APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhongwei Zou,Haiming Xu,Dongya Li,Jingyu Sun,Dongsheng Xia
The 2D BiOCl nanosheets with excellent photocatalytic activity were synthesized via the facile hydrothermal method by regulating the pH value of the precursor solution and using dulcitol (C 6 H 14 O 6 ) as the surfactant. The photocatalysts were characterized by XRD, FT-IR, SEM, TEM, BET, XPS, ESR, O 2 -TPD, EIS, DRS and PL. The results of morphological and structural characterization indicate that the pH has a large effect on the thickness of the nanosheets and the exposure ratio of {0 0 1} facets. The photocatalytic property of the sample prepared at pH 4 showed excellent visible-light photocatalytic performance to degrade RhB owing to the small thickness, the exposed {0 0 1} facets and the optimum concentration of oxygen vacancy. Moreover, the reasonable photocatalytic mechanism was revealed by the active species trapping experiments and ESR characterization, which suggested O 2 − and h + are the main active species in the present system.
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
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Guozhong Zhang,Shuqu Zhang,Longlu Wang,Ran Liu,Yunxiong Zeng,Xinnian Xia,Yutang Liu,Shenglian Luo
The scrupulous design of hierarchical structure and highly active crystal facets exposure is essential for the creation of photocatalytic system. However, it is still a big challenge for scrupulous design of TiO 2 architectures. In this paper, bird’s nest-like anatase TiO 2 microstructure with exposed highly active (001) surface has been successfully synthesized by a facile one-step solvothermal method. Methylene blue (MB) is chosen as a model pollutant to evaluate photocatalytic activity of as-obtained TiO 2 samples. The results show that the photocatalytic activity of the bird’s nest-like sample is more excellent than P25 in the degradation of MB due to high specific surface area and highly active (001) crystal facets exposure when tested under simulated solar light. Besides, it can be readily separated from the photocatalytic system by sedimentation after photocatalytic reaction, which is a significant advantage against conventional powder photocatalyst. The bird’s nest-like microspheres with novel structure may have potential application in photocatalysis and other fields.
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
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 2
·1204-1209
·
IF 1.483
Zheng Yan,Wang Junpeng,Yang Ping
Anatase TiO2 with exposed {001} facets were synthesized via solvothermal method by using titanium (IV) butoxide as Ti source, hydrofluoric acid as capping agent and alcohol as solvent. Different alcohols such as methanol, ethanol, isopropyl alcohol, and n-butanol were investigated
systematically. As-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscope and transmission electron microscope. The results indicated that regular TiO2 nanosheets were created from ethanol and isopropanol alcohol even though the size
and thickness changed. However, TiO2 nanosheets were attached together in methanol and n-butanol. The reasons of solvent effect the morphology and properties of TiO2 crystals exposed {001} facets have been discussed. The photocatalysis investigation of samples was carried
out by degradating methyl orange under ultraviolet light irradiation. TiO2 nanosheets obtained in ethanol solvent exhibited superior photocatalytic performance compared with other samples. The reasons could attribute to TiO2 nanosheets obtained in ethanol solvent with
higher specific surface area, mesoporous structure, and exposed highly active {001} facets.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shenman Yao,Dehua Wang,Jiahao Li,Jianxian You,Yulin Zhu,Wufei Gong,Keng Xu,Yan Liang,Yanxing Yang,Yong Yang
Crystal facets engineering emerges as a potent strategy for modulating the surface properties and gas sensing performance of semiconductor metal oxides. However, related studies have primarily focused on conventional binary metal oxides gas sensing materials, while few studies have investigated the crystal facets-dependent gas sensing activity of recently developed ternary metal oxides. Herein, the effect of crystal facets on the gas sensing activity of Aurivillius-type layered perovskite structure material Bi 2 MoO 6 was studied. It was shown that Bi 2 MoO 6 nanosheets with {001} crystal facets exhibited significantly enhanced gas sensing activity with a high response value of 72 (R a /R g ) towards 100 ppm of triethylamine at relatively low working temperature of 250 °C, which was about 10 times higher than that of Bi 2 MoO 6 nanosheets with {010} crystal facets. The gas mechanism was elucidated at the atomic and electronic levels through first principles calculation combined with experimental characterization. On the one hand, the synergistic effect of Mo/Bi bimetallic sites makes the adsorption/charge transfer between {001} facets and triethylamine much stronger. On the other hand, {001} facets have abundant chemically adsorbed oxygen and oxygen vacancy on the surface, which act as the active species in gas sensing. These results not only significantly broaden the application scope of Aurivillius-type layered perovskite structure materials in the realm of gas sensing, but also provide important guidance for the study of gas sensing mechanism in ternary metal oxides.
研究领域:
材料科学
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气体传感技术
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 24
·8516-8524
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IF 5.287
Lei Huang,Kaiwen Zha,Supawadee Namuangruk,Anchalee Junkaew,Xin Zhao,Hongrui Li,Liyi Shi,Dengsong Zhang
Surface engineering of TiO2 is significant in the SCR reaction and worth studying. In a previous study, we found that TiO2 nanosheets (TiO2-NS) with the (001) plane exhibited a much better SCR performance than TiO2 nanoparticles (TiO2-NP) with the (101) plane. In this work, in situ DRIFTS and DFT calculations were applied to address the promotional effect of the (001) plane of TiO2-NS in the SCR reaction. The behavior of adsorption and desorption of NOx and NH3 on the two surfaces was studied. It was found that NH3 adsorbed on both TiO2-NS and TiO2-NP was in the form of NH3(g) on the Lewis acid sites. NOx on TiO2-NP were mainly trans-(NO)2 and N2O4 which were non-reactive. Differently, NO on TiO2-NS was mainly in the form of NO2 which was probably due to the high energy and abundant active oxygen species of the (001) facet. The formed NO2 could trigger the subsequent ‘fast SCR’ reaction thereafter promoting the activity. Therefore, TiO2-NS with more (001) facets had better SCR activity than TiO2-NP with the exposed (101) facet.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 19
·15485-15491
·
IF 3.289
Yan Zheng,Zhixiang Jiang,Ping Yang
Carambola-like TiO2 consisting of nanosheets with exposed {001} facets was synthesized via a one-step solvothermal method for the first time. The carambola-like TiO2 was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller nitrogen adsorption isotherm experiments. The formation mechanism of the carambola-like TiO2 is discussed by investigating the effect of reaction time, temperature and the volume of hydrofluoric acid. The results from different growth stages demonstrated that the formation of carambola-like TiO2 included alcoholysis of precursor to nucleation, nuclei growth, dissolution–recrystallization growth and further growth. Reaction temperatures affected the morphologies and surface areas of carambola-like TiO2 samples. The photocatalytic performances of samples prepared at different temperatures were tested. The carambola-like TiO2 sample prepared at 160 °C exhibited the best photocatalytic activity. Such enhanced photocatalytic performance is ascribed to the large surface area and the exposed {001} facets with high activity.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Zhiqiao He,Qiaolan Cai,Ming Wu,Yuanqiao Shi,Huiying Fang,Lingdan Li,Jiancheng Chen,Jianmeng Chen,Shuang Song
In the present work, reduction of Cr(VI) induced by UV–visible light in aqueous solution was investigated. The aqueous medium contained TiO2 nanosheets and no additional reducing agents or hole scavengers. A hydrothermal method was used to synthesize fluorinated TiO2 nanostructures with various percentages of exposed {001} facets and initial F/Ti ratios. Fluorine-free TiO2 nanosheets were obtained by washing the TiO2 samples with NaOH solution. The surface fluorination facilitates the adsorption process by increasing the number of surface OH groups generated. Moreover, fluorination efficiently inhibits the recombination of photogenerated electron–hole pairs. The {001} facets have an indirect role in the photocatalytic reduction of Cr(VI) because oxidative dissolution of H2O occurring on {001} facets and Cr(VI) reduction occurring on {101} facets are simultaneous reactions. The optimal ratio of exposed {001} to {101} was found to be ∼72:18.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 5
·1515-1519
·
IF 2.61
Meichao Gao,Dafeng Zhang,Xipeng Pu,Mingtong Li,Young Moon Yu,Jae Jeong Shim,Peiqing Cai,Sun Il Kim,Hyo Jin Seo
Bismuth oxychloride (BiOCl) was synthesized by a simple combustion method. The structures, morphologies, absorbance, optical, and photocatalytic properties of the samples were studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectrophotometry, and photoluminescence. The experimental results show that BiOCl microsheet with high percentage of exposed {001} facets was obtained. It is interesting to note that the thickness of BiOCl sheets, in other words, the percentage of exposed {001} facets can be modulated through changing the added amount of ammonium chloride. The sample with the thinnest BiOCl sheets shows the best photodegradation performance of Rhodamine B under ultraviolet light irradiation, which can be attributed to the cooperative effect between the high percentage of exposed {001} facets and high-specific surface area. Moreover, the corresponding influencing mechanism on the percentage of exposed {001} facets of BiOCl was discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 15
·3876-3882
·
IF 5.365
Xiaogang Liu,Yingpu Bi
Ti3+-doped TiO2 nanosheets with different percentages of exposed {001} facets were synthesized by aluminium (Al) reduction. The structure, crystallinity, morphology, and other properties of the as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Electron paramagnetic resonance spectra confirm the presence of paramagnetic Ti3+ species in the prepared Ti3+-doped TiO2. Under UV-visible light irradiation, all the Al-reduced TiO2 nanosheet samples exhibit higher photocatalytic hydrogen evolution, degradation of methyl orange (MO) and photoelectrochemical (PEC) performance than the non-reduced ones. The Al-TiO2-HF6 sample with the highest Ti3+ concentration and optimal exposed {001} facets exhibits the most excellent photoreactivity, which is mainly ascribed to the efficient transport and separation of photo-induced charge carriers resulting from the synergistic effects between Ti3+ doping and facet regulation.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 8
·
IF 2.504
Haijin Liu,Peiyao Li,Haokun Bai,Cuiwei Du,Dandan Wei,Yuzhao Su,Yuqian Wang,Lin Yang
Anatase TiO2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO2, and combined with the surface of {001} TiO2. The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light (λ > 390 nm) and visible light (λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 33
·12479-12484
·
IF 5.101
Liqun Ye,Lihong Tian,Tianyou Peng,Ling Zan
Highly symmetrical BiOI single-crystal nanosheets (BiOI SCNs) with dominant exposed {001} facets (up to 95%) have been synthesized by annealing BiI3 and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, fast-Fourier transform pattern, UV-vis diffuse reflectance and photoluminescence. The thickness and the {001} facets percentage of BiOI SCNs can be tuned by changing the annealing temperature. The thermal decomposition process of BiI3 and the formation mechanism of BiOI SCNs were investigated. BiOI SCNs exhibit higher photoactivity (about 7 times) than irregular BiOI for degradation of Rhodamine B (RhB) dye under visible light irradiation. The {001} facets are the reactive facets of BiOI. The origin of {001} facets-dependent photoactivity is due to an improvement of the separation efficiency of photo-induced electrons and holes.
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
·
2021
·Vol. 14
·期 11
·2870
·
IF 3.623
Jian Di,Haibo Yan,Zhuoyu Liu,Xing Ding
In this paper, we report a novel and simple method for synthesizing the microspheres self-assembled from ultrathin anatase TiO2nanosheets with a high percentage of (001) facets via the hydrolysis process of the single-reagent (potassium fluorotitanate). We then used optical microscopy, scanning electron microscopy, and high-resolution confocal laser Raman spectroscopy to characterize the microspheres generated under different conditions. The study found that the size of the anatase TiO2microspheres synthesized was 0.5–3 μm. As the synthesis time increased, the corroded surface of the microspheres gradually increased, resulting in the gradual disappearance of the edges and corners of the anatase nanosheets. The exposure percentage of the (001) facets of ultrathin anatase nanosheets synthesized for 2 h at 180–200 °C are close to 100%. The microsphere whose surface is completely covered by these anatase nanosheets also has nearly 100% exposed (001) facets. This new anatase nanosheet-based self-assembled microsphere will have great application potential in pollution prevention, environmental protection, and energy fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
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