INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xingang Li,Qingyu Zhang,Hong Li,Xin Gao
To solve the problem of catalyst recovery, high investment, and high energy consumption in the traditional manufacturing process of triethylene glycol di-2-ethylhexoate (TGDE), sulfated zirconia (HND-32) and reactive distillation (RD) were used in this work. Kinetics experiments for the esterification of triethylene glycol and 2-ethylhexanoic acid catalyzed by sulfated zirconia were performed at 463.15–493.15 K. The pseudo-homogeneous model was used to obtain the kinetics equation. Then, the process analysis results of the RD column indicate that there is an optimal theoretical plate number of the stripping section to obtain the highest yield of TGDE. The yield of TGDE can be enhanced to 98.15%, and 98.5 wt % TGDE can be obtained in the bottom of the RD column when the feed molar ratio is the stoichiometric ratio.
研究领域:
化学工程
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Weiwei Mao,Haiping He,Pengcheng Sun,Zhizhen Ye,Jingyun Huang
A facile and scalable in situ microelectrolysis nanofabrication technique is developed for preparing cross-linked Ni(OH)2 nanosheets on a novel three-dimensional porous nickel template (Ni(OH)2@3DPN). For the constructed template, the porogen of NaCl particles not only induces a self-limiting surficial hot corrosion to claim the “start engine stop” mechanism but also serves as the primary battery electrolyte to greatly accelerate the growth of Ni(OH)2. As far as we know, the microelectrolysis nanofabrication is superior to the other reported Ni(OH)2 synthesis methods due to the mild condition (60 °C, 6 h, NaCl solution, ambient environment) and without any post-treatment. The integrated Ni(OH)2@3DPN electrode with a highly suitable microstructure and a porous architecture implies a potential application in electrochemistry. As a proof-of-concept demonstration, the electrode was employed for nonenzymatic glucose sensing, which exhibits an outstanding sensitivity of 2761.6 μA mM–1 cm–2 ranging from 0.46 to 2100 μM, a fast response, and a low detection limit. The microelectrolysis nanofabrication is a one-step, binder-free, entirely green, and therefore it has a distinct advantage to improve clean production and reduce energy consumption.
研究领域:
材料科学
·
电化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Baosheng Li,Xue Ma,Yuying Xin,Zoltán Major,Xianfa Zhang,Tingting Wang,Lihua Huo,Xiaoli Cheng,Yingming Xu
Real-time detection and degradation of chemical warfare agents have great importance in both human healthcare and environmental protection. Herein, hierarchical Fe 2 O 3 nanotube arrays were constructed by a simple in situ solvothermal method for effective monitoring of 2-chloroethyl ethyl sulfur enigma (2-CEES). The resultant Fe 2 O 3 sensor exhibited ultrahigh response (9.6) and short response time (3.7 s) to 10 ppm 2-CEES at 170 ℃. The sensor also behaved low detection limit (30 ppb), good stability, and high moisture resistance . Notably, Fe 2 O 3 nanotube arrays demonstrated high degradation capacity (95.2%) (100 ppm, 10 min). Such excellent performance of the portable Fe 2 O 3 sensor for 2-CEES comes from the synergistic effect of multiple microstructural features , active sites, and surface-adsorbed oxygen species at operating temperature. The 2-CEES sensing mechanism of Fe 2 O 3 nanotube arrays has been discussed in detail. This work offers guidance for designing high-performance sensing materials to realize efficient detection of chemical warfare agents.
研究领域:
材料科学
·
环境监测
·
化学传感
·
纳米技术
·
公共安全
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4439-4448
·
IF 2.817
Huang Xiangjin,Li Jianwen,Xie Chunsheng,Zhang Huasheng,Wei Shoulian,Lai Wenfeng,Xian Shaoling,Huang Sicong
Herein, a nanocomposite comprising polyvinyl pyrrolidone (PVP) and cobalt(II) hydroxide (Co(OH) 2 ) nanoparticles (PVP–Co(OH) 2 ) was synthesized via a hydrothermal method and used for detection of Cu(II) ions. Using PVP grafted nanosized Co(OH) 2 as a surfactant could decrease the aggregation and reduce the particle size. The conducted morphology investigations showed that PVP–Co(OH) 2 nanocomposite was composed of small spherical particles with a diameter of 40–80 nm that could accelerate mass diffusion and favor the deposition-stripping process of Cu(II) ions. High catalytic activity of Co(OH) 2 and good affinity of PVP to Cu(II) ions synergistically enhances sensing performance of the PVP–Co(OH) 2 nanocomposite-modified electrode than Co(OH) 2 - and PVP-modified electrodes. A linear response was obtained for Cu(II) ion concentration over a range of 1.0–90.0 μg/L, with a detection limit of 0.26 μg/L (S/N = 3). The proposed electrode exhibited good performance in terms of selectivity, stability, and reproducibility. It was also employed to detect Cu(II) ions in water and food samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Yao Yueliang,Tse Yuen Cheong,Lai Samuel Kin-Man,Shi Yixiang,Low Kam-Hung,Au-Yeung Ho Yu
Responsive synthetic receptors for adaptive recognition of different ionic guests in a competitive environment are valuable molecular tools for not only ion sensing and transport, but also the development of ion-responsive smart materials and related technologies. By virtue of the mechanical chelation and ability to undergo large-amplitude co-conformational changes, described herein is the discovery of a chameleon-like [2]catenane that selectively binds copper(I) or sulfate ions and its associated co-conformational mechanostereochemical switching. This work highlights not only the advantages and versatility of catenane as a molecular skeleton in receptor design, but also its potential in constructing complex responsive systems with multiple inputs and outputs.
研究领域:
超分子化学
·
分子识别
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Progress in Natural Science-Materials International
·
2022
·
IF 4.269
Yu Zhang,Xueai Teng,Zequn Ma,Rongming Wang,Woon-Ming Lau,Aixian Shan
Cu 2 O is an ideal template material for the preparation of transition metal hydroxide/oxyhydroxides with oxygen evolution reaction (OER) enhanced catalytic performance. Here, inspired by Pearson's principle, Cu 2 O wires were prepared and used as a sacrificial template to prepare Ni(OH) 2 ·0.75H 2 O hollow tubes (Ni(OH) 2 HTs) with highly improved surface roughness. Benefiting from unique structural advantages, the Ni(OH) 2 HTs showed excellent catalytic activity, rapid kinetics and a long-term stability as the OER catalyst, where an overpotential of only 207 mV was required to drive a current density of 10 mA cm −2 , an ideal kinetics with a Tafel slope as 79.8 mV dec −1 was calculated, and no obvious attenuation in chronoamperometry was discovered after operation for 24 h. This paper provides a novel template-assisted strategy to prepare high-performance transition metal-based OER catalysts possessing hollow and tubular structures.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2021
·Vol. 5
·期 6
·2000297
·
IF 6.271
Ai-Di Cheng,Min-Hua Zong,Guang-Hui Lu,Ning Li
Laccase coupled with 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) is a well-known catalytic system for the oxidation of alcohols to the carbonyl compounds. In this work, a simple yet effective solvent engineering strategy is developed to enable aromatic alcohols/aldehydes to be efficiently oxidized to carboxylic acids by a laccase-TEMPO system. Citrate buffer (100–300 m m , pH 6) rather than the widely used acetate buffer (pH 4–5) proves to be optimal for this purpose. The roles of citrate are discussed in laccase-TEMPO-catalyzed synthesis of carboxylic acids. 5-Hydroxymethylfurfural (HMF) of 200 m m is oxidized to 2,5-furandicarboxylic acid (FDCA), a top-value biobased chemical in the polymer industry, in 28 h with a yield of up to 97%. Of the 18 substrates examined, 11 alcohols are converted to target carboxylic acids with >90% yields by this method, with 2 alcohols giving >60% yields of carboxylic acids. Gram-scale preparation of FDCA and 5-methyl-2-pyrazinecarboxylic acid, an important drug intermediate, is demonstrated with total turnover numbers up to 110 000 for laccase and space-time yields up to 1.0 g/(L•h). This chemoenzymatic approach may be a promising alternative to traditional chemical oxidations for the synthesis of carboxylic acids.
研究领域:
生物化学
·
酶工程
·
绿色化学
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2024
·Vol. 10
·期 4
·121
·
IF 4.6
Ao Xiang,Deyou Shi,Peng Chen,Zhongjun Li,Quan Tu,Dahui Liu,Xiangguang Zhang,Jun Lu,Yan Jiang,Ze Yang,Pei Hu
Developing cost-effective cathode materials is conducive to accelerating the commercialization of sodium-ion batteries. Na4Fe3(PO4)2P2O7(NFPP) has attracted extensive attention owning to its high theoretical capacity, stable structure, and low cost of raw materials. However, its inherent low conductivity hinders its further application. Herein, carbon-coated NFPP nanospheres are anchored to crumpled MXene nanosheets by an electrostatic self-assembly; this cross-linked structure induced by CTAB not only significantly expands the contact area between particles and improves the electronic conductivity, but also effectively reduces the aggregation of NFPP nanoparticles. The as-designed Na4Fe3(PO4)2(P2O7)@C/Ti3C2Tx(NFPP@MX) cathode exhibits a high discharge capacity (106.1 mAh g−1g at 0.2 C), good rate capability (60.4 mAh g−1at 10 C), and a long-life cyclic stability (85.2% capacity retention after 1000 cycles at 1 C). This study provides an effective strategy for the massive production of high-performance NFPP cathodes and broadens the application of MXene in the modification of other cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yiming Yao,Yue Meng,Hongwen Sun
Polyfluoroalkyl phosphoric acid diesters (diPAPs) have been widely and increasingly detected in various environmental mediums. The degradation of diPAPs brings perfluoroalkyl carboxylic acids (PFCAs) concerned of adverse health effects. DiPAPs mainly occur in particulate matter in ambient air and their photo-degradation behaviors have not been investigated. In this study, heterogeneous photo-degradation of 6:2 diPAP was studied on four model mineral components in ambient dust. 6:2 diPAP was found to undergo a fast degradation on titanium dioxide (TiO 2 ) particles as well as on artificial mineral dust containing TiO 2 (2.67% in mass) to produce C5–C7 PFCAs and other intermediates. Based on monitored intermediates and further degradation tests on important intermediates, thermodynamic calculation of energy barrier and Gibbs Free Energy was used to explain the observed degradation patterns and accordingly the degradation pathways of diPAPs were proposed. The increase in relative humidity promotes the production of hydroxyl radicals , which enhances the hydrolysis of 6:2 mono- and di-PAPs and the yield of C5 and C7 PFCAs. Oxygen is critical for radical formation, which bypasses the production of fluorotelomer carboxylic acid . Results of this study for the first time demonstrate that diPAP may account for additional PFCA sources in both indoor and outdoor environments and the heterogeneous degradation pathways were different from those of volatile fluorotelomer alcohols.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 28
·35261-35271
·
IF 3.056
Zhao Tian-Xin,Wei Yue-Xin,Wang Jun-Ke,Han Lin-Dong,Sun Mang,Wu Yu-Hao,Shen Lian-Ju,Long Chun-Lan,Wu Sheng-De,Wei Guang-Hui
Di-(2-ethylhexyl) phthalate (DEHP) is a common plasticizer, which is known to be an environmental endocrine-disrupting chemical that can jeopardize the male reproductive system. Prepuberal exposure to DEHP leads to steroidogenesis disorders. However, the specific mechanism remains ambiguous. Therefore, Sprague Dawley (SD) rats underwent prepuberal DEHP exposure at a dose of 500 mg/kg per day through gavage. Additionally, the resulting testicular injury was evaluated to confirm the disturbed steroidogenesis. Changes in testicular histology, significant reduction of serum testosterone ( P < 0.01) and luteinizing hormone ( P < 0.001), and significantly decreased expressions of steroidogenic acute regulatory protein ( P < 0.01) and 3-beta-hydroxysteroid dehydrogenase ( P < 0.05) were found in DEHP-treated rats. DEHP exposure resulted in obvious intestinal damage and oxidative stress imbalance, primarily in the jejunum. Both the activation of the nuclear factor-E2-related factor 2 (Nrf2) signaling pathway and alterations of microbiota profiles were observed in all three gut specimens, but were most notable in the jejunum. We hypothesize that the gut-microbiota-testis axis, which is mediated by the activation of the Nrf2 antioxidant pathway, could be involved in the dysfunction of prepuberal steroidogenesis induced by DEHP.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL DAIRY JOURNAL
·
2022
·
IF 3.572
Yaqi Tu,Lei Guan,Fazheng Ren,Hao Zhang
This study sought to research the antigenicity and functional characteristics of Maillard reaction products (MRPs) arising from the human breast milk oligosaccharide , 2′-fucosyllactose (2′-FL), and β-lactoglobulin (β-LG). The MRPs were prepared at 60 °C, 96 h and 79% relative humidity. During the Maillard reaction, the content of ultraviolet-absorbing and fluorescence compounds, and browning products increased. The free amino groups content decreased by 61.5% during the first 48 h then did not change significantly. The results of sodium dodecylsulphate polyacrylamide gel electrophoresis showed that high molecular mass MRPs were generated and the intrinsic fluorescence spectra suggested a masking effect of 2′-FL. The surface hydrophobicity of β-LG-2′-FL increased and the antigenicity of the MRPs reduced significantly compared with the control β-LG, with the inhibition rate reaching 49.09%. The 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity and ferric reducing/antioxidant power assay revealed significant increases in the antioxidant activity of the MRPs.
研究领域:
食品科学
·
生物化学
·
营养学
✓ 已验证
DOI
高影响因子
ORGANOMETALLICS
·
2020
·
IF 3.804
Shuang Huang,Xi Hong,He-Zhen Cui,Bing Zhan,Zhi-Ming Li,Xiu-Feng Hou
Herein, an unprecedented bimetallic bis-NHC Cp*Ir complex 1 bearing 2-arylbenzo[d]oxazolyl and NHC ligands is reported. A significant increase in activity was observed for N-methylation of amines and reduction of aldehydes with MeOH catalyzed by 1 compared to the monometallic analogues (2–11). Under the optimal conditions, it showed to be highly effective in N-methylation of nitroarenes with MeOH as both C1 and H2 source. Substrates, including aromatic amines, ketones, and nitro compounds with various functional groups, can be well-tolerated. Mechanistic studies and DFT calculation highlight the significance of bimetallic centers cooperativity.
研究领域:
无机化学
·
催化
·
有机金属化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）