RESEARCH ON CHEMICAL INTERMEDIATES
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2019
·Vol. 46
·期 1
·509-520
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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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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 28
·7481-7487
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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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JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 22
·14218-14232
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IF 3.442
Xu Bo,Zhang Xiong,Gan Shuchun,Zhao Jianhao,Rong Jianhua
Excellent mechanical and self-healing features could make hydrogels an ideal candidate for the application of load-bearing soft tissue replacements such as cartilage. In this study, a dual ionically cross-linked 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC)/poly(acrylic acid) (PAAc)-Fe 3+ hydrogel was constructed using a one-pot method (in situ polymerization of AAc in the presence of HACC and Fe 3+ ). Both macromolecular positively charged HACC and Fe 3+ metal ions acted as cross-linkers to form ionic bonds with negatively charged PAAc. The HACC/PAAc-Fe 3+ hydrogels demonstrated ultra-high mechanical strengths (tensile strength of ca. 9.86 MPa and compressive stresses greater than 95 MPa at 99% strain), excellent self-recoverability (ca. over 90% toughness recovery within 5 h without any external stimuli), outstanding self-healing properties (ca. 74% self-healing efficiency at 70 °C for 48 h), transparency, and high stabilities in aqueous environments. The mechanical properties of the hydrogels could be adjusted by varying the concentration of HACC and Fe 3+ . This work provides a new approach for the construction of novel tough and transparent hydrogels with a fully ionically cross-linked network.
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Nature Communications
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2019
·Vol. 10
·期 1
·1-9
·
IF 11.878
Li Xiankai,Li Mingjie,Xu Jie,You Jun,Yang Zhiqin,Li Chaoxu
Liquid metal (LM) droplets show the superiority in coalescing into integral liquid conductors applicable in flexible and deformable electronics. However, the large surface tension, oxide shells and poor compatibility with most other materials may prevent spontaneous coalescence of LM droplets and/or hybridisation into composites, unless external interventions (e.g., shear and laser) are applied. Here, we show that biological nanofibrils (NFs; including cellulose, silk fibroin and amyloid) enable evaporation-induced sintering of LM droplets under ambient conditions into conductive coating on diverse substrates and free-standing films. The resultants possess an insulating NFs-rich layer and a conductive LM-rich layer, offering flexibility, high reflectivity, stretchable conductivity, electromagnetic shielding, degradability and rapid actuating behaviours. Thus this sintering approach not only extends fundamental knowledge about sintering LM droplets, but also starts a new scenario of producing flexible coating and free-standing composites with flexibility, conductivity, sustainability and degradability, and applicable in microcircuits, wearable electronics and soft robotics.
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Scientific Reports
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2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Yu Pingping,Yu Haifan,Sun Qisong,Ma Bomou
In this study, polyacrylic acid modified filter paper (FP/PAA) was synthesized by in-situ polymerization of acrylic acid, which was used as a matrix to chelate nano-scale zero valent iron (nZVI). The loading content of nZVI in the filter paper reached 24.8%. The fabricated composite FP/PAA/nZVI was characterized by SEM, FT-IR and TGA respectively. Moreover, it was used for the removal of methyl blue and methylene blue as model anionic and cationic dyes. The effect of initial dye concentration on decolorization efficiency was investigated. The results showed that FP/PAA/nZVI enhanced the removal of dye from the simulated dye wastewater and the decolorization efficiency exceeded 95% for the dye solutions lower than 20 mg/L. More importantly, the filter paper supported nZVI realized the continuous treatment of simulated dye wastewater by a simple filtration process. This study hopes to serve as a basis for the application of nZVI in textile wastewater treatment.
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IONICS
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2019
·Vol. 26
·期 1
·127-139
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IF 2.289
Zeng Tianbiao,Zhang Chuhong
The precursor synthesis of the LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) is usually operated in NaOH/NH 3 ·H 2 O aqueous system, and the pH value and the liquid feeding rate need strict control. Herein, a simple synthesis method was investigated without pH and liquid feeding rate control by using urea as the precipitation agent. The relationship of the metal ions’ concentration to the homogeneity of the precursor was studied in detail. To decrease the lattice disordering ratio and increase the reversible capacity of the NCA, polar CTAB molecules were added into the CO(NH 2 ) 2 /H 2 O system. The lattice disordering ratio of the NCA was decreased and the integral electrochemical performances were improved. The stable reversible capacity of the battery in 0.1, 0.5, 1, 2, 3, 4, and 6 C can reach to 188, 173, 167, 162, 152, 143, and 125 mAh g −1 . It is expected that the simple synthesize method may provide some inspiration to the NCA cathode research.
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 8
·1-10
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IF 2.009
Li Jiahe,Lin Kaifeng,Jiang Aifeng,Hao Dongyu,Yang Yulin,Xia Debin,Fan Ruiqing
With the development of aerospace industry, hybrid nano-Al particles with considerable energy release and stable surface immune to the air and moisture have attracted much attention when they are applied as fuel to solid rocket propellants. In this study, nano-Al particles (80~120 nm) were covered with an organic single layer, which was obtained by solvent-free gas-phase-coating approach in the presence of organosilanes. The characterization results clearly indicated that the coated aluminum nanoparticles are resistant to the air and moisture. Note here that no significant loss of the active aluminum contents was observed after being coated with the organic single layer, meaning that negligible power loss occurs during the combustion of such coated aluminum particles as a fuel. Combining with the advantage that the wettability of the coated surface could be adjustable by using chlorotrimethylsilane (CTMS) and dimethoxydimethylsilane (DMODMS) in a given sequence, such approach opens a new door to produce a potential fuel with protected surface and considerable energy release for solid rocket propellant. Moreover, the possible mechanism for coating the surface of aluminum nanoparticles with CTMS and DMODMS was proposed.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 24
·6497-6508
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IF 3.286
Li Fang,Hu Yuting,Li Zimu,Liu Jiachang,Guo Lei,He Jianbo
A simple double-layered three-dimensional (3D) microfluidic paper-based analytical device (μPAD) was designed for the simultaneous determination of six metal ions—Fe(III), Ni(II), Cr(VI), Cu(II), Al(III), and Zn(II)—for the first time. The 3D μPAD was composed of two paper layers: a top pretreatment layer and a bottom colorimetric detection layer. The sample solution added to the central sample reservoir of the 3D μPAD could be automatically divided into eight flow pathways and be automatically pretreated while flowing through the pretreatment zones located in the microfluidic channels, and automatically carried out the chromogenic reactions after reaching the detection zones. Random diffusion of the chromogenic reagents was effectively prevented by transport of the pretreated sample solution to the detection zones through 3D microfluidic channels with an L-type circuitous flow route design, resulting in highly increased color uniformity and reproducibility. Combined with use of a flat LED lamp as an upward lighting source and a smartphone as a convenient detector, improved color perception, highly enhanced sensitivity, and an extended detection range were obtained. Finally, the double-layered 3D μPAD was applied to the multiplexed determination of the six metal ions in mixtures and environmental samples with satisfactory results. Detection limits as low as 0.2, 0.3, 0.1, 0.03, 0.08, and 0.04 mg/L for Fe(III), Ni(II), Cr(VI), Cu(II), Al(III), and Zn(II) detection, respectively, were achieved, which are about one order of magnitude lower than obtained with previously reported μPADs for the detection of metal ions. The present 3D μPAD is simple, fast, selective, sensitive, and user-friendly, and holds great application potential for multiplexed on-site analysis.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 8
·1-8
·
IF 5.479
Li Yuanyuan,Du Qianqian,Zhang Xiaodan,Cao Haiyan,Huang Yuming
The authors describe the preparation of gold nanoclusters (AuNCs) capped with kojic acid. The capped AuNCs exhibit bright green fluorescence (peaking at 500 nm upon excitation at 375 nm), a nanosecond lifetime (0.37 ns), and a quantum yield (QY) of 22% in aqueous solution. This is higher than most of the previously reported AuNCs. The QY increases to 58% due to aggregation-induced emission in ethanol solution, and the lifetime is prolonged to 1.3 ns. The fluorescence of the KA-AuNCs is quenched by Eu(III) ion but is recovered by addition of phosphate due to its stronger affinity for Eu(III). Under the catalytic action of alkaline phosphatase (ALP), ascorbic acid phosphate (AAP) is transformed to free phosphate. On this basis, a fluorogenic assay for ALP was established. Response is linear in the 0.2 to 20 U·L −1 activity range, and the detection limit is 0.04 U·L −1 (at S/ N = 3). The assay was successfully applied to the determination of the activity of ALP in spiked human serum and also to screen for its inhibitors.
Highly luminescent and stable gold nanoclusters (AuNCs) with aggregation-induced emission property were synthesized through non-thiolate ligand kojic acid (KA) and demonstrated as an efficient probe for screening for alkaline phosphatase (ALP) activity and its inhibitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 22
·22362-22371
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IF 2.914
Du Hongxue,Shi Shuyun,Liu Wei,Che Guangbo,Piao Mingyue
Polyethylene glycol diacrylate (PEGDA) hydrogel microsphere was synthesized by UV-assisted reverse emulsion polymerization as an efficient adsorbent for water purification. Optical microscopy and TEM proved its spherical and hollow structure, while XRD pattern proved that it was amorphous with limited crystallinity. Abundant oxygen-containing functional groups such as hydroxyl were detected by FTIR. The hydrogels exhibited low swelling capacities ranging from 0.19 to 0.77 g/g in water and would decrease in salty solutions. The effects of operation parameters on the bisphenol A (BPA) adsorption were studied, including the polymer composition between PEGDA and polyethylene glycol methacrylate (PEGMA), initial concentration of BPA, pH, and operation temperature. The resulting hydrogel, especially for PDM 2 (the ratio between PEGDA and PEGMA is 2), was able to effectively enrich BPA in water. The adsorption capacity was nearly stable below pH 8.0 and decreased when beyond 8.0. Thermodynamic parameters reflected that BPA adsorbed by hydrogel was a spontaneous ( ΔG 0 < 0) and exothermic ( ΔH 0 < 0) progress. The adsorption capacity increased with the increase of the concentration of NaCl, exhibiting salinity-enhanced adsorption capacity driven by hydrophobic force. Excellent results were also achieved by applying hydrogel for spiked real surface waters, which accounted for more than 91% compared to simulated solution. As-prepared hydrogel was expected to be good candidate for treatment of endocrine disruptors with lower solubility in water.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 8
·2132-2141
·
IF 2.372
Naz Farah,Mumtaz Fatima,Chaemchuen Somboon,Verpoort Francis
Abstract In this work, for the first time, zeolitic imidazolate frameworks (ZIFs = ZIF-8, ZIF-67, and Zn/Co-ZIF), obtained via spray drying, were used as heterogeneous catalysts for the ring opening polymerization of ε-Caprolactone without any co-catalyst or initiator. The catalytic activity of the spray dried ZIFs series varies in the order of Zn/Co-ZIF < ZIF-67 < ZIF-8. It was found that the catalytic activities of ZIFs series correlate with the defects present in their structure. Among active sites of ZIFs, only the acid sites derived from structural defects are supposed to catalyse the polymerization reaction. Under optimal reaction conditions, ZIF-8 shows a superior catalytic activity compared to ZIF-67 or Zn/Co-ZIF and leads to the formation of higher molecular weight linear polycaprolactone. The recyclability test confirmed that the catalyst could be reused and no significant loss of catalytic activity was found after three uses. Graphical Abstract
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Metabolomics
·
2019
·Vol. 15
·期 4
·1-10
·
IF 3.167
Lu Hengqian,Chen Haiqin,Tang Xin,Yang Qin,Zhang Hao,Chen Yong Q.,Chen Wei
Introduction Metabolomics has been successfully applied to guide the rational engineering of industrial strains and improve the performance of bioprocesses. Mortierella alpina has traditionally been one of the most popular industrial strains for the production of polyunsaturated fatty acids. However, a systematic comparison and optimisation of the metabolomic analysis methods of M. alpina has not yet been reported. Objective We sought to identify potential weaknesses that are important for accurate metabolomic analysis. We also aimed to determine an efficient sample preparation protocol for metabolomics studies in the oleaginous filamentous fungus M. alpina . Methods In this study, using GC-MS, we evaluated three sample preparation protocols and five solvent mixtures by assessment of the metabolite profile differences, the sum of peak intensities and the reproducibility of metabolite quantification. Results The freeze-dried biomass had better reproducibility and recovery than fresh biomass for metabolite extraction and data normalisation that is part of a metabolomics analysis of filamentous fungi M. alpina . Methanol:water (1:1) was superior for the profiling of metabolites in oleaginous fungi M. alpina . The unbiased metabolite profiling difference between the growth phase and lipids synthesis phase revealed that the degradation of amino acids were critical nodes for the efficient synthesis of lipids in M. alpina . Conclusion The use of freeze-dried biomass for metabolite extraction and data normalisation was more efficient at measuring the active state of the intracellular metabolites in M. alpina . We recommend extracting the intracellular metabolites with methanol:water (1:1). An important role of amino acid oxidation in the nitrogen limitation-mediated lipid accumulation was found.
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