontaneous and endothermic properties of the entire adsorption process. The MB adsorption of the NA/AC aerogel satisfied the Langmuir isotherm and Freundlich isotherm models. Moreover, the MB adsorption on the NA/AC aerogel followed a pseudo-second order mechanism. The adsorbing capacity of the NA/AC aerogel was observed to be 465.120 mg/g at 303 K while the BET surface area was 100.690 m 2 /g. Thermodynamic investigation demonstrated a spontaneous and exothermic nature of the overall adsorption process. The MB adsorption of the NA/GO aerogel aligned with the Langmuir isotherm model and followed pseudo-second order mechanism. The adsorbing capacity of NA/GO aerogel was found to be 537.630 mg/g at 303 K, while the BET surface area was 5.050 m 2 /g. Furthermore, thermodynamic studies exhibited spontaneous and exothermic properties of the entire adsorption process.
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Journal of Energy Chemistry
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2020
·
IF 7.216
Shan-Shan Fan,Ling Shen,Yuan Dong,Ge Tian,Si-Ming Wu,Gang-Gang Chang,Christoph Janiak,Ping Wei,Jin-Song Wu,Xiao-Yu Yang
Three-dimensional (3D) hybrid of nanocarbons is a very promising way to the high-performance design of electrocatalysis materials. However, sp 3 -like defect structure, a combination of high strength and conduction of graphene and carbon nanotubes (CNTs) is rarely reported. Herein, 3D neural-like hybrids of graphene (from reduced graphene oxide) and carbon nanotubes (CNTs) have been integrated via sp 3 -like defect structure by a hydrothermal approach. The sp 3 -like defect structure endows 3D nanocarbon hybrids with an enhanced carrier transfer, high structural stability, and electrocatalytic durability. The neural-like structure is shown to demonstrate a cascade effect of charges and significant performances regarding bio-electrocatalysis and lithium-sulfur energy storage. The concept and mechanism of “ sp 3 -like defect structure” are proposed at an atomic/nanoscale to clarify the generation of rational structure as well as the cascade electron transfer.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Weidong Cheng,Hailiu He,Xiaoxu Liu,Yanfen Liu,Zhuanfang Zhang,Shuhua Li,Rong Zhang,XiuXiu Wang,Zhonghua Wu,Zhaojun Wu
Nanostructure of CuO plays a critical role in Li-ion battery (LIB) applications of CuO/graphene oxide (GO) nanocomposites. Morphological evolution of CuO/GO anode material provides essential information for developing the performance of LIBs. But, the nanostructural evolution of the CuO/GO anode materials have not been previously studied by in situ electrochemical-synchrotron radiation techniques. In this paper, different CuO morphology in preparation of CuO/GO nanocomposites could be controlled by increasing the reactive time at 83 °C. In situ synchrotron X-ray diffraction and small angle X-ray scattering (SAXS) are employed to characterize the structural behavior of CuO/GO samples during the first cycle. The CuO(-511) Bragg peak demonstrates a more significant shift toward higher angles due to the incorporation of Li + in the CuO crystal lattice . SAXS indicates that the formation and growth of SEI are observed with lithiation dose, and subsequently some cracks occur. The in situ electrochemical-synchrotron techniques could be implemented to help further understand the electrochemical behaviors and conversion mechanism of anode materials.
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Nanomaterials
·
2020
·Vol. 10
·期 12
·2449
·
IF 4.324
Shiliang Heng,Lei Li,Weiwei Li,Haiyan Li,Jingyu Pang,Mengzhen Zhang,Yan Bai,Dongbin Dang
The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6= K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2evolution activity without any co-catalyst. The rate of 1038 µmol g−1in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2production.Keywords:polyoxoniobate;Nb6/PPy-RGO composites;electronic bridge;H2production
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
·
IF 4.551
Niu Liu,Jun Cheng,Wen Hou,Xiao Yang,Junhu Zhou
In order to form strengthened active sites for superior CO 2 adsorption on core shell ZIF-8@ZIF-67 nanocomposites , graphene oxide (GO) with oxygen-containing functional groups was used as support to synthesize hybrid adsorbents with unsaturated Zn–N 2 –O active sites. The results of XPS O 1s and FTIR analysis revealed that the Me–O functional group content in the 0.5 wt% graphene oxide (GO)-supported core shell ZIF-8@ZIF-67 nanocomposite (38.9 at.%) was much higher than that in the 0.5 wt% reduced graphene oxide (RGO)-supported nanocomposite (19.4 at.%). This was because hydroxyl functional groups in the GO formed coordination bonds with zinc atoms in core shell ZIF-8@ZIF-67. XPS N 1s spectra indicated that the incorporation of oxygen-containing functional groups in GO resulted in the transition of binding form from Me–N 4 to Me–N 2 . The CO 2 adsorption capacity of GO-supported core shell ZIF-8@ZIF-67 gradually decreased from 2.15 to 1.30 mmol/g as GO weight percentage increased from 0.5 to 4 wt%, which was consistent with the decrease in BET surface area from 1378 to 585 m 2 /g and increase in peak pore diameter from 7.7 to 8.2 Å. Density functional theory (DFT) calculations demonstrated that unsaturated Zn–N 2 –O active sites in GO-supported core shell ZIF-8@ZIF-67 nanocomposites resulted in a decreased O C⋯Zn interaction distance from 4.65 (Zn–N 4 sites in core shell ZIF-8@ZIF-67) to 3.46 Å and an increased binding energy from 34.02 to 38.87 kJ/mol. Therefore, 0.5 wt% GO-supported core shell ZIF-8@ZIF-67 nanocomposites exhibited the highest CO 2 adsorption capacity of 2.15 mmol/g (at 273 K and 1 bar), 1.34 times higher than that of core-shell ZIF-8@ZIF-67.
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Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Lei He,Lutao Yang,Luxia Zhang,Zhe Wang,Hongjie Cheng,Xiaoguang Wang,Jianrong Lv,Jun Zhang,Hong Mo,Jian Shen
The high salinity of oilfield-produced water caused by the presence of metal ions, such as Ca 2+ and Mg 2+ , has a significantly adverse effect on oil recovery. It is crucial to remove these metal ions efficiently before the oilfield wastewater is reinjected down into the oil wells. To address this issue, we prepared a PEG/Fe 3 O 4 /GO-NH 2 nanoadsorbent by aminating GO, incorporating magnetic Fe 3 O 4 nanoparticles and coating with PEG (PEG = poly(ethylene glycol); GO-NH 2 = aminated graphene oxide). We investigated the removal ratios of the nanoadsorbent for Ca 2+ and Mg 2+ . The respective removal ratios for Ca 2+ and Mg 2+ reached 69.8 % and 61.1 % at 10 min, indicating that the nanoadsorbent was capable of efficiently removing Ca 2+ and Mg 2+ . We also evaluated the reusability of the nanoadsorbent by recycling and reusing it 5 times. At the fifth recycling run, the nanoadsorbent retained relatively high reuse rates (79.1 % for Ca 2+ , 69.5 % for Mg 2+ ) and removal ratios (69.5 % for Ca 2+ , 64.3 % for Mg 2+ ), suggesting that the nanoadsorbent possessed relatively high reusability. Oilfield wastewater treated with the nanoadsorbent was employed for oil recovery in core displacement experiments. The oil recovery efficiency significantly increased by 11.8 % compared with untreated oilfield wastewater. Therefore, the PEG/Fe 3 O 4 /GO-NH 2 nanoadsorbent exhibits considerable potential for the treatment of oilfield wastewater to enhance oil recovery.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 12
·50065
·
IF 2.52
Jingqi Luo,Chuanjie Fan,Xiaodong Zhou
A new type of polydopamine functionalized graphene oxide/carboxymethyl chitosan (DGO/CMC) composite aerogels was synthesized via sol–gel once-forming self-assembly and lyophilization. Polydopamine (PDA) on the surface of GO nanosheets replaced those traditional crosslinking agents to connect CMC chains via hydrogen bonding for the establishment of 3D porous aerogels. With the increasing proportion of CMC, the microstructure of aerogels changed from small pores to large plate-bridge-like pores. In addition, their maximum compressive strengths were 6.767, 11.94, and 16.98 MPa under 90% compressions, respectively, which increased in accordance with CMC content. Furthermore, the adsorption system of the aerogels was simulated well by the pseudo second-order kinetic model and the Langmuir isotherm model, with maximum mass adsorption capacities of 170.3, 186.8, and 312.8 mg/g for Cu 2+ , Ni 2+ , and Pb 2+ ions, respectively. These composite materials have potential applications for water purification because of their simple and efficient synthesis and excellent recyclability and reusability.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1673
·
IF 4.324
Qiulin Hong,Shiliang Chen
It is generally accepted that the convenient fabrication of a metal phthalocyanine-based heterogeneous catalyst with superior catalytic activity is crucial for its application. Herein, a novel and versatile ultrasonic-assisted biosynthesis approach (conducting ultrasonic treatment during biosynthesis process) was tactfully adopted for the direct immobilization of a sulfonated cobalt phthalocyanine (PcS) catalyst onto a graphene–bacterial cellulose (GBC) substrate without any modification. The prepared phthalocyanine–graphene–bacterial–cellulose nanocomposite, PcS@GBC, was characterized by field emission scanning electron microscope (FESEM) and X-ray photoelectron spectroscopy (XPS). The catalytic activity of the PcS@GBC was evaluated based on its catalytic oxidation performance to dye solution, with H2O2used as an oxidant. More than a 140% increase of dye removal percentage for the PcS@GBC heterogeneous catalyst was found compared with that of PcS. The unique hierarchical architecture of the GBC substrate and the strong interaction between PcS and graphene, which were verified experimentally by ultraviolet-visible light spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR) and theoretically by density functional theory (DFT) calculation, were synergistically responsible for the substantial enhancement of catalytic activity. The accelerated formation of the highly reactive hydroxyl radical (·OH) for PcS@GBC was directly evidenced by the electron paramagnetic resonance (EPR) spin-trapping technique. A possible catalytic oxidation mechanism for the PcS@GBC–H2O2system was illustrated. This work provides a new insight into the design and construction of a highly reactive metal phthalocyanine-based catalyst, and the practical application of this functional nanomaterial in the field of environmental purification is also promising.Keywords:graphene;bacterial cellulose;phthalocyanine;nanocomposite;synergism
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MATERIALS RESEARCH BULLETIN
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2020
·
IF 4.019
Jun Liu,Lingling Sun,Guangli Li,Jue Hu,Quanguo He
In this study, spindle-like α-Fe 2 O 3 mesocrystals/reduced-graphene-oxide composites modified glassy carbon electrode (α-Fe 2 O 3 /rGO/GCE) is developed for ultrasensitive electrochemical detection of DA. Morphologies and crystal structures of this composite are characterized by SEM, TEM , XRD , Raman spectrum, and XPS , respectively. The electrochemical behavior of DA on these electrodes are investigated by CV and EIS . The electrochemical conditions are optimized systematically. As results, the oxidation current of DA on α-Fe 2 O 3 /rGO/GCE is 38.13-fold increase than that on bare GCE. It is ascribed to the high catalytic activity of α-Fe 2 O 3 mesocrystals and large electrochemical active area of rGO. Under the best voltammetric condition, wide linear detection range (from 1.0×10 −8 to 9.0×10 -4 mol/L) and low LOD of 3.26 nM (S/N=3) are obtained on the α-Fe 2 O 3 /rGO/GCE. Furthermore, this electrode is also used for DA detection in real human serums samples successfully. This α-Fe 2 O 3 /rGO/GCE provides a good example in design of other mesocrystals-based composite materials for electrochemical detection.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Yuanyuan Li,Li Tang,Dongmei Deng,Haibo He,Xiaoxia Yan,Jinhua Wang,Liqiang Luo
The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-Mn 3 O 4 microparticles wrapped by reduced graphene oxide (MnO-Mn 3 O 4 @rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-Mn 3 O 4 @rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-Mn 3 O 4 @rGO exhibited prominent catalyzing effect on the electroreduction of H 2 O 2 , due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and Mn 3 O 4 . The MnO-Mn 3 O 4 @rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM −1 cm −2 . The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting H 2 O 2 in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.
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