APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2019
·Vol. 191
·期 2
·605-622
·
IF 2.14
Bai Rubing,Yu Yuanyuan,Wang Qiang,Shen Jinsong,Yuan Jiugang,Fan Xuerong
Chitosan oligosaccharide (COS), a water-soluble carbohydrate obtained from chemical or enzymatic hydrolysis of chitosan, has similar structure and properties to non-toxic, biocompatible, and biodegradable chitosan. However, COS has many advantages over chitosan due to its low molecular weight and high water solubility. In the current work, COS was incorporated in the laccase-catalyzed polymerization of hydroquinone. The laccase-catalyzed polymerization of hydroquinone with or without COS was investigated by using simple structure of glucosamine hydrochloride as an alternative to COS to understand the mechanism of COS-incorporated polymerization of hydroquinone. Although polyhydroquinone can be regarded as the polymeric colorant with dark brown color, there is no affinity or chemical bonding between polyhydroquinone and cotton fibers. Cotton fabrics were successfully in-situ dyed into brown color through the laccase-catalyzed polymerization of hydroquinone by incorporating with COS as a template. The presence of COS enhanced the dye uptake of polyhydroquinone on cotton fibers due to high affinity of COS to cotton and covalent bonding between COS and polyhydroquinone during laccase catalysis. This novel approach not only provides a simple route for the biological coloration of cotton fabrics but also presents a significant way to prepare functional textiles with antibacterial property.
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JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 49
·期 3
·1889-1895
·
IF 1.676
Chen Yufei,Wu Yunzhong,Dai Guoqing,Li Zhiguo,Ma Chengguo,Cui Weiwei
The silane coupling agent vinyl trimethoxysilane (a171) was used to modify graphene (GE), SiO 2 microspheres prepared by the Sol–Gel method coated on the surface of GE to obtain SiO 2 -coated modified GE (SiO 2 @a171-GE). The matrix (MBAE) was synthesized from 4,4′-diaminodiphenyl methane bismaleimide (MBMI) and diallyl bisphenol A (BBA), Bisphenol A bisallyl ether (BBE), in which BBA and BBE were used as reactive diluents. At the same time, SiO 2 @a171-GE/MBAE composites were prepared by in situ polymerization, which has SiO 2 @a171-GE as the reinforcement and MBAE as the matrix. The effect of SiO 2 @a171-GE on the MBAE material properties was studied by characterizing and analyzing the modified graphene and the coating function. The results show that GE is successfully modified by silane coupling agent, and SiO 2 microspheres are uniformly coated on the surface of a171-GE. SiO 2 @a171-GE component improves the composite properties. The dielectric constant and the dielectric loss are about 70 and 3.7 × 10 −3 in the frequency range of 10 2 –10 4 Hz, and the heat resistance enhances with the increase of SiO 2 @a171-GE. This composite has excellent dielectric, mechanical and thermal properties and has the potential to be an electrolyte material for supercapacitors.
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Scientific Reports
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2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Chen Zhiqiang,Yang Meng,Shi Qian,Kuang Xiao,Qi H. Jerry,Wang Tiejun
With the increasing amount of electronic waste (e-waste) generated globally, it is an enormous challenge to recycle printed circuit boards (PCBs) efficiently and environmentally friendly. However, conventional recycling technologies have low efficiency and require tough treatment such as high temperature (>200 °C) and high pressure. In this paper, a small-molecule assisted approach based on dynamic reaction was proposed to dissolve thermosetting polymers containing ester groups and recycle electronic components from PCBs. This effective approach operates below 200 °C and the polymer could be dissolved in a short time. It has a remarkable ability to recycle a wide range of commercial PCBs, including boards made of typical anhydride epoxy or polyester substrate. Besides, it is environmentally friendly as even the recycling solution could be reused multiple times. In addition, the wasted solution after recycling could be used for board bonding and damage repair. This work also demonstrates the advantage of using polymers containing ester groups as the PCB substrate in consideration of eco-friendly and efficient recycling.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·487-494
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IF 1.947
Gu Jing,Zhang Hanfang,He Xiaojun,Yu Moxin,Wang Xiaoting,Xiao Nan,Qiu Jieshan
It is a big challenge to fabricate monolithic carbons with abundant active sites for ion adsorption. Herein, monolithic carbon nanosheets (MCNSs) were fabricated from anthracene oil by a Ca(OH) 2 template-space-confinement strategy coupled with KOH activation. The as-obtained MCNSs feature unique sheet-like structure with developed micropores, providing abundant active sites for ion adsorption, shortening ion transfer distance, and improving electron conductivity. The MCNS electrode materials exhibit a high specific capacitance of 284 F g −1 at 0.05 A g −1 , a remarkable rate performance of 229 F g −1 at 20 A g −1 , and a good cycling stability with 94.7% capacitance retention after 10,000 cycles at 5 A g −1 in 6 M KOH electrolyte. This work may provide a facile and cheap approach for the scale-up production of monolithic carbon nanosheets with abundant micropores from the derivates of coal tar for high-performance supercapacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36776-36785
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IF 2.914
Ren Zhichang,Wu Wanlin,Yu Ling,Yu Yang
Thallium as a highly toxic metal element has been listed as one of priority drinking water contaminants. In this study, manganese oxide nanoparticles were synthesized through a simple hydrothermal method and applied for the removal of thallium(I). The adsorbent was composed of numerous needle-like nanorods and had an average volume diameter of 230 nm after heat-drying procedure. The crystal form of adsorbent was determined as α -MnO 2 . The adsorbent exhibited a much faster adsorption rate than most of previously reported adsorbent, achieving over 66.4% of equilibrium adsorption capacity in the first 10 min. The adsorption process was found to be highly affected by solution pH and higher than 100 mg/g of adsorption capacity could be obtained in a wide pH range of 6.0–10.0. The isotherm study indicated that the adsorption of Tl(I) on the adsorbent was favorable and governed by a chemisorption process, with the maximum adsorption capacity of 505.5 mg/g at pH 7.0. The adsorption process was confirmed to be thermodynamically spontaneous and endothermic. The presence of Na + , K + , Mg 2+ , Ca 2+ , and Cu 2+ cations had certain negative effects on the uptake of Tl(I). Based on the batch experiments and XPS analysis, the deprotonated hydroxyl groups that bonded to manganese atoms worked as the binding sites for the effective removal of Tl(I) ions and no redox reaction occurred during the adsorption process.
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CHROMATOGRAPHIA
·
2019
·Vol. 83
·期 2
·293-297
·
IF 1.552
Zhang Pengyu,Liu Wei,Li Wei,Wang Qingshuang,Zhang Guilin,Zhao Lihui,Li Jingmei,Ji Wei,Wang Chen,Wang Jiaqi
A rapid and sensitive liquid chromatography method was developed and validated for the simultaneous determination of 21 free amino acids in nasal feeding nutrition after liquid extraction-derivatization. The analytes were extracted by PEG/EtOH (60/40, v/v), concentrated by a Dowex Monosphere 650C cation-exchange resin and derivatized using phenyl isothiocyanate (PITC). The separation was carried out on a reversed-phase Shimadzu Inertsil ODS-3 column with component A 10 mmol L −1 phosphate buffer solution (pH 6.5) and B acetonitrile/methanol/water (40/45/15, v/v/v). The optimal separation of 21 amino acids was obtained within 15 min. The average recoveries of 21 amino acids spiked at 3 concentrations (0.5, 2.0 and 10.0 µmol L −1 ) were in the range of 62.49–82.54%. Limits of detections (LODs) varied from 0.002 to 0.038 µmol L −1 and limits of quantifications (LOQs) ranged from 0.01 to 0.19 µmol L −1 . This rapid and sensitive method has been successfully applied for the analysis of nasal feeding nutrition from Chinese markets, and the contents of free amino acids in these samples are very different.
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POLYMER BULLETIN
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2019
·Vol. 77
·期 9
·4507-4522
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IF 1.858
Liu Huijun,Zhang Jianing,Ding Ke,Chen Xiangning,Han Tao
This study aimed to establish a purifying immunoaffinity column (IAC) for four kinds of Fusarium toxins (zearalenone, deoxynivalenol, T-2, and HT-2) simultaneously using poly-glycidyl methacrylate–divinylbenzene [P(GMA–DVB)] as the column matrix. The P(GMA–DVB) microsphere was synthesized using glycidyl methacrylate (GMA) and diethylbenzene (DVB) at an optimal polymerization temperature of 80 °C, the initiator 2,2′-azodiisobutyronitrile concentration of 2.50 g/mL H 2 O, and the DVB-to-GMA ratio of 3:5 (wt.). The polymerized P(GMA–DVB) microspheres were modified with 1,6-hexanediamine, activated with glutaraldehyde, and coupled with the four toxin monoclonal antibodies. The coupling rate of the activated resin was calculated to be 95.95%. The maximum capacity of the IACs was 264 ng deoxynivalenol, 231 ng T-2, 210 ng HT-2, and 292 ng zearalenone. After eight uses, the maximum capacity had no obvious decrease. The recovery of the four Fusarium toxins on the P(GMA–DVB) IAC was 70.03–85.39% in flour, with the relative standard deviations of 4.67–15.93%. The IACs were applied to the actual flour samples.
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JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2019
·Vol. 57
·期 3
·886-894
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IF 1.85
Xu Yujia,Dai Taotao,Huang Kechou,Liang Lu,Liu Chengmei,Chen Jun
It is an interesting topic to elucidate the interaction among plant proteins and bioactive lipid components. However, there is a shortage of understanding regarding the nature of the interaction between rice protein and conjugated linoleic acid (CLA). In this study, the intrinsic fluorescence intensity of rice glutelin (RG) was quenched upon increasing concentrations of CLA, indicating the occurrence of an interaction between them. Thermodynamic analysis showed that the RG-CLA binding process occurred spontaneously and hydrogen bonds were the primary driving force. Moreover, only one binding site was calculated between RG and CLA by the intrinsic fluorescence data. The surface hydrophobicity of RG was reduced with increasing CLA. Circular dichroism and synchronous fluorescence spectroscopy showed conformational and microenvironmental changes around the chromophores of RG. The α-helical content increased and β-sheet content declined after the binding reaction. The computational docking program displayed the target site in which CLA and amino acid residues of RG might be linked together. This study provides valuable insights into the nature of the interactions between plant proteins and fatty acids.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 5
·1973-1983
·
IF 3.442
Du Yingying,Zhao Lei,Chen Hui,Huang Zhaohui,He Xuan,Fang Wei,Li Weixin,Zeng Xianghui,Zhang Fuqing
g-C 3 N 4 has been widely investigated in photocatalytic water splitting, even though they still suffer low specific surface area and high carrier recombination. Here Co-doped g-C 3 N 4 (Co–C 3 N 4 ) has been successfully synthesized under an argon atmosphere to 550 °C for 4 h via pyrolysis of an organic–inorganic hybrid precursor which was pre-prepared through the hydrothermal procedure. The Co–C 3 N 4 possesses a higher specific surface area of 82 m 2 /g, which is 16.4 times as high as that of the bulk g-C 3 N 4 . On the other hand, the in situ Co doping can extend the light absorption region to visible light and greatly improve the charge transfer rate. Both the changes in surface area and optical property are beneficial to the photocatalytic reaction. The Co–C 3 N 4 photocatalyst with the optimal ratio of cyanuric acid to melamine for 1:40 exhibited an excellent H 2 production rate of 741.6 µmol g −1 h −1 under Xe lamp irradiation. The possible formation mechanism of tubular Co–C 3 N 4 is proposed. Meanwhile, designing unique organic–inorganic hybrid structures may open up a new way for excellent photocatalytic water splitting.
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Food Analytical Methods
·
2019
·Vol. 12
·期 12
·2908-2919
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IF 2.413
Xie Zenghui,Zhang Lanyun,Chen Yanli,Hu Xujia
In this study, novel magnetic molecularly imprinted polymers (MMIPs) with specific adsorption for glutathione were prepared. Based on MMIPs as adsorbents for magnetic solid-phase extraction, we combined magnetic solid-phase extraction with high-performance liquid chromatography (MPSE-HPLC) for the separation, enrichment, and detection of glutathione in nine kinds of wild edible bolete extracts. MMIPs were characterized by Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). In addition, the properties of MMIPs were studied by adsorption isotherm, adsorption kinetic, and selective adsorption experiments. The results showed that MMIPs had high selectivity for glutathione ( K d = 245.33 mL/g), and adsorption time and saturated adsorption capacity were 30 min and 17.88 μmol/g, respectively. Under the optimized conditions, there was a good linear relationship in the concentration range of 100~3000 μg/L, the correlation coefficient R 2 = 0.9997, and the limit of detection (LOD) and the limit of quantitation (LOQ) that were 24.828 μg/L and 82.760 μg/L, respectively. The spiked recovery and RSD were 93.28~103.03% and 2.77~5.11, respectively. We successfully combined MSPE-HPLC for the detection of glutathione in nine kinds of wild edible bolete extracts. It was found that the content of glutathione in Leccinum extremiorientale (L. Vass.) Sing. was the highest (19.800 mg/g) and that in Boletus aereus was the lowest (6.791 mg/g).
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JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·339-345
·
IF 1.947
Zuo Guihong,Wang Anqi,Yang Ying,Huang Hailiang,Wang Fangbiao,Jiang Hongwei,Zhang Lei,Zheng Youjin
Recently, Ag/AgCl has been widely researched by various methods and used as photocatalyst to degrade organic dyes due to its excellent photocatalytic properties under visible light. In this paper, a novel visible-light-driven plasmonic photocatalyst Ag/AgCl@ZIF-8 was successfully prepared by depositing AgCl nanoparticles into the ZIF-8 crystals, and then reducing partial Ag + ions of AgCl nanoparticles to Ag 0 species under UV light irradiation. All as-synthesized samples were characterized by XRD, SEM, TEM, BET and UV–Vis diffuse reflectance spectra. The photocatalytic activity of all as-synthesized samples was evaluated by degradation RhB solution under visible light irradiation. The results show that AgCl nanoparticles are well dispersed and inlaid in the body of ZIF-8 crystals, and partial Ag + ions of AgCl nanoparticles are reduced into Ag 0 species after 30 min of UV light irradiation.The as-synthesized Ag/AgCl@ZIF-8 keeps the high surface area of ZIF-8 and holds the excellent photo-properties of Ag/AgCl. The photocatalytic activity of all as-synthesized sample were evaluated by degradation RhB solution under visible light irradiation. Ag/AgCl@ZIF-8 exhibited the highest photocatalystic activity, which could degrade 99.12% RhB. The synergistic effect of Ag/AgCl and ZIF-8 makes Ag/AgCl@ZIF-8 possible to be used for the degradation of organic dye by using sunlight.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 22
·19928-19939
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IF 2.195
Nan Bingfei,Wu Kun,Liu Yingchun,Xiao Luqi,Chen Weilong,Jiao Enxiang,Tan Zhiyou,Chen Guokang,Lu Mangeng
Inspired by the hierarchical microstructure of nacre, via the surface modification of polydopamine (PDA), nacre-mimicking composite films containing graphene oxide (GO) and different mass ratio (5, 15, 25, 35 wt%) of copper nanowires (CuNWs) were prepared with a solvent-induced assembly strategy. The introduction of PDA not only reduced GO, but also protected the CuNWs from oxidation. 1D CuNWs, as a thermal bridge, was introduced into 2D GO nanosheets to construct an interconnected thermal conduction network. This structure can provide an effective thermal conductive pathway. The CuNWs/GO-PDA film containing 25 wt% CuNWs (25CuNWs/GO-PDA) exhibits excellent in-plane thermal conductivity of 6.841 W/mK and cross-plane thermal conductivity of 0.202 W/mK. A high anisotropy index of about 34 for 25CuNWs/GO-PDA film was obtained. Due to the char forming ability of PDA, and unique nanosheets structure of GO, films exhibit excellent flame retardancy. Micro combustion calorimeter tests confirm dramatically reduced 80.9% of peak heat release rate compared with pristine GO. More importantly, electrical conductivity of composites improved with the increase of CuNWs loading. With the addition of 35 wt% CuNWs, the electrical conductivity reaches 6.43 × 10 6 S/m. This type of bioinspired film with multifunctional properties is expected to be used as a promising candidate for electronic materials.
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