CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Jinghang Li,Huimin Zang,Shun Yao,Zicheng Li,Hang Song
In recent years, ionic liquids (ILs) have been widely used in extraction, synthesis, electrochemistry and other fields. Meanwhile, the environmental impact of ILs has been attracting a lot of attention, and eco-friendly treatment for ILs is becoming a necessary subject. In this study, photocatalytic degradations of benzothiazole ILs catalyzed by titanium dioxide (TiO 2 ) and silver-loaded titanium dioxide (Ag/TiO 2 ) were studied for the first time. The degradation of benzothiazole hexafluorophosphate ([C 4 Bth]PF 6 ) could reach more than 99% within 240 min with the catalysis of TiO 2 . To improve catalytic efficiency, Ag/TiO 2 was synthesized and characterized by UV–Vis diffuse reflectance absorption spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The degradation of [C 4 Bth]PF 6 could reach more than 99% within 120 min in the degradation catalyzed by Ag/TiO 2 . The photodegradation products of benzothiazole ILs are composed of inorganic substances or organic substances with simpler structures, which are easier to decompose and less toxic. The degradation system proposed by this study could provide a simple, green, safe, and economical method for the efficient treatment of benzothiazole ILs.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 8
·7061
·
IF 5.6
Jing Xin,Jing Wang,Yuanping Yao,Sijia Wang,Zhenxi Zhang,Cuiping Yao
Simulated-daylight photodynamic therapy (SD-PDT) may be an efficacious strategy for treating melanoma because it can overcome the severe stinging pain, erythema, and edema experienced during conventional PDT. However, the poor daylight response of existing common photosensitizers leads to unsatisfactory anti-tumor therapeutic effects and limits the development of daylight PDT. Hence, in this study, we utilized Ag nanoparticles to adjust the daylight response of TiO2, acquire efficient photochemical activity, and then enhance the anti-tumor therapeutic effect of SD-PDT on melanoma. The synthesized Ag-doped TiO2showed an optimal enhanced effect compared to Ag-core TiO2. Doping Ag into TiO2produced a new shallow acceptor impurity level in the energy band structure, which expanded optical absorption in the range of 400–800 nm, and finally improved the photodamage effect of TiO2under SD irradiation. Plasmonic near-field distributions were enhanced due to the high refractive index of TiO2at the Ag-TiO2interface, and then the amount of light captured by TiO2was increased to induce the enhanced SD-PDT effect of Ag-core TiO2. Hence, Ag could effectively improve the photochemical activity and SD-PDT effect of TiO2through the change in the energy band structure. Generally, Ag-doped TiO2is a promising photosensitizer agent for treating melanoma via SD-PDT.Keywords:melanoma;simulated-daylight photodynamic therapy;Ag-doped TiO2;Ag-core TiO2
研究领域:
肿瘤学
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材料科学
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光动力治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Jian PANG,Ling-xin KONG,Li-guo ZHU,Bao-qiang XU,Jun-jie XU,Chong-lin BAI,Bin YANG
A new method for the preparation of low oxygen titanium was proposed by the direct reduction of TiO 2 with Mg produced by MgCl 2 −KCl−YCl 3 molten salt electrolysis. The Mg−Ti−O phase diagram indicates that it is feasible to reduce TiO 2 using Mg, and the Φ − p O2− diagrams indicate that deep deoxidation of titanium in molten MgCl 2 −YCl 3 is also feasible. The experimental study on the reduction of TiO 2 was carried out in MgCl 2 −YCl 3 and MgCl 2 −YCl 3 −KCl molten salts. The results showed that the O 2− from the reduction and deoxygenation was removed using YOCl precipitation and CO x gas production and TiO 2 can be reduced to titanium peroxide (Ti 6 O) by electrochemical reduction at 1073−1173 K and 2.5−3.1 V. The high-oxygen titanium was electrochemically deoxidized in the molten salt of MgCl 2 −YCl 3 at a temperature of 1173 K at different voltages. Moreover, it was observed that it is possible to reduce the high oxygen content of titanium from 1200×10 −6 to less than 100×10 −6 oxygen.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2016
·
IF 9.307
Xianwei Wang,Nobutaka Maeda,Alfons Baiker
Promotion of Au/TiO2 by FeOx addition is shown to result in a very strong enhancement of activity and selectivity in the NO reduction with CO. The nanocomposite Au-FeOx/TiO2 catalysts were prepared by deposition–precipitation (Au/TiO2) and subsequent impregnation (FeOx). Structural characterization of the nanocomposite catalysts using XRD, TEM, TPR, XPS, and DRIFTS revealed that they consist of titania-supported Au particles of about 4.4–4.8 nm size, which were partially covered with a thin layer of FeOx,, mainly made up of Fe2+ (FeO), in addition to a small fraction of Fe3+ (Fe2O3). In situ DRIFTS studies showed that, in comparison to Au/TiO2, on the Au-FeOx/TiO2 nanocomposites new adsorption sites were created, which led to enrichment of CO and NO molecules on the Au surface and at its interfaces with FeOx and TiO2. At the reaction temperature (250 °C), a new surface NO–CO complex, where both Fe and Au are proposed to be involved in the adsorptive interaction, was discovered. The titania-supported Au-FeOx nanocomposites considerably facilitated the formation of this complex and contributed to the striking enhancement of the catalytic performance (activity and selectivity) of the Au-based catalyst.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 21
·18059-18066
·
IF 2.324
Li Zhen,Yu Libo,Song Hai,Feng Lei,Wang Xingpeng
TiO 2 nanoparticles (NP) at top of TiO 2 nanotube (TiO 2 NP@TiO 2 NT) double-layered architecture is constructed to combine the advantages of TiO 2 NP and TiO 2 NT together. This composite TiO 2 NP@TiO 2 NT architecture as photoanode possesses a larger surface area for more QDs loading, and highly tubular structure for electron swift transport. Based on this architecture, CdSe/CdS quantum dots (QDs) have been successfully synthesized by successive ionic layer adsorption reaction (SILAR) method for quantum dots-sensitized solar cell application. The photovoltaic performance of QDSSCs based on TiO 2 NP@TiO 2 NT have been investigated in contrast with bare TiO 2 NP and bare TiO 2 NT architectures with almost the same thickness. The results show that the power conversion efficiency (PCE) of QDSSCs could be enhanced using TiO 2 NP@TiO 2 NT and improved to 3.26%, which is 80% and 38% higher than QDSSCs based on bare TiO 2 NT and bare TiO 2 NP, respectively. The BET surface area, UV–vis absorption spectra, and incident photon to current conversion efficiency (IPCE) measurements results show the evidence that the TiO 2 NP@TiO 2 NT can combine advantages of TiO 2 NP and TiO 2 NT structures together and lead to a higher light harvesting efficiency, electron collecting efficiency, and efficient electron transport.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Li Fang,Leixin Hou,Yuhao Zhang,Yongkang Wang,Guanghong Yan
Highly hydrophobic rutile titania-silica nanocomposites were synthesized by an improved hydrolysis co-precipitation method using low-cost sodium metasilicate and titanium oxysulfate (TiOSO 4 ) as precursors, followed sequentially by calcination at 800 °C and modification with trimethylchlorosilane (TMCS). It was found that the resulting TiO 2 -SiO 2 nanocomposites had a Ti/Si molar ratio of 5:1 and exhibited single-phase rutile with a specific surface area of 269 m 2 g −1 . The addition of acetylacetone (AcAc) during the hydrolysis co-precipitation process played a key role in the growth of well-ordered TiO 2 -SiO 2 crystallites since the hydrolysis rate of TiOSO 4 might be retarded due to the complexation of AcAc to the Ti atoms in TiOSO 4 . The TMCS-modified TiO 2 -SiO 2 nanocomposites exhibited a high root-mean-square (RMS) roughness of 22 nm and good hydrophobicity with a static contact angle of 143.7°, highlighting its potential application as a filler in exterior wall coatings.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2013
·Vol. 5
·期 10
·3114-3123
·
IF 5.181
Jinze Lyu,Lizhong Zhu,Clemens Burda
Graphical Fight pollution! A comparison of the adsorption and photodegradation of gas phase toluene under realistic indoor air purification conditions with the nature of microporous amorphous TiO 2 and mesoporous anatase catalysts Adsorption and photodegradation are key steps in environmental air purification. Micropores have been introduced into anatase TiO 2 nanocatalysts to enhance the adsorption of pollutant molecules onto the photocatalyst surface, which increases the use of the photoinduced electron–hole pairs. Three nanocomposites have been synthesized with dodecylamine as a pore-forming agent under mild hydrothermal conditions and at varying temperature of preparation. Samples synthesized at 100, 115, and 130 °C, labeled TiO 2 -100, TiO 2 -115, and TiO 2 -130, respectively, provided insights into the effect of crystallinity and micropore area on the removal efficiency of gas-phase organic pollutants. Of the three, TiO 2 -100 had the largest micropore area (493 m 2 g −1 ) but amorphous phase. TiO 2 -130 had anatase phase but only mesopores, whereas TiO 2 -115 had both a relatively large micropore area (258 m 2 g −1 ) and an anatase crystal structure. Toluene was chosen as a model air pollutant. Experiments were performed in a single-pass reactor in the presence of UV irradiation under various experimental conditions, such as varying partial pressures of toluene, contact times, and relative humidities of the mobile gas phase, to approximate realistic conditions for this air purification system. Of the three prototype catalysts, TiO 2 -115 showed the highest removal and mineralization efficiencies owing to the optimized availability of photogenerated holes and adsorbed toluene. The key parameters for optimized photocatalysis of low-concentration air pollutants are the micropore area and the crystallinity of the photocatalyst.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zhan Wang,Xianjun Lang
Herein, we report an efficient protocol for the selective oxidation of amines with the sole involvement of conduction band electrons (e cb − ) of TiO 2 for both the activation of O 2 and the ensuing oxidation reaction. Visible light was harvested by dye molecules on the surface of TiO 2 , which injects electrons into its conduction band, generating dye radical cations. Charge transfers from dye radical cations to amines are relayed by the catalytic cycle of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) to TEMPO + , which is an oxidant that can conduct the direct two-electron oxidation of amines to imines. TEMPO was regenerated by the oxidation of TEMPOH with superoxide generated by the interaction of e cb − and O 2 . This work suggests that one can exploit the strategy of cooperative photocatalysis with each component performing in its optimal role: TiO 2 for O 2 activation, dye for visible light harvesting, and TEMPO for oxidative transformations.
研究领域:
化学
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 6
·1179-1183
·
IF 0.399
Zhang Kuibao,Wen Guanjun,Yin Dan,Zhang Haibin
TiO 2 was employed as the waste form for disposal of simulated nuclide Sr. Preparation of Sr bearing rutile was explored under different sintering temperatures and Sr contents. The optimal treatment temperature was confirmed as 1 300 °C for the incorporation of SrO in rutile TiO 2 . Perovskite type SrTiO 3 was prepared as the resultant product. The limited containment capacity of SrO in rutile was speculated to be 56.5wt%. As the SrO content increases, the as-synthesized sample exhibits more porosity because SrTiO 3 phase demonstrates higher density than rutile and SrO. The 28 day normalized leaching rate (LRi) of Sr and Ti will decrease congruously as the SrO incorporation increases. The LR Sr value is lower than 0.1 g·m -2 ·d -1 , which is about 3 orders of magnitude higher than the LR Ti value.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yixuan Wang,Fenghao Zhang,Song Chen,Akiyoshi Osaka,Weiyi Chen
Titania nanotube (NT) arrays have been widely used as cell-supporting matrices. However, cells are always seeded on the porous surface of the NT array and have very limited interactions with each individual NT in the array. In this study, titania hollow microtubes (HMTs) were synthesized via a gelatin-template sol-gel route and then utilized as free-standing cell-supporting matrices for the first time. The resultant titania HMTs were studied by field emission scanning electron microscopy, energy-dispersed spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. Each HMT was composed of rutile-type titania nanoparticles with diameters of 50–100 nm and a diameter of 50–100 µm. The results from a leaching liquor assay demonstrated good biocompatibility of titania HMTs. Each HMT has been demonstrated to independently support the adhesion and proliferation of osteoblast MC3T3-E1 cells. For comparison, titania NT arrays, not independent titania NT, only supported the adhesion of cells on their porous surface. Thus, the resultant titania HMTs are applicable to free-standing and biocompatible cell-supporting matrices.
研究领域:
材料科学
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生物材料
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细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 3
·1303-1314
·
IF 2.4
Lv Ningning,Qiu Yuchao,Hu Yiming,Shi Hangkai,Shi Junjie,Ding Xiang,Li Haolun
It has been proved that Cr 2 O 3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO 2 -TiO 2 system with the addition of 5 wt% Cr 2 O 3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr 2 O 3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr 2 O 3 addition by expanding the primary phase of perovskite toward higher SiO 2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database. Graphical Abstract
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 46
·期 2
·999-1004
·
IF 1.491
Huang Zhengfeng,Cheng Xudong,Dong Peimei,Zhang Xiwen
To mitigate the greenhouse effect, many studies have been carried out to improve the CO 2 conversion efficiency of TiO 2 . Modification of TiO 2 has been intensively investigated, but the influence of an electric field on photoreduction by this material remains largely unknown. Accordingly, in this study, we explored the effect of an electric field on the photoreduction process using a porous TiO 2 -Ti material. The results indicated that the CO yield improved 85-fold (equivalent to 4772 μ mol/g h) when a 30-kV voltage was applied during the reduction process. To make the electric field effect fully functional, we also explored the effect of water on the photoreduction process, finding that TiO 2 showed the highest conversion rate when the humidity was controlled at 50% relative humidity (RH).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）