RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 49
·期 1
·101-119
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IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation of organic pollutants.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Lili Ling,Longfei Liu,Yawei Feng,Jian Zhu,Zhenfeng Bian
TiO 2 mesocrystals can considerably enhance charge separation owing to their oriented superstructures, with fewer internal defects and porous properties providing more active sites. In this work, we prepared TiO 2 mesocrystal films by a direct annealing method. The morphology and crystal phase of the film were controlled by adjusting the ratio of NH 4 F and the calcination temperature. Moreover, we found that Au nanoparticles loaded on a TiO 2 mesocrystal film enabled highly efficient visible light photocatalytic properties. The photocatalytic activities were studied by hydrogen generation and photoreduction of Cr(VI). This work represents a considerable advance in the development and application of the TiO 2 mesocrystals.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-8
·
IF 5.479
Fang Dandan,Zhang Shupei,Dai Hong,Li Xiuhua,Hong Zhensheng,Lin Yanyu
An ultrasensitive competitive-type electrochemiluminescence immunoassay for the mycotoxin zearalenone is described. The method is based on the use of (a) a mimotope peptide that was selected from a phage displayed peptide library and used to substitute ZEN for designing the competitive assay; (b) NiFe 2 O 4 nanotubes with large specific surface area loaded with the ECL probe Ru(bpy) 3 2+ ; and (c) poly(vinylpyrrolidone) (PVP)-assisted synthesis of TiO 2 mesocrystals that acts as the sensing platform and support for antibody immobilization. Under the optimized conditions and at an ECL working potential of 1.1 V, a linear response is found for ZEN in the 0.1 to 1.0 × 10 −5 ng·mL −1 concentration range with a detection limit as low as 3.3 fg·mL −1 .
An ultrasensitive competitive-type electrochemiluminescence (ECL) immunosensor based on mimotope peptide was constructed for the detection of Zearalenone.
研究领域:
食品科学
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分析化学
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毒理学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Yilin Li,Shupei Zhang,Hong Dai,Zhensheng Hong,Yanyu Lin
This work designed a delicate signal-on photoelectrochemical sensing methodology for concanavalin A monitoring by coupling graphene-supported quasi-octahedral TiO 2 mesocrystal with an efficient enzyme-free labeling strategy. Herein, graphene with prominent conductivity could accelerate photo-generated electrons transfer, thus enhancing the photocurrent response. Currently, labeling of various enzymes was the mainly strategy for signal amplification, unfavorably, this method usually suffered inferior stability. Hence, the exploration and development of NiCo 2 O 4 labeling was proposed here, which could effectively accept the photo-induced electrons from conduction band of TiO 2 mesocrystal, leading to the decrease of the photocurrent intensity. Accordingly, a signal-on non-enzymatic photoelectrochemical sensor was constructed based on immobilized concanavalin A competing with isolated concanavalin A of various concentrations for reaction with the NiCo 2 O 4 labeled glucose conjugates. Under the optimized conditions, the photocurrent increased with the increasing concanavalin A concentration in a dynamic linear range from 0.05 ng/mL to 0.5 μg/mL, thereby proposing a general format for practical use in quantitative determination of concanavalin A. Promisingly, the successful consideration of graphene sensitized TiO 2 mesocrystal further broadened the application of excellent photoactive materials for photoelectrochemical sensing platform.
研究领域:
分析化学
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材料科学
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生物化学
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Yanjie Chen,Shupei Zhang,Hong Dai,Zhensheng Hong,Yanyu Lin
A flexible two-step photoelectrochemical (PEC)–colorimetric immunoassay was proposed for ultrasensitive detection of lipolysis stimulated lipoprotein receptor (LSR) which is found to be closely related to ovarian cancer (OC). In this paper, the Cu nanoclusters (CuNCs) enhanced multiple mixed TiO 2 mesocrystals junction (MMMJ) was fabricated via effective combination of multiple different phases TiO 2 mesocrystals (Anatase and Rutile) layers and used as a sensing platform. The strong interaction between different phases layers caused multiple amplification of signal and introduction of Cu NCs further improve PEC properties and catalytic activity to hydrogen peroxide (H 2 O 2 ) what can catalyze lecuo-methylene blue (lecuo-MB) from colorless to blue. As antibody and target antigen captured onto the MMMJ in turn, both PEC properties and catalytic activities were inhibited, leading to decreased photocurrent responses and multiply vivid color variations in lecuo-MB functionalized colorimetric films. Thus, a versatile dual-modal sensing system was developed just by utilizing enhanced MMMJ as a photoelectrode and lecuo-MB as a color change reporter molecule for PEC and colorimetric monitoring of target. Combing all of these advantages, the designed dual-modal immunoassay considerately reduced false positive or negative results during the measurement, and the unique approach for MMMJ construction may also provide a valuable guidance for designing other mixed phase junctions with superior PEC performance.
研究领域:
生物化学
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分析化学
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癌症研究
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Yanjie Chen,Shupei Zhang,Xiuhua Li,Hong Dai,Yanyu Lin
A versatile TiO 2 mesocrystals trigged signal amplification photoelectrochemical (PEC) sensing platform was designed for sensitive and accurate determination of α-fetoprotein (AFP). To construct such a biosensor, Bi 2 S 3 nanosheets with notable visible light photoactivity and biocompatibilities were employed as electron transfer mediator as well as a substrate for AFP antigen immobilization. Meanwhile, the Polyethylenimine (PEI) functionalized TiO 2 mesocrystals was used to anchor AFP antibody and the resulting composite Ab-TiO 2 -PEI was utilized as trace tag for signal amplification. The trace tag anchored onto the electrode interface via indirect competitive recognition between free target AFP and immobilized AFP to combine Ab-TiO 2 -PEI. As a result, a cascade structure of band-edge levels formed between TiO 2 mesocrystals and Bi 2 S 3 nanosheets, which notably promoted the photo-to-current conversion efficiency and enhance photocurrent response significantly. By merit of these, the concentration of AFP could be accurately determined through an indirect competitive reaction immunoassay . Upon the optimal condition, this PEC biosensor performed favorable sensitivity, selectivity and reproducibility. Hence, the designed indirect competitive PEC immunoassay possesses a potential application for clinical test and will inspire more development of simple and practical PEC sensor toward different biomolecules.
研究领域:
分析化学
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生物传感器
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光电化学
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免疫分析
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DOI
高影响因子
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