CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Muhan Cao,Peifang Wang,Yanhui Ao,Chao Wang,Jun Hou,Jin Qian
A magnetically separable graphene–TiO 2 (MG–TiO 2 ) hybrid photocatalyst was successfully prepared by a one step method. Namely, simultaneous reduction of graphene oxide and deposition of TiO 2 on the graphene was occurred in one single process. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) analysis, X-ray photoelectron spectroscopy (XPS) and The Brunauer–Emmett–Teller (BET) analysis. The photocatalytic activity of the obtained samples was measured by the decomposition of methylene blue (MB) and tetrabromobisphenol A (TBBPA, a brominated flame retardant) under UV light irradiation. The results showed that MG–TiO 2 exhibited much higher photocatalytic performance than that of bare TiO 2 . The enhanced activity can be ascribed to the incorporation of graphene. In addition, the MG–TiO 2 with MG content of 3% exhibited the highest activity towards MB and TBBPA degradation. The intermediates of TBBPA in the photocatalytic degradation process were analyzed by LC–MS. On the basis of the identified intermediates, the photocatalytic degradation pathway of TBBPA was proposed. Furthermore, the recyclable ability of the samples was also studied and the results showed that the samples exhibited high stability.
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高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 15
·3091-3096
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IF 3.858
Yong Yang,Guozhong Wang,Quan Deng,Shenghong Kang,Dickon H. L. Ng,Huijun Zhao
High-energy {100} faceted single crystal TiO2 nanorods were synthesized by a facile hydrothermal method. An interesting phase transition from the orthorhombic hydrogen titanate to anatase TiO2 was observed during the reaction process. A structural formation model of the TiO2 nanorods was proposed based on experimental evidence. The resultant {100} faceted TiO2 nanorods exhibited considerably enhanced photocatalytic activity towards degradation of organic pollutants and removal of heavy metal ions owing to the special one-dimensional structure with the reactive {100} facets, thus showing a great potential in the field of water treatment. At the same time, the synthetic route provided guidance for the synthesis of high-energy {100} facets using EDTA and urea as effective modifiers. This approach may be extended to synthesize other functional oxide crystals with well-defined morphologies and to increase the percentages of certain exposed facets.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Zixin Yang,Xu Zhang,Jie Cui
In this work, an efficient and simple supramolecular approach to introduce cyclodextrin on TiO 2 was demonstrated using the protocatechuic acid functionalized β-cyclodextrin (PCA-β-CD) that had a bioinspired catecholic structure. Two types of PCA-β-CD/TiO 2 heterosupramolecules were obtained through a facile dip coating of TiO 2 nanoparticles (Hombikat UV-100 and Fe 3 O 4 @SiO 2 @TiO 2 ) in PCA-β-CD aqueous solution. The high surface coverage of Hombikat UV-100 or Fe 3 O 4 @SiO 2 @TiO 2 by the attached PCA-β-CD was calculated to be 49.4% or 74.2% in the PCA-β-CD/TiO 2 based on the TGA results, and it was also confirmed by the optical properties study that PCA-β-CD located onto the TiO 2 surface mainly through the coordination of the catechol part on the cyclodextrin small ring side and TiO 2 . Compared with the adsorption amount onto bare UV-100 and Fe 3 O 4 @SiO 2 @TiO 2 , the adsorption of bisphenol A onto PCA-β-CD/UV-100 and PCA-β-CD/Fe 3 O 4 @SiO 2 @TiO 2 was 6.9 and 7.9 times higher, respectively, because of the high inclusion affinity between PCA-β-CD's cavity and bisphenol A. Moreover, the two PCA-β-CD/TiO 2 heterosupramolecules showed a high photoactivity to bisphenol A under light irradiation extending to the visible-light range. The cyclic use and X-ray photoelectron spectroscopy analysis results revealed that the PCA-β-CD layer in PCA-β-CD/TiO 2 was stable and that the catalyst possessed reusable properties.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·755-763
·
IF 3.086
Zhihong Zhang,Hongfei Ji,Shuai Zhang,Donglai Peng,Qixuan Fu,Minghua Wang,Linghao He,Lingyu Yue
We report a novel nanocomposite of hollow TiO2 microspheres and plasma polyacrylic acid (TiO2@PPAA) modified with rhodamine B (TiO2@PPAA-RhB). This nanocomposite was further used as an electrochemical sensor for the ultra-sensitive and selective detection of Cu2+ in water. A gold electrode was modified with hollow TiO2 nanospheres, followed by the closely bonded layer of PPAA via plasma polymerization. Subsequently, the carboxyl groups of TiO2@PPAA nanocomposites were activated to ester groups by N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminoprolyl) carbodiimide hydrochloride. The resultant activated ester groups reacted with the amino groups on rhodamine to form the amide groups, leading to the modification of TiO2@PPAA nanocomposites with rhodamine. Considering the synergistic effect of strong electrostatic interaction between the carboxyl groups of PPAA and Cu2+, the direct adsorption of Cu2+ on the TiO2 surface, and the coordination chemistry formed between Cu2+ and rhodamine, the developed electrochemical biosensor exhibited high sensitivity of Cu2+ detection, with a detection limit of 0.404 pM within the range of 0.001–10 nM of Cu2+. Therefore, the fabricated electrochemical sensor based on TiO2@PPAA-RhB can be obtained via plasma polymerization and represents a highly promising tool for use in environmental monitoring.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11437-11443
·
IF 7.443
Shusheng Pan,Xiaolin Liu,Min Guo,Siu fung Yu,Haitao Huang,Hongtao Fan,Guanghai Li
Ti3+-doped amorphous TiO2 nanoparticles (a-TiO2:Ti3+), which are an intermediate band semiconductor, were fabricated by high intensity ultraviolet pulsed laser ablation in water. The absorption band of a-TiO2:Ti3+ nanoparticles, which appears between the visible and infrared regions, is much wider than that of the rutile TiO2 nanoparticles. The intermediate band, which has a recombination lifetime of 0.71 μs, is found to be 1.61 eV above the valence band (VB) top of TiO2. It can be shown that the a-TiO2:Ti3+/TiO2 nanotube hybrid dye-sensitized solar cells (DSSCs) not only have a high fill factor and large open circuit voltage, but also have high photovoltaic conversion efficiency as compared to TiO2 nanotube DSSCs. Considering that most of the current solar cells use only a single photoelectric conversion material (PCM), our results will promote the research on multi-PCM hybrid solar cells.
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ADVANCED POWDER TECHNOLOGY
·
2015
·
IF 2.638
Yuan-Yuan Yu,Bing-Xin Lei,Min-Li Xie,Guo-Lei Huang,Wei Sun,Zhen-Fan Sun
Core–shell TiO 2 (cs-TiO 2 ) hollow microspheres are prepared via a facile hydrothermal method, by using titanium potassium oxalate precursor in dilute sulfuric acid. The characterization shows that the as-prepared TiO 2 microspheres have core–shell structure. The diameters of cs-TiO 2 microspheres are in the range of 2–5 μm. The optical investigation evidences that the cs-TiO 2 microsphere film exhibits a prominent light-scattering effect at a wavelength range of 600–800 nm. The cs-TiO 2 microspheres are applied as a scattering layer on top of a nanocrystalline P25 film, serving as the photoanode of dye-sensitized solar cells (DSSCs). A high efficiency of 7.7% is achieved after introducing the cs-TiO 2 hollow microsphere scattering layer, compared with 6.21% for the photoanode with commercial P25. Based on the optical investigation and electrochemical impedance measurement, the improved efficiency can be ascribed to the enhanced light-scattering ability and the reduced interface recombination rate.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2014
·
IF 2.2
Min Xi,Yulan Zhang,Lizhen Long,Xinjun Li
Rutile TiO 2 nanorod arrays (TNRs) were achieved by hydrothermal process on TiCl 4 pretreated Ti foil. Subsequently, TNRs were hydrothermally etched in HCl solution to form hollow TiO 2 nanorod arrays (H-TNRs). The TiCl 4 pretreatment plays key roles in enhancement of Ti foil corrosion resistance ability and crystal nucleation introduction for TNRs growth. TNRs with desired morphology can be obtained by controlling TiCl 4 concentration and the amount of tetrabutyl titanate (TTB) accordingly. TNRs with the length of ~1.5 μm and diameter of ~200 nm, obtained on 0.15 M TiCl 4 pretreated Ti foil with 0.6 mL TTB, exhibits relatively higher photocurrent . The increased pore volume of the H-TNRs has contributed to the increased surface area which is benefit for Dye-Sensitized Solar Cells (DSSC) application. And the 180 °C-H-TNRs photoanode obtained from the 0.15-TiCl 4 -TNRs sample demonstrated 128.9% enhancement of photoelectric efficiency of DSSC compared to that of the original TNR photoanode.
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Scientific Reports
·
2014
·Vol. 4
·期 1
·1-7
·
IF 5.078
Xin Ling,Liu Yong,Li Baojun,Zhou Xiang,Shen Hui,Zhao Wenxia,Liang Chaolun
Here, we report a facile hydrothermal approach for synthesizing anatase TiO 2 hierarchical mesoporous submicrotubes (ATHMSs) with the aid of long-chain polymer as soft template. The TiO 2 nanocrystals, with sizes of 6–8 nm, are well interconnected with each other to build tubular architectures with diameters of 0.3–1.5 μm and lengths of 10–25 μm. Such highly porous structures give rise to very large specific surface area of 201.9 m 2 g −1 and 136.8 m 2 g −1 for the as-prepared and annealed samples, respectively. By using structurally stable ATHMSs as anode materials for lithium-ion batteries, they exhibited high reversible capacity, long cycling life and excellent cycling stability. Even after 1000 cycles, such ATHMS electrodes retained a reversible discharge capacity as high as 150 mAh g −1 at the current density of 1700 mA g −1 , maintaining 92% of the initial discharge capacity (163 mAh g −1 ).
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PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2014
·
IF 3.32
Fuhai Yu,Yanjie Wang,Hailian Tang,Yanjie Zhang,Changzi Jin,Xin Liu,Mingrun Li,Junhu Wang
The synergic effect of cation doping and phase composition for the further improvement of the photocatalytic activity of TiO 2 under visible light is reported for the first time. Fe 3 + and Sn 4 + co-doped TiO 2 with optimized phase composition were synthesized through a simple soft-chemical solution method. The visible-light-driven photocatalytic activity of Fe 3 + and Sn 4 + co-doped TiO 2 was 5 times of that of Evonik P25 TiO 2 using degradation of methylene blue as model reaction. The synthesized photocatalysts were characterized by powder X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, 119 Sn Mössbauer spectroscopy, and X-ray absorption fine structure spectroscopy. It is indicated that Sn 4 + doping can facilitate the phase transition from anatase to rutile. The different ratios of anatase and rutile can be achieved by tuning the amount of Sn 4 + doped into the lattice. Furthermore, the doping of Sn 4 + into TiO 2 lattice can stabilize the phase composition when Fe 3 + is co-doped. In the Fe 3 + and Sn 4 + co-doped TiO 2 , Sn 4 + is mainly used to tune and stabilize the phase composition of TiO 2 and Fe 3 + acts as a doping cation to narrow the band gap of TiO 2 . Both band gap and phase composition of TiO 2 can be tuned effectively by the simultaneous introduction of Fe 3 + and Sn 4 + . The synergic effect of optimized phase composition (anatase/rutile = 25/75) and narrowed band gap should be the two main reasons for the promoted photocatalytic activity of TiO 2 under visible light.
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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.
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ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·161-168
·
IF 2.138
Meichuan Liu,Jing Yu,Xue Ding,Guohua Zhao
In this work, a visible-light driven photoelectrochemical (PEC) aptasensor with high sensitivity and selectivity for cyanobacterial toxin Microcystin-LR (MC-LR) has been developed. MC-LR aptamers, serving as the specific recognition element, were conveniently immobilized onto vertically-aligned titanium dioxide nanotubes (TiO 2 NTs) photoanode substrate with the aid of graphene via π–π stacking interactions between the graphene hexagonal cells and the nucleobases of the DNA. The functionalization of graphene further endowed the constructed aptasensor visible-light response activity. The aptasensor was used for the label-free analysis of MC-LR by monitoring the increase in photocurrent that resulted from the binding of MC-LR and its aptamers. Results showed that the photocurrent increment had a linear relationship with logarithm of MC-LR concentration in the range from 1.0 to 500 fM and the limit of detection reached as low as 0.5 fM. Furthermore, the aptasensor exhibited high selectivity while used to detect 100-fold concentration other several potential coexisting interferents. A promising PEC aptasensing platform for highly sensitive and selective monitoring of MC-LR has thus been established.
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Zheng-peng Yang,Xuan Liu,Chun-jing Zhang,Bao-zhong Liu
Transparent photocatalytic surfaces are of ever increasing importance for the enhancement of the photocatalytic efficiency. Here, the highly ordered transparent TiO 2 nanotube arrays were prepared by the anodization and thermal annealing of titanium layer deposited onto the glass substrate , and a novel nonenzymatic piezoelectric sensor was developed for urea detection based on the modification of molecularly imprinted TiO 2 thin film onto transparent TiO 2 nanotube arrays. The performance of the fabricated sensor was evaluated and the results indicated that the sensor exhibited high sensitivity in urea detection, with a linear range from 0.04 to 120 μM and a limit of detection of 0.01 μM. Moreover, the sensor presented outstanding selectivity while used in coexisting systems containing various interferents with high concentration. The analytical application of the urea sensor confirmed the feasibility of urea detection in urine sample.
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