MICROCHIMICA ACTA
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2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wang Juntao,Jiao Caina,Li Menghua,Wang Xiaolan,Wang Chun,Wu Qiuhua,Wang Zhi
Porphyrin-based porous organic polymers (P-POPs) are amorphous polymers linked by strong covalent bonds between the porphyrin subunits that act as building blocks. The authors describe a magnetic P-POP that possesses high surface area, a highly porous structure, and strong magnetism. The MP-POP was employed as a magnetic sorbent for the extraction of benzoylurea insecticides from cucumber and tomato samples prior to their determination by HPLC. The sorbent has a typical sorption capacity of 1.90–2.00 mg∙g −1 . The method exhibits a good linear range (0.8–160 ng·g −1 ), low limits of detection (0.08–0.2 ng·g −1 ), and high method recoveries (81.8–103.5%) for cucumber and tomato samples. The MP-POP has different adsorption capabilities for the benzoylurea insecticides, phenylurea herbicides and phenols compounds, and the adsorption mechanism is found to be based on π-stacking, hydrogen-bonding, and hydrophobic interactions.
A novel magnetic porphyrin-based porous organic polymer was fabricated and used as the adsorbent for the efficient extraction of benzoylurea insecticides.
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JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 53
·期 3
·2054-2064
·
IF 2.599
Lan Ye,Chen Dajun
Silica-based material is regarded as one of the most potential anode materials for lithium ion batteries (LIBs) because of its high specific capacity, low discharge potential, and inexpensive cost. However, low conductivity and poor mechanical property block its practical application. In this work, we adopted a facile method to prepare attapulgite (AT)/polyacrylonitrile (PAN) aerogel precursor and then the precursor was pre-oxidated and carbonized. The natural porous AT with nanofiber structure was used to provide high specific capacity. In addition, PAN was introduced to improve mechanical performance and enhance the electrochemical conductivity. This feasible method could form in situ continuous carbonized phase network structure, which impeded large volume expansion and improved electrochemical performance. As active anode materials of LIBs, the carbonized AT-based aerogels exhibited average discharge capacity of 534.6 mAh g −1 at 100 mA g −1 after 50 cycles and Coulombic efficiency reached over 97%. Overall, the fabrication approach is cost-effective and can be used on a large scale, which may fully take advantage of low-cost AT clay and PAN.
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CELLULOSE
·
2017
·Vol. 24
·期 12
·5327-5339
·
IF 3.417
Gan Linhuo,Zhu Jundong,Lv Li
Acidic carbonaceous solids were synthesized from mass pine alkali lignin via hydrothermal carbonization followed by sulfonation. Hydrothermal carbonization of lignin in the presence of acrylic acid (LAHC-SO 3 H) provided many more carboxylic groups than that in the absence of acrylic acid, allowing subsequent sulfonation to produce a highly active and stable catalyst for cellulose hydrolysis in the [BMIM]Cl-H 2 O solvent system. The hydrochar and catalyst were characterized using field emission scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, thermal gravimetric analysis, Fourier transform infrared spectrometer, Brunauer–Emmett–Teller and acid–base titration. Results showed that a high acid content of 5.48 mmol/g, including carboxylic group (2.85 mmol/g), phenolic hydroxyl group (1.05 mmol/g) and sulfonic acid group (1.58 mmol/g), contributed significantly to the highly efficient hydrolysis of cellulose. Further, it was found that addition of trace water in [BMIM]Cl was favorable to cellulose hydrolysis. The highest yield (75.4%) of total reducing sugar (TRS) obtained in [BMIM]Cl-H 2 O at a mass ratio of 100:1 was more than twice that (36.1%) achieved in [BMIM]Cl without water; the corresponding reaction conditions were 50 mg of microcrystalline cellulose, 30 mg of catalyst, 1.0 g of [BMIM]Cl, 10 mg of H 2 O, reaction temperature of 130 °C and reaction time of 2 h. Furthermore, the TRS yield with 5 cycles for LAHC-SO 3 H was higher than 68.1%, and the catalytic activity of catalyst could be fully recovered (74.0% of TRS yield) easily by regeneration.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Dong Shanshan,Li Mu,Chen Yinguang
Microbial denitrification is the main pathway for nitrogen removal of landfill leachate. Although humic substances (HSs) have been reported in landfill leachate, the effects of HS on denitrification process of activated sludge for leachate treatment are still unknown. In this study, we adopted SAHA as the model HS to study the effects of HS on the denitrification of landfill leachate. After long-term operation at 10 mg/L of Shanghai Aladdin Humic Acid (SAHA), the final nitrate concentration and nitrite accumulation were much lower than the control (5.2 versus 96.2 mg/L; 0.5 versus 34.7 mg/L), and the final N 2 O emission was 13.1% of the control. The mechanistic study unveiled that SAHA substantially changed the activated sludge community structure and resulted in the dominance of Thauera after long-term exposure to SAHA. Thauera could be able to utilize HSs as electron shuttle to improve denitrificattion performance, especially for nitrite reduction. Moreover, SAHA significantly upregulated the gene expressions and catalytic activities of the key enzymes related to denitrification, the reducing power (NADH) generation, and the electron transport system activity, which accelerated nitrogen oxide reduction. The positive effects of HS on denitrification performance were confirmed by the addition of SAHA into real leachate.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 35
·期 1
·99-109
·
IF 2.007
Hu Lei,Yang Mei,Xu Ning,Xu Jiaxing,Zhou Shouyong,Chu Xiaozhong,Zhao Yijiang
An economical and effective approach for the selective transformation of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-dihydroxymethylfuran (DHMF) was developed by catalytic transfer hydrogenation over various magnetic zirconium hydroxides (MZHs). As expected, MZH with a moderate Zr/Fe molar ratio of 2 displayed the highest catalytic activity, resulting in 98.4% HMF conversion and 89.6% DHMF yield at 150 °C for 5 h in the presence of 2-butanol that simultaneously acted as the hydrogen donor and reaction solvent, which was ascribed to its appropriate specific surface area, pore size and acid-base content. Moreover, a plausible reaction mechanism for the catalytic transfer hydrogenation of HMF into DHMF over MHZ(Zr/Fe=2) was also proposed, in which the basic hydroxyl groups with the aid of acidic zirconium metal centers were considered to be responsible for the pivotal hydride transfer via a six-membered ring structure.
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ENDOCRINE
·
2016
·Vol. 56
·期 1
·73-81
·
IF 3.279
Zhu Jing-Jie,Huang Jun-Shang,Wang Ting,Ji Jun,Hou Ai-Jun,Wang He-Yao
Adipose tissue is not only a lipid storage site, but also a well-known endocrine organ. Dysfunction of adipose tissue is associated with irregular lipid metabolism, ectopic lipid accumulation and insulin resistance. It is proposed that modulating on adipose tissue is a reasonable way to ameliorate glucose and lipid metabolism. (±)-sanggenol F (SGF, purity >98.5%) was synthesized as a racemic mixture of natural (+)-sanggenol F. In this study, SGF was found to promote adipocyte differentiation, enhance insulin sensitivity, and upregulate beneficial adipokines expression in 3T3-L1 cells. Furthermore, in vivo study showed that treatment with SGF for 4 weeks improved glucose metabolism, by decreasing fasting blood glucose and enhancing insulin sensitivity. It also improved lipid metabolism, with reduced serum lipid level and ameliorated hepatic steatosis in db/db mice. During the process of target finding, we found that SGF had multiple activities of protein tyrosine phosphatase 1B inhibition, peroxisome proliferator-activated receptor γ and peroxisome proliferator-activated receptor α agonism. These results showed the potential of SGF as a candidate for the therapy of type 2 diabetes.
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Journal of Advanced Ceramics
·
2016
·Vol. 5
·期 4
·298-307
·
IF 0.957
Shen Hongfang,Lu Youjun,Wang Yanmin,Pan Zhidong,Cao Guozhong,Yan Xianghui,Fang Guoli
SrTiO3 nanoparticle (NP) photocatalyst was synthesized with a facile and environmentalfriendly hydrothermal method using tetrabutyltitanate, strontium oxide, and ethanolamine as precursors at low temperature without alkali as mineralizer for the first time. The SrTiO 3 nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and N 2 Brunauer–Emmett–Teller (BET) method. The SrTiO 3 catalyst synthesized at 120 °C (STO-120) exhibited the highest photocurrent intensity among the samples synthesized at different hydrothermal temperatures. The high photocatalytic performance of STO-120 was mainly attributed to the more homogeneous and minimum nanoparticle size, the highest surface area, and the maximum light absorption property among the four different samples. This work presented an applicable and facile method to fabricate a highly active and stable SrTiO 3 photocatalyst for organic pollutant degradation.
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Petroleum Science
·
2016
·Vol. 13
·期 4
·770-775
·
IF 0.901
Yin Liu-Yi,Hu Yu-Feng,Wang Hai-Yan
The effects of organic salts on 1,3,5-trioxane synthesis were investigated through batch reaction and continuous production experiments. The organic salts used include sodium methanesulfonate (CH 3 NaO 3 S), sodium benzenesulfonate (C 6 H 5 NaO 3 S), sodium 4-methylbenzenesulfonate (C 7 H 7 NaO 3 S), and sodium 3-nitrobenzene sulfonate (C 6 H 4 NNaO 5 S). It was shown that the effects of organic salts on the yield of 1,3,5-trioxane in reaction solution and distillate follow the order CH 3 NaO 3 S < C 6 H 5 NaO 3 S < C 7 H 7 NaO 3 S < C 6 H 4 NNaO 5 S, which is inversely related to the charge density of the anions of the organic salts. In comparison with Cl − -based salts such as magnesium chloride, organic salts have the advantages of less formic acid generation and low corrosion. Studies on water activity revealed that the effect of organic salts on the activity of water was quite small at low concentration of organic salts. UV–visible spectroscopy and vapor–liquid equilibrium experiments were performed to uncover the mechanisms that govern such effects. The results showed that the effect of organic salts on the yield of 1,3,5-trioxane relies primarily on their ability to increase the catalytic activity of sulfuric acid and increase the relative volatilities of 1,3,5-trioxane and water and of 1,3,5-trioxane and oligomers.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 3
·793-801
·
IF 2.327
Dong Sheying,Li Miao,Wei Wenbo,Liu Dan,Huang Tinglin
A substantial outstanding challenge in diagnostics and disease monitoring is the ability to assay rapidly and conveniently for protein biomarkers within complex biological media. Bi 2 Se 3 , as an important topological insulator (TI) material, was synthesized by a solvothermal method and characterized structurally. Subsequently, the composite of Bi 2 Se 3 and ionic liquid ([BMIm]BF 4 IL) was used as a sensing interface to cross-link goat anti-human immunoglobulin G (anti-IgG) via glutaraldehyde (GA) to fabricate an Bi 2 Se 3 /IL/GA/anti-IgG-carbon paste electrode (CPE). The nonspecific binding sites were enclosed with bovine serum albumin (BSA) to develop a label-free IgG immunosensor. The result showed that the proposed label-free IgG immunosensor exhibited high specificity with a detection limit of 0.8 ng mL −1 and linear range from 2 to 300, and 300 to 2200 ng mL −1 . Besides, the immunosensor exhibited high specificity for IgG detection, acceptable reproducibility, and stability. Thus, the strategy reported here paved a simple way to design a sensitive and cost-effective sensing platform for extension to other disease biomarkers.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 21
·6920-6925
·
IF 2.371
Wang Jing,Yan Han,Lu Yun
A novel thiophene derivative (Fe–Th) with ferricyanide end group is successfully synthesized. The polythiophene derivative (Fe–PTh) is additionally obtained in aqueous solution by polymerization of Fe–Th, and shows a nanoparticle structure with a diameter from 10 to 100 nm. A simple solid-state electrochromic device is fabricated using the Fe–PTh as electrochromic material, and displays a novel three-color electrochromism from blue, green, and red with the increased potential.
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FIBERS AND POLYMERS
·
2015
·Vol. 16
·期 6
·1303-1311
·
IF 0.881
Alebeid Omer Kamal,Zhao Tao,Seedahmed Ahmed Ibrahim
A new approach for dyeing and functional finishing for cotton fabric using Henna extract and TiO 2 nano-sol was investigated. In this study, 3-chloro-2-hydroxy propyl trimethylammonium chloride was used to substitute metallic mordants (heavy-metal salts) in pre-treating cotton fabric. This eventually will prevent heavy metal pollution as well as obtain dyeing without addition of salt. TiO 2 nano-sol was prepared by sol-gel method using different amounts of tetraisopropyl orthotitanate (TTIP) and applied on cationized cotton fabrics using the same finishing formulation and treatment sequence. Treated fabrics were then dyed with Henna extract at different dyeing temperatures (60 ℃, 80 ℃, and 90 ℃). TiO 2 nanoparticles were characterized by transmission electron microscopy (TEM). The chemical and morphological structures of the dyed fabrics were characterized by attenuated total reflection-Fourier transform infrared (ATR-FTIR), scanning electron microscopy (SEM), and X-ray diffractometry (XRD). Color strength, fastness properties (washing, rubbing, and light), UV-blocking, antibacterial activity, and tensile strength were investigated. Samples treated with TiO 2 and dyed with Henna extract exhibited outstanding enhancement in both the UV protection and antibacterial efficacy with minimal impact on color depth and tensile strength. Enhancement or decrement in the UV protection, antibacterial activity and dyeing properties are governed by the amount of TTIP and the dyeing temperature.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2015
·Vol. 13
·期 1
·1-14
·
IF 4.115
Guo Teng,Zhang Yongtai,Zhao Jihui,Zhu Chunyun,Feng Nianping
Background Lipid-based nanosystems have great potential for transdermal drug delivery. In this study, nanostructured lipid carriers (NLCs) for short-acting alkaloids lappacontine (LA) and ranaconitine (RAN) isolated from Aconitum sinomontanum (AAS) at 69.47 and 9.16% (w/w) yields, respectively, were prepared to enhance percutaneous permeation. Optimized NLC formulations were evaluated using uniform design experiments. Microstructure and in vitro/in vivo transdermal delivery characteristics of AAS-loaded NLCs and solid lipid nanoparticles (SLNs) were compared. Cellular uptake of fluorescence-labeled nanoparticles was probed using laser scanning confocal microscopy and fluorescence-activated cell sorting. Nanoparticle integrity during transdermal delivery and effects on the skin surface were also investigated. Results NLC formulations were less cytotoxic than the AAS solution in HaCaT and CCC-ESF cells. Moreover, coumarin-6-labeled NLCs showed biocompatibility with HaCaT and CCC-ESF cells, and their cellular uptake was strongly affected by cholesterol and lipid rafts. Significantly greater cumulative amounts of NLC-associated LA and RAN than SLN-associated alkaloids penetrated the rat skin in vitro. In vivo microdialysis showed higher area under the concentration–time curve (AUC) 0–t for AAS-NLC-associated LA and RAN than for AAS-SLN-associated alkaloids. Conclusions NLC formulations could be good transdermal systems for increasing biocompatibility and decreasing cytotoxicity of AAS. AAS-NLCs showed higher percutaneous permeation than the other preparations. These findings suggest that NLCs could be promising transdermal delivery vehicles for AAS.
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