APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Xiaoyuan Liu,Yu Zou,Jiang Jiang
Photocatalytic valorization is a sustainable approach for converting glycerol to value-added chemicals under ambient conditions, which remains challenging. Herein, using Au/TiO 2 as photocatalyst, we report glycerol oxidation reaction in non-pressurized reactor with borate additives. The activity and selectivity of photocatalytic glycerol oxidation depends on Au loading, borate concentration and solution pH. Both superoxide and hydroxyl radicals are generated due to oxygen reduction and water oxidation by photoexcited charge carriers. Apart from coordinating and protecting the oxidized intermediates from further oxidation, borate additives are discovered to up-regulate the superoxide radical generation, beneficial for C3 products formation. In pH 12 solution, C3 products selectivity of 58% and 37% on liquid-phase and carbon basis respectively, was realized at 94% glycerol conversion under AM 1.5 G irradiation for 4 h. Our finding may help guiding future catalyst design for photocatalytic biomass valorizations, where a balanced oxidative power is needed to steer the reaction pathway.
研究领域:
化学工程
·
可再生资源转化
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Dan Liu,Ismail Nadia,Chaohe Fang,Kuan He,Binghui Ge,Hailong Chen,Zhuo Chen
Hydrogenation of nitroaromatics to the corresponding amines plays a central role in the drug, fine chemical, and petrochemical industry. However, realizing hydrogenation through highly effective and environment-friendly methods remains a significant challenge. Here we demonstrated photo-enhanced catalytic activity for hydrogenation of nitrobenzene using Pt-Au/TiO 2 heterojunction as catalyst and hydrogen as reducing agent. The catalytic reaction rate improved 6.5 times under the simulated sunlight compared to the counterpart without light irradiation, and the TOF value of the catalytic reaction achieved as high as 7315 h −1 under light irradiation, better than the previously reported results. Further mechanism investigations indicate that light illumination can promote the activation of hydrogen and nitrobenzene molecules so that the catalytic performance improves significantly. This finding not only develops a green approach for the hydrogenation of nitroaromatics but also opens an avenue for designing high-efficiency photocatalysts.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Ting Qu,Xue Hu,Ying Ou,Jie Wang,Fuqiang Hu,Jing Ni,Fan Cheng,Chunli Gong,Hai Liu
Robust metallic doped semiconducting networks of precise organization, over large scales and small dimensionality, hold great application potential in the basis of photocatalytic materials. Herein, a facile method to fabricate robust Au@TiO2 hierarchical nanoporous network films is reported, which is templated by thermally stable poly(4-vinylpyridine)-block-poly{11-[4-(4-butylphenylazo)phenoxy]undecyl methacrylate} (P4VP-b-PMA(11C)Az) liquid crystalline (LC) block copolymers (BCPs). A P4VP100-b-PMA(11C)Az15 thin film can self-assemble to form ∼50 nm orderly packed PMA(11C)Az periodic spheres in the P4VP matrix via a solvent-annealing process. When these spherical P4VP100-b-PMA(11C)Az15 films with different thicknesses were exposed to the sol–gel titania precursors alcohol solutions with titanium(IV) isopropoxide (TIPT) and titanium tetrachloride (TiCl4; mass ratio, 3:1), titania was well-formed in the P4VP phase during the calcination process. After a further deposition–precipitation (DP) process, ∼10 nm Au nanoparticles were homogeneously doped in robust TiO2 nanoporous network films. The photocatalytic performance of the obtained robust Au@TiO2 films was studied in detail. It displays significantly enhanced visible light photocatalytic activity. The enhancement mechanism was ascribed to the injection of hot electrons of photoexcited Au nanoparticles to robust porous TiO2 films, which was confirmed by 420 nm Xe laser-induced fast photodegradation of rhodamine B.
研究领域:
材料科学
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化学工程
·
纳米技术
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产品关联
DOI
高影响因子
Science China-Chemistry
·
2023
·Vol. 66
·期 6
·1722-1730
·
IF 9.6
Xiao Ruixue,Zhang Jie,Jiang Tingting,Zhou Yefan,Wang Yun,Xu Wenjia,Feng Yuhua
Precise structural control had attracted tremendous interest in nanosynthesis due to its great importance in tailoring the physical properties of nanomaterials. Here we report the synthesis of highly ordered CdS-Au-TiO 2 ternary Janus structure via template-protected sequential growth and conversion method. Arising from the integration of the rectification effect of Au-CdS and Au-TiO 2 Schottky barriers, the Janus configuration of the CdS-TiO 2 domains, the plasmonic effect of Au nanosphere, and the Z -scheme charge transportation, the CdS-Au-TiO 2 Janus structure showed high efficiency in the model photocatalytic degradation of methyl orange (MO) dye. Importantly, the well-defined structural order allowed the identification of the correlation between the structure and the catalytic performance. We believe that the synthetic control and the mechanism insights would help the design and synthesis of sophisticated nanostructures, and would eventually promote their applications in photocatalysis fields.
研究领域:
材料科学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shuo Zhang,Jun Liu,Chao Shang,Mingzhen Hu,Hexin Zhou,Xuemin Hu,Wenxiu Yang,Erhong Duan,Zhuozhi Wang,Jie Xu,Shuo Wang
Transfer hydrogenation of unsaturated nitro compounds by NH 3 BH 3 is an important hydrogenation reaction. Among them, Au/TiO 2 catalysts could achieve good activity for this reaction, but often have problem such as the selectivity decline. In this study, we prepare PVA-wrapped Au nanoparticles, and then load them onto TiO 2 support to obtain Au/TiO 2 catalyst. We demonstrate that the prepared catalyst after calcination has achieved high activity (>99 %) and high selectivity (99 %) in the transfer hydrogenation of 4-nitrostyrene (4-NS) within 30 min by NH 3 BH 3 under ambient temperature and pressure. In addition, the catalyst can still maintain high selectivity (>97 %) after being recycled for 5 times, showing its remarkable stability and reusability. Characterization results and density functional theory (DFT) calculations showed that the presence of Au-OH species accelerates the dehydrogenation of NH 3 BH 3 and thus enhances the catalytic activity. Meanwhile, Au-OH species and low-coordinated Au are beneficial to enhance nitro adsorption and improve the selectivity of transfer hydrogenation reaction. This study provides new ideas for the rational design of high-performance green gold catalytic transfer hydrogenation reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Lijia Wang,Wenhong Gu,Pengtao Sheng,Zhiwei Zhang,Bing Zhang,Qingyun Cai
CdS/CuInS 2 /Au/TiO 2 nanotube arrays (NTAs) were fabricated by deposition and dipping technique as well as successive ionic layer adsorption and reaction method, where Au nanoparticles were used to improve the interfacial electron transfer and quantum dots (QDs) of CdS and CuInS 2 (4.1 nm) to stimulate the formation of an ideal stepwise band edge structure with TiO 2 . High and stable photocurrent responses were observed on the NTA electrode. A photoelectrochemical aptasensor toward cytochrome c (cyt c) was then fabricated by immobilization of HS-aptamer on the NTAs via Cd-S bond and Cu-S bond. Sensitive and selective detection of cyt c was achieved with a detection range of 5 pM to 100 nM.
研究领域:
生物化学
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分析化学
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 9
·095603
·
IF 3.573
Jingjie Cui,Jing Chen,Shaowei Chen,Li Gao,Ping Xu,Hong Li
Cancer is a cell dysfunction disease. The detection of cancer cells is extremely important for early diagnosis and clinical treatments. At present, the pretreatment for the detection of cancer cells is costly, complicated and time-consuming. As different species of the analytes may give rise to specific voltammetric signals at distinctly different potentials, simple potential sensing has the specificity to detect different cellular species. By taking advantage of the different electrochemical characteristics of normal cells, cancer cells and biointeractions between anticancer drugs and cancer cells, we develop a specific, sensitive, direct, cost-effective and rapid method for the detection of cancer cells by electrochemical potential sensing based on Au/TiO2 nanobelt heterostructure electrodes that will be of significance in early cancer diagnosis, in vitro screening of anticancer drugs and molecular biology research.
研究领域:
生物医学工程
·
分子生物学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wenqing Yu,Ying Wang,Hanwen Zhang,Qiao Zhang,Shengyang Wang,Zhiting Liu,Guangxing Yang,Feng Peng
The 5-hydroxymethylfurfural oxidation reaction (HMFOR) is regarded as a promising approach to produce biomass-derived highly valuable chemical products. 5-Hydroxymethyl-2-furancarboxylic acid (HMFCA) as a typical product via selective oxidation of the aldehyde group in HMF was obtained on Au/anatase and Au/rutile catalysts under photoexcited and dark states. The results show that the HMF oxidation reactivities of Au/rutile and Au/anatase were improved under visible light irradiation compared with those under dark conditions, and the increase of the activity is more obvious as the reaction temperature decreases. The kinetic studies showed that visible light irradiation reduced the energy barrier of the HMF oxidation reaction and promoted the reaction activities. The radical capture and EPR experiments were further used to explore the mechanisms of the HMF oxidation reaction under both conditions over Au/TiO2 catalysts. The evidence indicated that the main active species were 1O2 and trace amounts of •O2– under dark conditions, while the main active species were •O2–, 1O2, and h+ under visible light irradiation conditions for both Au/rutile and Au/anatase catalysts.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Weilin Zhong,Chao Wang,Bo Jiang,Suqing Peng,Hailun Zhao,Riyang Shu,Zhipeng Tian,Yanping Du,Ying Chen
Combining solar energy utilization and hydrogen production is an ideal model for renewable energy development. Especially the conversion of broad-spectrum solar energy into chemical energy of hydrogen and thermal energy can enrich solar energy storage methods. Herein, novel multifunctional Au/TiO 2 @n-octadecane microcapsules with core-shell structure were design and synthesized by wet chemical reduction and electrostatic adsorption self-assembly methods for photothermal hydrogen production and thermal storage . The results showed that microencapsulation of photothermal catalysts could provide an effective reaction area and excellent dispersion stability , where hydrogen production and light to hydrogen efficiency were increased in the 43% and 0.3% respectively, compared to the nanoparticle suspension system. Based on the recorded temperature variations caused by the photothermal effect, the calculated photothermal conversion efficiency and specific absorption rate of Au/TiO 2 @n-octadecane was 25.01% and 277% higher than that of Au/TiO 2 suspension. The proposed hydrogen production and thermal storage method via multifunctional microcapsules might shed some light on the study of improving full-spectrum energy conversion efficiency of solar energy.
研究领域:
材料科学
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能源科学
·
纳米技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiange Peng,Gengping Wan,Lihong Wu,Min Zeng,Shiwei Lin,Guizhen Wang
The exploitation of multifunctional nanomaterials used for colorimetric biosensing assays is highly desired in diagnostic applications. In this paper, a novel TiO 2 -encapsulated Au ( [email protected] 2 ) yolk-shell nanostructure was synthesized via a simple and controllable method, in which the TiO 2 nanotubes could effectively restrain the aggregation and growth of Au nanoparticles and supply more active sites and high surface areas for biocatalytic reactions. The microstructure and composition of as-prepared nanocomposites were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution TEM (HRTEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrated that unique [email protected] 2 yolk-shell nanostructure with the well-dispersed Au nanoparticles confined in nanotube was obtained. The investigation of peroxidase-like activity of [email protected] 2 nanocomposites confirmed that the relative catalytic kinetic followed Michaelis–Menten behaviors. On the basis of the highly efficient peroxidase-like activity of [email protected] 2 , an effective method for colorimetric detection of H 2 O 2 and glucose was established. Considering numerous advantages including reduced aggregation, good chemical stability and high catalytic activity available by the present [email protected] 2 with unique structure, designing other yolk-shell nanostructures with exact function orientation using a similar strategy may also be very promising in the application of biocatalysis and bioassays.
研究领域:
纳米技术
·
生物传感
·
催化
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 4
·1094-1103
·
IF 5.365
Bing Liu,Yan Jiang,Yin Wang,Shuxia Shang,Yuanman Ni,Nan Zhang,Minhua Cao,Changwen Hu
Localized surface plasmon resonance (LSPR) of Au nanostructures has been applied to enhance the visible absorption and efficiency of TiO2. However, to date, most reports on photocatalysts based on Au LSPR properties have mainly focused on zero dimensional (0D) Au nanoparticles. Herein, we investigated the effect of the dimensionality of Au and the crystallinity of TiO2 in Au@TiO2 core–shell photocatalysts on visible-light H2 production. We prepared Au@TiO2 core–shell nanostructures with four different dimensionalities of Au, nanoparticles (NPs, 0D), nanorods [one dimensional (1D)], nanoprisms [two dimensional (2D)] and nanostars [three dimensional (3D)]; meanwhile we used a hydrothermal treatment method to crystallize amorphous TiO2 instead of the widely used annealing at high temperatures. The results indicate that both higher dimensionality and anisotropy of the Au core and good crystallinity of the TiO2 shell significantly enhance the visible-light catalytic activity towards H2 generation. Among these four Au@TiO2 nanostructures, Au nanostars wrapped with crystalline TiO2 show the best catalytic activity with a H2 generation rate of 76.6 μmol g−1 h−1. The analysis of these Au@TiO2 nanostructures via the finite-difference time-domain (FDTD) method indicates that both high dimensionality of Au and high crystallinity of TiO2 can lead to large electromagnetic (EM) field enhancements, which ensures an increased population of hot electrons close to the interface between the Au and the TiO2. This work may provide a facile strategy to improve the catalytic activity of visible-light plasmonic photocatalysts.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Materials Express
·
2019
·Vol. 9
·期 4
·319-327
·
IF 1.465
Zhen Deshuai,Zhong Fenfen,Yang De,Cai Qingyun,Liu Yu
A novel photoelectrode of ternary CdS/Au/TiO2 nanotube array, fabricated by electrodeposition technique and successive ionic layer adsorption and reaction (SILAR) method, shows strong photon absorption capacity and active charge transfer efficiency. A photoelectrochemical
aptasensor was developed to detect cytochrome c (cyt c) by decorating a HS-aptamer on the CdS/Au/TiO2 photoelectrode. Due to the specific binding between the cyt c and aptamer, the cyt c-aptamer complex formed and enhanced the steric hindrances and reduced the e/h
+
lifetimes, which result in a decrease in the photoelectrical current intensity. Cyt c is, therefore, also quantified based on the decrease in photoelectrical current. The developed aptasensor shows a high specificity and a high sensitivity towards to the cyt c, giving a linear range from 5
pM to 100 nM, and a limit of detection of 3.45 pM.
研究领域:
生物传感技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
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