CHINESE JOURNAL OF CATALYSIS
·
2018
·Vol. 38
·期 12
·2132-2140
·
IF 3.525
Lingfeng Li,Xiaolong Zhao,Donglai Pan,Guisheng Li
Photoactive WO 3 is attractive as a photocatalyst for green energy evolution through water splitting. In the present work, an electrochemical anodic oxidation method was used to fabricate a photo-responsive nanotube array-like WO 3 /W (NA-WO 3 /W) photoanode from W foil as a precursor. Compared with a reference commercial WO 3 /W electrode, the NA-WO 3 /W photoanode exhibited enhanced and stable photoelectrocatalytic (PEC) activity for visible-light-driven water splitting with a typical H 2 /O 2 stoichiometric ratio of 2:1 and quantum efficiency of approximately 5.23% under visible-light irradiation from a light-emitting diode ( λ = 420 nm, 15 mW/cm 2 ). The greatly enhanced PEC performance of the NA-WO 3 /Wphotoanode was attributed to its fast electron–hole separation rate, which resulted from the one-dimensional nanotube array-like structure, high crystallinity of monoclinic WO 3 , and strong interaction between WO 3 and W foil. This work paves the way to a facile route to prepare highly active photoelectrodes for solar light transfer to chemical energy .
研究领域:
材料科学
·
物理化学
·
能源化学
·
纳米科技
·
光催化
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Xiaoyun Chen,Dong-Hau Kuo,Dongfang Lu,Yongxuan Hou,Yen-Rong Kuo
Mesoporous TiO 2 was synthesized by a hydrolysis precipitation method with the utilization of the biological renewable resource of lignin as template and TiCl 4 as reactant. The photocatalytic activity of TiO 2 was investigated by the degradation of phenol under UV light irradiation. The microstructure, crystallinity , powder characteristic, and chemical bonding of the catalyst were analyzed. The 500 °C-calcined TiO 2 had average crystallite size of about 11.1 nm and a mesoporous structure with specific area of 165.8 m 2 /g and pore volume of 0.312 cm 3 /g. The results showed that TiO 2 synthesized with lignin template exhibited high photocatalytic activity, which can be attributed to the electronegativity and the network skeleton of lignin to uniformly distribute the TiO 2 precursor for forming TiO 2 mesoporous particles. The mechanism for the improved photodegradation of the lignin-assisted TiO 2 was proposed.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
光催化
·
绿色化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hao Wu,Tianyi Jiang,Wenlong Wu,Shanguo Zhang,Ming Li,Jingzhuo Zhou,Mengya Zhu,Juzheng Chen,Ziyong Li,Yang Lu,Hongyuan Jiang
Water-in-oil-in-water (W/O/W) double emulsion droplets are a typical colloidal system applied in various practical fields. However, certain high-specification applications necessitate exact geometric homogeneity in terms of both shell diameter and thickness. Despite achieving uniformity in shell diameter, on-chip microfluidic emulsification always leads to an eccentric phenomenon due to innate density differences of the droplet solution. At the same time, the current regulation methods have multiple limitations, including their applicability, regulatory scope, and objective restrictions. Herein, we propose an off-chip osmosis-induced hydrodynamic method to accurately regulate the eccentricity of W/O/W double emulsion droplets. The rational selection of hypertonic osmosis can energize the droplets and induce inward transmembrane water flux. This flow helps to reposition the droplet core to align concentrically with the shell, regardless of the initial dimension and eccentricity of the droplets. As the osmotic induction reduces due to the dilution of the inner solute molar concentration , the optimal droplet configuration can be achieved when osmosis-induced hydrodynamic regulation sufficiently counteracts the adverse effects of droplet solution density difference. The microcapsules can thus be produced by instant UV polymerization of the regulated double emulsion droplets, and the silica microspheres with fine geometric homogeneity can be prepared through further heat treatment, which is expected to meet the stringent morphological requirements in practical applications.
研究领域:
胶体与界面化学
·
微流控技术
·
生物材料
·
药物递送系统
·
高分子科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105785
·
IF 5.909
Jinjia Guo,Yongmei Wang,Zhao Luo,Feng Zhang,Dewang Yang
Carbon cycle in coastal water is a significant dynamic component of global carbon budget , however, the diverse sources, carbon sinks and their complex interactions remained poorly understood. In order to detect the dissolved inorganic carbon (DIC) and their interactions, gas-liquid Raman spectroscopy was built and applied to simultaneously detect the constituents of air, dissolved CO 2 , HCO 3 - and chlorophyll in coastal water. The linear fitting curve between peak intensity and concentration was built for the quantitative analysis of HCO 3 - and CO 2 , meanwhile, the fluorescence peaks of chlorophyll at 679 nm were detected for the qualitative analysis. For the multi-components analysis, typical Raman spectra of the constituents of air, dissolved CO 2 , HCO 3 - in seawater, and the fluorescence spectra of chlorophyll in seawater were detected. Results showed that the time dependent change of CO 2 and O 2 in the air exhibited a contrary tendency, while that of dissolved CO 2 and O 2 was curved like a cosine. The changing tendency of relative concentrations of dissolved CO 2 was about 2 h earlier than CO 2 in air, due to the life activity of microorganisms driving the gas exchange at the air-sea interface. Furthermore, the study makes a study on the relationship between DIC and chlorophyll based on the detection of HCO 3 - and chlorophyll in coastal water, indicating that this gas-liquid Raman spectroscopy could successfully provide real-time analysis of multicomponent DIC in the air-sea exchanging process.
研究领域:
海洋化学
·
环境光谱学
·
碳循环
·
分析化学
·
生物地球化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 7
·3985-3994
·
IF 11.301
Ruidi Wang,Bei-Bei Xu,Jiachen Wang,Xue Lu Wang,Ye-Feng Yao
The relationship between the structural characteristics and photocatalytic reaction mechanisms of graphitic carbon nitride (g-C3N4) still remains unclarified at the molecular level, which severely hinders the further development of this field. The present study addresses this issue by employing an innovative strategy to investigate the relationship between the H-containing structures of g-C3N4 and its water splitting properties. The exchangeable and unexchangeable protons of the H-containing groups of g-C3N4 were differentiated by selective deuteration, providing a way to distinguish the hydrophilic and relatively non-hydrophilic H-containing groups of g-C3N4. A combination of advanced solid-state NMR approaches reveals that amino group defects (CN2(NHx)) on the C–N skeleton of the photocatalyst likely serve as hydrophilic active sites for facilitating the photocatalytic hydrogen evolution reaction. Accordingly, the newly synthesized g-C3N4 sample having a high concentration of CN2(NHx) by design demonstrates an enhanced H2 yield by a factor of 17 compared to that of pure g-C3N4.
研究领域:
材料化学
·
光催化
·
固体核磁共振
·
表面科学
·
能源材料
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Xiaoyan Liu,Guojun Lan,Panpan Su,Lihua Qian,Tomas Ramirez Reina,Liang Wang,Ying Li,Jian Liu
The hydrogenation of levulinic acid to γ-valerolactone with water as solvent is a crucial reaction for producing fine chemicals. However, the development of highly stable catalysts is still a major challenge. Here, we prepared a Ru nanoparticles incorporated in mesoporous-carbon (Ru-MC) catalyst to achieve high stability in acidic aqueous medium. The Ru-MC showed excellent catalytic performance (12024 h −1 turnover frequency) in the hydrogenation of LA-to-GVL. Compared with Ru supported on mesoporous carbon catalyst (Ru/MC) prepared by conventional wet impregnation method, the Ru-MC showed excellent reusability (more than 6 times) and thermal stability (up to 600 °C). Based on H 2 -TPR-MS characterization, it was proposed that the incorporated structure significantly increased the interaction between Ru nanoparticles and carbon support, which effectively prevent the leaching and sintering of Ru nanoparticles and contributed to increased high reusability and thermal stability of the Ru-MC.
研究领域:
催化化学
·
绿色化学
·
生物质转化
·
纳米材料
·
能源化学
·
有机合成
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2019
·
IF 1.398
Junsheng Li,Bixuan Wang,Junfu Fan,Xin Zhong,Guoxia Huang,Liujuan Yan,Xiane Ren
In this study, the effects of the disulfide bond cleavage induced by peracetic acid oxidation on the surface properties and surface hydrophobicity of soy proteins isolate (SPI) were investigated. The surface hydrophobicity, foaming capacity and emulsifying capacity of oxidized-SPI increased gradually at the initial stage with the increase of peracetic acid concentration. When the concentration of peracetic acid was increased up to 0.4%, compared with that of native SPI, the surface hydrophobicity, foaming capacity, emulsifying capacity and emulsifying stability of oxidized-SPI increased by 114.0, 81.4, 65.2, 49.8%, respectively, and achieved optimal results. However, excessive oxidation led to a decrease in surface hydrophobicity, foaming capacity and emulsifying stability of SPI, but it had no obvious effect on the foaming stability and emulsifying capacity of SPI. The foaming capacity, emulsifying capacity and emulsifying stability of SPI were positively related to the changes of surface hydrophobicity which caused by disulfide bond cleavage. The results of fluorescence spectroscopy, CD spectroscopy, and particle size analysis showed that the disulfide bond cleavage did cause great changes in the molecular structure of SPI, but there was no clear correlation between the molecular structural change and the surface activity of SPI. These suggested that the improvement of foaming capacity, emulsifying capacity and emulsifying stability of SPI could be achieved by changing its surface hydrophobicity via peracetic acid oxidation.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2021
·Vol. 14
·期 10
·103351
·
IF 5.165
Deqiang Wang,Xin Zhou,Chong Ma,Meiying Liu,Hongye Huang,Xiaoyong Zhang,Yen Wei
Fluorescent sensor has demonstrated to be a facile and effective method to detect heavy metal ions owing to its unique characteristics such as simplicity, ease of operation and cost-effectiveness. In this work, a novel fluorescent probe with aggregation-induced emission (AIE) feature that contains an amide ligand base on the tetraphenylethylene (TPE) dye was designed and successfully synthesized. The utilization of the AIE-active fluorescent probe (named as FDPA) for detection of Cu 2+ in aqueous solution has also been examined. We demonstrated that the resultant AIE-active molecule displays amphiphilic property and can self-assemble in aqueous solution with remarkable enhancement of fluorescent intensity owing to its AIE feature. The detection limit of probe for Cu 2+ determination is 6.11 × 10 −9 M and shows excellent selectivity in the presence of competitive ions. This work provides a useful route to overcome the fluorescence quenching of conventional fluorescent probes in aqueous solution and an elegant way to prepare fluorescent probes with better fluorescence properties.
研究领域:
分析化学
·
生物医学工程
·
分子影像
·
环境毒理学
·
化学生物学
·
药物分析
·
纳米医学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Shan Liu,Maochao Wei,Xiangli Zheng,Shuai Xu,Changli Zhou
We are just beginning to exploit the fascinating potential of thionine , called electrochemical probe that can selectively recognize specific polycyclic aromatic hydrocarbons (PAHs), as tools for the detection of tricyclic aromatic hydrocarbons phenanthrene (PHE) and anthracene (ANT). A novel electrochemical sensing platform by modification of electroactive thionine functionalized graphene onto glass carbon electrode (Th/GRs/GCE) surface was constructed. The immobilized thionine showed a remarkable stability, which may benefit from the π–π stacking force with graphene. Under optimum conditions, the proposed electrochemical sensor exhibited high sensitivity and low detection limit for detecting PHE and ANT. The total amount of PHE and ANT could be quantified in a wide range of 10 pM–0.1 μM with a good linearity ( R 2 = 0.9979) and a low detection limit of 0.1 pM ( S / N = 3). Compounds which possess one or two benzene rings or PAHs with more than three rings, such as benzene, naphthalene (NAP), benzo[a]pyrene (BaP) and pyrene (PYR) show little interference on the detection. Consequently, a simple and sensitive electrochemical method was proposed for the determination of PHE and ANT, which was used to determine PHE and ANT in waste water samples. The electrochemical method provides a general tool that complements the commonly used spectroscopic methods and immune method for the detection of PAHs.
研究领域:
分析化学
·
环境监测
·
电化学传感器
·
分子识别
·
污染物检测
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zilu Li,Kefei Zhao,Yue Wang,Zirui Zheng,Chenhui Zhang,Yuxia Gao,Fengpei Du
Impact and spread of droplet on superhydrophobic surface are ubiquitous in inkjet printing , pesticide spraying, paint coating, and other fields. However, due to the extremely water-repellent properties of superhydrophobic surface, droplets frequently splash or roll off, causing great waste and serious environmental problems. Thus, searching for an effective strategy to regulate the droplet splash and spread on superhydrophobic surfaces is of remarkable significance. To address the above issues, herein, we demonstrate the controllable regulation on superhydrophobic lotus leaf surface by tuning the double-chain length of surfactants . The outcomes indicate different regularities for droplet splash in a short time (~10 ms) and spread in a relatively long period (~100 s). It can be concluded that dynamic surface tension of surfactant, diffusion rate of surfactant from the bulk to the interface, and assembly disaggregation rate dominate the impact process, whereas the adsorption kinetic and effectiveness of surfactant along with the spreading driving force determine the wetting transition. Surfactant owning suitable hydrophilic and hydrophobic ratio, fast diffusion rate, and unstable assembly could inhibit droplet splash and improve spreading pronouncedly, thereby enhancing the droplet deposition on superhydrophobic surfaces. This study makes original contribution to screen suitable surfactants from the structural aspects, especially double-chain length, which has not been treated in much detail to date. Our work not only creates a big impetus in illuminating the mechanism of surfactant molecular structure on droplet deposition processes but also greatly expands the applications of surfactant in many fields.
研究领域:
胶体与界面化学
·
农业化学
·
材料科学
·
流体力学
·
环境科学
·
应用物理
·
纳米科技
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 12
·9868-9880
·
IF 1.5
Hongying Li,Xueliang Wang,Tao Wang,Zhaoxia Wang,Wei Zhao
A modified electrode was fabricated by casting graphene oxide (GO) suspension onto the surface of active glassy carbon electrode (GCE), and it can significantly enhanced the oxidation peak currents of m-trihydroxybenzene (m-THB) and p-nitrophenol (p-NP). Based on this, a sensitive analytical method towards their simultaneous determination was established. Many influencing factors such as the type of electrolyte, acidity, scan rates and concentrations were explored. Under the optimal experimental conditions, the oxidation peak currents of m-THB and p-NP were linearly increased with their concentrations ranging from 9 to 100 μM, with the detection limits both of 1 μM. Comparing with other reported methods, this sensor showed wider linear range and lower detection limit. In addition, the proposed method was successfully used to analysis of real environmental water samples with satisfactory recoveries, which verified the practicability of the sensor.
研究领域:
分析化学
·
环境科学
·
电化学
·
传感器技术
·
污染物检测
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2017
·
IF 2.048
Zhangyi Huang,Zhangkai Cao,Ke Shi,Jianqi Qi,Mao Zhou,Zhe Tang,Wei Han,Xinyue Diao,Jun Tang,Tiecheng Lu
For Gd 2 Zr 2 O 7 , nanograin ceramics with high relative densities (95%–97.4%) and small average grain sizes (61 nm - 82 nm) were successfully fabricated for the first time using field assisted sintering technique (FAST), also known as spark plasma sintering (SPS) method, in which nanopowders with an average crystallite size of 5.9 nm were synthesized via a non-aqueous gel-combustion method. Temperature was varied over a broad range to investigate its influence on the densification mechanism, microstructure evolution and hardness. The results revealed that both relative density and grain size increase with the increase of sintering temperature . The densification processes were divided to three stages. 1250 °C–1300 °C is the most suitable temperature range to fabricate dense Gd 2 Zr 2 O 7 nanograin ceramics with comparatively high hardness by FAST.
研究领域:
材料科学
·
无机非金属材料
·
陶瓷工程
·
纳米材料
·
固态化学
·
烧结工艺
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）