JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3831-3842
·
IF 2.047
Zhang Baozhong,He Jintao,Tian Panpan,Lv Lina,Zhu Huina,Xie Lingling,Liu Xiaolong,He Baoshan
In this study, based on the specific binding of nucleic acid aptamers (Apts) to 3,3′,4,4′-tetrachlorobiphenyl (PCB77), an ultrasensitive electrochemical aptasensor was constructed for the detection of PCB77. The Apts were captured by hairpin (HP) deoxyribonucleic acid capture probes through complementary base pairing. The large surface area of reduced graphene oxide (rGO) combined with Ag-Cu 2 O significantly improved the efficiency of electron transfer on the electrode surface and provided a large number of binding sites for HP capture probes. Streptavidin (SA)-modified CeO 2 /AuPt was used as signal-generating material to amplify electrical signals cooperatively with Ag-Cu 2 O/rGO, and it was also combined with biotin-modified nucleic acid Apts via the SA-biotin system to form signal labels, which significantly improved the sensitivity of the aptasensor. The morphology and size of the synthesized materials were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The internal structure and composition of the materials were further analyzed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The sensor assembly process was confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Differential pulse voltammetry (DPV) was used to optimize the experimental conditions and evaluate the performance of the sensor. Under optimal conditions, the detection limit of the aptasensor was 0.069 ng/L, and the dynamic range was 0.1–10 3 ng/L, providing a high-quality platform for PCB77 detection. Graphical Abstract
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高影响因子
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
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2022
·Vol. 102
·期 7
·619-628
·
IF 1.925
Yu Zhi-chao,Lu Yun,Shan Pei-hui,Fan Ying,Tao Zhu,Xiao Xin,Wei Gang,Prior Timothy J.,Redshaw Carl
The complexation between cucurbit[8]uril, Q[8], and isonicotinic acid has been studied using 1 H NMR spectroscopy, UV–Vis absorption spectroscopy, Raman spectroscopy and single crystal X-ray diffraction. The results revealed that the 2:1 inclusion complex (4-PA) 2 @Q[8]·25H 2 O is formed, with two guests simultaneously encapsulated in the hydrophobic cavity; the mean planes of the guests are 3.535 Å apart. Graphical abstract
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Song Enhai,Chen Meihua,Chen Zitao,Zhou Yayun,Zhou Weijie,Sun Hong-Tao,Yang Xianfeng,Gan Jiulin,Ye Shi,Zhang Qinyuan
Photothermal sensing is crucial for the creation of smart wearable devices. However, the discovery of luminescent materials with suitable dual-wavelength emissions is a great challenge for the construction of stable wearable optical fibre temperature sensors. Benefiting from the Mn 2+ -Mn 2+ superexchange interactions, a dual-wavelength (530/650 nm)-emitting material Li 2 ZnSiO 4 :Mn 2+ is presented via simple increasing the Mn 2+ concentration, wherein the two emission bands have different temperature-dependent emission behaviours, but exhibit quite similar excitation spectra. Density functional theory calculations, coupled with extended X-ray absorption fine structure and electron-diffraction analyses reveal the origins of the two emission bands in this material. A wearable optical temperature sensor is fabricated by incorporating Li 2 ZnSiO 4 :Mn 2+ in stretchable elastomer-based optical fibres, which can provide thermal-sensitive emissions at dual- wavelengths for stable ratiometric temperature sensing with good precision and repeatability. More importantly, a wearable mask integrated with this stretchable fibre sensor is demonstrated for the detection of physiological thermal changes, showing great potential for use as a wearable health monitor. This study also provides a framework for creating transition-metal-activated luminescence materials.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 40
·61148-61160
·
IF 5.19
Cao Yunmeng,Yue Lin,He Zhuang,Li Zaixing,Lian Jing,Zhou Shilei,Luo Xiao
In this study, the flower-shaped Bi 2 S 3 /g-C 3 N 4 -2.6 heterojunction obtained by solvothermal method and its photocatalytic degradation efficiency of rhodamine B (RhB) and tetracycline (TC) in aqueous solution within 40 min is as high as 98.8% and 94.6%. For RhB degradation, the photocatalytic reaction rate constant (k) of Bi 2 S 3 /g-C 3 N 4 -2.6 is approximately 1.8 and 45.5 times that of Bi 2 S 3 and g-C 3 N 4 . For TC, k is 3.1 and 2.4 times that of Bi 2 S 3 and g-C 3 N 4 , respectively. The key to determining the high catalytic activity of Bi 2 S 3 /g-C 3 N 4 lies in the formation of a good heterojunction between Bi 2 S 3 and g-C 3 N 4 , which accelerates the electron transfer rate between the heterojunction interface and effectively avoids electron–hole recombination. The effects of catalyst dosage, different pH values, inorganic anions, and capture agents on the photodegradation performance of RhB were investigated. The results show that the catalyst dosage is 1.33 g/L, and the solution pH is in the range of 5–9, which has the best removal effect on pollutants, and the isolation of holes ( h + ) with strong oxidizing ability promotes the collapse of pollutant molecules. Combined with electrochemical tests, a possible degradation mechanism was advised.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 15
·42587-42595
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IF 5.19
Yu Haikuo,Yang Xianmei,Dai Jinghua,Li Yuning,Veeran Sethuraman,Lin Jintian,Shu Benshui
The fall armyworm, Spodoptera frugiperda, has become a worldwide pest and threatens world food production. A previous study indicated that azadirachtin, the most effective botanical insecticide for S. frugiperda , inhibits larval growth of the insect. The effect of azadirachtin on the tissues of the larvae, however, remains to be determined. In this study, the effects of azadirachtin on the structure of fat bodies were analyzed. Comparative transcriptomic analysis was conducted between controls and samples treated with 0.1 μg/g azadirachtin for 7 days to explore potential relevant mechanisms. The expression of 5356 genes was significantly affected after azadirachtin treatment, with 3020 up-regulated and 2336 down-regulated. Among them, 137 encode detoxification enzymes, including 53 P450s , 20 GSTs , 27 CarEs , 16 UGTs , and 12 ABC transporters . Our results indicated that azadirachtin could destroy fat body structure and change the mRNA levels of detoxification-related genes. The up-regulated genes encoding detoxification enzymes might be related to detoxifying azadirachtin. Our results elucidate a preliminary mechanism of azadirachtin detoxification in the fat bodies of S. frugiperda larvae.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 4
·1051-1065
·
IF 2.747
Guo Yan,Li Zhuang,Wei Yuxi,Zhang Xinxu,Shi Kexin
Polyvinylpyrrolidone (PVP) and graphene (G)-modified iron oxides (Fe 2 O 3 -PVP-G) are prepared by a simple hydrothermal reaction. Their morphology and structure were examined and proved by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectroscopy. P-nitrophenol (p-NP) is a usual organic pollutant, which is highly toxic and difficult to decompose. Electrochemical reduction of p-NP is a widely used treatment, but the reduction products are still toxic. In this work, the electrochemical catalytic oxidation of p-NP was achieved on Fe 2 O 3 -PVP-G modified electrodes. Compared to pure Fe 2 O 3 , Fe 2 O 3 -PVP-G shows better catalytic performance, with a current density 10.4 times larger than that from Fe 2 O 3 . Electrochemical results verify that the improvement comes from the promotion of its activity and the favorable enrichment of p-NP with the help of the doped PVP and G. pH experiments indicate that p-NP is oxidized to aliphatic acid, which is non-toxic and environmentally friendly. Due to the protection of organic molecules, Fe 2 O 3 -PVP-G exhibits long-term stabilities on electrochemical oxidation on p-NP with the retention of 88.5% for 15 days. Our results also provide another perspective for studying electrocatalytic performances.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 106
·期 7
·2381-2391
·
IF 5.56
Yin Zhongwei,Gao Lin,Zhu Li,Peng Xingqiao,Zhan Xiaobei
Abstract Polysialic acid (PSA) is a long-chain linear amino polysaccharide with broad application prospects; however, its relatively low molecular weight limits its application range. This study aims to explore a new fermentation method of combining the three-phase pH control strategy, three-phase mixing speed control strategy, and exogenous substance to produce high molecular weight PSA. In brief, Escherichia coli K235 6E61 (CCTCC M208088) was used as a fermentation strain. 3 g·L −1 Na 5 P 3 O 10 was added to the initial medium. At 0–12 h, the mixing speed was controlled to 250 r·min −1 , and the pH was maintained at 7.2. At 12–20 h, the mixing speed was increased to 400 r·min −1 , the pH was changed to 6.8, and 0.75% n-hexadecane was added at hour 16. After 20 h, the mixing speed was adjusted to 250 r·min −1 ; the pH was restored to 7.2. Air flow was regulated to 1.2 vvm throughout the experiment. The combination fermentation strategy greatly improved the molecular weight of PSA up to 498 kDa at 32 h, which is currently the maximum molecular weight of PSA produced through microbial fermentation. The yield of PSA reached 6.27 g·L −1 at the end of fermentation (36 h), which is also currently the highest yield of PSA produced by natural bacteria. Therefore, the proposed strategy could simultaneously increase the molecular weight and yield of PSA and is of great importance to the industrial production of high molecular weight PSA.
Key points
• A new fermentation process was explored to produce high molecular weight PSA.
• The yield and molecular weight were improved by the combination fermentation strategy.
• The maximum molecular weight and highest yield of PSA were obtained.
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Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 4
·1087-1100
·
IF 2.339
Liu Jing-yi,Wu Shi-zhao,Shen Zhu,Gao Jing,Hu Xin-quan,Li Guo-hua
Montmorillonite (Mnt) and organic polymer composite membrane are widely used to enhance the corrosive resistance of metal materials due to their unique properties. Herein, a uniform anticorrosion membrane coated on aluminum plate was fabricated with organic-modified nano-Mnt (OMnt) and epoxy resin (EP) as raw materials, which showed good smoothness, wear property and resistance to acidic and salty corrosion. The surface morphology, crystal phase, chemical composition, and microstructure of the OMnt/EP membrane were characterized by optical microscopy, small-angle X-ray diffraction, FTIR, SEM, and TEM, respectively. The results showed that the OMnt/EP membrane was constituted of OMnt and EP. The interplanar distance of OMnt was expanded from 1.44 to 5.36 nm. Electrochemical corrosive resistance of the membrane was tested with Tafel polarization curves and electrochemical impedance spectroscopy. The results showed that the thickness of the membrane had a positive effect on its anticorrosion performance. When its thickness was 0.18 mm, its corrosion voltage ( P corr ) increased along with its content of OMnt, while its corrosion current ( I corr ) showed increasing, decreasing and increasing trend as the content increased from 1 to 5%, from 5 to 7% and from 7 to 9%, respectively. When its content of OMnt was the same, its P corr increased along with its thickness, while its I corr decreased along with its thickness. Its maximum impedance reached 2.29 × 10 7 Ω, which was much greater than that of other EP membranes. Moreover, the corrosion resistance of the composite membranes decreased gradually as the immersion time increased, and the content of OMnt and the ratio of EP to OMnt could also affect the corrosion resistance of the membrane. These results show that the OMnt/EP composite membrane exhibits excellent anticorrosive property, which is highly promising for wide applications in industry.
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IONICS
·
2022
·Vol. 28
·期 4
·1501-1510
·
IF 2.961
Fu Yajing,Zhang Canping,Pan Lin,Yang Longyu,Wang Shiquan,Liu Jianwen
Different amounts of Fe 2 O 3 -coated NiMoO 4 /NiO composites were prepared by solvothermal method following with annealing process. The as-prepared NiMoO 4 /NiO@Fe 2 O 3 composite exhibits a reversible specific capacity of 1250 mAh g −1 after 150 cycles at a current density of 100 mA g −1 as anode for lithium-ion batteries. It exhibits efficient long-term electrochemical performance and maintains the capacity at about 750 mAh g −1 at a high current density of 500 mA g −1 after 200 cycles. The good electrochemical performance of the NiMoO 4 /NiO@Fe 2 O 3 composite may be due to its smaller size and the Fe 2 O 3 coating which can restrain its volume collapse during the charge–discharge cycle. This work could provide a promising strategy for enhancing the performance of molybdate-based composite materials for practical application in lithium-ion batteries.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-9
·
IF 6.408
Wang Tianlin,Hu Yuwen,Liang Mengying,Song Lianjun,Li Tiange,Zhang Xiya,Li Ning,Huang Xianqing
Enzyme-like nanomaterials have received significant attention for their high stability and low cost. However, most nanomaterials require complicated synthesis processes, limiting the range of their potential applications. In this study, a novel cerium-based nanomaterial was fabricated in a facile manner from a mixture of dipicolinic acid (DPA), guanosine 5′-monophosphate (GMP), and cerium acetate under ambient conditions. The obtained nanomaterial, designated as DPA–Ce–GMP, exhibited superior oxidase-like activity owing to the mixed valence (Ce 3+ /Ce 4+ ) of cerium ions. DPA–Ce–GMP efficiently catalyzed the oxidation of 3,3,5,5-tetramethylbenzidine (TMB), achieving a color reaction without requiring hydrogen peroxide. Thus, DPA–Ce–GMP was incorporated into a simple, rapid, and sensitive colorimetric sensor for glutathione (GSH) detection. Within this sensor, TMB oxidation is inhibited by the reducibility of GSH. The sensor exhibits a linear response over two concentration ranges (0.05–10 and 10–40 μM), and its detection limit is 17.1 nM (3 σ /slope). The proposed sensor was successfully applied to GSH quantification in food samples. The developed sensor provides an efficient biomimic oxidase for GSH detection in real samples. Graphical abstract Facile approach to prepare cerium-based nanomaterial with superior oxidase-like activity for colorimetric detection of glutathione in food samples
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Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Liang Chen,Du Chunhua,Wu Xianli,Wang Ju,Xu Jie,Hu Pengyu,Qu Wangda
In order to enhance the valorization of corncob, corncob-based solid acid catalysts were prepared via the method of partial carbonization followed by sulfonation. The prepared acid catalysts were either derived from raw corncob (hemicellulose, cellulose, and lignin), or its residues after different pretreatments, i.e., furfural residue (cellulose and lignin) and hydrolysis residue (humins and lignin), to investigate the components’ effect on the performance of solid acid. These catalysts were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nitrogen adsorption/desorption analysis, scanning electron microscope (SEM), elemental analysis, and acid–base titration. The analysis results suggested that the solid acid (Catalyst-3) derived from the hydrolysis residue had the best performance, with a BET surface area of 338.23 m 2 g −1 and total acid densities of 6.43 mmol g −1 . This results indicated –SO 3 H groups were loaded onto the catalyst successfully. The catalytic activity was tested by cellulose hydrolysis in lithium bromide trihydrate solution (LBTH) system. The yield of glucose was as high as 80.1% at the temperature of 110 °C for 10 h. Moreover, the prepared solid acid had the advantages of easy separation, mild reaction, and producing less by-products compared with traditional liquid acids. This work provides a promising strategy for corncob waste utilization and cellulose efficient hydrolysis, which is of great significance for biomass valorization and conversion.
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CELLULOSE
·
2022
·Vol. 29
·期 2
·1115-1127
·
IF 6.123
Wang Haiping,Qian Xueren,An Xianhui
The research of anti-counterfeiting and encryption has always been a subject of universal concern all over the world. Herein, lanthanide metal–organic framework (Eu-MOF) and CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite were introduced onto pulp fibers (PFs) to prepare fluorescent anti-counterfeiting and encryption papers. Eu-MOF@PFs paper emitted red fluorescence at 254 nm UV excitation. The optimum preparation conditions of Eu-MOF@PFs were 2.5 mmol of Eu(NO 3 ) 3 , 4 h of reaction time and room temperature. When MABr ink was written on Pb/Eu-MOF@PFs paper, the green fluorescent handwriting and red fluorescent paper were observed under 365 nm and 254 nm UV excitation, respectively. The appropriate addition amount of lead nitrate was 0.6 mmol. Pb/Eu-MOF@PFs paper was immersed in MABr solution to prepare MAPbBr 3 @Pb/Eu-MOF@PFs paper. Under 254 nm and 365 nm UV irradiations, MAPbBr 3 @Pb/Eu-MOF@PFs paper emitted red-green double fluorescence and the quantum yields of which were 3.11% and 2.48%, respectively. The crystal structure of MAPbBr 3 was easily destroyed by polar solution, which realized on/off switching of the luminescence signal for multistage information encryption. The above paper-based fluorescence materials were potential for advanced anti-counterfeiting and encryption applications.
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危险品化学品经营许可证（带存储）