MACROMOLECULES
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2019
·
IF 5.997
Cheng-Jian Zhang,Xing-Hong Zhang
Utilization of carbon disulfide (CS2), a low-cost and sulfur-rich one-carbon (C1) feedstock, for making sulfur-containing polymers is important for both polymer chemistry and applied environmental science. However, the production of well-defined sulfur-containing polymers from CS2 and epoxides remains a key challenge. Here, we report a robust coupling reaction of CS2 and epoxides for chemoselectively producing poly(thioether)s and carbonyl sulfide (COS) in one pot. The resultant polymer has exclusive thioether units and a thiol (−SH) terminal. This route takes advantage of oxygen/sulfur exchanges through two consecutive reactions, i.e., cycloaddition of CS2 to epoxides and dethiocarboxylative ring-opening polymerization of the generated cyclic dithiocarbonates. The process can be conducted in ambient air with several commercially available organic bases as catalysts (initiators) and extended to a variety of epoxides, yielding COS and diverse poly(thioether)s with tens of grams. This work furnishes an original and practical strategy for utilizing CS2 as a sulfur feedstock in polymer synthesis.
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PEST MANAGEMENT SCIENCE
·
2019
·Vol. 76
·期 3
·1039-1047
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IF 3.255
Chao Hu,Wei Wang,Di Ju,Gao-Man Chen,Xiao-Ling Tan,David Mota-Sanchez,Xue-Qing Yang
BACKGROUND Recent work has shown that two codling moth ( Cydia pomonella ) glutathione S -transferase genes (GSTs), CpGSTd1 and CpGSTd3 , can metabolize λ-cyhalothrin, one of the recommended insecticides for C. pomonella control worldwide. However, systematical characterization of delta and epsilon GSTs, especially their potential contributions in the metabolism of λ-cyhalothrin, is currently still lacking in C. pomonella . RESULTS In this study, a total of nine cDNA sequences were identified in C. pomonella , including four in the delta and five in the epsilon subclasses. RT-qPCR showed that seven GSTs were ubiquitously expressed at all developmental stages, and CpGSTe2 , CpGSTe3 , and CpGSTe4 were mainly expressed in larvae. The mRNA levels of CpGSTd2 , CpGSTd4 , and CpGSTe5 were significantly higher in male than in female adults. Tissue-specific expression analysis revealed that the CpGSTe2 , CpGSTe3 , and CpGSTe4 were highly expressed in the midgut while CpGSTd2 and CpGSTd4 were predominantly expressed in the Malpighian tubules. The transcripts of these GSTs (except CpGSTe1 ) were co-expressed following exposure to LD 10 of λ-cyhalothrin for 3 h. Recombinant CpGSTd4, CpGSTe2, and CpGSTe3 proteins expressed in Escherichia coli displayed glutathione-conjugating activity toward 1-chloro-2,4-dinitrobenzene. In addition, λ-cyhalothrin could inhibit the activity of recombinant CpGSTd4, CpGSTe2, and CpGSTe3 enzymes, but only recombinant CpGSTe3 showed λ-cyhalothrin metabolic capacity, with 21.88 ± 1.09% of parental compound being depleted within 1 h. CONCLUSION These data show that CpGSTe3 is a third GST gene, encoding an enzyme that metabolizes λ-cyhalothrin in C. pomonella . © 2019 Society of Chemical Industry
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高影响因子
Energy Technology
·
2019
·Vol. 8
·期 1
·1900896
·
IF 3.163
Mengyao Lv,Fenghui Fan,Longhai Pan,Hangjia Shen,Erum Pervaiz,Jiacheng Wang,Minghui Yang,Jun Wang
Fabrication of an oxygen reduction reaction (ORR) catalyst is the key to an efficient and fast electrocatalytic process in a fuel cell for energy conversion. A reasonable strategy for the synthesis of electrocatalysts is one of the most promising ways for developing precious metal-free ORR catalysts. Herein, the synthesis of a highly active Fe 3 O 4 -based catalyst using a facile molten salts method is proposed. The electrocatalytic analysis shows superior ORR performance with an admirable half-wave potential ( E 1/2 = 0.83 V), comparable with the commercial 20 wt% Pt/C. In contrast, primary Zn–air battery, using synthesized Fe,S–N–C as an air-cathode, displays an open-circuit potential of 1.44 V and a high power density of 84.3 mW cm −2 .
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REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Aili Wang,Zilin Liu,Lu Xu,Nan Lou,Mengying Li,Lu Liu
This work reveals the synthesis of poly(ionic liquid)s (poly-ILs) with controllable beading network structure. The synthesis route involved the formation of novel surfactant-free ionic liquid microemulsions and the in situ photo-initiated thiol-ene “click” reaction. Notably, the beading size of poly-IL's networks was adjusted by altering the component proportion of the designed surfactant-free ionic liquid microemulsion. To characterize the as-prepared polymers, FTIR , DLS, NMR, TGA, DSC , SEM and UV–vis were used, and the adsorption isotherm/kinetics studies were carried out. The results show that poly-ILs exhibit distinct adsorption selectivity and high adsorption capacity for nonionic dye disperse red (1080 mg/g), and these dye absorption polymers can be easily regenerated and recycled without a significant decrease. Therefore, the designed poly-ILs indicate remarkable potential in the application of dying wastewater treatment.
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ADVANCED POWDER TECHNOLOGY
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2019
·
IF 3.25
Osman Ahmed Zelekew,Dong-Hau Kuo,Hairus Abdullah
Herein, we report the bimetallic (Sn,Zn)(O,S) oxysulfide nanocatalyst with a facile method. The Sn-based catalyst with the addition of Zn was synthesized with the proportions of 0, 20, 30 and 50% of Zn to Sn precursors for preparation. The catalysts were characterized by XRD , TEM , SEM XPS , and UV–vis instruments. The nanocatalysts were also tested for the detoxification of Cr +6 . The Sn-20 catalyst with 20 M percent of Zn(Ac) 2 ·2H 2 O showed an excellent performance for the induced photocatalytic reduction of Cr +6 under visible light irradiation at room temperature. The complete reduction of Cr +6 was achieved within 80 min by Sn-20 catalyst. However, 85.6, 97, and 94% of Cr +6 reductions were achieved within 80 min under visible light illumination by Sn-0, Sn-30, and Sn-50 catalysts, respectively. Hence, the bimetallic (Sn,Zn)(O,S) oxysulfide nanocatalyst will be a candidate and highly potential material for the detoxification of Cr(VI)-containing polluted water.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Zhao,Jianhao,Yaling
The application of fluorescent carbon dots in bio-imaging has huge positive significance in the field of biomedicine. By taking this advantage, herein we prepared nitrogen, sulfur and iodine doped carbon dots (N,S,I-CDs) by a facile hydrothermal reaction using C 3 N 3 S 3 , potassium iodate (KIO 3 ) and ethylenediamine (EDA), and the obtained N,S,I-CDs show bright blue fluorescence with a high fluorescence quantum yield of about 32.4%. The prepared N, S, I-CDs could interact with the folic acid (FA) with high selectivity, lead to development of a high sensitive method for the FA detection from 0.1 to 175 μM wide linear range with a detection limit of 84 nM (S/N = 3) and also applied them in U-2 OS cells imaging. Moreover, this sensor possessed a good sensitivity, linearity and reversibility in the temperature range of 10–80 °C, and successfully applied for the temperature sensing in cell HT-29 samples. This investigation illustrates that as-prepared N, S, I-CDs probe may have great potential as a high-performance platform for the accurate recognition of temperature in cells and could provide a new tool for the detection of FA in cells.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yang Wang,Jingyun Huang,Jianguo Lu,Bin Lu,Zhizhen Ye
The shuttling effect of soluble polysulfide in electrolyte has been the major obstacle resulting in the poor cycling stability of Li–S battery. The ultrathin ZrB 2 /graphene oxide/carboxymethocel (ZrB 2 /GO/CMC) layer coated onto cathode via simple doctor blade method has been developed as the effective polysulfide shuttling barrier. Owing to typical 2D scaffold and abundant functional oxygen groups，the GO can provide physical defender as well as chemical trap against polysulfide shuttling. The introduction of conductive ZrB 2 nanoparticles in the hybrid layer can not only improve the conductivity of hybrid layer dramatically reducing electrochemical polarization of Li–S battery without adding other conductive agent but also further form chemical shield by chemisorption which is firstly confirmed by experimental and theoretical calculations. Combining these merits, the ultrathin ZrB 2 /GO/CMC hybrid layer combining with CNT@S hybrid cathode enables the Li–S battery to achieve good rate performance (769 mAh g −1 at a rate of 2 C) and stable cycling capability (with a low capacity decay rate of 0.098% during 300 cycles at 1 C). Specifically, the Li–S battery shows the potential of practical application, with high areal S loading of 5.1 mg cm −2 , delivering the capacity near-commercial lithium-ion battery.
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ANALYTICAL CHEMISTRY
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2019
·
IF 6.35
Huan Gao,Junfang Zhang,Ying Liu,Wenwen Tu,Tianxiang Wei,Zhihui Dai
Development of sensitive detection methods for microRNAs has realistic application value for early clinical analysis and accurate diagnosis. In this study, a triple-helix molecular switch electrochemiluminescence resonance energy transfer (ECL-RET) nanoamplifier was designed to construct an electrochemiluminescence (ECL) biosensor for microRNA determination. The newly synthesized S-doped Lu2O3, which shows a 3 times better ECL performance than Lu2O3, was chosen as the donor in this ECL-RET system. Accordingly, Ag2S quantum dots (QDs) were used as the matched acceptor. They exhibited overlapping spectra and efficient energy transfer between each other. Furthermore, using a triple-helix switch structure with an improved quenching effect for signal amplification and a nano-DNA walker transformational system as a powerful method for target amplification, a supernanoamplifier was achieved. As a consequence, the proposed ECL biosensor for microRNA-141 detection exhibited good analytical performance with a low detection limit (16 aM). The sensor not only led to the development of a novel ECL-RET pair but also provided a strong nanoamplifier for biosensing platform construction, which may offer some new considerations regarding material design, signal amplification, and show promising application value in biomedical and clinical diagnosis.
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高影响因子
ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Fen Liu,Xianwen Kan
In this work, a novel dual-analyte electrochemical sensor was developed based on the combination of boronate affinity and indicator displacement assay (IDA) strategy. Reduced graphene oxidation (RGO) and poly(3-aminophenylboronic acid) (pAPBA) were modified on glassy carbon electrode (GCE), which further bound dopamine (DA) via a reversible covalent interaction between the APBA and DA. Due to the higher affinity of pAPBA to the analytes, the bound DA can be displaced by fructose (Fru) or Alizarin Red S (ARS). As an indicator, the decrease of DA current caused by the displacement was used to monitor the concentration of the analyte. For non electro-active molecule, the decrease of DA current was directly proportional to the logarithm of Fru concentration in a range from 7.0 × 10 −8 to 1.0 × 10 −4 mol/L. For electro-active molecule, the current of DA decreased along with the increase of ARS current owing to the displacement, which were combined as a dual-signl for ARS sensitive detection with a linear range of 9.0 × 10 −8 - 1.0 × 10 −5 mol/L. The results of determining analytes with their interferences demonstrated the good specific affinity of the sensor toward the analytes. The dual-analyte electrochemical sensor based on IDA strategy probably provides a potential guidance for multi-analyte facile, sensitive, and specific detection.
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Nanoscale
·
2018
·Vol. 10
·期 34
·15932-15937
·
IF 7.233
Feng Wang,Jian Lin,Hongye Wang,Shansheng Yu,Xiaoqiang Cui,Asghar Ali,Tao Wu,Yang Liu
Herein, the ECL behaviors of precise mono-Cu+ ion doped Cd–In–S supertetrahedral chalcogenide nanoclusters (Cu@CdInS NCs) were investigated, and the effect of mono-Cu+ ions at the vacancy site of NCs on ECL emission performance was also elucidated. Precise mono-Cu+ ion doping not only induced new ECL emission at 596 nm with enhanced efficiency as high as 21.72% relative to [Ru(bpy)3]2+, but also improved acid tolerance of the ECL performances of NCs. In addition, a simple, fast and label-free dopamine ECL sensor with excellent selectivity was achieved.
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高影响因子
Journal of Hydro-environment Research
·
2018
·
IF 2.087
Pengjun Li,Kairong Lin,Zhanqiang Fang,Wenfeng Zhang
In this study, degradation of nitrate in drinking water by nanoscale zero-valent iron prepared from steel pickling waste liquor(S-NZVI) was investigated. Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM) and Specific Surface Area Analyzer (BET) were used to characterize the properties of the synthesized nanoparticles. Effects of different parameters, such as S-NZVI dosage, initial nitrate concentration, and pH, on the denigration were conducted. The results showed that S-NZVI had the similar characteristic of the NZVI prepared by chemical agents. The experiments indicated that the slightly acid medium with the S-NZVI dosage of 2.8 g/L had a better removal effect of nitrate, and the high removal efficiency of 96% was observed after the reaction time of 2 h, which demonstrated it was feasible and effective to remove nitrate by S-NZVI. The kinetic studies indicated that the degradation rate of nitrate by S-NZVI followed the pseudo-first order kinetics. By analyzing the end-products of nitrate reduction, 94% of nitrate was converted into ammonia ions by S-NZVI and the others translated into a little amount of nitrite and nitrogen. It is a relatively easy and cost-effective method for nitrate removal, so S-NZVI has a great potential application in nitrate removal of drinking water. The ammoniac nitrogen pollution, the main product and second pollution from the denitrification by S-NZVI can be completely degraded by cation exchange resin. So the nitrogen pollution has been completely removed from drinking water polluted by nitrate.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15487-15499
·
IF 2.993
Yang Ming,Rao Richuan
In this work, nonmetallic S was doped into hierarchical Ni(OH) 2 hollow microspheres by ethanol solvothermal method using thiourea as sulfur source. Although the morphology of precursor Ni(OH) 2 is maintained, the surface states and pore properties had greatly changed after S doping. Using the as-prepared S-doped Ni(OH) 2 as adsorbents for the removal of Congo red (CR), the S-doped Ni(OH) 2 exhibited much better adsorption capacity compared with undoped Ni(OH) 2 . The adsorption behavior of both Ni(OH) 2 and S-doped Ni(OH) 2 followed the pseudo-second-order kinetic model and intraparticle diffusion model. The equilibrium data of Ni(OH) 2 could be better fitted by Langmuir model, while Freundlich model could be better used to describe the S-doped Ni(OH) 2 with a much larger adsorption capacity toward CR. The tuned microstructure and changed surface states of adsorbent after S doping may be responsible for the enhanced adsorption performance. Therefore, the doping of S species into hierarchical Ni(OH) 2 paves a new way to tune the microstructure and surface states of Ni-based materials.
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