JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jing Su,Liuyang Wang,Qixin Lu,Min Li,Yu Guan,Chunxia Wang,Shaohai Fu
Dyes containing cyano group have the advantages of bright colours and high molar absorption. However, most cyano-containing disperse dyes are not used for alkaline dyeing as they are easily hydrolysed under alkali conditions. Herein, cyano-containing disperse dyes for alkaline dyeing were designed by introducing non-hydrolysable phenylethyl and potentially alkali-hydrolysable ethyl benzoate in adjacent positions to the cyano group, and the effect of the adjacent groups on the alkali resistance of cyano-containing dyes was investigated. Polyester fabric (PET) was dyed under different acidic or alkali conditions by the disperse dyes, then the hydrolysis energy barrier of cyano on the dye and the binding energy of dye-dye and dye-PET under the dyeing conditions were calculated via Density Functional Theory (DFT). The results showed that the cyano-containing disperse dyes with an adjacent benzene ring structure had good alkali resistance in a 5 g/L NaOH dye bath. DFT simulations confirmed that the adjacent phenylethyl did not have a significant effect on the hydrolytic energy barrier of the cyano group, while the adjacent ethyl benzoate reduced the hydrolytic energy barrier of the cyano group. The introduction of an adjacent benzene ring reduced the dye-dye binding energy, contributing to the increasement of dyeing rate at the beginning of the dyeing process. The designed cyano-containing dyes with adjacent benzene rings achieved a colour fastness level of 4–5 or above in various acid and alkali conditions.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Meng Song,Jinbo Wang,Xiao Zhang,Jinxue Guo
Seawater electrolysis to produce hydrogen and oxygen is an attractive candidate for renewable energy, but bottlenecks still remain to develop efficient and stable electrocatalysts. Herein, the N-doped carbon enveloped CoP hierarchical core-shell structured nanoarray is fabricated on carbon fiber cloth through a controllable approach. Scanning electron microscope and transmission electron microscope reveal the nanoarray architecture and core-shell structure of CoP@NC. When tested as bifunctional catalysts toward water electrolysis, the sample demonstrates efficient catalysis performances with low HER overpotentials of 136/139 mV and OER overpotentials of 238/244 mV to generate a current density of 100 mA cm −2 in alkaline water/seawater, respectively. The two-electrode system of CoP@NC/CC= |CoP@NC/CC needs low cell voltage of 1.68 V to yield 100 mA cm −2 in alkaline seawater, which can maintain the performance for over 100 h. The charming hierarchical core-shell structure, appropriate components, and specific nanoarray morphology are synergistically responsible for the good electrocatalysis performances.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2024
·Vol. 59
·期 7
·4583-4592
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IF 2.6
Jing Sun,Meng-yao Lv,Shuang-yi Zheng,Hai-long Zhang,Wen-ping Ding,Xue-dong Wang,Jing Du
Summary This research delved into the role of gluten fractions on digestion, physical properties and structure of wheat starch (WS)–lauric acid (LA) system under non-alkaline/alkaline conditions. Results showed that gluten fractions decreased the digestion of WS with LA and gliadin had greater effect on the digestion of WS with LA under non-alkaline/alkaline conditions than glutenin. Specifically, gliadin increased RS content of WS with LA by 70.99% and 84.89%, respectively, under non-alkaline and alkaline conditions. The diminished in WS digestion caused by gluten fractions and LA ascribed to the decrease in swelling power and leaching of starch. Rapid viscosity analyser (RVA) demonstrated that gluten fractions were conducive to WS–LA and/or WS–LA–protein complexes formation and gliadin was more helpful to these complexes' formation than glutenin under non-alkaline conditions. Additionally, gliadin had greater effect on the stability and short-range ordered structure of WS with LA than glutenin. Addition of gliadin resulted in 6.79% and 13.33% of increase in short-range orderliness compared with WS–LA system under non-alkaline and alkaline conditions, respectively. Furthermore, gluten fractions had greater influence on the digestion of WS with LA under alkaline conditions than non-alkaline conditions ascribed to the formation of WS–LA and/or WS–LA–protein complexes with low swelling power and high ordered structure under alkaline conditions. This study provided crucial information on the design of starchy foods with low digestion.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 15
·6105-6109
·
IF 1.938
Fangyuan Wang,Yongxin Li,Wenying Li,Qingfeng Zhang,Jian Chen,Huipeng Zhou,Cong Yu
In the present study, a facile fluorescence turn-on approach for the detection of alkaline phosphatase (ALP) activity has been developed. L-ascorbic acid-2-phosphate (AAP), a substrate of ALP, could be hydrolyzed by ALP to give L-ascorbic acid. L-ascorbic acid then reduced resazurin to resorufin, which resulted in a turn-on fluorescence signal. The fluorescence intensity increase could be directly related to the amount of ALP added to the assay solution. The assay is very sensitive, as 0.12 mU mL−1 ALP could be clearly detected. Sodium orthovanadate (Na3VO4), a well-known ALP inhibitor, was tested, and a clear inhibition effect was observed. The results suggest that our method could be used for ALP activity sensing related various biochemical applications and for the screening of ALP inhibitors.
研究领域:
生物化学
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分析化学
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分子生物学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 3
·1704-1716
·
IF 2.302
Wu Huiqing,Jia Wei,Liu Yuejun
Imidazolium-type hybrid alkaline anion exchange membranes (Im-hybrid AAEMs) were prepared based on poly(2-bromomethyl-,6-methyl-1,4-phenylene oxide) matrix employing 1-vinylimidazole and modified hollow mesoporous silica spheres (mHMSS). 1-Vinylimidazole, which is introduced into the casting system via pre-functionalization, can not only produce imidazolium side groups which impart the resultant membrane with an anion conduction capability, but also help form a crosslinked membrane structure via irradiation with ultraviolet (UV) light, contributing to the membrane stability. Hollow mesoporous silica particles are functionalized with amino groups and then incorporated into the membrane for the enhanced compatibility and membrane stability. The Im-hybrid AAEMs exhibit an improved alkaline stability at a high pH solution and elevated temperature. The effects of the amount of 1-vinylimidazole, UV crosslinking time, and loading of mHMSS on the membrane properties were investigated. The results illustrate that Im-hybrid AAEMs with the mHMSS loading of 0.5 wt% possess the best overall performance including enhanced membrane stability and suitable conductivity, which are critical for alkaline fuel cells applications.
研究领域:
材料科学
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化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 9
·4637-4643
·
IF 5.503
Chun Hu,Wei Zhao,Fuqiang Huang,Jiacheng Wang
Highly active and stable electrocatalysts that can work well in alkaline media are essential for industrial water electrolysis. Herein, we have reported the growth of P and Co co-doped Ru hybrids (RuCo–P) on carbon cloth (CC) through a hydrothermal treatment and the following phosphorization. The modification of Ru by Co and P doping can tune the electronic structure for efficient water dissociation and hydrogen desorption in alkaline solution. The resulting RuCo–P/CC achieves a record low overpotential of ∼4 mV to reach a current density of 10 mA cm−2 for the hydrogen evolution reaction (HER) in 1 M KOH solution, and also shows a small Tafel slope (43 mV dec−1) and outstanding long-term stability. The activity of RuCo–P/CC is significantly superior to that of the commercial Pt/C benchmark and other carbon cloth-supported transition metal-based catalysts. The remarkable alkaline HER performance of RuCo–P/CC could be attributed to the synergistic doping of both Co and P that can effectively reduce the water dissociation barrier and optimize the hydrogen adsorption free energy, respectively.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Yukun Huang,Yangbo Geng,Guihong Han,Yijun Cao,Weijun Peng,Xiaofeng Zhu,Ting-an Zhang,Zhihe Dou
A new route for selective recovery of zinc from hazardous zinc plant purification residue was proposed by alkaline leaching process. The thermodynamic analysis revealed that by controlling solution pH in the range from 14.30 to 16.78 at 25 °C, basic zinc sulfate can be converted to ZnO 2 2− instead of Zn(OH) 2 , while Cd will enter into alkaline leaching residue as a hydroxide. It is feasible to leach selectively Zn and to separate it with Cd by alkaline leaching, and the experimental results confirm that. Under the conditions of NaOH concentration of 3 mol/L, L/S of 20 ml/g, temperature of 40 °C, and time of 50 min, LR of Zn reached 96.14% while them of Pb and Cd were only 0.66% and 2.83% respectively. ZnO with hexagonal wurtzite structure and Cd(OH) 2 were the main phases of leaching residue. They crystallized and adhered to the surface of leaching residue particles, which result in the loose and random particle morphology. The findings confirm that alkaline leaching is efficient in separation of Zn and Cd in ZPPR. In addition, nano-ZnO with flowerlike was synthesized with the zinc-rich leaching solution by precipitation method and the its photocatalytic property was similar to that of nano-ZnO purchased.
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Qiang Bao,Wenhui Feng,Yunfeng Hu,Zhenlu Wang,Guoliang Wu,Zhirui Chen,HaoCheng Li,Chenguang Shi
In this work, a series of alkaline earth metal-modified manganese oxide catalysts were prepared via the impregnation method and applied to the oxidative coupling reaction of alcohols and amines to imine. The prepared catalysts were characterized by X-ray diffraction (XRD), N2-adsorption, field emission-scanning electron microscopy (FE-SEM), H2 temperature-programmed reduction (H2-TPR), NH3-temperature-programmed desorption (NH3-TPD), CO2-temperature-programmed desorption (CO2-TPD) and X-ray photoelectron spectroscopy. Among the catalysts, Ba/MnO2 showed the best catalytic performance in the reaction and exhibited the highest Mn3+/Mn4+ ratio, surface weak basic sites and a relatively small number of weak acidic sites. Lattice oxygen mobility and Mn3+/Mn4+ ratio were found to play important roles in the catalytic activity of aerobic reactions. The weak and medium basic sites on the catalyst surface can further promote the alcohol–amine oxidative coupling process, as they serve as active centers for the activation of benzyl alcohol, which is the rate-determining step for this oxidative coupling reaction.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Xingmao Jiang,Shuang Zhu,Jiajun Gao,Yaqian Yu,Chunyan Xiong,Chunxi Li,Weimin Yang
Polyethylene glycol [PEG, H(OCH 2 CH 2 ) n OH] like PEG-600, a green extractant for organic N-compounds in fuel oil, was very active for non-basic nitrogens but not effective for basic ones. Modification of PEG that replaced –OH group with –OCH 2 COOH group can produce HOOCCH 2 (OCH 2 CH 2 ) n OCH 2 COOH (dcPEG). For denitrogenation, dcPEG-600 was highly effective for both basic and non-basic nitrogens. N-distribution coefficient [ D N , (μg N ·g dcPEG −1 )/(μg N ·g oil −1 )] of dcPEG-600 to n -octane can reach as high as 200 for indole, 92.6 for pyrrole, 42.0 for quinoline, and 81.5 for pyridine, respectively. Besides, denitrogenation selectivity of dcPEG-600 to toluene ( D N / D toluene ) can amount to 462 for indole, 230 for pyrrole, 146 for quinoline, and 366 for pyridine, respectively. The high performance was ascribed to contribution of active O atom on ether group and active H atom on –COOH group. The active O atom (Lewis basic site) formed H-bond with the non-basic nitrogen (Brønsted acid). The active H atom (Brønsted acidic site) not only interacted with the basic one (Lewis base) but also brought in the good selectivity. Moreover, dcPEG-600 was still effective for real oil and could be recycled for several times without the denitrogenation performance significantly decreasing.
研究领域:
化学工程
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环境科学
·
燃料化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Marine Science and Engineering
·
2022
·Vol. 10
·期 1
·93
·
IF 2.744
Yuhua Gao,Xiaoyuan Wang,Xianwen Fang,Xuebo Yin,Lu Chen,Jianling Bi,Yao Ma,Shuai Chen
Fluorine and chlorine are important tracers for geochemical and environmental studies. In this study, a rapid alkaline digestion (NaOH) method for the simultaneous determination of fluorine and chlorine in marine and stream sediment reference samples using ion chromatography is developed. The proposed method suppresses the volatilization loss of fluorine and chlorine and decreases the matrix effects. The results are in good agreement with fluorine ~100%, chlorine ranging from 90 to 95% of the expected concentrations. The detection limits of this method were 0.05 μg/g for fluorine and 0.10 μg/g for chlorine. This method is simple, economical, precise and accurate, which shows great potential for the rapid simultaneous determination of fluorine and chlorine in large batches of geological and environmental samples commonly analyzed for environmental geochemistry studies.
研究领域:
地球化学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3771
·
IF 5.719
Shizhuo Wang,Jikang Jiang,Minyan Gu,Yuanbo Song,Jiang Zhao,Zheng Shen,Xuefei Zhou,Yalei Zhang
To substitute fossil resources, it is necessary to investigate the conversion of biomass into 1,2-propanediol (1,2-PDO) as a high-value-added chemical. The Pt/deAl-Beta@Mg(OH)2catalytic system is designed to obtain a higher 1,2-PDO production yield. The optimal yield of 1,2-PDO is 34.1%. The unique shell-core structure of the catalyst demonstrates stability, with a catalytic yield of over 30% after three times of use. The primary process path from glucose to 1,2-PDO, glucose-hexitol-1,2-PDO, is speculated by the experiments of intermediate product selectivity. The alkaline catalytic mechanism of the reaction process is elucidated by studying catalyst characterization and analyzing different time courses of products. The introduction of Mg(OH)2improves the target yield by promoting the isomerization from glucose to fructose and retro-aldol condensation (RAC) conversion, with pseudo-yield increases of 76.1% and 42.1%, respectively. By studying the processes of producing lactic acid and 1,2-PDO from glucose, the glucose hydrogenolysis flow chart is improved, which is of great significance for accurately controlling 1,2-PDO production in industrial applications. The metal, acid, and alkali synergistic catalytic system constructed in this paper can provide a theoretical basis and route reference for applying biomass conversion technology in practice.Keywords:1,2-propanediol;alkaline modification;core–shell catalyst
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Guimei Zhou,Wenjun Yan,Shufan Yan,Dandan Gao,Debin Zeng,Dongdong Li,Dewen Zeng
Solvent extraction of lithium by β-diketones from alkaline brine has been known to be an efficient process. However, its relatively high working pH, consequently the high alkaline consumption and substantial dissolution loss in raffinate, limit its industrial application. Herein, a novel lithium extractant, i.e., 2-hydroxy-5-nitro-4- n -octoxy-benzophenone (referred to as N531), was proposed, which can extract lithium at relatively lower pH with remarkable low alkaline consumption and dissolution loss. Exactly, the pH corresponding to half lithium extraction is 8.5, and the Li/Na separation factor is ~500. The extractant concentration in the raffinate varied from 0.8 to 9.3 mg L −1 , depending on the pH and salinity. An application case was given to extract lithium from the raw brine of Zabuye salt lake, indicating that N531 is a commercially prospective extractant to extract lithium from alkaline brine.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）