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
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Yanfeng Cao,Xiaoting Li,Zhenfeng Bian,Addis Fuhr,Dieqing Zhang,Jian Zhu
A facile solvothermal approach was used to prepare brookite-type TiO 2 nanocrystals with different phase content and structure, accomplished by adjusting the ratio of TiCl 4 to t -BuOH. The obtained biphasic brookite/rutile TiO 2 nanocrystals showed a high brookite weight content (72%). The photocatalytic degradation of phenol under UV-irradiation was used to determine the synergetic effect from the combination of different phases ( e.g. , brookite, anatase, and rutile). The biphasic NST-4 composed of brookite and rutile exhibited the highest degradation rates, with rate constants three times higher than commercial Degussa P-25. Detailed analysis found that, besides phase composition and content, the semi-embedded structure was essential to obtain a superior activity of biphasic TiO 2 samples.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yubin Sun,Shuming Wen,Qicheng Feng,Yanyu Tang,Yongchao Miao,Xu Wang,Zhihao Shen
This work explored the application of sodium lauroyl sarcosinate (SLAS) as a green surfactant in rutile flotation systems. A detailed examination of the flotation behavior and adsorption characteristics of rutile was conducted, particularly under Pb 2+ ion-modified conditions. The experimental methodology incorporated multiple analytical techniques: micro-flotation experiments, surface potential analysis, adsorption quantification, FTIR spectroscopy, SEM-EDS characterization, XPS surface analysis, and computational DFT simulations. Micro-flotation experiments demonstrated that under the optimal conditions (SLAS concentration of 2.8 × 10 −4 mol/L, pH 3), a rutile recovery of 81.49 % was obtained. Notably, as the pH increased, the recovery of rutile exhibited a decreasing trend. Following Pb 2+ modification (8.0 × 10 −5 mol/L) combined with SLAS treatment (2.8 × 10 −4 mol/L), the rutile demonstrated consistent flotation recovery exceeding 90.02 % across a broad pH range (3 ∼ 7). The adsorption capacity experiments and SEM-EDS results indicated that multiple SLAS layers were adsorbed on the rutile. Moreover, Pb 2+ modification improved the favorability of SLAS adsorption. A combination of surface potential measurements and infrared spectroscopy confirmed the chemical adsorption mechanism of SLAS on positively charged rutile surface atoms. XPS characterization confirmed that the SLAS oxygen atoms chemically bonded with the rutile surface Ti/Pb atoms. DFT simulations demonstrated that the adsorption processes were spontaneous, with Pb 2+ and SLAS respectively, forming O − Pb and Ti − O bonds on the (110) surface. This mechanism explains how Pb 2+ enhances the SLAS adsorption capacity and subsequent flotation efficiency of the rutile. These studies proved the industrial potential of environmentally friendly collector SLAs in rutile flotation.
研究领域:
矿物加工工程
·
表面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Siyu Gong,Ting Zhang,Bingguo Liu,Peng Liu,Yifan Niu,Zhenxing Yang,Yuhao Jin,Wang Chen,Guangxiong Ji,Shenghui Guo,Libo Zhang
The study introduces a microwave-assisted rutile seed crystal (RS) method to synthesise mixed-phase TiO 2 nanoparticles, controlling the rutile TiO 2 (TiO 2 -R) phase content ( γ R ) from 33.0 % to 99.3 % by adjusting the doping level of RS to 20.0 wt% in the metatitanic acid (MA). The sample, designated as MA-20, with the highest oxygen vacancy (O v ) concentration of 38.56 %, demonstrated over 99 % microwave absorption (minimum reflection loss ( R L ) −56.8 dB) and a heating rate of 0.836 °C/s under 2000 W and 20 g. RS enhanced the dielectric property of MA, facilitating phase transition from anatase TiO 2 (TiO 2 -A) to TiO 2 -R above 600 °C, with critical temperatures between 800 and 1000 °C. MA-20, with a surface area of 1.9226 m 2 /g and pore size distribution of 9.0851 nm, showed that higher RS doping levels promoted phase transition and grain growth, thereby enhancing the crystallinity and charge transfer efficiency. More than 50 % of MA-20 particles were under 10 nm, and 94 % were below 100 nm, confirming the synthesis of TiO 2 nanomaterials. MA-20 exhibited excellent electromagnetic wave storage and conversion properties. Adjusting microwave parameters and RS levels controls γ R , offering an efficient approach for preparing mixed phase TiO 2 catalysts, essential for semiconductor photocatalysis and overcoming TiO 2 -A limitations.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Hong Wang,Zhongying Liu,Yihai Zhou,Renchun Yang
In this paper, P O was grafted on the surface of rutile TiO 2 by one-step hydrothermal method . Due to the presence of the highly electronegative oxygen element, the surface of TiO 2 often presented an electron-deficient state, which limited its application in reduction reactions. Herein, the low electronegativity element P from the phosphate was grafted on the surface of TiO 2 to form a P O structure, which changes the electronic equilibrium state of the TiO 2 and provide a new channel for electron migration. The surface of TiO 2 presented an electron-enrich structure, which promoted the best hydrogen production performance around 28 mmol·g −1 ·h −1 on TiO 2 -P-0.01.
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2015
·
IF 6.025
Kui Cheng,Yu Sun,Hongping Wan,Xiaozhao Wang,Wenjian Weng,Jun Lin,Huiming Wang
Anatase TiO 2 nanodot films have been found to be able to release cells under light illumination with excellent efficiency and safety. In the present study, we investigated the effects of rutile contents in TiO 2 nanodot films on such light induced cell detachment behavior. The results showed that TiO 2 nanodot films with different contents of rutile phase have been prepared successfully. The content of rutile phase increased with the increase in calcination temperature. All films possessed good cell adhesion but there was a decrease in cell proliferation with the increasing content of rutile phase. Single cell detachment assay showed that the films with high rutile contents (calcined at 900 °C and 1100 °C) showed better cell detachment performance. That was ascribed to the changes of the secondary structure of extracellular proteins adsorbed on the nanodot surface after ultraviolet (365 nm, UV365) illumination. In addition, cell sheets detached through UV365 illumination maintained high activity and could be further used in tissue engineering. The present work showed that the existence of rutile phase is helpful in cell detachment behavior and it could be utilized to optimize light-induced cell detachment behavior. Statement of Significance This work discovers that the presence of rutile phase in TiO 2 nanodot films could improve the light-induced cell detachment behavior, although rutile phase is inferior to anatase phase on light induced superhydrophilicity. That strongly supported that the behaviors of adsorbed proteins are crucial in acquiring cell sheet with light illumination. In fact, the state and behavior of adsorbed protein greatly affect the interaction between biomaterials and living cells. Therefore, we consider this work is not only important in harvesting cells or cell sheets through light illumination, but also helpful in further understanding of interaction between biomaterials and cells.
研究领域:
生物材料学
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细胞生物学
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组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 9
·955
·
IF 4.501
Beilei Cui,Hua Wang,Qingfeng Ge,Xinli Zhu
A series of rutile TiO2-supported Ni catalysts with varying Ni sizes were prepared and reduced at 650 °C to explore the effect of Ni size on the strong metal–support interactions (SMSI) and its consequences on the hydrodeoxygenation (HDO) of m-cresol at 350 °C and atmospheric pressure. When the Ni size increases from 4 to 29.1 nm, the SMSI becomes stronger, e.g., the thickness of the TiOxoverlayer and the coverage extent of TiOxon the Ni particle surface increase. Direct deoxygenation to toluene is the dominant pathway on Ni/TiO2catalysts with varying Ni loadings, with almost no CH4being formed. These results indicate that the TiOxoverlayer significantly alters the property of Ni. That is, the C-C hydrogenolysis activity on bare Ni is completely inhibited due to SMSI, while the deoxygenation activity is improved at the Ni-TiOxinterfacial perimeter sites. Meanwhile, the turnover frequency of HDO on small Ni particles of 4 nm is > 2 times higher than that on large Ni particles of 29.1 nm, indicating that the small Ni particle with moderate SMSI appears to be optimal for the direct deoxygenation of m-cresol to toluene. The results suggest HDO activity may be enhanced by tuning the metal particle size and SMSI degree.Keywords:Ni/TiO2;rutile;strong metal-support interactions;m-cresol;hydrodeoxygenation
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 10
·865
·
IF 5.743
Yuting Qiao,Xianrong Liu,Zhi Jia,Peng Zhang,Li Gao,Bingxin Liu,Lijuan Qiao,Lei Zhang
Abnormal protein phosphorylation may relate to diseases such as Alzheimer’s, schizophrenia, and Parkinson’s. Therefore, the real-time detection of phosphoproteins in sweat was of great significance for the early knowledge, detection, and treatment of neurological diseases. In this work, anatase/rutile TiO2was in situ grown on the MXene surface to constructing the intercalation structure MXene@anatase/rutile TiO2ternary heterostructure as a sensing platform for detecting phosphoprotein in sweat. Here, the intercalation structure of MXene acted as electron and diffusion channels for phosphoproteins. The in situ grown anatase/rutile TiO2with n-n-type heterostructure provided specific adsorption sites for the phosphoproteins. The determination of phosphoprotein covered concentrations in sweat, with linear range from 0.01 to 1 mg/mL, along with a low LOD of 1.52 μM. It is worth noting that, since the macromolecular phosphoprotein was adsorbed on the surface of the material, the electrochemical signal gradually decreased with the increase of phosphoprotein concentration. In addition, the active sites in the MXene@anatase/rutile TiO2ternary heterojunction and synergistic effect of the heterojunction were verified by first-principle calculations to further realize the response to phosphoproteins. Additionally, the effective diffusion capacity and mobility of phosphoprotein molecules in the ternary heterojunction structure were studied by molecular dynamics simulation. Furthermore, the constructed sensing platform showed high selectivity, repeatability, reproducibility, and stability, and this newly developed sensor can detect for phosphoprotein in actual sweat samples. This satisfactory sensing strategy could be promoted to realize the noninvasive and continuous detection of sweat.Keywords:sweat;phosphoprotein;MXene;anatae/rutile TiO2;intercalation structure;healthcare monitoring
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
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
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Qun Liu,Yangdong Zhang,Xingyu Chen,Chunlin Zhao,Xiao Wu,Tengfei Lin,Zedong Xu,Min Gao,Cong Lin
TiO 2 is a promising photoelectrochemical (PEC) material as photoanodes for photoelectric conversion. However, severe charge recombination issues in TiO 2 significantly hinder the PEC efficiency and thus its application. It has been reported that the construction of rutile/anatase (R/A) heterophase junctions benefits fast charge transfer via interfaces and improves the efficiency of conversion. However, the evolution of R and/or A phases and their morphology and phase-transition effect on the PEC properties have not been investigated. In this study, unique TiO 2 heterophase junctions consisting of R-phase nanorods on the titanate-coexisting-phase (CO-phase) truncated octahedral particles were fabricated through a two-step hydrothermal method, where the morphology and phase transition of a titanate-coexisting phase was meticulously controlled and carefully monitored. The heterophase junctions exhibited superior PEC performances with a photocurrent density of 1.62 ± 0.05 mA cm −2 at 1.23 V, which was 4.3 times and 1.6 times greater than that of pure R phase and R-nanorod/A-nanosheet, respectively. This work demonstrates the potential of morphology engineering and phase transition of photoanodes for highly efficient photoelectric conversion.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
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
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Longfu Dai,Jian Liu,Deqiang Luo,Runpeng Liao,Da Li
In this paper, an eco-friendly surfactant sodium lauroamphoacetate(LMAC) was firstly studied as a collector for rutile flotation. The role and adsorption mechanism of LMAC on rutile surface was fully investigated by micro-flotation tests, zeta potential tests, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and the density functional theory (DFT) calculation. The result of micro-flotation tests showed that the flotation recovery of rutile with 120 mg/L LMAC treatment is stable at around 92 % in pH=7. Under the condition of the same collector amount, LMAC has a stronger collecting capacity for rutile than styrene phosphonic acid (SPA), benzohydroxamic acid (BHA) and sodium oleate (NaOL) in acidic and neutral pulp condition. And the effective flotation separation of rutile and quartz was accomplished at pH=7 by employing inhibitor modified water glass and the collector LMAC. Zeta potential tests and FTIR analysis demonstrated that LMAC could chemically adsorb onto the positively charged atoms of rutile surface. XPS analysis further confirmed that Ti atoms on the surface of rutile reacted with O atoms in LMAC during the adsorption process. DFT calculation results directly show that the adsorption process of LMAC on rutile (1 1 0) surface is spontaneous, and forms two Ti − O bonds and a H−O bond. Mulliken population analysis and differential charge density analysis showed that during the adsorption process, electrons were transferred between the O atoms of LMAC and the Ti atoms on the rutile surface, forming the new Ti − O bonds.
研究领域:
矿物加工工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）