CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Chunli Zhou,Dengke Wang,Ang Li,Erzhuang Pan,Haiyan Liu,Xiaohong Chen,Mengqiu Jia,Huaihe Song
Porous carbon (PC) materials are the excellent alternative to anodes of high performance sodium ion batteries (SIBs). However, most PC materials are prepared with complicated and multi-step template method, which limits the mass production. Herein, we present a simple and repeatable calcination approach to synthesize three-dimensional porous carbon (3D-PC) materials using poly( p -phenylenediamine) hydrogel as precursor. N, O and P heteroatoms are successfully introduced into 3D-PC to provide more sodium storage sites. The obtained 3D-PC delivers high sodium storage capacity of 332 mAh g −1 at 50 mA g −1 and the reversible capacity still retains 139 mAh g −1 at 10 A g −1 . Moreover, 3D-PC also shows ultralong cycling life, the stable capacities of 212 mAh g −1 and 120 mAh g −1 after 1000 cycles even at the high current density of 0.5 A g −1 and 5 A g −1 , respectively. These results illustrate that 3D-PC electrode displays great rate capability and excellent cycling stability, which would be ascribed to surface-dominated sodium storage mechanism according to quantitative analysis. This method is low cost and effective for preparing high-performance porous carbon anodes for SIBs.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shu Hong,Yang Yuan,Qiuru Yang,Ling Chen,Junqian Deng,Weimin Chen,Hailan Lian,Josué D. Mota-Morales,Henrikki Liimatainen
An efficient and one step production of acetylated and esterified chitin nanocrystals (CNCs) was successfully achieved using choline chloride-zinc chloride deep-eutectic solvent (ChCl-ZnCl 2 DES). In this method, ChCl-ZnCl 2 DES with a mole ratio of 1:2, was used for the esterification and O -acetylation of chitin at 90 °C for 3 h and 6 h. This strategy consisted in using ChCl-ZnCl 2 DES as a green and non-volatile solvent for chitin under heterogeneous condition that, upon addition of acetic anhydride or acetic acid, simultaneous acetylation or esterification and hydrolysis occurred. The DES act as an efficient catalysis of the functional reaction. The acetylation and hydrolysis proceeded efficiently and the yield of partial acetylated CNCs was ca. 61.6% with DS (degree of substitution) of 0.23 under the optimized conditions. Acetic acid was used to substituted acid anhydride to produce CNCs. The yield of acetic acid induced CNCs was ca. 62.0% with higher DS of 0.34. A thorough investigation of the physicochemical characteristics changes of chitin pointed out that the main skeletal structure of obtained CNCs was intact. The thermal stability of CNCs decreased after treated by ChCl/ZnCl 2 . In addition, thermal stability of CNCs functionalized with acetic acid is lower than the ones functionalized with acetic anhydride. DES showed low expenditure and toxicity. This approach provides a novel method for production of functional chitin nanocrystals.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 26
·10517-10522
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IF 3.069
Shasha Pang,Xianwen Kan
Developing an accurate and sensitive method for the detection of environmental pollutants is of great significance. However, traditional single signal based electrochemical sensors are usually susceptible to external and internal effects. To overcome these influences, in the present work, ferrocene (Fc) was covalently functionalized on multi-walled carbon nanotubes (MWNTs) to fabricate a facile electrochemical sensor for the detection of o-nitrophenol (o-NP) and p-nitrophenol (p-NP). With an increase in the concentration of both the nitrophenols, the peak currents of nitrophenols increased while the peak current of Fc remained constant. Thus, Fc can be used as an inner reference element to obtain a ratiometric signal by dividing nitrophenol current by Fc current, which endowed the sensor with a built-in correction of environmental effects. Moreover, Fc can effectively separate the reduction peaks of o-NP and p-NP, which made it possible to detect o-NP and p-NP individually and simultaneously. Due to the self-calibration based on the ratiometric strategy and the good conductivity of MWNTs, the prepared sensor showed high accuracy, reliability, and sensitivity for o-NP and p-NP detection with the linear range of 1.0 × 10−7 to 1.0 × 10−4 M. The facile, low cost, and sensitive sensor reported here has promising potential for accurate and reliable detection of other compounds.
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POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 9
·1266-1274
·
IF 2.352
Shanshan Shen,Cuiyun Li,Huiyun Yang,Yanyu Zhang,Fengan Han,Fuxin Han,Yanfang Liu
Three benzoxazines based on o -allylphenol and 1,6-hexamethylenediamine (HDA) or 4,4′-diaminodiphenyl methane (DDM) or 4,4′-diaminodiphenyl ether (DDE) were respectively blended with diglycidyl ether of bisphenol-A (DGEBA) in various weight ratios followed by thermal polymerization to prepare three series of benzoxazine/DGEBA copolymers. With increasing DGEBA content, the peak temperature of the exothermic peaks in the DSC curves shows a systematic increase for the three series of benzoxazine/DGEBA blends. Each copolymer shows a single glass transition temperature ( T g ). As the content of DGEBA is increased, T g reaches a minimum for the copolymer system based on HDA but a maximum for the two systems based on DDM and DDE. For the same benzoxazine/DGEBA weight ratio, copolymers based on DDM and DDE show high T g values over those based on HDA. The three series of benzoxazine/DGEBA copolymers exhibit a one-way dual shape memory effect based on T g , and the shape memory properties of the copolymers under tensile deformation mode vary with the variation of both diamine bridge structure and DGEBA content. © 2018 Society of Chemical Industry
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xuan Fu,Long Sheng,Yisha Yu,Meihu Ma,Zhaoxia Cai,Xi Huang
Fluorescence resonance energy transfer (FRET), a near-field energy transfer from a fluorescent donor to a fluorescent acceptor within close proximity, has been widely used in biosensing. In this study, a rapid and universal sensor for the detection of ovalbumin (OVA) using nitrogen, oxygen, phosphoric co-doped CDs (NOP-CDs) and graphene oxide (GO) was established based on the FRET technology. First, novel NOP-CDs peak at 443 nm were synthesized by a one-pot hydrothermal method using egg powder and phosphorus acid. Then, in the absence of OVA, the fluorescence of OVA-antibody modified NOP-CDs was quenched by GO via electrostatic attraction and π-π stacking interaction due to the FRET effect. The introduced OVA competed to displace the GO by special binding with the anti-OVA, resulting in the recovery of the fluorescence. This sensor displayed a linear response to OVA from 0.5 to 15 μg/mL with a detection limit of 153 ng/mL and was successfully applied to the detection of the OVA sample with recoveries ranging from 99.25 to 118.90%. In summary, the green and easy-to-synthesize nano-material was used in this method, the accurate detection results, and the simple process exhibited the great potential of this method for practical applications.
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JOURNAL OF CONTROLLED RELEASE
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2018
·
IF 7.877
Jia Song,Chuchu Lin,Xuan Yang,Yanqi Xie,Ping Hu,Huatian Li,Wenbo Zhu,Haiyan Hu
Mitochondria are ideal anti-tumor target due to mitochondria's central regulation role in cell apoptosis and tumor resistance to apoptosis. There are several challenges for mitochondrial targeting drug delivery, including complex multistep preparations, low drug- loading and systemic toxicity from the carriers. To address these issues, we firstly constructed mitochondria-targeting nanodrugs self-assembled from 9-O-octadecyl substituted berberine derivative (BD) using simple nano-precipitation approach. BD-based nanodrugs were modified by DSPE-PEG2000 (distearylphosphatidylethanolamine- methoxypolyethylene glycol 2000) to increase stability. Negatively charged hyaluronic acid (HA) was further coated to conceal positive charges and achieve tumor targeting. PEG and HA dually modified BD NDs (HA/PEG/BD NDs) were prepared with surface charge of −25.8 mV and high drug loading >70%. The degradation of HA by hyaluronidase (HAase) at tumor tissue allowed the exposure of the positively charged PEG/BD NDs to the cells, which is beneficial for cell uptake and further lysosome escape and mitochondrial targeting. Then, HA/PEG/BD NDs were investigated to induce apoptosis through dissipating mitochondria membrane potential, releasing cytochrome C , increasing the activities of caspase 9/3, activating the pro-apoptotic Bax, suppressing the anti-apoptotic Bcl-2 and upregulating ROS levels. In the A549 xenografted tumor model, HA/PEG/BD NDs exhibited obvious tumor cell mitochondrial targeting and significant anti-tumor efficacy. Overall, comparing to conventional nanoparticles , mitochondrial targeting HA/PEG/BD NDs provide a new strategy for cancer treatment with enhanced drug-loading, relatively simplified preparation processes and reduced carrier toxicities.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Ying Liu,Deli Wu,Shuhan Peng,Yong Feng,Zhigang Liu
Cu-Fe-O nanoparticles (CFO NPs), synthesized with zero-valent iron (ZVI) and Cu(NO 3 ) 2 as the metal precursors, were used to enhance ozonation to degrade dimethyl phthalate (DMP). Great DMP degradation and mineralization rates were achieved in a wide range of the initial pH values (3–9); the amount of OH in catalytic ozonation was much higher than that of O 3 alone at the initial pH of 5.70. The generation of hydroxyl radicals ( OH), methyl radicals ( CH 3 ) and superoxide radicals (O 2 − ) were identified and OH mainly contributed to DMP removal. The potential of Fe(III)/ Fe(II) and Cu(II)/ Cu(I) cycles have largely been overlooked, which was found to be the key for producing more OH in CFO/O 3 system. The underlying mechanisms were probably initiated by a chain reaction: initiated O 3 reaction with Cu(I)/ Fe(II) OH to form OH and O 2 − , accelerated reaction between Cu(II)/ Fe(III) and the in situ generated O 2 − with a relatively high reaction constant, redox reaction between Cu(I) and Fe(III), OH oxidizing reaction with DMP to produce CH 3 . In addition, different degradation pathways of DMP were proposed based on the intermediates in the presence of CH 3 . This study sheds new light on the specific radical chain reaction mechanisms of catalytic ozonation.
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GREEN CHEMISTRY
·
2018
·Vol. 21
·期 1
·87-98
·
IF 8.586
Mi Feng,Xingmei Lu,Jie Zhang,Yi Li,Chunyan Shi,Lingling Lu,Suojiang Zhang
To obtain O-acylated chitin from shrimp shells directly, the used solvent should have multiple functions to remove calcium carbonate, protein, and acylated chitin. Herein, we use the acidic natural deep eutectic solvents (NADESs) with the ability to release H+ and various hydrogen bonding sites to achieve the above goal. The involved NADESs with three abilities of decalcification, deproteinization and acylation replaced acids, alkalis, catalysts, and acylation reagents in the conventional method. The experimental results revealed that the components of the NADESs, experiment temperature and time played key roles in the purity and degree of substitution (DS) of O-acylated chitin. Meanwhile, the ratio of shrimp shells to NADESs and a small amount of water had little effect on the preparation of O-acylated chitin. With the optimal NADES (choline chloride/DL-malic acid 1 : 2, ChCl 1–DL Mal 2) treatment under the optimal conditions, the purity of O-malate chitin reached 98.6% with a DS of 0.46, exhibiting antibacterial and anti-tumor effects. The experimental results showed that the removal of calcium carbonate and protein and acylation of chitin were carried out simultaneously. Mechanistic exploration using spectroscopy and experiments confirmed that H+ release from ChCl 1–DL Mal 2 was the main reason for the removal of calcium carbonate and initiation acylation reaction. The protein was degraded to amino acids because of the acidity of ChCl 1–DL Mal 2 and dissolved in the NADES due to hydrogen bonding formation with ChCl 1–DL Mal 2.
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Environmental Science-Nano
·
2018
·Vol. 5
·期 12
·2936-2944
·
IF 6.087
Xiaoying Zheng,Dan Lu,Yuan Zhang,Wei Chen,Mengqi Jin,Xiaoyao Shao,Mengmeng Yang
The increasing use of cerium dioxide nanoparticles (CeO2 NPs) has raised concerns about their potential environmental toxicity. Denitrifying phosphorus removal-aerobic granular sludge (DPR-AGS) is a distinct form of microbial aggregates. In this study, the phosphorus removal efficiencies, the metabolic intermediates of polyhydroxyalkanoates (PHA) and glycogen, the enzyme activities of exophosphatase (PPX) and polyphosphate kinase (PPK), and the microbial community of DPR-AGS under long-term exposure to CeO2 NPs (0 (the control), 1, and 10 mg L−1) in anaerobic/oxic/anoxic (A/O/A) sequencing batch reactors (SBRs) were investigated. The results showed that chronic toxicity caused by 10 mg L−1 CeO2 NPs resulted in increased reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release, which reached 176.32% and 237.35%, respectively, when compared with the control (100%). High-throughput sequencing showed that denitrifying-phosphorus-accumulating organisms (DPAOs) were more sensitive to CeO2 NPs than phosphorus-accumulating organisms (PAOs), which was in accordance with phosphorus transformations during one cycle. However, the abundance of Dechloromonas and Defluviicoccus increased from 4.68% and 3.08% (R0) to 9.95% and 7.06% (R10), respectively, indicating that the tolerance of glycogen-accumulating organisms to CeO2 NPs was stronger than that of PAOs, which was consistent with the transformation of the metabolic pathway from polyphosphate accumulation (PAM) to glycogen accumulation (GAM).
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MATERIALS & DESIGN
·
2018
·
IF 4.525
Haibo Ouyang,Guibiao Li,Cuiyan Li,Jianfeng Huang,Jie Fei,Jing Lu
C/C-Zr-Si-O composites were prepared by carbothermal reduction of hydrothermal co-deposited ZrO 2 , SiO 2 , and C. The bulk density of composites reached 1.71 g/cm 3 with 8 cycles of co-deposition. The matrix of the composites includes ZrC, SiC, ZrO 2 , and SiO 2 with fine grain size (300–500 nm) and homogeneous distribution. The mass and linear ablation rate of C/C-Zr-Si-O composites were 0.112 mg/cm 2 ·s and 0.46 μm/s, respectively, under a plasma flame for 120 s. The attractive ablation resistance of the composites resulted from its unique structure, which tends to form a continuous ZrO 2 -SiO 2 glass layer in the ablation center, a layer of SiO 2 -ZrO 2 bubbles in the transition region, and fluffy SiO 2 nanowires layer in the heat-affected region. These ablation layers were barriers to restrain the diffusion of oxidative gas and heat. The C/C-Zr-Si-O composites provide an alternative ceramics system with attractive ablation resistance, while carbothermal reduction of hydrothermal co-deposited oxides is a feasible method for the structural design of carbon fiber reinforced ultra-high temperature ceramic.
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JOURNAL OF FOOD SCIENCE
·
2014
·Vol. 79
·期 10
·C1886
·
IF 1.791
Lingyi Liu,Boneng Xia,Cheng Jin,Yu Zhang,Ying Zhang
en This link goes to a English section pt This link goes to a English section Antioxidant of bamboo leaves (AOB) is a novel natural food antioxidant approved in China since 2004. Natural phenolics contained in the current AOB are usually polyhydroxy derivatives exhibiting hydrophilic character, which has been marked as water-soluble AOB (AOB-w). In order to broaden the application fields, oil-soluble AOB (cAOB-o) was obtained by chemical acylation of AOB-w with different chain-length fatty acids varying from C8 to C18. Results indicated that the yield and solubility of cAOB-o in 1-octanol solvent depended on the carbon chain length of acyl donor, and cAOB-o derived from C12 fatty acid exhibited the more powerful antioxidant activity evaluated by β-carotene/linoleic acid bleaching assay. Total phenolic content decreased by Folin–Ciocalteu assay. Fourier transform infrared spectra showed the increase of a carbonyl (C = O) peak at 1701 cm −1 and a decrease in the intensity of the absorption at 3400 cm −1 (O-H stretching) in cAOB-o. Acylation was inferred to mainly occur on the hydroxyl groups of flavones C -glycosides according to the change of high-performance liquid chromatography spectra and the contents of total flavonoids and phenolic acids. cAOB-o with the addition of 0.02% significantly increased oxidative stability of palm oil 1.59 times, lard 3.74 times, and fried potato chips 2.08 times, which was better than the effect of oil-soluble tea polyphenol ( P < 0.01). Moreover, cAOB-o was identified to be actually nontoxicity by an acute oral toxicity test. All the above results indicated that cAOB-o could be used as a novel and effective oil-soluble antioxidant in the food industry. Practical Application en This link goes to a English section pt This link goes to a English section Oil-soluble antioxidant of bamboo leaves (cAOB-o) was obtained by chemical acylation with water-soluble AOB (AOB-w) and different chain-length fatty acids. The solubility of cAOB-o in 1-octanol solvent increased sharply. cAOB-o was able to increase the oxidative stability of palm oil, lard, and fried potato chips. cAOB-o has been identified to be actually not toxic by acute oral toxicity test. All the results indicated that cAOB-o could be used as an effective oil-soluble antioxidant in the food industry.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2015
·Vol. 16
·期 8
·17999-18017
·
IF 2.862
Bin Li,Benguo Liu,Jiaqi Li,Huizhi Xiao,Junyi Wang,Guizhao Liang
Isoliquiritigenin (ILTG) possesses many pharmacological properties. However, its poor solubility and stability in water hinders its wide applications. The solubility of bioactive compounds can often be enhanced through preparation and delivery of various cyclodextrin (CD) inclusion complexes. The 6-O-α-d-maltosyl-β-CD (G2-β-CD), as one of the newest developments of CDs, has high aqueous solubility and low toxicity, especially stable inclusion characteristics with bioactive compounds. In this work, we for the first time construct and characterize the supermolecular structure of ILTG/G2-β-CD by scanning electron microscopy (SEM), ultraviolet-visible spectroscopy (UV), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffractometry (XRD). The solubility of ILTG in water at 25 °C rises from 0.003 to 0.717 mg/mL by the encapsulation with G2-β-CD. Our experimental observations on the presence of the ILTG/G2-β-CD inclusion complex are further supported by the ONIOM(our Own N-layer Integrated Orbital molecular Mechanics)-based QM/MM (Quantum Mechanics/Molecular Mechanics) calculations, typically substantiating these supermolecular characteristics, such as detailed structural assignments, preferred binding orientations, selectivity, solvent effects, interaction energies and forces of the ILTG/G2-β-CD inclusion complex. Our results have elucidated how ILTG interacts with G2-β-CD, demonstrating the primary host-guest interactions between ILTG and G2-β-CD, characterized by hydrogen bonds, hydrophobic interactions, electrostatic forces, and conformational effects, are favored for the formation of the ILTG/G2-β-CD inclusion.Keywords:isoliquiritigenin;6-O-α-d-Maltosyl-β-CD;inclusion complex;ONIOM calculation
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危险品化学品经营许可证（带存储）