JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 27
·47723
·
IF 2.188
Yayun Zheng,Yaofang Hu,Xing Yang,Meng Yuan,Jie Zhang,Yaodong Zhang,Jujie Luo
We synthesized novel polyurethane (PU) membranes from isophorone diisocyanate (IPDI), poly(ethylene glycol) (PEG) with a molecular weight of 2000, aminopropyl-terminated poly(dimethyl siloxane) (PDMS) with a molecular weight of 2000, and 1,4-butanediol (BDO) via a two-step polymerization. The structure of each synthesized membrane was studied through Fourier transform infrared spectroscopy and gel permeation chromatography. The effect of the thermal behavior was determined by differential scanning calorimetry and thermogravimetric analysis. The gas-permeability characteristics of the PU membranes were then tested for a single gas. The results show that the permeability of CO 2 ( P CO2 ) gradually increased with PDMS content. Among these PU membranes, PU-d (PEG/PDMS = 1:1, PEG/PDMS/IPDI/BDO = 1:3:2) showed the best P CO2 (132.6 Barrer) at 25°C and 1 bar pressure. The gas-permeability coefficients of each PU membrane at different operating temperatures were investigated, and the results show that P CO2 reached 302.6 Barrer at 65°C and 1 bar. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47723.
研究领域:
高分子材料科学
·
膜分离技术
·
气体分离
·
功能高分子
·
环境化工
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 8
·1951-1959
·
IF 3.8
Sun Shuo,Chen Changyu,Fu Xingyu,Zhang Yandong,Wu Xinyue,Hao Junkai,Feng Jing,Hu Lei,Yao Wenli,Yan Zhengquan
To conveniently monitor bioactive cysteine (Cys) and Fe 2+ in practice, a kind of poly-β-cyclodextrin strengthen praseodymium oxide (Pr 6 O 11 ) porous oxidase mimic ( p -β-CD@Pr 6 O 11 ) was constructed by virtue of the strong coordination between nano Pr 6 O 11 and poly-β-cyclodextrin substrate. After its microstructure and physicochemical property were characterized in detail, it was noted that porous p -β-CD@Pr 6 O 11 exhibited excellent enzyme-like catalytic activity to accelerate the oxidation of 3,3′,5,5,′-tetramethylbanzidine (TMB) and 2,2′-azinobis (3-ethylbenzo-thiazoline-6-sulfonic acid) ammonium salt (ABTS) with significant color-enhancement effect in the air. Based on the signal amplification, trace Cys could exclusively deteriorate the UV-vis absorbance at 653 nm of p -β-CD@Pr 6 O 11 -TMB and Fe 2+ alter the one at 729 nm of p -β-CD@Pr 6 O 11 -ABTS with visual color changes. Under the optimized conditions, the proposed p -β-CD@Pr 6 O 11 -TMB and p -β-CD@Pr 6 O 11 -ABTS systems were successfully applied for dual-channel monitoring of Cys in Cys capsules and fetal bovine serum and Fe 2+ in agricultural products with quite low detection limits, i.e., 7.8×10 −9 mol·L −1 for Cys and 6.93×10 −8 mol·L −1 (S/N=3) for Fe 2+ , respectively. The synergetic-enhancement detection mechanisms to Cys and Fe 2+ were also proposed. Graphical
研究领域:
分析化学
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材料科学
·
生物化学
·
纳米技术
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环境监测
·
生物传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 68
·期 1
·19-30
·
IF 1.66
Liu Rong,Han Xiangna,Huang Xiao,Li Weidong,Luo Hongjie
Tetraethoxysilane (TEOS) is the most commonly used silicon-based stone consolidant in art conservation. However, it is known that the resulting silica gel phase tends to develop cracks inside the stone as the gel shrinks during aging and drying. Such phenomenon may lead to severe damage to the protected objects. By introducing silica nanoparticles into TEOS, a so-called particle modified consolidant (PMC), may minimize such shrinkage by reducing the volume loss and forming mesoporous structure to weaken the capillary forces. But many previous results show significant color changes on the surface of PMC-treated stones which can not be tolerated in the conservation treatments of cultural heritage. In this work, we designed a three-component composite consolidant which consists of 15 nm silica particles, α,ω-hydroxyl-terminated polydimethylsilane (PDMS-OH) and TEOS. Among the three components, TEOS provides the consolidation function, silica nanoparticles prevent the cracking and increase the salt resistance and PDMS-OH further reduces cracking, decreases the color alteration and increases the resistance to wetting of the stone. Experimental results show that the three components have significant synergistic effect, which makes the material exhibiting best overall performance in terms of cultural heritage protection.
研究领域:
材料科学
·
文物保护
·
无机非金属材料
·
表面与界面化学
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Zhejiang University-SCIENCE A
·
2013
·Vol. 14
·期 7
·514-519
·
IF 0.527
Qin Xue-ying,Wang Jing-lun,Tang Dao-ping,Mai Yong-jin,Zhang Ling-zhi
{3-[2-(2-methoxyethoxy) ethoxy]-propyl} triethoxysilane (TESM2) was synthesized and used as an electrolyte additive to improve the performances of lithium-ion batteries (LIBs). The electrochemical properties of the electrolyte (1 mol/L lithium hexafluorophosphate (LiPF 6 )/ethylene carbonate (EC):diethylene carbonate (DEC):dimethyl carbonate (DMC), 1:1:1) with different contents of TESM2 were characterized by ionic conductivity measurement, galvanostatic charge/discharge test of graphite/Li half cells, and electrochemical impedance spectroscopy. Both the cycling performances and C-rate capabilities of graphite/Li half cells were significantly improved with an optimized content of 15% TESM2 in the electrolyte. The graphite/Li half cell delivered a very high specific capacity of 370 mAh/g at 0.2C rate without any capacity loss for 60 cycles, and retained a capacity of 292 mAh/g at 2C rate. The solid electrolyte interphase (SEI) film on the surface of the graphite anode was investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), indicating that TESM2 was effectively involved in the formation of SEI film on the surface of graphite.
研究领域:
电化学
·
能源材料
·
纳米材料
·
表面科学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·301-310
·
IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
研究领域:
环境化学
·
催化材料
·
废水处理
·
无机非金属材料
·
表面科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5736-5744
·
IF 5.726
Weiyang Jin,Fang Liu,Xiaoliang Guo,Jun Zhang,Lekai Zheng,Yongchuan Hu,Jing Mao,Hui Liu,Yanming Xue,Chengchun Tang
The exploration of high-performance, cost-effective, and stable electrocatalysts for the oxygen evolution reaction (OER) is crucial for future energy storage and conversion technologies. Cobalt-based hydroxides and oxides have been considered as ideal OER electrocatalysts and have been intensively studied; however, their catalytic activity is still unsatisfactory. It is known that the interfacial electron and structure engineering of composite electrocatalysts often results in synergistically enhanced catalytic performance. Herein, a self-supported binary heterogeneous catalyst composed of CoFe LDH/Co0.85Se nanosheet arrays vertically grown on carbon cloth has been reported. The heterostructure electrocatalyst exhibits excellent activity for the OER in alkaline electrolyte, requiring an overpotential of only 241 mV at a current density of 10 mA cm−2 with a small Tafel slope of 48 mV dec−1. These performances are significantly better than those of the bare CoFe LDH and Co0.85Se catalysts. Moreover, the composite electrodes exhibit outstanding durability within 40 h of testing. Our further electrochemical results show that the excellent activities of the heterostructure electrodes should be ascribed to the interfacial coupling effect, increased number of activity sites, accelerated electron transfer, and strong structural stability. This work paves an interesting route for boosting the OER performance of oxide-based electrocatalysts by the regulation of electronic structure through introducing non oxide electrocatalysts for various applications.
研究领域:
材料科学
·
电化学
·
能源转换
·
纳米材料
·
催化化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2017
·
IF 3.752
Zhong Ma,Rui Xiao,Liangyong Chen
The chemical looping combustion (CLC) is an advanced combustion technique that can separate carbon dioxide (CO 2 ) simultaneously. The recyclability and stability of oxygen carriers is very important for the economical efficiency of CLC. The major factor for the deactivation of oxygen carriers is sintering. For most CLC studies, the focus were all on the reactivity of the oxygen carriers, but very few effort was contributed to the sintering properties of the oxygen carriers. This article addressed the characteristic and decay kinetics of surface area for iron oxide in the reduction process of CLC. The results showed that increasing the reaction temperature accelerated the decrease rate of surface area for iron oxide . In addition, with the reduction degree deepening, the grain size of iron oxide increased. Sintering kinetics of surface area decay based on a power law expression model was investigated. The activation energy for surface area decrease of iron oxide in the reduction process was calculated as 89.94 kJ/mol. Sintering and oxygen vacancies creation were the two causes for microstructural variation of iron oxide during the reduction process. Sintering leads to the decrease of surface area for iron oxide, while oxygen vacancies creation results in the porous structure forming.
研究领域:
能源化学
·
材料科学
·
燃烧技术
·
二氧化碳捕集
·
表面动力学
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Ya-Song Lin,Hui-Zi Han,Xiao-Qi He,Xian-Tai Zhou
A highly efficient and selective protocol for the oxidation of alkyl aromatics with tert -butyl hydroperoxide (TBHP) oxidant over platinum meso -tetraphenylporphyrin (Pt( II )TPP) was developed. Various alkyl aromatics were selectively converted to ketones smoothly with yields higher than 90% under the optimized conditions. Kinetic studies revealed that the oxidation was first-order with respect to the substrate, and the activation energy ( E a ) was 50.8 kJ mol −1 . Moreover, a mechanism involving high-valence platinum species and free radicals was proposed.
研究领域:
有机化学
·
催化化学
·
物理化学
✓ 已验证
DOI
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 12
·3871-3890
·
IF 1.915
Liu Chenyu,Wei Haitong,Gao Yanhui,Wang Ning,Yuan Xiaoying,Chi Zhilong,Zhao Guangli,Song Shuguang,Song Jianjun,Jin Xinghui
Metal-organic frameworks (MOFs) have unique properties and stable structures, which have been widely used as templates/precursors to prepare well developed pore structure and high specific surface area materials. In this article, an innovative and facile method of crystal reorganization was designed by using MOFs as sacrificial templates to prepare a layered double hydroxide (LDH) nano-layer sheet structure through a pseudomorphic conversion process under alkaline conditions. The obtained CoMn-LDH and CoFe-LDH catalysts broke the ligand of MOFs and reorganized the structure on the basis of retaining a high specific surface area and a large number of pores, which had higher specific surface area and well developed pore structure compared with LDH catalysts prepared by traditional methods, and thus provide more active sites to activate peroxymonosulfate (PMS). Due to the unique framework structure of MOFs, the MOF-derived CoMn-LDH and CoFe-LDH catalysts could provide more active sites to activate PMS, and achieve a 2,4-dichlorophenol degradation of 99.3% and 99.2% within 20 minutes, respectively. In addition the two LDH catalysts displayed excellent degradation performance for bisphenol A, ciprofloxacin and 2,4-dichlorophenoxyacetic acid (2,4-D). X-ray photoelectron spectroscopy indicated that the valence state transformation of metal elements participated in PMS activation. Electron paramagnetic resonance manifested that sulfate radical ( ) and singlet oxygen ( 1 O 2 ) were the main species for degrading pollutants. In addition, after the three-cycle experiment, the CoMn-LDH and CoFe-LDH catalysts also showed long-term stability with a slight activity decrease in the third cycle. The phytotoxicity assessment determined by the germination of mung beans proved that PMS activation by MOF-derived LDH catalysts can basically eliminate the phytotoxicity of a 2,4-D solution. This research not only developed high-activity LDH catalysts for PMS activation, but also expanded the environmental applications of MOF derivants. LDH derived from MOFs through a pseudomorphic conversion process. LDH showed excellent activity to activate PMS to degrade 2,4-DCP and other pollutants. CoMn-LDH and CoFe-LDH exhibited high stability and reusability. High specific surface area and well developed pore structure of LDH provide more active sites. Phytotoxicity assessment displayed the practical application value of LDH.
研究领域:
环境化学
·
材料科学
·
催化化学
·
环境污染治理
·
纳米材料
·
自由基反应机制
·
可持续环境技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Peng Zhao,Nengjie Feng,Bangjie Tan,Zhuobin Huo,Geng Liu,Hui Wan,Guofeng Guan
The exposed crystal facets are crucial to heterogeneous catalysis . Herein, the facet controlled Ce 1−x La x O δ (0 ≤ x ≤ 0.30) nanocomposites have been constructed elaborately via a hydrothermal route and used for soot abatement. The catalysts were characterized by XRD , TEM, Raman, FT-IR, XPS , H 2 -TPR, and so forth. With the increasing content of La 3+ , part of CeO 2 crystals transformed from nanocubes to nanorods , inducing distinct effects on the catalytic activity . When the concentration of La 3+ was lower than 10 %, the exposed facet in the catalyst was (200). After La 3+ were further introduced, the facet degraded to (111). La 3+ at low concentration would enhance activity by facilitating lattice oxygen delivery and inducing abundant surface oxygen species, especially O - , which were vital to surface sensitive soot oxidation . Nevertheless, excessive La 3+ ions would inhibit CO 2 desorption due to the generation of La 2 O 2 CO 3 , a strong alkali as a result of phase separation. Among all the catalysts, Ce 0.95 La 0.05 O δ showed the best catalytic performances for soot combustion, with T 50 of 375 °C.
研究领域:
材料化学
·
环境催化
·
纳米材料
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Huilin Hou,Minghui Shang,Fengmei Gao,Lin Wang,Qiao Liu,Jinju Zheng,Zuobao Yang,Weiyou Yang
Development of novel hybrid photocatalysts with high efficiency and durability for photocatalytic hydrogen generation is highly desired but still remains a grand challenge currently. In the present work, we reported the exploration of ternary hybrid TiO2/CuO/Cu thoroughly mesoporous nanofibers via a foaming-assisted electrospinning technique. It is found that by adjusting the Cu contents in the solutions, the unitary (TiO2), binary (TiO2/CuO, TiO2/Cu), and ternary (TiO2/CuO/Cu) mesoporous products can be obtained, enabling the growth of TiO2/CuO/Cu ternary hybrids in a tailored manner. The photocatalytic behavior of the as-synthesized products as well as P25 was evaluated in terms of their hydrogen evolution efficiency for the photodecomposition water under Xe lamp irradiation. The results showed that the ternary TiO2/CuO/Cu thoroughly mesoporous nanofibers exhibit a robust stability and the most efficient photocatalytic H2 evolution with the highest release rate of ∼851.3 μmol g–1 h–1, which was profoundly enhanced for more than 3.5 times with respect to those of the pristine TiO2 counterparts and commercial P25, suggesting their promising applications in clean energy production.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光催化
·
清洁能源
·
多孔材料
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Fenglian Fu,Min Hu,Bing Tang,Weijiang Han,Zihang Cheng
Chromium is a contaminant commonly found in water and soil because of its widespread use in various industries. Hexavalent chromium (Cr(VI)) is known to be highly toxic and carcinogenic, and the removal of Cr(VI) has attracted much scientific attention. In this paper, with the aid of polyoxometalate (POM), Cr(VI) removal increased significantly by acid-washed zero-valent iron (ZVI) under acid conditions in air. POM can mediate the electron transfer from ZVI surface to O 2 with enhancing the generation of H 2 O 2 , which is favorable for the removal of Cr(VI). The effects of iron loadings, POM concentrations, and initial pH values on the removal of Cr(VI) in ZVI/POM/air system were investigated and reaction mechanism was studied. Results indicated that POM is an efficient catalyst for Cr(VI) removal by acid-washed ZVI.
研究领域:
环境科学
·
水处理技术
·
污染控制化学
·
环境工程
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）