JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaolong Zhang,Lei Chen,Yang Liu,Yaxin Wang,Qian Duan
We report a facile one-step, co-chemical reduction controlled synthesis of Co x Pt 100-x (x = 25, 35, 50, 65, 75) alloy nanoparticles (NPs). Alloy NPs with Co to Pt atomic ratios of 25/75, 50/50 and 75/25 were found to exhibit a pure phase and superpara-magnetism with a small NP size distribution. The saturation magnetization for Co 75 Pt 25 NPs (55.17 emu/g) was highest than that for Co 25 Pt 75 NPs (47.58 emu/g) and Co 50 Pt 50 NPs (32.38 emu/g), confirmed the best magnetic response of Co 75 Pt 25 NPs. Furthermore, the average crystallite sizes for Co x Pt 100- x (x = 25, 50, 75) alloy NPs is 5.72 nm, 5.43 nm and 5.6 nm, respectively. The observation of an obviously reduced catalytic reduction time and increased rate constant confirmed that the Co x Pt 100- x (x = 25, 50, 75) alloy NPs exhibit intensive performance for the catalytic reduction of 4-nitrophenol (4-NP). Moreover, compared with Co 25 Pt 75 and Co 50 Pt 50 alloy NPs, the Co 75 Pt 25 alloy NPs exhibit short reaction times for catalytic reduction due to their stability in aqueous solution and short induction time. The recycling ability of the alloy catalysts was certified with high yields in four reaction cycles.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2513-2526
·
IF 3.186
Cui Kai,Qian Wei,Shao Zhengjiang,Zhao Xiuge,Gong Honghui,Wei Xinjia,Wang Jiajia,Chen Manyu,Cao Xiaoming,Hou Zhenshan
Furfural (FFR) is one of the most important biomass-derived chemicals. Its large-scale availability calls for the exploration of new transformation methods for further valorization. Herein, we demonstrate that Ru nanoparticles (Ru NPs)-supported on a sulfonated carbon layer coated SBA-15 can be employed as an efficient bi-functional catalyst for one step conversion of FFR into 1,4-pentanediol (1,4-PeDO). The optimum bi-functional catalyst can afford the full the conversion of FFR and 86% selectivity to 1,4-PeDO. The catalysts have been characterized thoroughly by using a complementary combination of powder X-ray diffraction, N 2 adsorption–desorption, scanning/transmission electron microscopy, Fourier transform infrared spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy. The characterization revealed that acidic groups (–SO 3 H) have been introduced on the surface of the carbon layer coated SBA-15 support after sulfonation with 98% H 2 SO 4 and the surface acidity can be tuned facilely by the sulfonating time. Meantime, Ru(0) sites was highly dispersed via an impregnation and sequential reduction and directly adjacent to the surface –SO 3 H group. There existed an electronic interaction between Ru(0) sites and sulfonic groups, in which the electronic transfer from sulfonic sites to Ru(0) sites occurred. Brönsted acid sites (–SO 3 H) have a significant influence on the FFR conversion and the selectivity to 1,4-PeDO. The ordered mesoporous structure, the appropriate density of acid sites and the electron-rich Ru(0) sites accounted for the the excellent performance of the catalyst for an efficient production of 1,4-PeDO from FFR. Graphic Abstract
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CHEMICAL PAPERS
·
2020
·Vol. 74
·期 7
·2049-2057
·
IF 1.68
Ren Peng,Li Yang,Wang Zhifen,Geng Yanxia,Yu Tao,Hua Rong
Thorium is much more abundant than uranium in nature and has become one of the important potential energy sources in the future. It is because that a thorium-232( 232 Th) nucleus has the ability to produce a uranium-233( 233 U) nucleus by absorbing a neutron. The aim of this paper is to investigate the extraction and separation of thorium ions and uranyl ions from aqueous solution with N,N’ -dimethyl- N,N’ -dioctyl-4-oxaheptanediamide (DMDOHA) into ionic liquids of 1-methyl-3-butylimid-azolium bis(trifluoromethanesulfonyl)imide ([C 4 mim][NTf 2 ]). The results show that the extractant DMDOHA has a good affinity toward thorium ions than uranyl ions in the present system, the maximum value of separation factor SF Th(IV)/U(VI) is 21.9 at pH 2.24. The extraction process of thorium ions and uranyl ions was confirmed to proceed by cation-exchange extraction mechanism. The DMDOHA extractant formed a major 3:1 complex with thorium ion and a major 2:1 complex with uranyl ion based on the relationship between log[DMDOHA] with logD.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Xinyu Liu,Hongxue Li,Huaxu Zhou,Junjie Liu,Lequn Li,Jiyang Liu,Fei Yan,Tao Luo
4-Aminophenol (4-AP) served as the drug intermediates has been widely used or found in pharmaceutical preparations. Therefore, direct and rapid determination of 4-AP content in pharmaceuticals is highly important for human health. In this work, we demonstrate a simple and fast electrochemical method for direct analysis of 4-AP in pharmaceuticals by using the indium tin oxide (ITO) electrode modified with vertically-ordered mesoporous silica-nanochannel films (VMSF). Arising from the vertically-aligned nanochannels and high porosity of VMSF, 4-AP could permeate the VMSF and transfer to the underlying electrode surface, ultimately giving rise to the electrochemical signal. By using the differential pulse voltammetry (DPV) method, the VMSF/ITO sensor was able to detect 4-AP in a wide linear range from 0.5 μM to 400 μM. The obtained limit of detection was calculated as 0.32 μM. Owing to the good anti-fouling and anti-interference ability of VMSF, direct analysis of 4-AP in pharmaceuticals was achieved, without any complex sample pretreatments.
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JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Xiqiang Tian,Muhammad Zahid,Jiang Li,Wang Sun,Xiaoyu Niu,Yujun Zhu
The addition of a suitable co-catalyst is an encouraging way to enhance the catalytic performance of Pd based catalyst with low content. Herein, we describe an easy synthesis of Mo 2 N-TiO 2 with well-dispersed Mo 2 N nanoparticles through one pot evaporation-induced self-assembly and nitridation treatment method. Moreover, a green bio-reductive approach with Catalpa Fruit ( CF ) extract was adopted to fabricate Pd/Mo 2 N-TiO 2 catalysts for promoting selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as model reaction. Among these Pd/Mo 2 N-TiO 2 catalysts, 0.8 wt%Pd/Mo 2 N-TiO 2 exhibits significantly high catalytic activity for selective hydrogenation of various nitrophenols and cinnmaldehyde. Importantly, the catalytic activity of the catalyst prepared by the reduction method of the CF extract is higher than that prepared by the reduction method of NaBH 4 . A serials of characterization, including XRD, N 2 adsorption–desorption, TEM, XPS, CO chemisorption and CO-FTIR etc., was carried out to investigate the influence of the prepared method on the surface Pd species and activity. The high performance can be attributed to the specific nanostructure characteristics of the catalyst and the good synergistic effect between Pd and Mo 2 N, improving the dispersion of Pd nanoparticles atoms and the exposure of more active Pd atoms (surface Pd 0 species) on 0.8 wt%Pd/Mo 2 N-TiO 2 due to the CF extract as reductant.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hao Guo,Tian Fan,Wenqin Yao,Wenhu Yang,Ning Wu,Hui Liu,Mingyue Wang,Wu Yang
Herein, a novel electrochemical sensor based on ZIF-67/MWCNT-COOH/Nafion composite was designed and prepared for simultaneous detection of 4-aminophenol (4-AP) and acetaminophen (AMP). The electrochemical behaviors of the 4-AP and AMP on the ZIF-67/MWCNT-COOH/Nafion electrode were explored via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results exhibited that the designed electrochemical sensor possessed superior electrocatalytic activity for 4-AP and AMP, which was attributed to the highly ordered porous structure of ZIF-67, the outstanding electrical conductivity and high electrocatalytic activity of MWCNT-COOH. Under optimization conditions, the DPV response of the prepared electrode depicted a wider linear response concentration range of 0.2 to 200 μM for 4-AP, and 0.1 to 100 μM for AMP, respectively. And the lower detection limits (LOD) of 0.01 and 0.07 μM were obtained for 4-AP and AMP, respectively. More importantly, the acquired electrode was applied to Yellow river water and Paracetamol tablets for analysis of 4-AP and AMP, which exhibited satisfying recovery of 98.2% ~ 106.7% for 4-AP and 94.7% ~ 99.6% for AMP, respectively. In a word, the constructed electrochemical sensing platform delivered a promising potential in real application.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Haiyan Zhou,Yizuo Li,Rui Jiang,Xianlin Wang,Yuanshan Wang,Yaping Xue,Yuguo Zheng
R -2-(4-hydroxyphenoxy)propionic acid ( R -HPPA) is a key intermediate for the synthesis of classic herbicides with high selectivity against grassy weed. The main route for R -HPPA biosynthesis is to hydroxylate the substrate R -2-phenoxypropionic acid ( R -PPA) at C-4 position with microbes. In order to provide sufficient R -PPA for the industrial production of R -HPPA, an effective R -PPA synthesis method was established and optimized in this work. The synthesis process mainly consisted of two steps: (1) synthesis of S -2-chloropropionic acid from L-alanine via diazotization and chlorination reactions; and (2) synthesis of R -PPA from S -2-chloropropionic acid and phenol via etherification reaction. The optimal reaction conditions were as follows: HCl: NaNO 2 : KI: L-Ala = 2.0: 1.2: 0.7: 1.0 (in molar), 125 °C reflux for 1.5 h, with KI as catalyst, and KI: S -2-chloropropionic acid: phenol = 0.075: 1.2: 1.0 (in molar). Under these conditions, an improved molar conversion rate (74.9%, calculated in phenol) was achieved. After extraction using anionic exchange resin Amberlite IRA-400 (CI), R -PPA product with a purity of 95.08% was obtained. The purified R -PPA was identified and evaluated in the application of the biotransformative production of R -HPPA. The results indicated that the synthesized R -PPA supported the R -HPPA biosynthesis with a comparable yield as that of the standard R -PPA. The R -PPA synthesis method provided herein exhibited the advantages of low price and easy availability of raw materials, less toxicity of reagents, simple manipulations, and low equipment/instrument requirements.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Yuli Shi,Haojian Zhang,Xiaomin Hong,Xiaodong Wang
Four solvents (ethanol, isopropanol, ethylene glycol (EG), and N,N-dimethylformamide (DMF)) that can be mixed with water in any ratio were selected to determine the dissolution performance of 7-amino-4-methylcoumarin by the classical shake-flask method. The measured temperature range began at 278.15 K and ended at 303.15 K, and the pressure environment was controlled at standard atmospheric pressure (101.1 kPa). Results reveal that with the addition of organic solvents, the solubilization effect of 7-amino-4-methylcoumarin was very significant and the larger the amount of addition, the more obvious was the effect of solubilization. Not only that, the temperature change had a non-negligible effect on the dispersion of 7-amino-4-methylcoumarin; the temperature increased monotonically, and the better was the dissolution. When the external conditions were kept constant, the addition of DMF made the solubilization effect of 7-amino-4-methylcoumarin most obvious among all organic solvents used. This study involved three models, including the Jouyban–Acree model and its two variants (van’t Hoff–Jouyban–Acree model and Apelblat–Jouyban–Acree model), which were used to correlate the solubility data of 7-amino-4-methylcoumarin in aqueous cosolvent mixtures. The relative average deviation (RAD) and root-mean-square deviation (RMSD) reaches to 3.47 × 10–2 and 1.79 × 10–3 rooting in the van’t Hoff–Jouyban–Acree model. The relevant parameters obtained through model calculation and experimental means are essential for product synthesis, separation, and purification processes.
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高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Huiling Cai,Liquan Yao,Yingsen Xia,Chunyan Dao,Jianmin Li,Limei Lin,Zhiping Huang,Guilin Chen
In this work, a three-step (sulfurization-selenization-sulfurization) annealing process was designed to optimize the surface constitution of Cu 2 ZnSn(S, Se) 4 (CZTSSe) thin films, which was prepared by oxide nanoparticles-based approach. The devices with the Mo/CZTSSe/CdS/ZnMgO/ZnO:Al/Al structure were fabricated and their performances were studied. The additional post-sulfurization with low toxicity sulfur powder has negligible impact on the structure, morphology and composition of CZTSSe bulk, however, it improves open circuit voltage of device significantly. The open circuit voltage can be increased significantly from 408 mV (without surface sulfurization) to 497 mV (with surface sulfurization). This is benefited from the increase of surficial sulfur content and the broadening of the surface band-gap of the CZTSSe thin film. The result is confirmed by X-ray photoelectron spectroscopy analysis. Such a crucial three-step annealing process promotes the power conversion efficiency from 4.71% (2-step) to 6.37% (3-step), which is the champion efficiency of oxide precursor derived CZTSSe solar cell.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Chunmei Wang,Hai Qiang Li,Zhe Wang,Jingmei Xu,Chang Liu,Wenchang Liu,Zhaoyu Chen,Xinming Du
A series of sulfonated poly(arylene ether ketone sulfone)s polymer having a degree of sulfonation of 80% and a carboxyl group in the side chain (C-SPAEKS) were prepared by polycondensation . The 4-aminopyridine grafted sulfonated poly(arylene ether ketone sulfone)s polymer membranes (SPPs) were prepared by amidation reaction with the carboxyl group to immobilize 4-aminopyridine on the side chain. The 1 H NMR results and Fourier transform infrared of SPP membranes demonstrated the successful grafting of the 4-aminopyridine. Proton conductivity , water absorption, swelling ratio, and thermal stability of different proportions of SPP membranes were investigated under the different conditions. With the increase of pyridine grafting content, the methanol permeability coefficient of the membrane decreased significantly from 8.17 × 10 −7 cm 2 s −1 to 8.92 × 10 −8 cm 2 s −1 at 25 °C. And, the proton conductivity and relative selectivity of the membrane were positively correlated with the grafted pyridine content. Among them, the SPP-4 membrane exhibited the highest proton conductivity of 0.088 Scm −1 at 100 °C. The relative selectivity increased from 4.73 × 10 4 S scm −3 to 9.84 × 10 4 S scm −3 .
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yinxuan Lin,Jiao Yu,Meng Wang,Lingling Wu
The combined pollution of antibiotics and heavy metals has attracted a worldwide attention in the recent years. 4-epianhydrotetracycline (EATC) is the major degradation product of tetracycline (TC), which has been detected frequently in environment and its concentration is even higher than TC under some circumstances. Cadmium (Cd) is a common heavy metal contaminant and has highly toxic to organisms, plants and humans even at low doses. In the present study, zebrafish ( Danio rerio ) embryo toxicity test was performed to investigate the single and combined effects of EATC and Cd on aquatic organisms. Exposure to EATC and Cd at environmentally relevant concentrations had a series of hazardous impacts on the embryonic development , including lethality , hatching rate, heart rate and teratogenic effects . Compared to the contaminant existed alone, combined pollution produced stronger toxicity, which appeared as the decreasing of heart rate and hatching rate, and the increasing of malformation of zebrafish embryos. After 96 h exposure, the reactive oxygen species (ROS) levels in zebrafish embryos were increased significantly, revealing that EATC-Cd co-exposure resulted in potential oxidative stress-induced damage. Acridine orange (AO) staining showed that combined exposure resulted in stronger cell apoptosis. The potential health risks of the combined pollution of EATC and Cd should be paid more attention to higher level vertebrates and humans.
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PubMed
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2015
·
IF 3.447
Feifei Li,Guoli Wu,Huixia Zheng,Li Wang,Zhengbao Zhao
A glycoside prodrug of 4-aminosalicylic acid (4-ASA) with d -glucose was synthesized for targeted drug delivery to inflammatory bowel. The in vitro assessment of 4-aminosalicylic acid-β-O-glucoside (4-ASA-Glu) as a colon-specific prodrug was studied using colitis rat with the healthy one as control. The stability studies in aqueous buffers (pH 1.2, 6.8 and 7.4) indicated that 4-ASA-Glu was stable over a period of 12 h. The incubation of 4-ASA-Glu with cecal or colonic contents of healthy rats at 37 °C released 4-ASA in 77 or 80% of the dose in 12 h, respectively. The amount of 4-ASA liberated from the incubation of 4-ASA-Glu in cecal or colonic contents of colitis rats at 37 °C was 69 or 79% in 12 h respectively, while less than 9% 4-ASA was detected from the incubation of 4-ASA-Glu with the homogenates of stomach or small intestine . The curative effect of 4-ASA-Glu was evaluated in 2, 4, 6-trinitrobenzenesulfonic acid (TNBS) induced experimental colitis model in male Sprague–Dawley (SD) rats. It was found that 4-ASA-Glu possess significantly ameliorate effect than sulfasalazine , oral 4- and 5-aminosalicylic acid.
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