Environmental Science-Nano
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2019
·Vol. 6
·期 3
·948-958
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IF 7.704
Weiping Zhang,Guiying Li,Hongli Liu,Jiangyao Chen,Shengtao Ma,Taicheng An
A facile micro/nano-bubble method was firstly applied to synthesize an Au/TiO2@CNT composite photocatalyst for photocatalytic degradation of gaseous styrene. The morphologies, structures and compositions of the photocatalysts were investigated by using a series of analytical techniques (scanning and transmission electron microscopy, FT-IR spectroscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy). The micro/nano-bubbles can effectively facilitate the reaction of Au and TiO2 NPs decorated onto CNTs, forming a stable ternary composite structure. The photocatalytic performance of Au/TiO2@CNTs was investigated by the methodology of central composite design (CCD) in response surface methodology (RSM). The photocatalytic degradation and mineralization of styrene over Au/TiO2@CNTs drastically increased with the rise of reaction temperature due to the formation of a compact structure. The analysis of EPR, UV-vis DRS, electrochemical properties and TPD-O2 further revealed the enhanced photocatalytic mechanism of Au/TiO2@CNTs. The further identification of free radicals showed that the photocatalytic degradation and mineralization of styrene were closely related to oxidative radicals such as hydroxyl radicals and superoxide radicals, which were mainly attributed to the synergistic effects of Au NPs and CNTs to enhance the photocatalytic activity. This work will provide a new insight into designing photocatalysts with high photocatalytic performance and stability for the degradation of hazardous VOCs.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Lvhong Gong,Shengxi Wu,Junjie Liu,Mingjun Zhang,Jinghao Zhuang,Doudou Xu
An ultrasensitive immunosensor of Cys/Au@TiO 2 based on disposable screen-printed electrodes (SPE) for PIVKA-II detection for hepatocellular carcinoma (HCC) diagnosis was developed by utilizing Cystine (Cys) and nanocomposite Au@TiO 2 . Firstly, HAuCl 4 underwent a reduction reaction with NaBH 4 , then Au nanoparticles were coated onto TiO 2 nanoparticles. Followed, Cys/Au@TiO 2 was formed through self-assembly of cysteine to allow the monoclonal antibody of abnormal thrombospondin to bound to the amino group on the surface of the composite by covalent bonding. The mechanism is to determine the changes in the current of the sensor caused by the specific binding of the abnormal prothrombin monoclonal antibody adsorbed by the complex with its antigen. The Cys/Au@TiO 2 immunosensor was fully characterized by various analytical approaches and it showed a wide linear testing range of 1–10000 pg mL −1 (R 2 = 0.991) and the limit of detection down to 0.77 pg ml −1 , with highly sensitivity and specificity. The results showed that the developed immunosensor platform can effectively detect trace amounts of PIVKA-II protein and has potent clinical application for HCC diagnosis.
研究领域:
生物医学工程
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分析化学
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癌症诊断
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 24
·12034-12042
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IF 8.867
Rundong Fan,Ligang Wang,Yihua Chen,Guanhaojie Zheng,Liang Li,Ziliang Li,Huanping Zhou
Among the various methods to advance solar cell technologies, the implementation of nanoparticles with plasmonic effects is an effective way to make better use of incident light and manage carrier dynamics. Herein, for the first time we report the systematic synthesis of gold nanospheres or nanorods coated with a thin layer of titanium oxide (Au@TiO2) and use them to examine the plasmonic effect in planar heterojunction perovskite solar cells. The most efficient assembly mode is to embed the Au@TiO2 nanorods into the electron transport layer (ETL), which elevates the average power conversion efficiency (PCE) from 15.76% to 16.35%, mainly attributed to the short-circuit current enhancement. The optimized device assembled with Au@TiO2 nanorods delivers an efficiency of 20.10%. We further explored the plasmonic enhancement effect of Au@TiO2 nanorods based on the combination of UV-visible absorption spectroscopy, incident photon-to-current efficiency (IPCE), photoluminescence (PL) and transient photocurrent decay (TPC). The results indicate better charge separation/transfer as well as facilitated carrier transport in the presence of plasmonic particles. This work provides an insightful understanding of plasmonic effects in planar perovskite solar cells and also presents a promising approach for simultaneous photon and electron management.
研究领域:
材料科学
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纳米技术
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可再生能源
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光伏技术
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DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2013
·Vol. 114
·期 20
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IF 2.21
He Wangxiao,Huang Hongen,Yan Jin,Zhu Jian
The formation of the Au-TiO 2 nanocomposite on monolayer Graphene (GTA) by sequentially depositing titanium dioxide particles and gold nanoparticles on graphene sheet was synthesized and analyzed in our work. The structural, morphological, and physicochemical properties of samples were thoroughly investigated by UV-Vis spectrophotometer, Raman spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, scanning electron microscope, and transmission electron microscope. Photocatalytic performance of GTA, graphene (GR), TiO 2, and TiO 2 -graphene nanocomposite (GT) were comparatively studied for degradation of methyl orange, and it was found that GTA had highest performance among all samples. More importantly, antibacterial performance of this novel composite against Gram-positive bacteria, Gram-negative bacteria, and fungus was predominant compared to GR, TiO 2 , and GT. And the result of biomolecules oxidation tests suggested that antimicrobial actions were contributed by oxidation stress on both membrane and antioxidant systems. Besides, the rate of two decisive processes during photocatalytic reaction, the rate of the charge transfer (k CT ) and the rate of the electron-hole recombination (k R ) have been studied by Perturbation theory, Radiation theory, and Schottky barrier theory. Calculation and derivation results show that GTA possesses superior charge separation and transfer rate, which gives an explanation for the excellent oxidation properties of GTA.
研究领域:
材料科学
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纳米技术
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化学工程
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环境科学
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生物学
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DOI
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 21
·7060-7071
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IF 6.119
Kaiyue Zhang,Guilong Lu,Feng Chu,Xiubing Huang
Thermo-enhanced photocatalysis has been reported as a potential strategy for improving the activity, whereas the relationship between thermal energy and the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles has been rarely investigated. Herein, photocatalytic selective aerobic oxidation of amines to imines is investigated under visible light irradiation over heterostructured TiO2(B)/anatase and Au/TiO2 nanobelts at specific temperatures (20–60 °C). The surface amine substrate complexed on TiO2 could broaden the visible-light absorption region via the ligand-to-metal charge transfer (LMCT) effect. Interestingly, the pristine TiO2 achieves the best photocatalytic performance (>99% benzylamine conversion and >99% N-benzylidenebenzylamine selectivity) at 60 °C after 12 h irradiation while the Au nanoparticles (NPs) are observed to improve the activity of TiO2 only in a low temperature range (<40 °C). Moreover, excessive Au NPs loaded on TiO2 could inhibit the amine conversion and reduce the imine selectivity in the whole temperature range of 20–60 °C, which is attributed to the decreased oxygen vacancies and poor amine adsorption ability on the surface of Au/TiO2. A plausible explanation is finally proposed that the substrate–TiO2 complex, instead of plasmonic Au NPs, plays a vital role in achieving good amine conversion and imine selectivity.
研究领域:
光催化
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材料科学
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化学工程
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物理化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hailun Zhao,Chao Wang,Weilin Zhong,Suqing Peng,Riyang Shu,Zhipeng Tian,Ying Chen
Probing the effect of spatial morphology of catalyst on its photothermal catalytic performance is crucial for solar-driven renewable catalytic reforming of hydrogen production . In this study, Au nanoparticles loaded on various morphologies of TiO 2 nanoparticles were synthesized and characterized. The experimental results indicated that decorating TiO 2 with Au nanoparticles could dramatically increase its photocatalytic activities by 20–40 times. The photothermal conversion efficiency of Au/TiO 2 (12.74%–25.54%) was higher than those of TiO 2 due to the introduction of LSPR of Au nanoparticles could effectively improve the utilization of solar spectrum. Titania nanoflower (TNF) nanoparticles with high light absorption capacity , better colloidal dispersion stability , porous properties and narrow band gap represented the highest H 2 productivity (144.13 μmol·g −1 ·h −1 ). The coarse surface structure was also conducive to the dispersion of gold particles on the surface of the carrier and the growth rate of Au/TNF hydrogen production (40 times) which was higher than that of other morphology within 2 h. The results of glycerol photothermal hydrogen generation highlighted the effect of temperature on colloidal dispersion stability and hydrogen production capability of nanoparticle suspension. It demonstrated that the photothermal effect aroused a temperature rise that would deteriorate the dispersion stability of the suspension although a local entropy increase in the catalyst nanoparticles might occur. At the same time, the temperature rise caused by the photothermal effect efficiently produces hydrogen in the reaction temperature range. Therefore, an ideal temperature setting for maximal hydrogen generation could be validated and improved the photothermal synergistic impact on biomass-reformed hydrogen generation.
研究领域:
化学工程
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材料科学
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可再生能源
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Liuqing Li,Yaping Wang,Yu Ruan,Tiefeng Xu,Shaoyi Wu,Wangyang Lu
The photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is important to facilitate the conversion of biomass into high-value compounds under mild conditions. This study developed Au/TiO 2 catalysts through the urea deposition method, subsequently integrating them with iron phthalocyanine (FePc) via ball milling, resulting in FePc/Au-TiO 2 . These catalysts were calcined at various temperatures. The results indicated that Au nanoparticles are uniformly dispersed on TiO 2 , and Fe in FePc/Au TiO 2 calcined at 410 °C mainly exists in the form of ferrosoferric oxide (Fe 3 O 4 ). FePc/Au-TiO 2 with 30 % FePc which calcined at 410 °C demonstrated outstanding photocatalytic activity, achieving a 97 % yield of FDCA. The effects of various experimental parameters on the conversion of HMF to FDCA were investigated, such as the calcination temperatures, the FePc amount, base, and catalyst dosage. Electron paramagnetic resonance and active species capture tests revealed the catalyst can convert O 2 into •O 2 – and 1 O 2 through excited electrons and photogenerated holes. This study highlights the role of interfacial coupling interactions in boosting catalytic performance, offering a novel approach for photocatalyst development in converting HMF to FDCA.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Chaogang Ban,Bing Li,Jiangping Ma,Yajie Feng,Chi Lin,Yu Chen,Yang Wang,Youyu Duan,Kai Zhou,Liyong Gan,Shaoming Wang,Xiaoyuan Zhou
The overreliance on non-renewable energy sources like fossil fuels has led to severe energy crises and environmental pollution, hindering sustainable development. Harnessing solar energy for water splitting through semiconductor photocatalysts offers a promising solution. Titanium dioxide (TiO 2 ), a benchmark photocatalyst, is favored for its cost-effectiveness, non-toxicity, and stability under ultraviolet light. However, its weak light absorption, limited range, and high carrier recombination rates pose challenges. Herein, we designed an Au nanoparticle modified TiO 2 (Au/TiO 2 ) using a two-step method involving initial stirring adsorption followed by calcination . This composite material exhibits a localized surface plasmon resonance property, demonstrating powerful light absorption capacity in both the visible and near infrared regions. Moreover, following the decoration of Au nanoparticles, in situ XPS reveal Au/TiO 2 exhibits a metal-support interaction, thereby enhancing the separation and migration of photogenerated carriers and decreasing the recombination rate of photogenerated charges. Thus, Au/TiO 2 shows a photocatalytic hydrogen evolution rate of 47.89 mmol g −1 h −1 , which is 39.25 times higher than that (1.22 mmol g −1 h −1 ) of pristine TiO 2 and among the top rankings of TiO 2 -based photocatalysts. This study provides a novel approach to developing a photocatalyst capable of absorbing a broad spectrum of solar energy.
研究领域:
材料科学
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环境科学
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能源研究
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2021
·
IF 2.328
Lina Lin,Qilan Zhong,Yunzhe Zheng,Yan Cheng,Ruijuan Qi,Rong Huang
A model system of oxygen vacancy modified titanium dioxide (TiO 2-x ) nanobelts supported Au nanoparticles with different sizes is prepared for methylene blue photodegradation. The Au/TiO 2-x heterostructure with the smallest Au size exhibits the best performance than other samples. Based on detailed microstructural investigations, the effect of Au particle size on the photocatalytic performance is revealed in the view points of electron transfer mechanism and interface microstructure. It implicates that although the size effect determines the overall photoelectric properties of samples, it is the number and transport behavior of carriers at the interface that fundamentally affect the photocatalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 53
·30163-30170
·
IF 2.936
Lei Feng,Gang Li,Yueer Yan,Wenrong Hou,Yahong Zhang,Yi Tang
The present work deals with the one-pot conversion of C6 sugars to methyl glycerate and glycolate via a cascade of retro-aldol condensation and oxidation processes catalyzed by using MoO3 as the Lewis acid catalyst and Au/TiO2 as the oxidation catalyst in methanol. Methyl glycerate (MGLY) is the product of C6 ketose (fructose), while methyl glycolate (MG) is produced from C6 aldose (mannose, glucose). It is found that a good one-pot match between two reactive processes is the key to the production of MGLY and MG with high yield (27.6% MGLY and 39.2% MG). A separated retro-aldol condensation and oxidation process greatly decreases their yields, and even no MGLY can be obtained in this separated process. We attribute this to high instability of glyceraldehyde/glycolaldehyde and their different reaction pathways which mainly depend on whether acetalization of retro-aldol products (glyceraldehyde and glycolaldehyde) occurs with methanol or not. This result opens a new prospect on the accumulation of C3 products other than lactate from biomass-derived carbohydrates.
研究领域:
化学工程
·
催化
·
生物化学
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DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2026
·Vol. 48
·期 12
·509
·
IF 4.3
Abudureyimu Mukaidasi,Chen Xi,Zhu Xiaoxuan,Huang Yu,Wang Yehui
Naphthalene, as a representative polycyclic aromatic hydrocarbon (PAH), is persistent, bioaccumulative, and toxic, posing a long-term threat to aquatic environments. To address this issue, a mineral-mediated Au-TiO 2 /g-C 3 N 4 composite photocatalyst with coupled adsorption and photocatalytic functions was constructed through photodeposition, co-pyrolysis, and subsequent in situ mineral loading/calcination. Characterization analyses demonstrated that 1.0 wt% Au provided the most effective electronic modulation, giving an apparent rate constant of 0.174 min −1 for naphthalene degradation, which was 3.78 times that of the Au-free counterpart. Among the tested mineral supports, bentonite exhibited the strongest adsorption-enrichment effect, increasing the adsorption efficiency to 47.2% and enabling complete removal and near-complete mineralization of naphthalene within 25 min of irradiation. Radical trapping experiments and ESR spectra identified ·OH, ·O 2 − , and h + as the dominant reactive species. Combined with Gas Chromatography-Mass Spectrometry (GC-MS) and in situ Gas Chromatography (GC) analyses, naphthalene was found to undergo progressive hydroxylation, ring opening, and oxidation before final mineralization. This work provides a feasible strategy for designing mineral-semiconductor composite photocatalysts for efficient PAH removal from water.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Lin Dong,Jordi Morales-Vidal,Lili Mu,Licheng Li,Núria López,Javier Pérez-Ramírez,Zupeng Chen
5-Methylfurfural (MF) is a critical commodity chemical used as food additive and synthetic intermediate. Opening a sustainable route towards highly selective synthesis of MF from 5-hydroxymethylfurfural (HMF) is of great significance, but has demonstrated extremely challenging. Herein, we report an efficient process for the selective production of MF from HMF over an anatase-supported gold catalyst (Au/a-TiO 2 ). During the hydrogenolysis of HMF, the desired C O bond is maintained and MF can be obtained in a high yield of 83.1 %, exhibiting excellent stability both in batch and flow operation. A combination of experimental and theoretical analyses attribute the superior performance of Au/a-TiO 2 to the synergistic effect of limited H access, low adsorption of reactants, and avoiding condensation, driven by the high concentration of oxygen vacancies in the support. This study highlights a novel approach of tailoring the coverage of active species for the selective transformation of renewable compounds into high-value-added chemicals.
研究领域:
化学工程
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催化科学
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可再生资源转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）