TALANTA
·
2018
·
IF 4.244
Lu-Lu Qu,Na Wang,Gen Zhu,T.P. Yadav,Xinting Shuai,Dandan Bao,Guohai Yang,Dawei Li,Haitao Li
A bi-functional ternary nanocomposite was developed by decorating TiO 2 and gold nanoparticles on the reduced graphene oxide nanosheets (TiO 2 -Au-rGO) for recyclable surface enhanced Raman scattering (SERS) detection. TiO 2 -Au-rGO nanocomposites have been shown to demonstrate the superior SERS performances, which can be used for highly sensitive detection of rhodamine 6 G with a limit of detection of 1.2 × 10 −10 M. Subsequently, the surface can be cleaned automatically by the photocatalytic degradation of the adsorbed analytes into inorganic small molecules under visible light irradiation . This can be attributed to the excellent photocatalytic degradation ability, leading to a recyclable SERS application. After being used four times, their excellent SERS and catalytic performances can still be retained. These results suggest that the TiO 2 -Au-rGO nanocomposites can provide a new strategy for fabricating recyclable SERS substrates, which are highly desirable for SERS practical application.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 32
·15755-15761
·
IF 9.931
Sainan Luo,Pengcheng Zhang,Tao Yuan,Jiafeng Ruan,Chengxin Peng,Yuepeng Pang,Hao Sun,Junhe Yang,Shiyou Zheng
Spinel lithium titanate (Li4Ti5O12, LTO) is one of the most appealing anode materials for lithium-ion batteries (LIBs) due to its long cycle life and high safety performance. However, its low intrinsic electronic conductivity limits its high rate capability. Herein, we develop a novel one-pot in situ molecular self-assembly approach to prepare a dual N- and anatase-TiO2- modified Li4Ti5O12/C nanorod material (NT-LTO/C). Polypyrrole (PPy), as a pivotal carbon and nitrogen source, is introduced to confine the morphology and particle size of the NT-LTO/C anode. Due to the synergistic effects of the multilevel particle structure, uniform carbon coating, N doping, anatase TiO2 pseudopotential effect and such benefits, the NT-LTO/C electrode delivers a high reversible capacity of 196.3 mA h g−1 at 0.5C, and it maintains 105.5 mA h g−1 even at an ultrahigh rate of 100C with progressive cycling of more than 3000 cycles. In addition, the three electrode pouch full-cell shows much smaller polarization than the pristine one. This novel and facile molecular self-assembly method has broad advanced functional material applications including for ceramics, polymer/carbon-based metal alloys and inorganic non-metallic materials.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 17
·14546-14556
·
IF 2.324
Sun Linchao,Yao Zhengjun,Haidry Azhar Ali,Li Zhong,Fatima Qawareer,Xie Lijuan
The paper demonstrated cost-effective one-step hydrothermal process to synthesize TiO 2 microrods modified with Cr 2 O 3 nanoparticles. The crystal structure, microstructure and chemical composition of the obtained materials were characterized by XRD, SEM, TEM and EDS analysis. Subsequently, for gas sensor tests the sensors were fabricated onto a ceramic tube having a designed pair of Au electrodes with four Pt wires. The results indicate that the sensors based on the optimal content of Cr 2 O 3 nanoparticles modified TiO 2 microrods possess excellent gas-sensing performance to acetone. Specifically, the sensor based on optimal 3% Cr 2 O 3 modified TiO 2 microrods exhibited high response (15), fast response/recovery time (5/28 s), outstanding selectivity (against 100 ppm ethanol, methanol and formaldehyde) and good stability (1–40 days) towards 100 ppm acetone at 300 °C. Relying on the analysis, we infer that performance can be controlled by varying the Cr 2 O 3 contents. A plausible sensing mechanism is also discussed to explain the reasons for the enhanced acetone sensing with Cr 2 O 3 –TiO 2 heterostructures.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chang Liu,Pengcheng Wu,Jianning Wu,Juan Hou,Hongcun Bai,Zhiyong Liu
Carbon layer coated black TiO 2−x /g-C 3 N 4 nanosheets (C@TiO 2−x /CNNS) heterojunction photocatalysts were successfully prepared via a polydopamine dopamine carbonization route for the first time. It was found that the hydrogen evolution rate of C@TiO 2−x /CNNS was 417.2 μmol h −1 g −1 under visible light irradiation, which was much higher than that of other prepared photocatalysts in solar water splitting process at the same conditions, and obvious decrease in catalytic activity can be observed after three recycles. The formation of carbon layer on the surface of TiO 2−x can effectively protect Ti 3+ and oxygen vacancies (O vs ) from oxidation by air and dissolved O 2 , afterwards much more Ti 3+ /O vs are exsited, which can serve as charge carrier traps to inhibit the recombination of light-excited electrons-holes. Therefore, C@TiO 2−x /CNNS showed a highly conductivity, rapidly effective electron-hole separation and lower transmission resistance comprehensive consideration of the advantages of carbon layer and hetero-junction, which are of great benefit to the improvement of photocatalytic performance. Hence, a new catalytic tactic namely layer-protection effect was founded and this strategy for boosting hydrogen evolution and protection Ti 3+ /O vs may give us some hints on the design of photocatalytic systems.
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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.
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DYES AND PIGMENTS
·
2018
·
IF 3.767
Lei Zhang,Cunyu Li,Jingfa Li,Fan Jiang
Photo-responsive molecules have been widely investigated since they exhibit potential applications in optoelectronics and molecular devices. Although the photocurrents in some photo-responsive systems can be successfully turned ‘on’ and ‘off’ via light irradiation, the modulation of the vastly different directions of electron flow have seldom been realized by light (i.e., induce electron flow in opposite directions simply by light). In this manuscript, we provide evidence that the electron flow directions could be successfully controlled by light, using a molecule/TiO 2 hybrid system based on azo dyes (methyl red and ethyl red) as an example. In particular, a light-induced current exists when a UV light is employed, while the photocurrent direction isreversed when a visible light is employed. Possible origins of such peculiar photoelectrochemical behaviors are suggested, based on the optimized structures and electronic/optical properties determined from the first principles calculations. We expect that with further molecular engineering and structure optimization, the electron flow directions as well as the photocurrent intensities in functional materials could be better controlled by light, which provide a foundation for the fundamental understanding of the photo-responsive behaviors in advanced functional materials, and may pave the way for the design of novel optoelectronic devices and solar fuel systems in which the opposite electron transfer directions could be manipulated remotely by light sources.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11043-11053
·
IF 2.195
Zheng Jianfeng,Deng Xueshuang,Zhou Xin,Yu Meidong,Xia Zhetao,Chen Xiaohong,Huang Sumei
We report a strategy to fabricate high quality TiO 2 nanrod array ETLs for efficient PSC devices with Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 triple cation composition perovskite as light absorption material. Mg doped compact TiO 2 (c-TiO 2 ) was employed as seeds for hydrothermal growth of one-dimensional (1D) TiO 2 nanorod (NR) arrays. Assisted with these seed layers, Mg and Er doped TiO 2 rutile NR arrays were synthesized using tetrabutyltitanate (TBT) and Er(NO 3 ) 3 as Ti and Er precursors, respectively. It was found that uniform, straight and vertical TiO 2 NRs with a high area density were formed using Mg and Er co-modification, improving the pore-filling and crystallization of the triple cation perovskites, facilitating charge separation and suppressing recombination at the perovskite/titania NR interface of the PSC device. The shorter PL decay time with Mg/Er doping compared to the cases without Mg or Er doping is assigned to the more excellent electron extraction from the mixed cation perovskite film. The control device without modification shows an average power conversion efficiency (PCE) of 17.10%. Under the same fabrication conditions, doping of the single element Er or Mg or both Mg and Er enhances the average PCE to 17.54, 18.41 and 18.99% respectively. Our champion cell based on Mg/Er modified TiO 2 NR arrays demonstrates a PCE of 19.11%, exhibiting an enhancement of 10.33% compared with that of the PSCs based on unmodified TiO 2 NR arrays (17.32%). This work provides a simple and efficient interface engineering method to improve the efficiency of the mixed cation PSCs.
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Polymers
·
2019
·Vol. 11
·期 5
·775
·
IF 3.164
Fei Sun,Ting-Ting Li,Haitao Ren,Qian Jiang,Hao-Kai Peng,Qi Lin,Ching-Wen Lou,Jia-Horng Lin
This study aims to produce polypropylene (PP)/titanium dioxide (TiO2) melt-blown membranes for oil/water separation and photocatalysis. PP and different contents of TiO2are melt-blended to prepare master batches using a single screw extruder. The master batches are then fabricated into PP/TiO2melt-blown membranes. The thermal properties of the master batches are analyzed using differential scanning calorimetry and thermogravimetric analysis, and their particle dispersion and melt-blown membrane morphology are evaluated by scanning electron microscopy. TiO2loaded on melt-blown membranes is confirmed by X-ray diffraction (XRD). The oil/water separation ability of the melt-blown membranes is evaluated to examine the influence of TiO2content. Results show that the thermal stability and photocatalytic effect of the membranes increase with TiO2content. TiO2shows a good dispersion in the PP membranes. After 3 wt.% TiO2addition, crystallinity increases by 6.4%, thermal decomposition temperature increases by 25 °C compared with pure PP membranes. The resultant PP/TiO2melt-blown membrane has a good morphology, and better hydrophobicity even in acetone solution or 6 h ultraviolet irradiation, and a high oil flux of about 15,000 L·m−2·h−1. Moreover, the membranes have stabilized oil/water separation efficiency after being repeatedly used. The proposed melt-blown membranes are suitable for mass production for separating oil from water in massively industrial dyeing wastewater.Keywords:polypropylene;membranes;melt-blowing process;oil/water separation;photocatalysis
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhenqi Cui,Jia Yao,Tao Mei,Shiyuan Zhou,Baofei Hou,Jing Li,Jinhua Li,Jianying Wang,Jingwen Qian,Xianbao Wang
In our study, TiC-TiO 2 /S composite was successfully prepared with a simple and effective method. For this special micro-mesoporous structure, TiC-TiO 2 can be used as an efficient sulfur storing material, and also restrain the volume expansion of sulfur to a certain degree for its suitable specific surface area. TiO 2 and TiC can suppress the diffusion of polysulfides due to their strong interaction with polysulfides . At the same time, TiC also can remedy the nonconductive defect of sulfur for its good conductivity. With the help of above advantages, the TiC-TiO 2 /S cathode delivers an initial discharge specific capacity of 1218 mAh g −1 at 1 C (1 C = 1675 mA g −1 ) with the sulfur loading of 1.5 mg cm −2 . And when cycles at 0.5 C, a stable capacity of 714 mAh g −1 can be maintained after 500 cycles accompanied with the sulfur loading of 1.1 mg cm −2 .
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 8
·1715-1725
·
IF 1.353
Deb Hridam,Xiao Shili,Morshed Mohammad Neaz,Al Azad Shamim
We report a facile approach to fabrication and characterization of cationic titanium dioxide (TiO 2 + ) on poly (vinyl alcohol)/poly (acrylic acid) (PVA/PAA) composite electro-spun nanofibrous mat. The aim of this study is to develop a “functional electrospun nanofibrous mat” as a sustainable approach to superior photocatalytic degradation of organic colorants. For that, the PVA/PAA nanofibrous mat was prepared by electrospinning of PVA and PAA solution according to an aspect ratio of 1:1 and later water stability was induced by the thermal cross linking at an elevated temperature of 145 °C for 30 minute. By means of electrostatic layer-by-layer (LbL) assembly, cationic titanium dioxide (TiO 2 + , ~19 nm) was immobilized on the surface of the water stable nanofibrous mat. As functionalized composited nanofibrous mat was characterized by using scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis and thermogravimetric analysis (TGA). Superior competency of the functionalized nanofibrous mat towards photocatalytic degradation of organic dye (methyl blue) in aqueous solution was observed by using UV-visible spectrophotometer with quantitative measuring method. The result indicates a complete degradation of methyl blue within 40 mins and superior reusability upto 5 cycles application. The study signifies the prospect of using electrospun nanofibers to manipulate the catalytic activity, which could be a foundation for further rational design of various composite nanofibrous materials.
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MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junyan Kuang,Junwei Yin,Ning Wan,Qi Zhu,Wei Zhou
In-situ Ti 3+ /S doped high thermostable anatase TiO 2 nanorods using ethanediamine-modified TiOSO 4 as precursor are synthesized under 700 °C calcination , then combined with controllable in-situ solid-phase reaction method, calcined at 350 °C in argon. The outcomes declare that the obtained photocatalyst with a high crystallinity is effectively doped with S element and Ti 3+ species, and synchronously possesses one-dimensional (1D) anatase nanorods structure with length of ∼ 2–5 μm and width of ∼0.5–1 μm. The S and Ti 3+ co-doped 1D nanorod with a narrowed bandgap (2.56 eV) stretches the optical response range to visible-light. The visible-light-driven photocatalytic degradation efficiency of methyl orange and H 2 production rate for Ti 3+ /S-TiO 2 nanorods are as high as 96% and 166 μmol h −1 g −1 , showing about 6 times greater than 600-TR (TiO 2 nanorods). This is be ascribed to the synergistic reaction of S and Ti 3+ species co-doping narrows the bandgap and promotes the separation efficiency of photoexcited carriers, and the one-dimensional structure favors the transportation of photogenerated charge carriers. Hence, the prepared photocatalyst will have a great latent application prospect in fields of energy and environment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15662-15670
·
IF 2.8
Li Ji,Wang Yanhong,Tian Yiyuan,He Xuan,Yang Pingping,Yuan Minghui,Cao Yuqing,Lyu Jinze
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants, separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst, namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity. Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous amorphous TiO 2 (Micro) and toluene mineralization were studied using N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO 2 (P25). The micropores concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
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