COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 11
·1703-1715
·
IF 1.931
Wang Xiaolei,Sinha Tridib K.,Sun Jujie,Wang Chunfu,Kim Jin Kuk,Zong Chengzhong
The carbon–carbon double bonds (C=C) and graphene oxide (GO) in nitrile butadiene rubber (NBR) latex were reduced simultaneously by a novel one-pot to prepare the hydrogenated nitrile butadiene rubber/reduced graphene oxide (HNBR/RGO) nanocomposite in this study, using a hydrazine hydrate/hydrogen peroxide/copper sulfate catalyst. It is a water-based environmentally friendly and time-saving method where no organic solvent has served in the reduction process and hydrazine hydrate is completely consumed and will not harm the environment after the reduction process. HNBR/RGO can improve the electrical and thermal conductivity of HNBR, and the thermal conductivity of HNBR/RGO present better stability at high temperature (160 °C). RGO sheets are beneficial to shorten the curing time and increase cured rate index. And introducing RGO sheets may improve the thermal-oxidative aging resistance. The relationship between aging lifetime and temperature in HNBR/RGO can be estimated, and provide an opportunity for the practical application of HNBR. Graphic Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36933-36941
·
IF 2.914
Chen Jun,He Jinjia,Wang Xiaoping,Hrynsphan Dzmitry,Wu Jiali,Chen Jianmeng,Yao Jiachao
Conversion of Fe II (EDTA)-NO or Fe III (EDTA) into Fe II (EDTA) is a key process in a wet flue gas denitrification technology with Fe II (EDTA) solution. In this work, the stoichiometry, kinetics, and thermodynamics of Fe II (EDTA)-NO reduction by Mn powder were investigated. We first studied the Fe II (EDTA)-NO reduction and product distribution to speculate a possible stoichiometry of Fe II (EDTA)-NO reduction by Mn powder. Then, the effects of major influencing factors, such as pH value, temperature, and Mn concentration, were studied. The pseudo-second-order model was established to describe the Fe II (EDTA)-NO reduction. Simultaneously, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy ( E a ), enthalpy of activation (∆ H ‡ ), and entropy of activation (∆ S ‡ ) were calculated as 23.68 kJ/mol, 21.148 kJ/mol, and − 149.728 J/(k mol), respectively. Additionally, simultaneous reduction of Fe III (EDTA) and Fe II (EDTA)-NO was investigated to better study the mechanism of Fe II (EDTA) regeneration, suggesting that there was a competition between the two reduction processes. Finally, a simple schematic mechanism of NO absorption by Fe II (EDTA) combined with regeneration of manganese ion and ammonium was proposed. These fundamental researches could offer a valuable guidance for wet flue gas denitrification technology with Fe II (EDTA) solution.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 28
·7481-7487
·
IF 3.286
He Yu,Wang Shuo,Wang Junping
Folic acid (FA) is an essential vitamin in humans, and thus, rapid, accurate, and sensitive methods for its quantification in different biological samples are needed. This work describes a novel, simple, and effective dual-emission fluorescence nanoprobe for FA detection and quantification. The probe was covalently linked to amino-modified orange quantum dots (QDs) and carboxyl-modified blue graphene quantum dots (GQDs). The resulting material exhibited two emission peaks at 401 and 605 nm upon excitation at 310 nm. The probe had good selectivity and sensitivity toward FA with an exceptionally low detection limit (LOD = 0.09 nM). This probe was effectively used to quantify FA in animal serum samples. The method has potential utility for FA analysis in different types of biological samples.
Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 1
·163-176
·
IF 3.442
Yu Sheng,Yuan Guoming,Gao Hejun,Liao Yunwen
The self-assembled polymer nanotubes were obtained by a simple solvothermal method. Its physicochemical properties were characterized by SEM, BET, TGA, FT-IR, XPS, and solid-state 13 C magnetic resonance. The effects of initial pH, dosage, and coexisting ions were evaluated for its Cr(VI) adsorption performances. The result showed that polymer nanotubes surface had a large number of organic functional groups and porous structures. In 140 mg/L Cr(VI) solution, polymer nanotubes obtained the largest Cr(VI) adsorption capacity of 147.81 mg/g. Adsorption kinetics and isotherms agreed well with the pseudo-second-order and Redlich–Peterson models, respectively. The desorption process showed that the polymer nanotubes were easy to regenerate in strong polarity solution and had a high removal efficiency. Ionic strength played an important role in the adsorption and the adsorption interaction contained electrostatic interaction, reduction, and chelation in this work. The self-assembly method will constitute a highly efficient adsorbent.
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JOURNAL OF ELECTROCERAMICS
·
2019
·Vol. 43
·期 1
·96-105
·
IF 1.966
Wang Ziyang,Chen Peng,Shi Wenjing,Li Yang,Li Dequan,Zhang Leiyang,Yan Yan,Wang Yifei,Peng He,Li Quan,Liu Gang
In the current investigation, the CuO modified BaTiO 3 ceramics were prepared through the conventional electroceramic processing. XRD, XPS, and SEM have been employed to characterize the phases, valences of ions and the microstructures. The sintering behaviors of the prepared samples were performed using a dilatometer, and ceramics could be fabricated at lower temperature. The electric field and temperature dependent energy storage performance have been studied. The introducing of CuO is very effective to improve the energy storage density and the efficiency due to the formed double P-E loops. 0.5 wt.% CuO modified ceramic exhibited an energy density of 0.52 J/cm 3 , which is nearly twice of pure BaTiO 3 ceramic. The J-E loops of CuO modified samples indicated double domain switches, consistent with the double P-E loops.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 10
·1-12
·
IF 5.479
Bu Lingli,Luo Tao,Peng Huanjun,Li Ling,Long Dengying,Peng Jingdong,Huang Jing
Nitrogen-doped carbon dots (N-CDs) with fluorescence excitation/emission maxima at 365/450 nm were prepared by a one-step hydrothermal approach. The dots possess remarkable photostability, fluorescence blinking and good biocompatibility, and this favors utilization in stochastic optical reconstruction microscopy (STORM). A spatial resolution down to ~60 nm was achieved when imaging HeLa cells using 647-nm laser excitation. This opens new possibilities for various super-resolution techniques based on stochastic optical switching. The remarkable optical properties of the N-CDs also enable them to be applied as invisible security ink for use in patterning, information storage and anti-counterfeiting. Further, it is found that the fluorescence of the N-CDs can be quenched by curcumin with high efficiency due to a combination of inner filter effect and static quenching. Based on this, a fluorometric assay with a detection limit of 21 ng mL −1 was developed for the determination of curcumin.
Schematic representation of the applications of N-doped carbon dots (N-CDs). Curcumin quenches the fluorescence of N-CDs with high efficiency. The remarkable optical properties of the N-CDs enable them to be applied in fluorescent ink, cell imaging and stochastic optical reconstruction microscopy (STORM).
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RARE METALS
·
2019
·Vol. 39
·期 7
·841-849
·
IF 1.785
Zhang Yi-Fei,Zhu Yu-Kun,Lv Chun-Xiao,Lai Shou-Juan,Xu Wen-Jia,Sun Jin,Sun Yuan-Yuan,Yang Dong-Jiang
A heterojunction photoanode of Fe 2 O 3 loaded on a WO 3 film on a fluorine-doped tin oxide substrate (FTO-WO 3 /Fe 2 O 3 ) was prepared via a simple hydrothermal and chemical vapor deposition (CVD) growth method. The photoanode showed higher photoelectrochemical (PEC) water-splitting activity than that of the pristine FTO-WO 3 under simulated sunlight because of the synergistic effect of Fe 2 O 3 and WO 3 . The as-synthesized material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The photocurrent density was estimated by linear sweep voltammetry and further confirmed using intensity-modulated photocurrent spectra. Experiments demonstrated that the coated Fe 2 O 3 enhanced the separation and migration efficiencies of the photoinduced electrons and holes, improving the PEC water-splitting properties. The FTO-WO 3 /Fe 2 O 3 photoanode showed a 1.25 times enhancement in photocurrent density compared with FTO-WO 3 . This result suggests that facile chemical vapor deposition growth is an effective way to fabricate heterojunctions and improve the properties of WO 3 photoanodes for PEC water-splitting applications.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
·
IF 1.784
Zhao Tian,Dong Ming,Zhao Yi
[Fe(HB(pz) 3 ) 2 ], a well-studied spin-crossover (SCO) complex, has been entrapped in NH 2 -MIL-101(Al) metal–organic framework (MOF) via gas diffusion method. [Fe(HB(pz) 3 ) 2 ] would sublimate when temperature exceeds 100 °C, especially at low pressure. Thus, in the selected condition, [Fe(HB(pz) 3 ) 2 ] molecules can be sublimated to a gas phase and diffused into the pores of NH 2 -MIL-101(Al), which yield [Fe(HB(pz) 3 ) 2 ]@MIL-101 hybrid materials. The identity of composites, with a loading of iron complex at ~ 8 wt%, was characterized by X-ray diffraction and spectroscopic attestation. The hybrid materials demonstrate a gentle spin transition curve from 300 to 400 K, which is different from the SCO behavior of [Fe(HB(pz) 3 ) 2 ]. And for the pure [Fe(HB(pz) 3 ) 2 ] sample at 400 K, only 60% of Fe(II) is in HS, while in hybrid samples, HS state is complete. This interesting phenomenon might indicate that the spin transition in the hybrid sample can be triggered at lower temperature. The composite samples were thoroughly studied by X-ray diffraction, IR spectroscopy, atom absorption spectroscopy, nitrogen physisorption, and magnetic measurements. Thereby, a novel MOF-based material with isolated SCO units is proposed, which demonstrate a salient ‘matrix-effect’ on spin-crossover behavior of [Fe(HB(pz) 3 ) 2 ].
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 10
·2759-2770
·
IF 2.531
Liu Xiaowen,Liu Gang,Yu Changqiang,Xie Lan,Chen Yingjie
Molybdenum disulfide (MoS 2 ) is a promising anode material in lithium-ion batteries (LIBs) due to its high specific capacity and typical two-dimensional layered structure. In this work, the MoS 2 -graphene composite with unique hierarchical structure was successfully prepared by ethanolamine-assisted hydrothermal method. Raman spectroscopy showed that MoS 2 in the composite was a single or double layer. And the I D / I G value (1.13) of the composite indicated that it had some defects and disordered structure. X-ray photoelectron spectra illustrated that the majority of Mo and S elements existed in the composite in the form of Mo 4+ and S 2− , and the Mo to S atomic ratio was 1:1.89. Scanning electron microscopy images showed that the majority of auricular-like MoS 2 nanosheets uniformly distributed upright on the graphene surface. Serving as anode material for LIBs, the composite exhibited a high reversible specific capacity, 1133 mAh g −1 (90.4% of the initial capacity) at 200 mA g −1 after 150 cycles. In addition, a specific capacity of 774 mAh g −1 was still achieved even at a high current density of 1000 mA g −1 after 600 cycles. The excellent electrochemical property of the composite was attributed to the combined action of unique hierarchical architecture, unstacked MoS 2 nanosheets, and highly conductive graphene. This work may offer a rational strategy for synthesizing transition mental sulfide-graphene composite with two-dimensional hierarchical structure as high-performance LIBs anodes.
A combined graph of synthesis process, SEM image, and galvanostatic charge-discharge curves of the MoS 2 -GR composite
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·509-520
·
IF 2.064
Tang Chang-cun,Fang Yan-fen,Cao Xin-qiang,Tian Hai-lin,Huang Ying-ping
In this paper, bismuth oxybromide (BiOBr) photocatalysts were synthesized in the presence of tetrabutylammonium bromide (TBAB) at the different volume fractions of ethanol/water and named as BiOBr 0 , BiOBr 20 , BiOBr 50 , BiOBr 80 and BiOBr 100 , respectively. The samples were characterized and applied to the degradation of Rhodamine B (RhB) under visible-light irradiation ( λ ≥ 420 nm). The results indicated that both TBAB and ethanol significantly affected the crystal phase, morphology and surface charge distribution of BiOBr. The exposed (110) faces of BiOBr with Bi 3+ sites contributed to its photocatalytic activity via the enhanced separation of electrons and photogenerated holes as well as the better photo-stability. BiOBr 50 showed the optimal activity for the photodegradation of RhB. Superoxide radical (O ·− 2 ) as the dominant active species was responsible for the degradation of RhB.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-7
·
IF 6.232
Sun Ting,Xia Ning,Yuan Fang,Liu Xiaoman,Chang Yong,Liu Shudi,Liu Lin
Biotinylated peptide-Cu 2+ nanoparticles (Cu-P NPs) were synthesized via “one-pot” self-assembly. The peptide P conststs of a hydrophobic dipeptide (FF), a tripeptide (KGH), and a biotin moiety attached to the terminal amino group of the Lys residue. The Cu-P NPs contain abundant catalytically active Cu 2+ ions which are liberated by acid-induced dissolution. The released Cu 2+ ions catalyze the oxidization of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 because of their intrinsic peroxidase activity, and this results in the formation of a blue-green coloration. Based on the streptavidin–biotin interaction, the Cu-P NPs were employed to establish an enzyme-free colorimetric method for determination of prostate-specific antigen (PSA) as a model biomarker. Under optimal conditions, the linear response range is 0.001–1 ng mL −1 , with a limit of detection as low as 1 pg mL −1 .
Schematic illustration of a colorimetric immunoassay for the prostate specific antigen (PSA) with biotinylated peptide-Cu 2+ nanoparticle (Cu-P NP) as the signal label based on the streptavidin (SA)–biotin interaction. The signal was produced by Cu 2+ -catalyzed oxidization of 3,3′,5,5′-tetramethylbenzidine (TMB). P: KGHFF
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Waste and Biomass Valorization
·
2020
·Vol. 11
·期 12
·6967-6979
·
IF 2.851
Yao Yuan,Hou Hongying,Liu Xianxi,Meng Kun,Qiu Jinxu,Wang Lei,Zhu Jing
Abstract Abstract In this work, copper l -phenylalanine (abbreviated as Cu(L-Phe) 2 ) complex was extracted from the waste acid Cu-printed-circuit-board (Cu-PCB) etchant via a one-step facile liquid phase precipitate reaction for the first time. The corresponding application feasibility in lithium-ion battery (LIB) and the electrochemical Li-storage mechanism were also explored. The resultant Cu(L-Phe) 2 complex displayed a nanosheet-like morphology with 200 nm in thickness. When it was used as the anode active material of LIB, the reversible discharge specific capacities were 231.1 mAh/g at 100 mA/g and 47.2 mAh/g at 5 A/g, respectively. Furthermore, with the help of surfactant sodium dodecyl sulfate (SDS), Cu(L-Phe) 2 complex nanosheets rearranged into the orderly flower-like cluster with a diameter of 13 μm; correspondingly, the reversible discharge specific capacities also increased to about 278.8 mAh/g and 108.8 mAh/g, respectively, implying higher reversibility and cycle performance. Seemingly, orderly flower-like nanosheets clusters with the hierarchical structure may facilitate to modify the electrochemical Li-storage capacity of Cu(L-Phe) 2 complex anode. Clearly, the satisfactory results may open a new path to develop the circular economy mode of acid waste Cu-PCB etchant, which is very important for environmental protection and sustainable development. Graphic Abstract
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