SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yi Hong Huang,Jian Hua Chen,Xue Sun,Zhen Bo Su,Hai Tao Xing,Shi Rong Hu,Wen Weng,Hong Xu Guo,Wen Bing Wu,Ya San He
Facile and stable nanocomposites, carbon nanocages (CNCs)-reduced graphene oxide (RGO), were developed via one-pot in situ solvothermal reaction in this study. Transmission electron microscope, scanning electron microscope, X-ray diffraction, Raman spectroscopy, energy dispersive X-ray spectroscopy, atomic focus microscope, N 2 adsorption/desorption isotherms, thermogravimetric analysis and Fourier-transform infrared were performed to characterize the CNCs-RGO hybrid material. The electrochemical detections of catechol (CC) and hydroquinone (HQ) were investigated by means of cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The excellent electrocatalytic activity and reversibility have been shown on the modified electrode toward oxidation of both CC and HQ in 0.04 M acetate buffer solution (pH = 4.0). The relationship between the oxidation peak current of CC and its concentration was linear over the range from 1 to 400 μM in the presence of 100 μM HQ, and the linear relationship between the oxidation peak current of HQ and its concentration can be obtained range from 1 to 300 μM in the presence of 100 μM CC. The detection limits (S/N = 3) for CC and HQ were 0.40 and 0.87 μM, respectively.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 24
·3380-3389
·
IF 4.76
Ming Zhang,Wenqin Lai,Lili Su,Yu Lin,Guozhang Wu
Isosorbide polycarbonate (ISB-PC) was prepared by melt transesterification and polycondensation reaction by employing ISB and diphenyl carbonate (DPC) as monomers. The effects of catalyst on the reactivity and the reactivity disparity of two hydroxyl groups (endo-OH and exo-OH) on ISB were investigated. The result shows that a metal chloride can form intermolecular hydrogen bonding with ISB hydroxyl groups, and the ISB intramolecular hydrogen bonding facilitates a stronger intermolecular hydrogen bonding between endo-OH and the catalyst. The intermolecular hydrogen bonding is capable of improving preferentially the endo-OH reactivity and thus increases the content of the endo–endo (a1) structure on the ISB-PC chain, resulting in a high Tg of the product. Further balancing of the reactivity disparity between endo-OH and exo-OH can be achieved by adjusting log β1 of the alkali metal chloride. It is found that the lithium chloride (LiCl) catalyst can significantly reduce the reactivity disparity, and the viscosity-average molecular weight of the synthesized ISB-PC reaches 51 000 g mol−1.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2013
·
IF 4.75
Dong-Zhi Chen,Jun-Yi Fang,Qian Shao,Jie-Xu Ye,Du-Juan Ouyang,Jian-Meng Chen
A novel entrapment matrix, calcium alginate (CA) coupled with activated carbon fiber (ACF), was prepared to immobilize Pseudomonas oleovorans DT4 for degrading tetrahydrofuran (THF). The addition of 1.5% ACF increased the adsorption capacity of the immobilized bead, thus resulting in an enhanced average removal rate of 30.3 mg/(L h). The synergism between adsorption and biodegradation was observed in the hybrid CA–ACF beads instead of in the system comprising CA beads and freely suspended ACF. The effective diffusion coefficient of the CA–ACF bead was not significantly affected by bead size, but the bead’s value of 1.14 × 10 −6 cm 2 /s (for the bead diameter of 0.4 cm) was larger than that of the CA bead by almost one order of magnitude based on the intraparticle diffusion–reaction kinetics analysis. Continuous treatment of the THF-containing wastewater was succeeded by CA–ACF immobilized cells in a packed-bed reactor for 54 d with a >90% removal efficiency.
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Heyu Li,Zhe Sun,Shaochen Shang,Yan Cao
The development of cost-effective and reactive oxygen carriers and the fast and complete conversion of solid fuels are two critical issues in the solid fuel chemical looping technology. Red mud, a solid waste from the alumina industry, was found to be an economic oxygen carrier candidate simultaneously realizing the use of solid wastes and the CO 2 abatement after comparing with other two different iron-based materials (pure Fe 2 O 3 and hematite). This study validated red mud as an excellent oxygen carrier to achieve the almost complete conversion of char in solid fuels (SFs) (99.4%) and meanwhile the hydrogen production with high-purity (97% H 2 purity) and higher H 2 yield (around 500 mL/g), in the optimized pyrolysis procedure of solid fuels with proper gasification agent and rationalized reaction temperatures (1000 °C) and residence time (10mins). Characterizations of red mud using SEM-EDS and XRD revealed that the unique microscopic crystalline structures of both Fe 2 O 3 and Ca 2 Al 2 SiO 7 particles nested on Na 4 Al 2 Si 2 O 9 molten substrate, implying that the existence of Na-containing component of the red mud OC likely accounts for its higher reactivity and stability in multiple redox cycles.
研究领域:
能源科学
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Jun Hu,Shenghua Zhang,Rui Xiao,Xiaoxiang Jiang,Yunjun Wang,Yahui Sun,Ping Lu
Using isopropanol as an in situ hydrogen donor, catalytic transfer hydrogenolysis of lignin into monomeric phenols was studied at mild conditions. The performance of catalysts and the effects of H 2 , temperature, and time on depolymerization of acid extracted birch lignin (ABL) were extensively examined. Platinum-rhenium supported on titanium dioxide (PtRe/TiO 2 ) exhibited much higher activity on disrupting C O bonds than Pd/C, HZSM-5, Pt/TiO 2 , and Re/TiO 2 . 18.71 wt% monophenols was achieved for depolymerization of ABL over PtRe/TiO 2 at 240 °C for 12 h with He. 4-Propylsyringol had the highest yield of 7.48 wt%. 2D HSQC NMR analysis reveals that β-O-4 bonds have been fully disrupted during depolymerization. Addition of H 2 led to less monophenols, likely due to the competitive adsorption of active sites on catalysts. Structure-reactivity analysis based on six representative lignins shows that the total yields of monophenols were highly linearly correlated with the β-O-4 contents (R 2 = 0.97).
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Yihan Zhang,Jing Shi,Zhengwen Xu,Yue Chen,Duanmei Song
Schorl could perform as an extremely promising catalyst for decomposing tetracycline hydrochloride (TC) due to its high degradation efficiency, low cost, chemical stability, easy recovery and repeatable utilization. Comparisons of TC degradation indifferent systems showed that schorl/H 2 O 2 system exhibited the optimum pollutant elimination and TOC removal efficiencies. Kinetics and possible mechanisms of TC degradation were clarified. The OH generated on the schorl surface and O 2 − /HO 2 were the main reactive species responsible for TC oxidation. Six possible intermediates were identified, and possible transform mechanisms and pathways were explored. Active radicals were inclined to attack the C C double bond, dimethylamino and phenolic moieties of TC molecular. The principal intermediate products were generated through N-demethylation, oxidation and rearrangement.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2012
·Vol. 23
·期 2
·198-203
·
IF 10.179
Tianru Wu,Guqiao Ding,Honglie Shen,Haomin Wang,Lei Sun,Da Jiang,Xiaoming Xie,Mianheng Jiang
A simple but efficient strategy to synthesize millimeter-sized graphene single crystal grains by regulating the supply of reactants in the chemical vapor deposition (CVD) process is demonstrated. Polystyrene is used as a carbon source. Pulse heating on the carbon source is utilized to minimize the nucleation density of graphene on copper foil, while a gradual increase in the temperature of the carbon source and the flow rate of hydrogen is adapted to drive the continuous growth of the graphene grains. As a result, the nucleation density of graphene grain can be controlled to as low as ≈100 nuclei/cm 2 , and a single crystal grain can grow up to dimensions of ≈1.2 mm. Raman spectroscopy, transmission electron microscopy (TEM), and electrical-transport measurements show that the graphene grains obtained are of high quality. The strategy presented provides very good controllability and enables the possibility of large graphene single crystals, which is of vital importance for practical applications.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2020
·
IF 0
Min-Hao Zhang,Cheng-Hui Li,Jing-Lin Zuo
Supramolecular polymers are intriguing due to their thermal reversible and stimuli-responsive properties. However, most supramolecular polymers reported thus far have poor mechanical properties due to the low bonding energy of the non-covalent interactions. Here, we report a supramolecular polymer that is formed by small molecules, ethylene glycol- bis (2-aminoethylether)- N,N,N ′ ,N ′-tetrapropionic acid (EGTPA). Owing to the dense hydrogen bonding and low crystallinity, this material exhibits polymer-like properties—in other words, high mechanical strength and excellent plasticity. Thermal and environmental control over the dynamics of hydrogen bonding leads to many intriguing properties, such as thermal healing and tunable mechanical strength, in a way that is not accessible by traditional polymers. Based on these features, we further demonstrate its application in shape memory hybrids. Significant shape memory effect is observed, although neither of the components of the hybrids show the shape memory effect individually.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
Materials Today Chemistry
·
2021
·
IF 8.301
Y. Ji,W. Luo,Y. Liu,Z. He,N. Cheng,Z. Zhang,X. Qi,J. Zhong,L. Ren
The bottleneck of alkaline hydrogen evolution reaction lies in the kinetically sluggish brought from multistep reaction processes involving water adsorption and dissociation, as well as hydrogen adsorption. In this work, we successfully synthesized o-CoSe 2 /c-CoSe 2 heterostructures anchored on MoSe 2 nanosheets to powerfully promote reaction processes. As an electrocatalyst , it exhibits a low overpotential of 112 mV at 10 mA/cm 2 and a Tafel slope of 96.9 mV/dec for an alkaline hydrogen evolution reaction . Moreover, the as-prepared catalyst can behave as both cathode and anode for overall water splitting , which only requires 1.61 V cell voltage at 10 mA/cm 2 . Significantly, the cell voltage can be further reduced to 1.53 V at 10 mA/cm 2 for water electrolysis under the simulated solar irradiation owing to such a semiconductor-based heterostructure that facilitates the separation of photogenerated charges. Here, the improving overall performance of this ternary electrocatalyst is attributed to the multifunctionality and synergistic interaction of different components in this heterogeneous material . The work provides a novel strategy to design active catalysts simultaneously using electric energy and solar energy for effective water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zeqi Jin,Lan Wang,Tao Chen,Junmei Liang,Qicheng Zhang,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Designing hydrogen evolution reaction catalysts with high performance in alkaline conditions is important for reducing energy consumption during water electrolysis. This study reports an electrodeposition–calcination–electrodeposition strategy to construct the Ni–Mo–O/Ni4Mo nanointerface on an N-doped carbon support derived from polyaniline on carbon fiber paper. The N-doped carbon support not only stabilizes the metal/metal oxide nanointerface but also generates more active intrinsic sites and electrical conductivity via the metal–N interaction. The obtained Ni–Mo–O/Ni4Mo@NC displays a low overpotential of only 61 mV at a current density of 10 mA cm–2 for alkaline HER in 1 M KOH.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
·
2020
·Vol. 53
·期 1
·154-163
·
IF 1.531
Yuyang Li,Jiabiao Zou,Wenhao Yuan,Chuangchuang Cao,Yan Zhang,Fei Qi,Jiuzhong Yang
This work reports an investigation on laminar premixed flames of tetralin at 30 Torr and equivalence ratios of 0.7 and 1.7. Measurements of the chemical structure including identification and mole fraction measurements of free radicals, isomers, and polycyclic aromatic hydrocarbons (PAHs) were performed using synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). A kinetic model with 296 species and 1 577 reactions was developed and validated against the flame chemical structure data measured in this work. Modeling analysis reveals the key reaction pathways in tetralin decomposition and PAHs formation. The H-atom abstraction reactions by H, O, and OH are found to control the consumption of tetralin in the lean flame, while those by H play the dominant role in the rich flame. Indene and naphthalene have very high concentration levels in the rich tetralin flame due to the existence of direct formation pathways from the decomposition of tetralin. The two bicyclic PAHs and their radicals play significant roles in the PAHs growth process of tetralin combustion, which results in the high sooting tendency of tetralin compared to those of alkylbenzenes with smaller or same carbon atom numbers.
研究领域:
化学动力学
·
燃烧科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhengting Zhang,Guiyun Yi,Peng Li,Xikui Wang,Xiaodong Wang,Chuanxiang Zhang,Yulong Zhang,Qi Sun
Herein, a novel europium/graphene oxide/lead oxide (Eu/GO/PbO 2 ) composite based anode with excellent electrocatalytic performance towards degradation of hydroquinone was prepared by a facile co-electrodeposition method. The composition and micromorphology of the anode was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and the results confirmed that europium (Eu) and graphene oxide (GO) were successfully composited with PbO 2 and a more compact structure was obtained, which was conductive to enhancing the corrosion resistance of the electrode. Besides, electrochemical measurements indicated that Eu/GO/PbO 2 electrode possessed longer service lifetime (87 h), higher oxygen evolution potential (2.64 V), and lower charge transfer resistance (41.08 Ω) than GO/PbO 2 and pure PbO 2 electrode. The promoted electrocatalytic activity of Eu/GO/PbO 2 electrode was ascribed to its stronger hydroxyl radical generation ability, more active sites and lower electron transfer resistance. Additionally, effects of initial hydroquinone concentration, applied current density and initial pH value on the degradation performance of Eu/GO/PbO 2 anode were systematically investigated. The behind degradation mechanism of hydroquinone by Eu/GO/PbO 2 anode was speculated on the basis of the major intermediates identified by high performance liquid chromatography-mass spectrometer (HPLC-MS). Under the continuous attack of free hydroxyl radicals, hydroquinone was finally decontaminated into CO 2 and H 2 O. The present work demonstrated that Eu/GO/PbO 2 composite anode exhibited excellent degradation performance towards hydroquinone.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）