Science of Advanced Materials
·
2019
·Vol. 11
·期 2
·166-177
·
IF 1.158
Cao Zhenhao,Li Wenting,Pang Juanjuan,Xu Jingjing,Jiao Yapei,Li Xue
Polyethyleneimine (PEI) modified PluronicF127 block copolymers (PEI-F127-PEI) were synthesized via a chemical reaction of isocyanate and hydroxyl group. By using PEI-F127-PEI block copolymers as templates combined with a sol–gel process, followed by evaporation-driven assembly
and calcination process, mesoporous TiO2 nanomaterials with different phase composition (rutile, anatase/rutile mixture, and anatase) and morphology were prepared. The prepared TiO2 samples were characterized by transmission electron microscopy (TEM), X-ray diffraction
(XRD), UV–vis diffuse reflectance spectrophotometry and N2 adsorption analysis. It is found that the mass ratio of TiCl4/PEI-F127-PEI and calcination temperature have an important influence on the phase composition and morphology of TiO2. Compared to
reported values, the transformation temperature from anatase to rutile decrease. When the mass ratio of TiCl4/PEI-F127-PEI is 2.0/1, the prepared sample exhibits the highest photocatalytic activity for the degradation of methylene blue (MB) under UV light irradiation, indicating
that the mixed anatase/rutile phase TiO2 is an efficient photodegradation catalyst of MB pollutant in wastewater treatment.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Changwang Shao,Guowei Zhou,Zhaocheng Li,Yue Wu,Delan Xu,Bin Sun
Large-diameter tube-like mesoporous TiO 2 nanotubes were synthesized via homogeneous precipitation from aqueous solutions containing titanium oxysulfate (TiOSO 4 ) using urea. The cationic surfactant cetyltrimethylammonium bromide was used as a structure-directing agent. Prepared samples were characterized by X-ray diffraction, transmission electron microscopy (TEM), field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and N 2 adsorption–desorption isotherms. Experimental results indicated that the samples exhibit tube-like structures with lengths of approximately 6 μm to 8 μm, large tube diameters of approximately 500 nm to 600 nm, and a wall thickness of approximately 450 nm. TEM images and N 2 adsorption–desorption isotherms showed that the tube walls of the samples have a uniform mesoporous structure. A possible mechanism for the formation of tube-like mesoporous TiO 2 was proposed. The photocatalytic activities of the large-diameter tube-like mesoporous TiO 2 were assessed via the photocatalytic decomposition of papermaking wastewater under ultraviolet light irradiation. The effects of different parameters such as UV light irradiation, catalyst dosage and solution pH on photocatalytic activities of tube-like mesoporous TiO 2 were studied. The as-synthesized tube-like TiO 2 showed higher photocatalytic activities than Degussa P25. MTS3 exhibited the highest photocatalytic activity. The chemical oxygen demand and chroma percent degradations of papermaking wastewater were approximately 73.0% and 99.5%, respectively, at MTS3 dosage of 1.0 g/L and pH value of 3.0 after 12 h of photodegradation.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Azhar Ali Haidry,Qawareer Fatima,Zhe Wang,Yucheng Wang,Yinwen Ji,Adil Raza
Owing to their unique surface adsorption characteristics, the controlled synthesis of highly ordered mesoporous materials with high adsorption traits is of utmost importance. In the present work, ordered mesoporous TiO 2 (OMT) with tunable channels was prepared via a facile soft-templet evaporation-induced self-assembly (EISA) method. The effect of phenol-formaldehyde resins (PF) and the ratio of triblock copolymer (F127) and tetrabutyl titanate (TBOT) on the OMT surface was studied by Brunauer Emmett Teller (BET) and scanning electron microscopy (SEM) analysis. The samples without PF resol did not offer any ordered mesoporous formation, while a highly ordered mesoporous structure was obtained for samples with PF resol. For the prepared samples, the specific surface area SSA∼141–254 m 2 /g, average pore size S P ∼5.3–9.8 nm and pore volume V P ∼0.29–0.45 cm 3 /g were obtained by controlling the ratio of F127 and TBOT. For 95% relative humidity (RH), the OMT with optimum specific surface area (SSA∼220 m 2 /g) and small pore size (S P ∼5.3 nm) showed a high response (S R ∼3.5 ×10 5 ), fast response time (26 s) and good long-term stability (over 90 days). Finally, the structure, morphology and chemical composition of the samples were determined by XRD , SEM, HRTEM , and XPS techniques to predict and authenticate the plausible sensing mechanism.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Kunlei Zhu,Qian Li,Zhongmeng Xue,Qi Yu,Xicheng Liu,Zhongqiang Shan,Kai Liu
High cost, low safety, and low capacity are critical factors limiting the wide application of lithium (Li) batteries in our daily life. TiO2 and LiMn2O4 are both advanced electrode materials with advantages of low cost and high safety. Although TiO2/LiMn2O4 full batteries have been reported by several groups, these batteries only deliver low areal capacities (<1 mA cm–2), which is far from the criterion of commercially available Li-ion batteries (at least 2 mA cm–2). Here, we report high-areal-capacity TiO2/LiMn2O4 full batteries using a configuration containing anodes of mesoporous TiO2 spheres and cathodes of LiMn2O4 nanorods. Specifically, mesoporous TiO2 spheres are prepared by an improved solvothermal method, and their electrochemical performance is investigated using Li/TiO2 half-batteries. Because of their high specific areas, abundant pores, and stable structures, the mesoporous TiO2 spheres demonstrate remarkable cycling performances: after a test period as long as ∼1000 h, they still deliver a capacity as high as 150 mAh g–1 beyond 500 cycles at 1 C (1 C = 170 mAh g–1). LiMn2O4 nanorods are fabricated using β-MnO2 nanorods as the precursor, and their electrochemical performances are studied using Li/LiMn2O4 half-batteries as well. Furthermore, we design TiO2-limited TiO2/LiMn2O4 full batteries and investigate their electrochemical performances. The mesoporous TiO2 sphere/LiMn2O4 nanorod full batteries exhibit areal capacities as high as ∼4 mA cm–2, which is much higher than the values of conventional TiO2/LiMn2O4 full batteries and comparable to those of commercially available Li-ion batteries. This work could make a substantial step toward the commercialization of TiO2/LiMn2O4-based full batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
SOLAR ENERGY
·
2020
·
IF 4.608
Deye Liu,Kunpeng Liu,Yueying Liu,Jihao Bai,Meng Dai,Fengmin Liu,Geyu Lu
A uniform CH 3 NH 3 PbI 3 layer was successfully deposited on a mesoporous TiO 2 layer (mp-TiO 2 ) via a two-step low-voltage room-temperature electrochemical deposition method without annealing. The deposited perovskite crystals were applied to cover a surface mp-TiO 2 electron transport material and fill the nanoscale blank of mp-TiO 2 . A mesoporous electron transport material and a platinum sheet were used as working and counter electrodes, respectively. The obtained film was then utilized to fabricate a mesoporous hybrid perovskite solar cell (PSC) with the configuration of a fluorine-doped tin oxide/compact TiO 2 /mp-TiO 2 /perovskite/Spiro-OMeTAD/Au electrode. An efficiency of 15% was achieved by adjusting Pb and MAI deposition and by using champion cells with an active area of 2 mm × 2 mm at 1 sun under an AM 1.5 condition. The perovskite layers and PSCs were analyzed through several characterization methods. Results demonstrated that this deposition technology could be applied to easily control the morphological characteristics of perovskite layers. Thus, a high power conversion efficiency was obtained. This study proposed a possible perovskite deposition process and demonstrated that electrochemical deposition could have potential for application in PSC fabrication.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yue Du,Jiacheng Hu,Yongxu Jin,Yisi Liu,Qiyun Pan,Kai Wang,Lina Zhou,Zhenhui Liu,Xiaodi Du
The development of fast and high yield route for large scale synthesis porous TiO 2 based catalyst has attracted widespread concern in the field of optoelectronic and catalysis. Up to now, the facile synthesis of mesoporous TiO 2 based composite is still limited to wet chemical synthesis approach (hydrothermal, phase transformation, or sol-gel method etc.). Here, we develop a polyethyleneimine-assisted solvent-free strategy to synthesize of ionic liquid-derived Mo-based mesoporous TiO 2 composite, with molybdenum sites uniformly distributed on TiO 2 matrix. As-synthesized ionic liquid-derived mesoporous MoO x /TiO 2 composite is composed of uniform nano-sized anatase particles and connected by worm-like mesoporous channel. Moreover, the calcination conditions and loading amount of molybdenum-containing ionic liquid have been further optimized. These distinct characteristics endow the prospective MoO x /TiO 2 composite with excellent performance in catalytic oxidation reaction, which can remove refractory organic sulfur compound in the model fuel effectively. Our work opens a new solvent-free avenue to synthesis porous metal based ionic liquids/TiO 2 composite.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yumei Peng,Lixia Qin,Jiefei Liu,Shi-Zhao Kang,Guodong Li,Xiangqing Li
Here, by a simple one-step in situ chemical reduction method, the Ag x Cu y alloy was tailored on the surface of mesoporous TiO 2 (M-TiO 2 ), therefore, a series of bi-functional mesoporous TiO 2 nanohybrids (M-TiO 2 /Ag x Cu y ) for both surface enhanced Raman scattering (SERS) detection and photocatalytic degradation of ampicillin (AMP) were achieved. The composition and structure of the nanohybrids were well characterized using XRD, TEM, XPS and HRTEM-EDS measurements. Results indicated that Ag x Cu y alloy was mainly attached around the pores of M-TiO 2 which may generate more active sites than nonporous P25−Ag−Cu. Thus, the M-TiO 2 /Ag x Cu y nanohybrids could be used as efficient SERS substrates to sensitively monitor the AMP in water with lower detection limit (˜ 1 ppt) than P25−Ag−Cu. Besides, the M-TiO 2 /Ag 3 Cu 1 nanohybrid also showed higher photocatalytic activities for the degradation of AMP under UV irradiation over the M-TiO 2 /Ag, the M-TiO 2 /Cu and the P25−Ag−Cu. This work provided a simple and effective approach to synthesize bi-functional nanohybrids for detection and degradation of organic contaminants in wastewater.
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
POWDER TECHNOLOGY
·
2014
·
IF 2.269
Bin Sun,Guowei Zhou,Changwang Shao,Bin Jiang,Jinli Pang,Yan Zhang
Spherical mesoporous TiO 2 particles were prepared by a facile hydrothermal treatment using titanium oxysulfate (TiOSO 4 ) with sodium dodecyl sulfate (SDS) as the structure-directing agent. The structure and morphology of the as-prepared TiO 2 particles were characterized by X-ray diffraction, transmission electron microscopy , field emission scanning electron microscopy , dynamic light scattering , Fourier transform infrared spectroscopy , and N 2 adsorption–desorption isotherms. The results indicate that the as-synthesized TiO 2 particles have spherical mesoporous structures. Moreover, the crystal phase of the particles was the only anatase structure. This finding was attributed to the presence of sulfate ion (SO 4 2 − ), which inhibited the anatase–rutile phase transformation and improved the crystallinity of TiO 2 during TiOSO 4 hydrolysis. The spherical mesoporous TiO 2 materials have very high surface areas, and the mesopores have narrow pore size distributions . In the degradation of papermaking wastewater under ultraviolet light irradiation , the prepared TiO 2 particles exhibited high photocatalytic activity compared with the commercial Degussa P25. The effects of various parameters such as catalyst dosage, solution pH, and irradiation time on the photocatalytic activity of the fabricated TiO 2 powders are discussed. At the optimum dose of 1.0 g L − 1 TiO 2 at pH 4, the particles prepared using an SDS:TiOSO 4 molar ratio of 0.6 exhibited the highest photocatalytic activity, achieving 83.6% COD Cr removal rate in 12 h and 100% chroma removal rate in 8 h.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 7
·5103-5108
·
IF 4.493
Jian Zhi,Angran Chen,Houlei Cui,Yian Xie,Fuqiang Huang
Reducing light-induced e–h recombination is important for a dye sensitized solar cell (DSSC); the p-type NiO component in TiO2–NiO nanoparticles was reported to significantly decrease charge recombination, but its photovoltaic efficiency remains below 4% owing to a small surface area. In this work, we used a one-pot self-assembly process to fabricate flower-like mesoporous TiO2 decorated by NiO oxides, employing a pluronic polymer P123 as a structure directing and pore forming agent. The flower-like porous TiO2–NiO nanoparticles (F–TiO2–NiO NPs), possessing a high BET surface of 130 m2 g−1, are first used as a photoanode in DSSCs. These hybrid nanoparticles, decorated with NiO islands, are beneficial for improving photocurrent by increasing dye absorption and suppressing electron–hole recombination. The optimized F–TiO2–NiO NP anode (10 μm thick) achieved a power conversion efficiency of 8.20%, which is 26% and 47% higher than pristine flower-like TiO2 and commercially available P25 anodes, respectively. This efficiency is the highest among the reported TiO2–NiO hybrid anodes.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Biomedical Nanotechnology
·
2018
·Vol. 14
·期 11
·1965-1978
·
IF 5.068
Liu Jinsong,Pathak Janak L.,Hu Xiaohui,Jin Yifan,Wu Zuosu,Al-Baadani Mohammed A.,Wu Shuyi,Zhang Hualin,Farkasdi Sandor,Liu Yi,Ma Jianfeng,Wu Gang
Implant surface modification that provides local sustained release of osteoinductive therapeutic agents enhances implant stability. We designed a mesoporous TiO2-layered titanium implant (MLT) by modified anodization technique that allowed local sustained release of zoledronic
acid up to 21 days. Mesoporous layer has pore size 15 nm, depth ∼30 μm, volume 0.32 cm3/g, surface area 112.3 m2/g, surface roughness 20 nm and water contact angle 18.3°. Zoledronic acid-loaded MLT (MLT-Z) was biocompatible, showed anabolic effect on
bone forming osteoblasts and catabolic effect on bone resorbing osteoclasts. MLT or MLT-Z implants were implanted in osteoporotic rat-tail vertebrae. Smooth implant in healthy rats were used as a positive control. Histomorphometric analysis showed that bone implant contact of smooth implant
in osteoporotic rats was reduced by 4.1-fold compared to healthy rats and MLT-Z rescued the effect by 53%. Similar effect was observed in implant fixation, mechanical stability, BV/TV ratio, Tb.N, Tb.Th and OI% among the groups. Histological and μ-CT images strongly supported the
above-mentioned findings. In conclusion, a novel surface-fabricated MLT-Z gives local sustained drug release, robustly enhances implant osseointegration and stability in osteoporotic condition, suggesting it as a promising implant model for patients with compromised bone quality.
研究领域:
生物材料
·
骨科
·
药理学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 37
·19266-19272
·
IF 3.708
Zhimin Ren,Xinxin Fu,Chao Chen,Jia Wang,Chenyao Fan,Guodong Qian,Zhiyu Wang
Hierarchical TiO2 sub-microspheres (SMSs) constructed from anatase TiO2 nanorods (NRs) are prepared by a simple bottom-up self-assembly approach. The assembly process is achieved by dissolving the oleic acid-coated NRs into cyclohexane solution and refluxing at 80 °C without any other surfactants or complex steps. The TiO2–C nanocomposite is synthesized by carbonization and the amorphous carbon layer is formed in situ on the surface of the nanorods, which could improve the conductivity of the electrode. The hierarchical structures of TiO2–C SMSs are verified by BET test results, which shows a typical type-IV isotherm curve and the pore volume of the SMSs is approximately three times that of the NRs, indicating the formation of three-dimensional mesoporous networks. As a Li-ion battery anode material, the assembled TiO2–C SMSs exhibit better electrochemical performance with enhanced capacity, greater cyclic stability and better rate performance compared to those of unassembled NRs or P25. Moreover, any other oleic acid-coated nanocrystals could be prepared by adopting this bottom-up strategy.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Yaru Hou,Junyou Yang,Qinghui Jiang,Weixin Li,Zhiwei Zhou,Xin Li,Shuqin Zhou
By dipping the mesoporous TiO 2 film in Sr 2+ solutions and subsequent annealing, a modification layer of SrTiO 3 has been formed on the surface of the mesoporous TiO 2 film, and the effect of modification on the photovoltaic characteristics of the perovskite solar cells has been studied detailedly. The XPS and TEM results verified the existence and nature of the SrTiO 3 modification layer. Benifiting from the TiO 2 surface modification, the morphology of perovskite film and light absorption of the CH 3 NH 3 PbI 3 absorber have been improved effectively, and a faster charge transfer has also been achieved between the CH 3 NH 3 PbI 3 perovskite layer and the modified TiO 2 . As a result, an average conversion efficiency of 11.4% has been achieved in the perovskite solar cell based on the modified mesoporous TiO 2 by 10 mM Sr 2+ solution, and it increases approximately by 46% in comparison with the photovoltaic efficiency of 7.8% of the perovskite solar cell based the bare mesoporous TiO 2 layer.
研究领域:
材料科学
·
光伏技术
✓ 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）