Materials
·
2021
·Vol. 14
·期 12
·3193
·
IF 3.623
Tu Lan,Xiaolong Guo,De Li,Yong Chen
The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO4, but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO4with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO4in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO4strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li–Fe dislocations. This work reveals the dependence of memory effect of LiFePO4on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.Keywords:LiFePO4;spray drying method;memory effect;cathode materials
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高影响因子
ELECTROANALYSIS
·
2021
·Vol. 34
·期 2
·369-374
·
IF 3.223
Xiao Liu,Mei-Hao Xiang,Xinyue Zhang,Qin Li,Xiaoya Liu,Wenjing Zhang,Xia Qin,Fengli Qu
In this work, we reported the development of a nickel metal-organic framework nanosheet array on Ti-mesh (Ni-MOF/TM) as an enzyme-free electrochemical sensing platform for H 2 O 2 determination. The as-obtained sensor exhibited outstanding detection properties of H 2 O 2 , which might be gifted from the large specific surface area, abundant active sites of Ni-MOF nanoarrays. The sensor displayed a good linear range (0.8 μM–4.6×10 3 μM), a detection limit as low as 0.26 μM, a high sensitivity (307.5 μA mM −1 cm −2 ), and a rapid response. Moreover, this enzyme-free sensor is promising for point-of-care (POC) testing of H 2 O 2 in human serum attribute to the excellent performance of Ni-MOF and the simple preparation process of the sensor.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ze-Lin Qiu,Wen-Han Yu,Yu-Jie Shen,Bao-Ku Zhu,Li-Feng Fang
Nanofiltration (NF) membranes with ultra-high separation selectivity to both mono-/divalent anions and cations are desirable for treatment of practical water with complex composition of ions. In this work, a facile and universal method for fabricating polyamide (PA) NF membranes with both ultra-high separation selectivity to mono-/divalent anions and cations was developed. Cationic poly(amido-amine) (PAMAM) dendrimers with different numbers of terminal quaternary ammonium groups were synthesized and incorporated into the polyamide (PA) matrix by interfacial polymerization (IP) to modulate both charge properties and network structures of the PA nanofilms. Contributed by the heterogenous distribution of PAMAM G5-TAC2, a Janus charged PA nanofilm was successfully fabricated. The negatively charged top surface of the PA nanofilm leads to a high electrostatic repulsion to divalent anions while its positively charged back surface exerts a high electrostatic repulsion to divalent cations. Moreover, the network structures of the PA nanofilms are precisely modulated to accelerate the transport of water molecules (103.5 L m −2 h −1 MPa −1 ). Based on the synergistic effect of steric and Donnan effects, the transports of both divalent anions and cations through the G5-TAC2/PIP membrane are hindered, while the transports of monovalent ions are free, so that both ultra-high separation selectivity to mono-/divalent anions and cations (both above 65) can be achieved. Compared to PIP only membrane, G5-TAC2/PIP membrane exhibits high-efficiency in mixed ion separation process.
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Drug Design Development and Therapy
·
2020
·
IF 3.216
Xuan Zou,Yang Wang,Yuheng Wang,Junting Yang,Huishu Guo,Zhengxu Cai
Introduction Paeoniflorin is a main active component in traditional Chinese medicine. Paeoniae alba radix is widely used as a spasmolytic and pain-relieving agent for abdominal spasmodic pain. Functional dyspepsia (FD) is characterized by pain or burning in the epigastrium, fullness, bloating and nausea. However, limited information is available about the effect of paeoniflorin on FD. Materials and Methods In this study, iodoacetamide or clonidine-induced FD rat models were established to investigate the impacts of paeoniflorin on FD induced by different pathophysiologic disturbances. Results We found the therapeutic effect of paeoniflorin through assessing the gastric emptying, gastric accommodation and visceral hypersensitivity. This function of paeoniflorin was related to the release of acetylcholine (ACh), which was accompanied by reduced acetylcholinesterase (AchE) activity in stomach and hypothalamus. Paeoniflorin administration inhibited the cyclo-oxygenase-2 (COX-2) expression and increased the level of ghrelin in the stomach. Besides, the levels of occludin and ZO-1 were elevated in the duodenum from paeoniflorin-treated rats, suggesting the impaired duodenal barrier was ameliorated. Discussion These results indicate that paeoniflorin possesses the ability to alleviate functional dyspepsia.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 16
·9699-9710
·
IF 4.21
Zhu Wenju,Hao Shuaishuai,Yang Mingyang,Cheng Bowen,Zhang Jimei
Abstract In the present research, a glycosyl cross-linking coordination chelate flame retardant was designed to enhance durable flame retardancy of cotton fabrics. It was a halogen-free, non-formaldehyde boron acid and phytic acid ammonium salt synergistic flame-retardant system. The flame retardancy and durability of flame retardants prepared by different saccharides were investigated. Results showed that raffinose was the best cross-linking reagent compared with the other monosaccharides and oligosaccharides. The r affinose as cross-linking reagent prepared g lycosyl cross-linking b oron acid and a mmonium salt of p hytic acid flame retardant (r-GBAP) (100 g/L) can obtain the shortest char length of 56 mm and the largest limiting oxygen index (LOI) value of 37.4%. A lower r-GBAP concentration can get good flame retardancy, due to adopt the three curing cycles process. FTIR, XPS, LOI, TG and SEM testing and characterization techniques were used to analyze and research the flame retardancy, durability, thermal oxidation stability and flame-retardant mechanisms of r-GBAP and the treated cotton fibers. Graphic abstract
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 12
·1-9
·
IF 6.232
Su Zixian,Zhao Guangying,Dou Wenchao
Aflatoxin M1 (AFM1) residues in milk pose a major threat to human health, so there is an urgent need for a simple, rapid, and sensitive method for the determination of trace AFM1 in milk. In this study, a competitive immunochromatographic assay (ICA), using visual (PEI/PSS) 4 red silica nanoparticles (SiNPs) as signal amplification probes, was used for the highly sensitive detection of AFM1. The (PEI/PSS) 4 red SiNPs were used to label AFM1 monoclonal antibody (mAb) to prepare ICA for the detection of AFM1. After exploring the optimal conditions of mAb and immunoprobe dosage conditions, the lowest visual detection limit (VDL) of AFM1 in phosphate-buffered saline with Tween 20 (PBST, 10 mM, pH 7.4, containing 1% BSA, 3% sucrose, 1% trehalose, and 0.5% Tween 20) can reach 0.1 pg/mL. The intuitive visually visible value of AFM1 in both PBST and milk was 10 pg/mL. The results showed that the immunochromatographic system based on high chroma color (PEI/PSS) 4 red SiNPs has high sensitivity and broad application prospects for the detection of trace AFM1 residues in milk. The high chroma (PEI/PSS) 4 red SiNPs are expected to be a convenient biomarker for improving the sensitivity of immune chromatography bands.
The schematic diagram shows the detection principle. In this work, in the competitive experiment, (PEI/PSS) 4 red SiNPs were selected as visual labeling materials, and the specific antibody combined with the labeled material was selected as an immune probe. The AFM1-BSA antigen coupled with the macromolecular BSA was fixed on the T line of the nitrocellulose (NC) membrane. The AFM1 in sample solution competes with AFM1-BSA for the specific binding site of immune probe. The detection sensitivity of this method for AFM1 is obtained by judging the change of the red signal intensity produced by the positive sample, compared with the color at the T line of the negative sample.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·1894-1901
·
IF 2.482
Jiang Peng,Fu Haoyue,Ma Hongfang,Qian Weixin,Zhang Haitao,Ying Weiyong
Highly active Ga 2 O 3 nanoparticles catalysts were prepared by one-step oxidative decomposition of gallium nitrate with sucrose-derived carbon foams (SCF) template. The catalysts were investigated by XRD, Ar physisorption, SEM–EDS, HRTEM, TGA, NH 3 -TPD and 71 Ga MAS NMR. The addition of sucrose facilitated the higher surface area of Ga 2 O 3 nanoparticles and morphological transformation from bulk to flake due to the structure-directing role of the sucrose solution. Moreover, the weak-medium surface acid sites increased by adding sucrose properly, which was related to the larger number of tetrahedral Ga 3+ cations. The optimum catalytic activity was achieved over S X CF-Ga 2 O 3 catalysts at the sucrose/Ga 2 O 3 molar ratio of 6 with the propane conversion of 46.63% and propene selectivity of 88.18%. Graphic abstract
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 101
·期 7
·2930-2939
·
IF 2.614
Xi Yang,Yuan-Yuan Zang,Sha Yang,Zhi-Gang Chen
BACKGROUND Porphyra haitanensis now faces serious heavy metal pollution problems. Natural deep eutectic solvents (NADESs) have been recognized as a novel class of sustainable solvents, which can be used for heavy metal removal. In this study, 28 kinds of NADESs were prepared and investigated as eluent in the removal of lead (Pb), cadmium (Cd), chromium (Cr), arsenic (As), and copper (Cu) from P. haitanensis for the first time, and the adsorption mechanism of NADESs was also studied. RESULTS The removals were greatly improved by NADESs compared with control where the removal rates of Pb, Cd, Cr, As and Cu were 17.4–87.54%, 57.54–100%, 9.8–48.59%, 21.32–78.24% and 11.68–79.73%, respectively. The optimal condition was 10% water content and solid–liquid ratio of 1:20. Moreover, the addition of 20% natural surfactant arabic gum can further increase the heavy metals removal rates of NADESs. The adsorption mechanism experiments showed that the pseudo second-order model and the Freundlich adsorption model can better explain the adsorption mechanism of NADESs on heavy metals removal. CONCLUSION Taken together, a green and efficient method for removing heavy metals from P. haitanensis was established. © 2020 Society of Chemical Industry
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2020
·
IF 3.209
Chunhe Yu,Dongmiao Qin,Xiaohua Jiang,Xiangfei Zheng,Biyang Deng
In this work, fluorescent N-doped carbon quantum dots (N-CQDs) have been synthesized by simple hydrothermal heating of natural osmanthus fragrans, without any toxic ingredients or surface chemical modifications. The N-CQDs possess a high quantum yield of 21.9 %, outstanding blue fluorescence, good water dispersity, and excellent optical stability. Because the favorable inner filter effect (IFE) between N-CQDs and quercetin (QT) occurs, the addition of QT to N-CQDs can cause their fluorescence quenching. When Al 3+ was added to the N-CQDs/QT system solution, it was found that the inhibition of IFE leads to the fluorescence intensity of N-CQDs/QT system enhancement by virtue of a specific binding of QT to aluminum ion (Al 3+ ). Therefore, we used the N-CQDs as a novel off-on fluorescent nanosensor to detect QT and Al 3+ . Under optimal conditions, the fluorescent nanosensor can detect QT within the wide linear response in the range of 0.003−80 μmol/L with as low as 1 nmol/L detection limit. For the detection of Al 3+ , the N-CQDs/QT system showed linearity response toward Al 3+ in a range of 0.1∼100 μmol/L and the limit of detection was found at 26 nmol/L. In addition, N-CQDs have been successfully used to efficient quantification QT in human plasma and monitor Al 3+ in serum samples. Noteworthy, the N-CQDs demonstrated low toxicity toward T24 cells, which realized sensing QT and Al 3+ in the living cells.
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高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Na Guo,Yong-Peng Zou,Hong-Kun Li,Ping Kou,Zhi-Ming Liu,Yu-Jie Fu
Conventional approaches for extraction and enrichment of phytochemicals from plant matrix have many drawbacks such as high organic solvent consumption, low extraction yields, time-consuming and large labor for the enrichment process. In the present study, ultrasound-assisted deep eutectic solvents extraction (UAE-DESs) was developed for extraction and determination of the linarin from Chrysanthemum indicum L. flower (CIF). And a feasible strategy was performed to separate and recover the linarin from denatured DESs using AB-8 macroporous resins as adsorbents. Under the optimal extraction conditions, the maximum linarin extraction yield reached 14.23 mg/g with liquid–solid ratio 32 mL/g, extraction power 340 w, extraction time 32 min and deep eutectic solvent of choline chloride-ethylene glycol with the molar ratio 1:2 and water content 30% (v/v) as a extraction system, which was 1.21 times higher than 80% ethanol extraction. After macroporous resins enrichment, the recovery efficiency of linarin reached 81.55%. In addition, the DESs could be regenerated for extraction process, and macroporous resins could be further used for enrichment process with desired performance. This study provided an effective and convenient extraction and recovery method for linarin determination from CIF which was also applicable to other natural plants.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Qingxiao An,Qinlu Lin,Xiaohui Huang,Rongju Zhou,Xin Guo,Weizhen Xu,Suyan Wang,Dong Xu,Huan-Tsung Chang
Preparation of carbon dots (C dots) with strong emission at long wavelengths is an ongoing goal to their advanced applications, especially in bioanalysis. For sensing Fe 3+ and ascorbic acid (AA), we prepared C dots with a large Stokes shift using o- phenylenediamine (OPD) as the carbon source through an electrochemical method . During the electrolysis, OPD undergoes polymerization, carbonization , and passivation at the platinum anode to form C dots. These C dots were characterized by UV–Vis spectroscopy, transmission electron microscopy , Raman spectroscopy , X-ray photoelectron spectroscopy (XPS), and FT-IR spectroscopy. They are composed of C, N, O, H elements, having a maximum of emission at 570 nm and a supreme excitation at 261 nm, with a Stokes shift of 309 nm. A new emission at 350 nm emerged with their exposure to Fe 3+ and the intensity rises upon increasing Fe 3+ , while the emission intensity at 570 nm decreases. Thus, dissimilar to the usual quenching strategy, a novel ratiometric fluorescent sensor based on the fluorescence intensity ratio (F 350 /F 570 ) of the C dots at 350 nm and 570 nm has been developed for quantitation of Fe 3+ with a limit of detection (LOD) of 0.16 μM and high selectivity toward Fe 3+ against K + , Cu 2+ , and Fe 2+ . With evidence of decreased C–N C and C–O/N–O in XPS and increased content of C O/N O and N–H, we suggested the complexation of Fe 3+ with the surface groups led to the changes in chemical bonds accounting for their optical property variation. Furthermore, AA can quench the fluorescence of C dots at 570 nm and Fe 3+ -treated C dots (incubated with 50 μM Fe 3+ ) at 350 nm by a static mechanism. Accordingly, two assays toward AA were developed with LODs of 0.12 μM and 0.32 μM by using C dots and Fe 3+ -treated C dots, respectively. Especially, both AA assays exhibited excellent selectivity under various substances including those with strong reducing ability such as pyrogallic acid, sodium citrate, tea polyphenol, and dithiothreitol. The applications of the assays were validated with the quantitation of Fe 3+ in urine and AA in beverages. Electrochemical method is a significant approach to develop novel C dots even using the same carbon sources as in other methods.
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Journal of Water Process Engineering
·
2021
·
IF 5.485
Wen-Juan Zeng,Chuang Li,Yue Feng,Shu-Huan Zeng,Bing-Xin Fu,Xiao-Liang Zhang
GO/CNTs composite membranes with fine hierarchical nanostructure were facilely fabricated by intercalation with 1D carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) into 2D graphene oxide (GO) nanosheets for efficient organic wastewater treatment. By characterization results of XRD, Raman, FTIR, TEM and water contact angle, MWCNTs-COOH was successfully to be intercalated into GO lamellar interlayers with grafting reactions, which would improve water permeated flux and stability of membrane. The influences of GO/CNTs ratios, loading amounts, CNTs types and support types on the membrane separation performance were systematically investigated towards methylene blue dye solution. For the GO/CNTs composite membranes prepared under the optimized conditions, the permeated flux of 34.4 L m −2 h -1 and rejection over 99.7 % were obtained towards methylene blue solutions under the transmembrane pressure difference of 0.9 bar, respectively. Compared with pristine GO membrane, it exhibited a nearly 10-fold water permeated flux improvement meanwhile maintaining high rejection. Moreover, the electrostatic interaction and size exclusion effects were synergistically contributed to be responsible for the efficiently separation properties of the GO/CNTs membranes towards different positively/negatively charged dyes and neutral organic molecules. Such the GO/CNTs membranes also exhibited good chemical stability for acid resistance with highly efficient separation performance.
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