MICROCHIMICA ACTA
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2023
·Vol. 190
·期 6
·1-9
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IF 5.7
Zeng Yinan,Zhang Min,Peng Kefu,Man Zu,Guo Lu’an,Liu Wenping,Xie Shilei,Liu Peng,Xie Dong,Wang Shoushan,Cheng Faliang
A photoelectrochemical molecular imprinting sensor based on Au/TiO 2 nanocomposite was constructed for the detection of dibutyl phthalate. Firstly, TiO 2 nanorods were grown on fluorine-doped tin oxide substrate by hydrothermal method. Then, gold nanoparticles were electrodeposited on TiO 2 to fabricate Au/TiO 2 . Finally, molecular imprinted polymer was electropolymerized on the Au/TiO 2 surface to construct MIP/Au/TiO 2 PEC sensor for DBP. The conjugation effect of MIP accelerates the electron transfer between TiO 2 and MIP, which can greatly improve the photoelectric conversion efficiency and sensitivity of the sensor. In addition, MIP can also provide sites for highly selective recognition of dibutyl phthalate molecules. Under optimal experimental conditions, the prepared photoelectrochemical sensor was used for the quantitative determination of DBP and the results showed a wide linear range (50 to 500 nM), a low limit of detection (0.698 nM), and good selectivity. The sensor was used in a study of real water samples to show that it has promising applications in environmental analysis. Graphical Abstract
研究领域:
分析化学
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环境科学
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材料科学
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PubMed
高影响因子
Scientific Reports
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2019
·Vol. 9
·期 1
·1-8
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IF 4.011
Duan Zhuojun,Huang Yingzhou,Zhang Dingke,Chen Shijian
Exploiting photocatalysts with characteristics of low cost, high reactivity and easy recovery offer great potentials for complete elimination of toxic chemicals and environmental remediation. In this work, Au/TiO 2 network-like nanofibers were fabricated using a facile electrospinning technique followed by calcinations in air. Photocatalytic tests indicate that the Au/TiO 2 network-like nanofibers possess an excellent photodegradation rate of rhodamine B (RB) under UV, visible and natural light radiation. The enhanced photocatalytic activity can be attributed to the plasmonic resonance absorption of Au nanoparticles, and photogenerated electrons and holes are effectively separated by the Au/TiO 2 heterojunction structures. Furthermore, the three-dimensional network structure can provide a large number of active sites for RB degradation.
研究领域:
材料科学
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环境科学
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PubMed
高影响因子
ELECTROANALYSIS
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2012
·Vol. 24
·期 6
·1334-1339
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IF 2.872
Yang Fan,Xin Yang,Chunpeng Yang,Jinhang Liu
We describe a simple method for preparing Au-TiO 2 /graphene (GR) nanocomposite by deposition of Au nanoparticles (NPs) on TiO 2 /GR substrates. The as-prepared Au-TiO 2 /GR was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The presence of Au NPs on TiO 2 /GR surface remarkably improves the electrocatalytic activity towards the oxidation of hydrogen peroxide (H 2 O 2 ) and β -nicotinamide adenine dinucleotide (NADH). The Au-TiO 2 /GR modified glassy carbon (GC) electrode exhibits good amperometric response to H 2 O 2 and NADH, with linear range from 10 to 200 µM and 10 to 240 µM, and detection limit of 0.7 and 0.2 µM, respectively.
研究领域:
生物传感器
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电化学分析
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高影响因子
LAB ON A CHIP
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2024
·
IF 6.1
Ziran Ye,Ping Lu,Yiben Chen,Zhixian Xu,Haixia Huang,Mingjia Zhi,Zi Ang Chen,Bo Yan
We present an efficient approach for the consecutive synthesis of Au–TiO2 nanocomposites with controlled morphologies in a microfluidic chip. The seed-mediated growth method was employed to synthesize Au nanorods as the core, and TiO2 layers of varying thicknesses were deposited on the surface or tip of the Au nanorods. Au–TiO2 nanocomposites with core–shell, dumbbell, and dandelion-like structures can be precisely synthesized in a one-step manner within the microfluidic chip by finely tuning the flow rate of NaHCO3 and the amount of hexadecyl trimethyl ammonium bromide. Furthermore, we have investigated the photocatalytic activity of the synthesized nanocomposites, and it was found that Au NR–TiO2 core–shell nanostructure with a thin TiO2 shell exhibits superior catalytic performance. This work provides an effective and controlled method for the microscale preparation and photocatalytic application of various Au–TiO2 nanocomposite structures.
研究领域:
材料科学
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化学工程
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环境科学
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PubMed
高影响因子
RSC Advances
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2024
·Vol. 14
·期 32
·23011-23022
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IF 3.9
Ying Xu,Shuili Yu,Cong Huang,Zheng Xu
The photo-reduction of bromate (BrO3−) has attracted much attention due to the carcinogenesis and genotoxicity of BrO3− in drinking water. In this study, a heterojunction photocatalyst was developed by depositing Au nanoparticles (NPs) onto P25 TiO2 NPs through a one-pot, solvent-thermal process. Due to the unique properties of Au, the Au NPs deposited on the TiO2 surface created a Schottky barrier between the metal and the semiconductor, leading to an effective separation of photo-generated charge carriers as the Au nanoparticles served as electron sinks. The Au/TiO2 photocatalyst demonstrated efficient reduction of BrO3− under UV light illumination without the need for sacrificial agents. The effect of different Au loading of Au/TiO2 was systematically investigated for its influence on the generation of electrons and the reduction ability of BrO3−. The results indicate that the 1% Au/TiO2 catalyst exhibited a higher concentration of localized electrons, rendering it more effective in BrO3− removal. The photocatalytic efficiency for BrO3− reduction decreased upon the addition of K2S2O8 as an electron quencher, suggesting that the primary factor in this photo-reduction process was the availability of electrons. These findings hold promise for the potential application of the Au/TiO2 catalyst in the removal of BrO3− from drinking water through photo-reduction.
研究领域:
环境科学
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材料科学
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饮用水处理
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Duo Zhao,Shiyu Jiang,Junao Zhang,Fengguo Zhu,Yue Wang,Ying Guo,Siyu Qian
In heterogeneous photocatalytic reactions, understanding the catalytic processes and its kinetics is crucial for catalyst design and performance evaluation. However, real-time monitoring the interface reaction such as pollutant degradation remains a challenge. In this study, the implantable optical fiber sensors with real-time catalytic monitoring capability were created by modifying the sensing surface with Au/TiO 2 heterojunction photocatalysts. As pollutants adsorb and degrade on the catalytic interface, surface refractive index changes occur. The evanescent field on the sensing surface covers the photocatalytic layer, enabling in situ and real-time monitoring of surface refractive index changes for catalytic reaction analysis. The flexible fiber-optic Surface Plasmon Resonance (SPR) sensors can be directly immersed in a pollutant solution Rhodamine 6 G (R6G) to monitor its degradation rate and kinetic processes. It reveals that the optimal size of Au nanoparticles (AuNPs) can facilitate efficient electron transfer at heterojunction catalysts. The time-resolved resonance wavelength shift further elucidates the degradation kinetics of photocatalysts with varying Au/TiO 2 composition. The fiber-optic sensor demonstrated comparable accuracy to conventional UV-Vis spectrophotometry in assessing TiO 2 photocatalytic degradation (84.13 % vs. 81.25 % efficiency, respectively), with a relative deviation less than 5 %. However, unlike the discrete data collected by traditional UV-Vis methods, the miniaturized and implantable fiber-optic SPR sensor can collect data every 0.25 s. It demonstrates real-time monitoring capability and enables more accurate evaluation of dynamic reaction processes. This in situ sensing strategy provides new insights into photocatalytic mechanisms and shows great potential for guiding catalyst design and optimization.
研究领域:
化学传感器
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光催化
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纳米技术
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环境化学
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光纤技术
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催化动力学
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高影响因子
Chemistry-An Asian Journal
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2020
·Vol. 15
·期 24
·4280-4285
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IF 4.056
Zhipeng Sun,Lei Sheng,Hao Gong,Li Song,Xiaolong Jiang,Shengyao Wang,Xianguang Meng,Tao Wang,Jianping He
In this work, a series of gold-supported titanium oxide composites have been prepared and high selectivity (over 90%) of hydrogen peroxide is achieved. For the first time, electrochemical impedance spectroscopy and electron spin resonance analysis demonstrate that high charge transfer impedance of the catalyst can suppress the decomposition of OOH* intermediates thus promoting the two-electron process of the oxygen reduction reaction.
研究领域:
电催化
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材料科学
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能源化学
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纳米材料
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环境化学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 5
·4138-4145
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IF 1.798
Yu Mei,Meng Yanbing,Zhang Jindan,Liu Jianhua,Li Songmei
Super helical Au/TiO 2 nanocomposites were synthesized using plasmid DNA and incorporated into photoanode of dye-sensitized solar cells (DSSCs). The performance of photoanode films and DSSCs was investigated. Plasmid DNA can not only support as bio scaffold to synthesize Au/TiO 2 nanocomposites, but also act as an effective reducing agent under ultraviolet (UV) irradiation. Compared with TiO 2 -only DSSCs, the light harvesting (LH), corresponding photocurrent and power conversion efficiency (PCE) of DSSCs were enhanced by incorporating of mechanically mixed Au-TiO 2 NPs and Au/TiO 2 nanocomposites. Compared to the TiO 2 -only DSSCs samples (5.12%), the PCE of DSSCs with mechanically mixed Au-TiO 2 nanoparticles (NPs) (6.41%) increased by 25.20%, and DSSCs with Au/TiO 2 nanocomposites (8.17%) increased by 59.57%. The best PCE (8.24%) of DSSCs was obtained with the incorporation of Au/TiO 2 nanocomposites. Two reasons were presented for the best performance of DSSCs with Au/TiO 2 nanocomposites. Firstly, the localized surface plasmon resonance (LSPR) effect of Au NPs enhanced the absorption visible light. Secondly, the super helical structure of Au/TiO 2 nanocomposites provided a path for the transmission of photoelectrons.
研究领域:
材料科学
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纳米技术
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太阳能
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光化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Weilin Zhong,Chao Wang,Hailun Zhao,Suqing Peng,Zhipeng Tian,Riyang Shu,Ying Chen
Constructing efficient photothermal catalysts and understanding their photothermal synergistic effects for solar-driven conversion of biomass derivatives towards clean energy carriers are essential in the development of renewable energy and waste disposal. In this study, Au nanoparticles loaded on TiO 2 nanoflakes were synthesized as photothermal catalysts for bio-derived glycerol photothermal reforming hydrogen production. The results found that the generation of photogenerated carriers is a crucial process in the photothermal reforming of glycerol. In particular, the hot electrons excited by plasmonic Au nanoparticles did not participate in the hydrogen production reaction through neither direct nor indirect transfer. Instead, the hot carriers promoted the intermolecular collisions between reactants through thermalization. In addition, such generated local heat could reduce the semiconductor impedance and improve the migration efficiency of photogenerated carriers, resulting in an efficient conversion of gas phase intermediates. As obtained, photothermal enhanced reforming can improve hydrogen yield by 58%, while the hydrogen generated constant and the absorption equilibrium constant was calculated as 2.38 mmol∙g −1 ∙h −1 and 7.00 mL∙mmol −1 .
研究领域:
能源化学
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材料科学
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催化化学
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DOI
高影响因子
Nature Communications
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2026
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IF 18.1
Zhang Mengya,Yu Tongcheng,Liu Hao,Lin Chao,Yang Yaping,Lv Bowen,Zhang Qi,Chen Ming,Wang Tianshuai,Hua Weihong,Han Kai
Monitoring the evolution of molecules during photo and thermal synergistically induced physical and chemical processes is of paramount interest in fields including chemical, material, and energy research. Surface-enhanced Raman spectroscopy (SERS) is a highly promising technology in this regard, offering advantages of sensitivity, real-time, and label-free detection. However, the application of conventional SERS in high-temperature environments has faced challenges due to the inevitable loss of activity and decline in sensitivity. Herein, we synthesize Au-TiO 2 nanoarrays as SERS substrates, and an anomalous enhancement of Raman signal with increasing temperature is observed. The signal intensity increases by 11.41 times at 180 °C compared to that at 22 °C. This high-temperature enhancement in Raman activity is attributed to an underlying mechanism: heat-assisted hot-hole transfer, which enables 785 nm photon-induced hot-hole transfer from Au to TiO 2 . Our work expands the application of the SERS technique for high-temperature chemical analysis and molecular diagnostics.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 1
·277-288
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IF 2.41
Cao Zhihai,Yang Liu,Chen Hangnan,Xu Chang,Qi Dongming,Zhu Shudi,Ziener Ulrich
Au/amorphous TiO 2 nanocomposite particles with high visible-light photocatalytic activity were conveniently prepared in inverse miniemulsions. The materials were synthesized through a combination of a sol–gel process and in situ reduction of HAuCl 4 by hydrazine to Au nanoparticles in the nanocomposite particles. The photocatalytic activity of the as-synthesized Au/amorphous TiO 2 nanocomposite particles is much higher than that of the Au/anatase TiO 2 and Au/rutile TiO 2 nanocomposite particles prepared by calcination. Therefore, no further heat treatments are required to achieve visible-light photocatalytic active catalysts. The loading of Au in the nanocomposite particles could be conveniently tuned by varying the HAuCl 4 loading in the dispersed phase of the inverse miniemulsions. Only a small amount of Au was required to achieve a high photocatalytic activity. The size, particle morphology, TiO 2 phase, optical property, elemental content and distribution, and pore properties of the Au/TiO 2 nanocomposite particles were systematically characterized by dynamic light scattering, transmission/scanning electron microscopy, X-ray diffraction, Raman spectroscopy, UV–vis spectroscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and N 2 sorption measurements.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Kejie Jin,Mian Qin,Xinyi Li,Rui Wang,Yang Zhao,Huan Wang
Semiconductor photocatalysis can be regarded as one of effective strategies to overcome the great challenges encountered with conventional technologies for environmental remediation. In this research, Z-scheme heterostructure composed of core–shell Au@TiO 2 nanoparticles and flower-like Bi 2 WO 6 nanosheets has been successfully prepared through the reverse micelle sol–gel method followed by a hydrothermal process. The structural characteristics, chemical compositions and photoelectrochemical properties of this ternary composite photocatalyst (Au@TiO 2 /Bi 2 WO 6 ) were further investigated in detail. Benefitted from the synergy of the heterojunction construction and metallic surface plasmon resonance effect, the Au@TiO 2 /Bi 2 WO 6 with an optimal mass ratio of Au@TiO 2 to Bi 2 WO 6 exhibited the significantly enhanced photocatalytic activity for degradation of antibiotics under visible-light irradiation, in which the degradation efficiency of sulfamethoxazole (SMX) and tetracycline hydrochloride (TC) could be up to 96.9% and 95.0% within 75 min, respectively. The reaction rate constant for SMX and TC degradation was calculated to be around 0.0425 min −1 and 0.0314 min −1 , which has 7.2 times and 1.9 times enhancement compared with single Bi 2 WO 6 , respectively. In addition, the cyclic stability and photocatalytic mechanism of Au@TiO 2 /Bi 2 WO 6 were further verified. Our primary results provide a feasible strategy to develop core–shell heterostructured photocatalysts with superior performance for the efficient removal of low-concentration antibiotics in water.
研究领域:
环境科学
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材料科学
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化学工程
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高影响因子
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