APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yihai Zhou,Pin Song,Meng Pan,Hong Wang,Zhongying Liu,Jun Di,Daobin Liu,Jingxiang Low,Renchun Yang
Photocatalytic H 2 evolution from water splitting in liquid–solid two-phase requires an efficient photocatalyst with excellent ability of charge separation and reactant molecular diffusion. In this study, the super hydrophilic-electrons acceptor with abundant –C=O and –OH functional groups were evenly grafted onto rutile TiO 2 nanorods surface to speed up the charge separation and water molecular diffusion, respectively. The photocatalytic results showed that the TiO 2 -CA grafted by citric acid (with three –C=O, three carboxy-(–OH) and one alcohol-(–OH)) presented a 1.48° contact angle and a distinct increased H 2 -production activity (48.5 mmol·h −1 ·g −1 ), whereas the TiO 2 -PA grafted by propane-1,2,3-tricarboxylic acid (Just lack of one alcohol-(–OH) compared with TiO 2 -CA) showed a 30.95° contact angle and a decreased H 2 -production activity (19.3 mmol·h −1 ·g −1 ) compared to the unmodified TiO 2 (25.8 mmol·h −1 ·g −1 ), indicating that the super hydrophilic-electrons acceptor is vitally important to the photocatalytic activity of TiO 2 . Based on the present results, the carbonyl group (–C=O) possess a stronger reducing capability and act as “electrons acceptor”, while the only alcohol-hydroxyl group (–OH) in TiO 2 -CA can decrease the mass transfer resistance and serve as “super hydrophilic absorber”. Considering its mild preparation, inexpensive cost, and admirable efficiency, the super hydrophilic-electrons acceptor with dual functional groups regulated TiO 2 can become a promising way for potential application in photocatalytic field.
研究领域:
材料科学
·
化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Enda Zhao,Jianyu Hao,Xian Xue,Mingming Si,Jing Guo,Hong Wang
In this work, a sintering route named cold sintering assisted two step sintering process (CSP-TS) is presented to prepare rutile TiO 2 ceramics with submicron grain sizes. Cold sintering process at 300 °C with tetrabutyl titanate and water as the liquid phase yields a ‘green body’ with a relatively high density of ∼80 %, and finally dense (98.5–99.8 %) rutile TiO 2 ceramics with grain sizes of ∼600 nm can be obtained in the second sintering process at 950−1000 °C. The microstructural analysis with SEM and TEM indicates that the CSP-TS samples sintered at 950 °C have an obvious phenomenon of recrystallization, accompanying by a decrease of amorphous phases and a formation of clear grain boundaries. Besides, the rutile TiO 2 ceramics prepared by CSP-TS possess excellent microwave dielectric properties with relative permittivity of 92.0–98.4 and Q × f values of 27,800−31,900 GHz. Therefore, it is feasible to utilize CSP-TS to prepare ceramics with small grain sizes at low sintering temperatures .
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Mingxuan Sun,Yalin Fang,Ying Wang,Shanfu Sun,Jia He,Zhi Yan
A ternary composite of Cu 2 O, graphene and rutile TiO 2 nanorods was prepared using Cu(CH 3 COO) 2 ·H 2 O, graphene oxide and TiCl 4 as the starting materials and its enhanced photocatalytic performance was demonstrated. Graphene/TiO 2 nanorod composites (GT) were obtained by a simple hydrothermal method and then, Cu 2 O was coupled onto the surface of graphene/rutile TiO 2 to form Cu 2 O/graphene/rutile TiO 2 nanorod (CGT) composites via a chemical bath deposition process. The as-prepared sample was characterized by X-ray diffraction (XRD), emission field scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), specific surface area analyzer (BET), Raman spectroscopy and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). It is found that the introduction of graphene and Cu 2 O has little effect on the morphology of TiO 2 nanorods with average dimensions of 140 nm (length) × 30 nm (diameter) (L/D ratio ≈5). A red shift of light absorption edge and more absorption in the visible light region were observed for the resulted ternary samples compared with TiO 2 and graphene/TiO 2 composites. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light irradiation, which showed 2.8 times corresponding enhancement of the degradation efficiency for the ternary composites compared with TiO 2 . This work provides a new strategy to improve the visible light response of TiO 2 and facilitate its application in environmental remediation.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiajun Li,Shishuang Zhang,Yan Xiang,Qiuyi Lu,Lei Xie,Hongbo Zeng
The distribution and mobility of rutile nanoparticles in natural environments are profoundly affected by the ubiquitous presence of humic acid (HA), and their interaction promotes the co-transport of heavy metals and organic pollutants, thereby increasing their environmental risk and potential exposure. A quantitative understanding of facet-specific adsorption mechanisms of HA on rutile surfaces is of vital significance but remains elusive. Herein, we quantified the intermolecular interactions between HA and different rutile crystal facets at nano- and atomic scales. HA adsorption exhibited a significant facet-dependent trend: (001) > (110) > (100). Based on atomic force microscope force measurements, the anisotropic adsorption was indicated by HA-rutile interactions, with adhesion energies of ~0.302 mJ/m 2 for (100), ~0.573 mJ/m 2 for (110), and ~1.942 mJ/m 2 for (001). Molecular dynamics further evidenced HA exhibited the strongest Ti-O coordination and hydrogen bond-mediated adsorption on (001) facet, forming a dense interfacial layer with the lowest diffusivity. Moreover, Ti-O coordination energies for representative bidentate ligands were calculated as −154.4, −132.8, and −118.7 kcal/mol on (001), (110), and (100) facets, respectively, based on density functional theory, much higher than hydrogen bonding. Therefore, HA adsorption anisotropy is mainly governed by Ti-O complexation, with hydrogen bonding playing a complementary role. This work provides nano/atom-scale insights into quantitative interactions between HA and rutile crystal facets, advancing the understanding of NOM-mineral interfacial processes in aqueous environment.
研究领域:
环境化学
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纳米地球科学
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表面科学
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分子模拟
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胶体与界面化学
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DOI
高影响因子
ChemCatChem
·
2026
·Vol. 18
·期 4
·e01814
·
IF 4.1
Liantong Guo,Zhaolin Dou,Jingxuan Yang,Min Wang
Biomethane production from renewable biomass faces significant challenges through conventional anaerobic digestion or thermochemical processes. While recent advances in mild hydrogenolysis of lignocellulose show promise, the conversion of lipid-rich feedstocks (e.g., waste cooking oil) into methane remains unexplored due to their stable C‒C bonds. Herein, we demonstrate a ruthenium (Ru) catalyst supported on rutile-phase TiO 2 that enables direct hydrogenolysis of triglycerides into methane. Under optimized conditions (300 °C, 1 MPa H 2 ), the Ru/TiO 2 -R system achieves 91%–99% methane yield from various fatty acids/esters, including unrefined waste cooking oil. The catalyst exhibits exceptional stability over multiple reaction cycles. This work establishes the first viable route for converting waste lipids into biomethane, potentially expanding renewable methane production capacity by ∼40% through utilization of global waste oil resources (500 million tons annually). The technology offers dual environmental benefits by simultaneously addressing organic waste management and clean energy production.
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.4
Ting Li,Xiaofei Zhang,Hongli Yang,Panpan Chang,Jiaqiang Yang,Jinshi Dong
TiO 2 was widely applied in fields such as catalysis, coatings, and cosmetics due to its excellent properties. Anatase and rutile were the two common phases of TiO 2 , and although their structures and phase transition were extensively studied, a consensus had not been reached. In this work, we investigated the structural evolution during the thermal-driven transformation of anatase to rutile from a microscopic perspective. It was demonstrated that the thermally induced anatase-to-rutile transition was not influenced by the environmental atmosphere. First, the Rietveld method was employed to determine the unit cell structures of the prepared anatase and the transformed rutile. Their stability was further confirmed through density functional theory (DFT) calculations and Ab initio molecular dynamics (AIMD) simulations. Based on the orientation relationship of (112) A || (010) R between the two phases, an atomic move pathway for the phase transformation was proposed. Finally, the phase transition of spherical particles was simulated by analyzing the variation of O-Ti-O bond angles in the TiO 2 structure. The sintering processes at different-size particles were also simulated with the calculations of centroid shrinkage ratio. This work clarified the structure and phase transition mechanism of TiO 2 at the atomic scale, which contributed to understanding and regulating the synthesis of TiO 2 -based materials.
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DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Cheng-Long Yu,Hang Liu,Jie Song,Jing Yang,Peng-Cheng Zhang,Fang-Lin Guo,Lin Hong,Huai-Bing Hui
We have reported for the first time the synthesis of mixed anatase and rutile TiO 2 under 27 MPa in water at the temperature as low as 375 °C. XRD patterns show that the content of rutile in the mixed phase TiO 2 is increased by 47.7% compared with the raw TiO 2 . The average particle size of the mixed phase TiO 2 is increased obviously compared with the raw TiO 2 . Compared with that of the raw TiO 2 , the band gap of the mixed phase TiO 2 is reduced to 2.94 eV while the absorbance is enhanced. Although the particle size increases, the mixed phase TiO 2 still exhibits better photocatalytic performance.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
光催化
·
固体化学
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DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 24
·12150-12155
·
IF 6.233
Shunxing Li,Jie Chen,Fengying Zheng,Yancai Li,Fuying Huang
A novel double-shell TiO2 hollow sphere with an inner anatase shell and an outer rutile shell was synthesized by a simple sol–gel method and silica protected calcination process. The structure and formation mechanism was proposed based on characterization using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The double-shell spheres have a uniform diameter of 360 nm and a typical yolk–shell structure. Moreover, the double-shell TiO2 hollow spheres possess a large specific surface area (169 m2 g−1). Due to the high surface area, multiple light reflection and beneficial electron conduction between the inner anatase and outer rutile shell of this special structure, the as-prepared double-shell TiO2 catalysts show remarkably enhanced photoactivity compared to the commercial P25 catalyst. In particular, rhodamine B molecules can be completely decomposed in the presence of the double-shell spheres after 60 minutes of irradiation with UV light. In addition, the high activity is retained after five cycles, indicating the stability and reusability of the double-shell catalyst.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Mohammadreza Rostami,Biao Yang,Xiaochuan Ma,Sifan You,Jin Zhou,Meng Zhang,Xuefeng Cui,Haiming Zhang,Francesco Allegretti,Bing Wang,Lifeng Chi,Johannes Barth
n-Armchair graphene nanoribbons (nAGNRs) are promising components for next-generation nanoelectronics due to their controllable band gap, which depends on their width and edge structure. Using non-metal surfaces for fabricating nAGNRs gives access to reliable information on their electronic properties. We investigated the influence of light and iron adatoms on the debromination of 4,4”-dibromo-p-terphenyl precursors affording poly(para-phenylene) (PPP as the narrowest GNR) wires through the Ullmann coupling reaction on a rutile TiO2(110) surface, which we studied by scanning tunneling microscopy and X-ray photoemission spectroscopy. The temperature threshold for bromine bond cleavage and desorption is reduced upon exposure to UV light (240-395 nm wavelength), but the reaction yield could not be improved. However, in the presence of codeposited iron adatoms, precursor debromination occurred even at 77 K, allowing for Ullmann coupling and PPP wire formation at 300-400 K, i.e., markedly lower temperatures compared to the conditions without iron adatoms. Furthermore, scanning tunneling spectroscopy data reveal that adsorbed PPP wires feature a band gap of ≈ 3.1 eV.
研究领域:
材料科学
·
表面化学
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DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Shiman Zhu,Liuyi Ren,Shenxu Bao,Yimin Zhang,Bo Chen
The flotation separation of fine minerals, including rutile, has long been a challenging research focus. This study selected rutile and garnet samples with size fractions of −15, −38, and −74 μm to investigate the impact of particle size on flotation separation. Infrared spectroscopy, Zeta potential analysis, adsorption capacity measurements, and high-speed camera were utilized to analyze the mechanism. Results indicate that a high-grade concentrate with recovery of 92.33 % was achieved by mixing −74 μm rutile and −15 μm garnet in a 1:1 ratio. Benzohydroxamic acid (BHA) collector primarily chemisorbs onto the surface of rutile particles. BHA's adsorption capacity on each particle size's rutile surface is significantly higher than that of garnet. Meanwhile, sodium fluorosilicate (SSF) exhibits the strongest inhibitory effect on −15 μm garnet particles. Additionally, adhesion between bubbles and −74 μm rutile is much stronger than that between bubbles and fine particles overall. These findings have significant reference value for improving eclogite-type rutile ore's fine particle separation.
研究领域:
矿物加工工程
·
材料科学与工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yixi Wang,Wenqing Xu,Xueyan Chen,Chaoqun Li,Jun Xie,Yang Yang,Tingyu Zhu,Changbin Zhang
Gaseous ammonia (NH 3 ) in the atmosphere is potentially harmful to both human health and the environment. The selective catalytic oxidation of NH 3 (termed as NH 3 –SCO) into N 2 and H 2 O is a promising method for decreasing NH 3 emissions. A highly efficient catalyst is required for controlling NH 3 emissions by this method in practice. In this study, we prepared Ir/TiO 2 catalysts using different crystal structures of TiO 2 (rutile, P25 or anatase) as supports by a simple impregnation method and evaluated their performance in the NH 3 –SCO. We found that the Ir/TiO 2 –R (rutile) catalyst performed better than the Ir/TiO 2 –P25 (mixed–phase) and Ir/TiO 2 –A (anatase) catalyst. High–angle annular dark–field images of the aberration–corrected scanning transmission electron microscopy revealed that the Ir species were mainly atomically dispersed on the TiO 2 support in Ir/TiO 2 –R with 1 wt% Ir loading, whereas the Ir species agglomerated to form clusters or nanoparticles in Ir/TiO 2 –P25 and Ir/TiO 2 –A. The combined results of X–ray absorption fine structure, H 2 –temperature–programmed reduction, and in situ diffuse reflectance for infrared Fourier Transform spectroscopy studies suggested that atomically dispersed Ir species had stronger electronic metal–support interaction with rutile TiO 2 , which resulted in easier to adsorb and activate O 2 at the interface and thus, better low–temperature activity of the Ir/TiO 2 –R catalyst.
研究领域:
环境科学
·
催化化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Shu Sheng Pan,Wei Lu,Yi Hua Zhao,Wei Tong,Ming Li,Li Min Jin,Jin Yuk Choi,Fei Qi,Shi Guo Chen,Lin Feng Fei,Siu Fung Yu
Detection of H2O2 is important for the applications in environmental protection, pharmaceutical industries, food production, and clinical control. Current colorimetric assay of H2O2 based on enzyme or nanomaterials always needs TMB or other peroxidase substrate as coloration species. Furthermore, the corresponding response time including incubation process is in order of minute. In this study, we report on the synthesis of heavily Ti3+-doped TiO2 composed of spherelike nanoparticles by pulsed laser ablation method. This TiO2 can directly detect H2O2 without using TMB or any other peroxidase substrate and is free from incubation process. In addition, the detection sensitivity is compatible with or better than that of the natural enzyme or other nanomaterials. Hence, the self-doped TiO2 nanoparticles provide a novel, direct, ultrafast approach for H2O2 assay application.
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DOI
高影响因子
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