FIBERS AND POLYMERS
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2020
·Vol. 21
·期 4
·717-723
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IF 1.797
Duan Yinli,Ma Jing,Liu Jiao,Qiang Liangsheng,Xue Juanqin
In this paper, a facile and efficient method was performed to prepare the thermo-responsive Poly(N-isopropylacrylamide)/TiO 2 (TiO 2 /PNIPAM) with the dispersing of TiO 2 nanoparticles into PNIPAM. The structures of nanoparticles and the grafted polymer were confirmed by X-ray diffraction (XRD), Raman spectra, Fourier transform infrared spectra (FT-IR) and Dynamic Light Scattering (DLS). The interactions between the two components were studied by X-ray photoelectron spectroscopy (XPS), and the morphology of TiO 2 /PNIPAM was observed by scanning electron microscopy (SEM). The results showed that TiO 2 exhibited homogeneous dispersion, without sacrificing the properties of TiO 2 . Furthermore, The composite was used to photocatalytic degradation of Methylene blue (MB). The highest MB removal efficiency is 86.3 %. The photocatalytic activities above or below the lower critical solution temperature (LCST) of PNIPAM was also investigated. The experiment results show that the existence of PNIPAM contributed not only the thermo-responsive abilities to TiO 2 , but also the enhanced photocatalytic activities to TiO 2 . In addition, the corresponding mechanism of enhanced photocatalytic activity was proposed. The results manifest that the well-designed TiO 2 /PNIPAM is a promising candidate in wastewater treatment application.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 5
·3104-3118
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IF 3.094
Xiang Lv,Zhengyi Zhang,Zhiqiang Cao,Wei Jiang,Lifen Shi,Xiaojuan Zhao,Liyun Ma,Tianhe Wang,Shou Peng
A stable and translucent Bi@Bi 4 Ti 3 O 12 /TiO 2 film was fabricated on conventional glass substrates for the first time. The film exhibited a good photocatalytic performance and efficient self-cleaning capability against organic dyes under full spectral irradiation and visible light irradiation. Bi 4 Ti 3 O 12 /TiO 2 film was first prepared on a glass substrate with colloidal silica as a high temperature binder, followed by implantation of nanoscale Bi in it by an in-situ partially reduction of Bi 4 Ti 3 O 12 to generate Bi@Bi 4 Ti 3 O 12 /TiO 2 films. The improved photocatalytic ability is probably attributed to the surface plasmon resonance of Bi atom as well as the enhanced electron transfer efficiency and synergistic effect of Bi 4 Ti 3 O 12 and TiO 2 . According to trapping experiments, hydroxyl radicals (OH) were active species in the photocatalytic degradation of dyes under full spectral light irradiation and possible photocatalytic mechanism was proposed. The film prepared in this work may well have potential practical applications in many aspects, such as cleansing treatments for high building external decorative panels and also systematic characterization of the film suggests that the in-situ reduction is an effective and simple way to produce nanoscale Bi@Bi 4 Ti 3 O 12 .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Zhiling Ma,Qunpeng Jia,Chang Tao,Bing Han
Selective photocatalytic degradation reactions hold great promise for environmental control by utilizing clean and inexhaustible solar energy, but the selectivity and tunability due to uncontrollable oxidation process remains a challenge. Given the photogenerated reactive oxygen species (ROS) as major oxidants in selective degradation systems, we propose that desirable selectivity for organic pollutant degradation can be achieved by adjusting the corresponding photocatalytic radical production processes. Using the anatase-rich and rutile-rich titanium dioxide (TiO 2 ) with methyl orange-methylene blue (MO-MB) dye aqueous mixture as a model system, we investigate tunability and mechanism details for selective degradation via photocatalytic evaluation and trapping experiments. Benefiting from the selective generation of ROS on rutile-rich TiO 2 and unique properties of immobilized superoxide, the photocatalysts display outstanding tunability and selectivity. This work provides insights into the actual function of immobilized superoxide on selective photocatalytic degradation reactions by discussing a plausible rational reaction process.
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Functional Materials Letters
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2019
·
IF 1.388
Qizhi Tian,Yajun Ji
In this paper, novel chestnut-like TiO 2 was successfully synthesized by the hydrothermal method. The presence of chestnut-like structure not only increased the density of active sites with a high accessibility, but also facilitated the diffusion of solvent and products. Then, the chestnut-like TiO 2 based thin films on FTO were successfully prepared by the doctor-blade method. Moreover, the thickness of thin films can be adjusted via different repeated times. After that, in order to further improve its photoelectric properties, the adoption of CdS sensitization with different time interval via chemical bath route was studied. Photoelectrochemical (PEC) measurements showed that CdS/TiO 2 photoelectrode under the optimal condition exhibited minimal resistance and the fastest charge transfer rate. The highest photocurrent density can reach 35.1 μ A ⋅ cm − 2 , which is almost 5-fold than that of pure chestnut-like TiO 2 (7.6 μ A ⋅ cm − 2 ) based thin films. The enhanced PEC properties could be ascribed to the improvement of light harvesting and the formation of heterostructure to accelerate the separation of photo-generated electron-hole pairs.
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Yongze Xie,Min Zhang,Qianyun Bin,Shilei Xie,Lu'an Guo,Faliang Cheng,Weizhong Lv
The fast and accurate detection of Carcinoembryonic Antigen (CEA) plays an important role in clinical cancer treatment and therapy. An ultrasensitive photoelectrochemical (PEC) immunosensor for the detection of CEA was constructed using CdSe@BiVO 4 co-sensitized TiO 2 nanorods as photoactive materials. TiO 2 nanorods were assembled on the FTO modified electrode to immobilize capture antibodies. With a sandwich immunoassay format, CEA and signal antibodies labelled CdSe@BiVO 4 were introduced in sequence via specific immunoreaction, and the ultrahigh sensitivity of this immunoassay results from the following three aspects. Firstly, the co-sensitization of BiVO 4 and CdSe extends the absorption range of TiO 2 from ultraviolet region to visible light region, which can adequately utilize the light energy; Secondly, the effective matching of energy levels among TiO 2 , CdSe and BiVO 4 accelerates the separation and transfer of photogenerated electron-hole pairs and significantly improves the PEC performance; Finally, the introduced Au evidently expedites the interfacial electron transfer from TiO 2 to FTO electrode, further resulting in noticeably increased photocurrent . Based on multiple signal amplification strategy, a largely linear detection range from 0.01 ng mL −1 to 50 ng mL −1 with a low detection limit (0.5 pg mL −1 ) were obtained. In addition, the prepared immunosensor with attractive properties provides a promising platform for PEC detection.
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PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
·
IF 1.901
Jie Hu,Yi Lu,Xiao-Fang Zhao,Yu-Qian Tang,Yuan-Zhou Li,Yu-Xuan Xiao,Zhi-Yi Hu,Bao-Lian Su,Xiao-Yu Yang
TiO 2 hierarchical microsphere assembled from anatase TiO 2 nanosheets has been successfully prepared and exhibited excellent catalytic activities of H 2 production and benzyl alcohol selective oxidized to benzaldehyde. These enhanced photoactivity can be mainly ascribed to the charge separation promoted by the surface F and nanosheet units, enhancement of substrate molecular transport profited from the hierarchical structure.
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COMPOSITES PART B-ENGINEERING
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2019
·
IF 6.864
Hongsheng Liang,Jiaolong Liu,Yi Zhang,Lei Luo,Hongjing Wu
As everlasting emerging and utilization of electronic devices, the demand for developing excellent electromagnetic (EM) wave absorbing materials is relatively urgent. Herein, the broccoli-like short carbon fibers (SCFs)@TiO 2 composites were synthesized by a simple one-pot hydrothermal method , where TiO 2 was grown vertically on the surface of short carbon fibers to form an independent broccoli-like conductive network, which is beneficial to the conduction loss and strong interfacial polarization , leading to enhanced EM wave absorption capability. Particularly, the uncalcined composite not only showed excellent EM wave absorption performance owing to the significantly improved complex permittivity , but also featured with simple preparation method to save cost. The eddy current loss was also found in our samples which caused magnetic loss mechanism due to the ring current produced in the conductive network. The maximum reflection loss of the SCFs@TiO 2 composites reached up to −58.63 dB at 4.56 GHz. Remarkably, even if at the ultra-thin thickness of 1.1 mm, the effective bandwidth ( RL ≤ −10 dB) of 3.4 GHz could be obtained. All results indicated that the broccoli-like SCFs@TiO 2 composites can be used as an ideal material for preparing light and efficient EM wave absorption devices.
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ANALYTICAL CHEMISTRY
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2019
·
IF 6.35
Junli Guo,Lingling Yang,Huijie Xu,Chenxi Zhao,Zhenqing Dai,Zhida Gao,Yanyan Song
The level of hydrogen sulfide in the brain and vasculature has long been associated with human health and diseases. Hence, simple and robust analytical tools allowing determination of hydrogen sulfide levels are highly desirable. In this work, a biomineralization-driven ion gate in TiO2 nanochannel arrays for H2S sensing was designed and developed. The formed CuS precipitation decreased the transmembrane current in the presence of bovine serum albumin used as biological mineralizer. Label-free assay for sensing of intracellular S2– was achieved based on changes in ionic current with a detection limit of 56 MCF-7 cells. More importantly, the proposed sensing strategy was promising for reusable application through dissolution of CuS in an acidic media (pH = 1).
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Meiling Tu,Jinkun Yu,Jun Wang,Xiao Shi,Zhixiang Fu,Sainan Hu,Mingqiang Zhong,Zhengdong Fei
TiO 2 /Bis[3-(trimethoxysilyl)propyl]amine (BTMSPA) hybrid particles with a coral morphology were prepared using a facile method and used for the removal of methyl orange (MO) dye from wastewater. The structure of the TiO 2 /BTMSPA particles and the adsorption mechanism for MO were analyzed. Meanwhile, the adsorption isotherms and kinetics of MO on the particles were also studied. During the preparation of the TiO 2 /BTMSPA hybrid adsorbent, some of the BTMSPA linked the TiO 2 particles to form a skeleton, while the remaining BTMSPA grew in situ on the TiO 2 surface into nanopapillae, forming a micro/nano-porous coral-like structure. The secondary amine group in BTMSPA acted as an adsorbent via a single molecular layer chemisorption mechanism. In a neutral environment, the decolorization rate of MO was 83.3% after 1 min, eventually reaching 91.2 %. The maximum adsorption capacity was determined to be 90.3 and 369.3 mg/g under neutral and acidic conditions, respectively. Furthermore, the hybrid particles also showed excellent performance for the removal of other anionic dyes and such as methyl blue and amaranth red, with a 100 % decolorization rate. The adsorbent had good universality and excellent regeneration performance after an alkaline washing step.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 128
·期 2
·1095-1100
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IF 1.289
Mengzhu Liu,Zhiqiang Cheng,Juntao Yan,Linhui Qiang,Xin Ru,Fei Liu,Dawei Ding,Junfeng Li
A simple procedure is reported for the fabrication of TiO 2 nanofibers via electrospinning technique using polylactic acid (PLA), tetrabutyl titanate, and hexafluoroisopropanol as a spinning solution. TiO 2 nanofibers (600–700 nm in diameter), with bundled nanofibrils align in the fiber direction, are obtained from the calcination of the as-spun TiO 2 /PLA composite nanofibers at 550°C. The structure and physicochemical property of generated nanofibers are elucidated by Fourier transform-Infrared radiation spectrometer, X-ray diffraction, scanning electron microscope, and Thermogravimetric-differential thermal analysis, respectively. The photocatalytical activity of the TiO 2 nanofibers is testified by quantifying the degradation of methylene orange. The result indicates that the TiO 2 nanofibers with pure anatase phase, which are prepared at 550°C, shows an excellent photocatalytic activity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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DESALINATION
·
2012
·
IF 2.59
Shanshan Zhao,Peng Wang,Ce Wang,Xin Sun,Linhuan Zhang
Poly (phthalazine ether sulfone ketone) (PPESK)/TiO 2 organic–inorganic composite ultrafiltration (UF) membranes with enhanced performance for high temperature condensed water treatment were prepared using a phase-inversion method. The effects of TiO 2 concentration on the membrane morphologies, physic-chemical properties, membrane permeability and antifouling performance were investigated and discussed. The SEM result reveals that the penetrated finger-like structure in sublayer is suppressed, and sponge-like structure begins to be developed. The mechanical strength and thermal stability of composite membrane are improved due to the existence of hydrogen bond between TiO 2 and polymer. The permeate flux is also enlarged due to the improved hydrophilicity and porosity. Compared with neat PPESK membrane, the composite membranes present improved antifouling properties, showing lower filtration resistances, MFI values and better flux recover property during high temperature condensed water treatment. The optimal addition amount of TiO 2 is 2 wt.%. The high temperature condensed water with excess oil and iron can be treated efficiently using PPESK/TiO 2 composite membrane. The turbidity of feed solution is almost removed. The oil and iron concentrations in permeate solution are 0.89 mg/L and 26.4 μg/L which meet the Quality Criterion of Water and Steam for Steam Power Equipment in China.
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SOLID STATE SCIENCES
·
2012
·
IF 1.856
Chunjing Zhang,Jinlong Yan,Chunxiao Zhang,Zhengpeng Yang
TiO 2 film imprinted by atrazine molecule at the surface of quartz crystal was prepared using molecular imprinting and surface sol-gel process. The molecularly imprinted TiO 2 film was characterized by scanning electron microscopy and cyclic voltammetry , and the atrazine adsorption was investigated by quartz crystal microbalance (QCM) technique. In comparison with non-imprinted TiO 2 film, the molecularly imprinted TiO 2 film exhibits high selectivity for atrazine, better reversibility and a much higher adsorption capacity for the target molecule, the adsorption equilibrium constant estimated from the in situ frequency measurement is about 6.7 × 10 4 M −1 , which is thirteen times higher than that obtained on non-imprinted TiO 2 film.
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