JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Lin Tang,Yaocheng Deng,Guangming Zeng,Wei Hu,Jiajia Wang,Yaoyu Zhou,Jingjing Wang,Jing Tang,Wei Fang
This paper described a facile method for the design and utilization of three-dimensional TiO 2 branched nanorod arrays with CdS and Cu 2 S quantum dots co-sensitized photoelectrode for photoelectrochemical water splitting . CdS and Cu 2 S quantum dots were attached on the surface of TiO 2 BNRs by successive ionic layer adsorption and reaction (SILAR). The morphology and element composition of the fabricated samples were characterized by field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and the optical features were measured by UV–vis diffuse reflection spectroscopy (UV–vis DRS) and photocurrent density–voltage (I–V) curves. The photocurrent value can be significantly enhanced due to the introduction of CdS and Cu 2 S quantum dots on the TiO 2 BNRs surface. The 9 cycles of CdS and 6 cycles of Cu 2 S presented the best performance and reached a high photocurrent density to 13.65 mA at 0 V versus Ag/AgCl and hydrogen generation efficiency of 7.74% at −0.467 V versus Ag/AgCl. This enhancement can be attributed to the improved light absorption and the heterojunction formed between CdS and Cu 2 S, which can greatly promote the introduction and transportation of the photo electrons. This work provided a facile way for the synthesis of high performance photoelectrode for photoelectrochemical water splitting.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2014
·
IF 3.163
Bin Xia,Bijuan Chen,Xuemei Sun,Keming Qu,Feifei Ma,Meirong Du
The toxicity of TiO 2 engineered nanoparticles (NPs) to the marine microalga Nitzschia closterium was investigated by examining growth inhibition, oxidative stress and uptake. The results indicated that the toxicity of TiO 2 particles to algal cells significantly increased with decreasing nominal particle size, which was evidenced by the 96 EC 50 values of 88.78, 118.80 and 179.05 mg/L for 21 nm, 60 nm and 400 nm TiO 2 particles, respectively. The growth rate was significantly inhibited when the alga was exposed to 5 mg/L TiO 2 NPs (21 nm). Measurements of antioxidant enzyme activities showed that superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities were first induced and subsequently inhibited following exposure to 5 mg/L TiO 2 NPs. The depletion of antioxidant enzymes with a concomitant increase in malondialdehyde (MDA) levels and reactive oxygen species (ROS) posed a hazard to membrane integrity. A combination of flow cytometry analysis, transmission electron microscopy and Ti content measurement indicated that TiO 2 NPs were internalized in N. closterium cells. The level of extracellular ROS, which was induced by TiO 2 NPs under visible light, was negligible when compared with the intracellular ROS level (accounting for less than 6.0% of the total ROS level). These findings suggest that elevated TiO 2 nanotoxicity in marine environments is related to increased ROS levels caused by internalization of TiO 2 NPs.
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PubMed
高影响因子
Nanomaterials and Nanotechnology
·
2016
·
IF 1.109
JiaDong Chen,WeiSha Liao,Ying Jiang,DanNi Yu,MeiLing Zou,Han Zhu,Ming Zhang,MingLiang Du
In this study, novel titanium dioxide (TiO2) and zinc oxide (ZnO) hybrid photocatalysts in the form of nanofibres were fabricated by a facile method using electrospinning followed by a calcination process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed to investigate the morphology and structure of the heterogeneous nanofibres. The photocatalytic performances were evaluated via the photodegradation of Rhodamine B (RhB) under irradiation with UV light. Due to the low recombination rate of photo-induced charge carriers, the high utilization efficiency of UV light and the large contact area with the target molecules, the ZnO/TiO2 hybrid nanofibres exhibited high catalytic activity towards the Rhodamine B, and the amount of Zn(OAc)2 in the precursor of these nanofibres played an important role in determining the photo decomposition performance.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Zhiqiao He,Juntao Tang,Jie Shen,Jianmeng Chen,Shuang Song
TiO 2 nanosheets modified with various concentrations of sulfuric acid have been synthesized through hydrothermal treatment at 240 °C followed by heat treatment at 105 °C. Compared with untreated TiO 2 nanosheets, the H 2 SO 4 -modified samples exhibited markedly improved quantum yield (QY), energy returned on energy invested (EROEI), and turnover number (TON) for CO 2 reduction to CH 4 under visible-light irradiation. As supported by physical-chemical characterization, the enhanced photocatalytic activities can be attributed to acidification promoting the formation of hydroxyl groups (Brønsted acidic sites) and oxygen vacancies/Ti 3+ species. Thus, efficient charge separation and transfer to the TiO 2 surface for both CO 2 reduction and the accompanying H 2 O oxidation is facilitated. The highest activity for CO 2 photoreduction to CH 4 was obtained with TiO 2 nanosheets with 0.5 mol L −1 H 2 SO 4 , with QY, EROEI, and TON of 0.726‰, 0.335‰, and 83.124, respectively. Furthermore, the catalyst maintained stable performance throughout five successive recyclability test runs.
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Nanoscale
·
2014
·Vol. 6
·期 17
·10216-10223
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IF 6.739
Huaqiao Tan,Zhao Zhao,Mang Niu,Chengyu Mao,Dapeng Cao,Daojian Cheng,Pingyun Feng,Zaicheng Sun
Colored TiO2 has attracted enormous attention due to its visible light absorption and excellent photocatalytic activity. In this report, we develop a simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 at mild temperature (300–350 °C). The obtained sample possesses a crystalline core/amorphous shell structure (TiO2@TiO2−x). The oxygen vacancy results in the formation of a disordered TiO2−x shell on the surface of TiO2 nanocrystals. XPS and theoretical calculation results indicate that valence band tail and vacancy band below the conduction band minimum appear for the TiO2−x, which implies that the TiO2@TiO2−x nanocrystal has a narrow band gap and therefore leads to a broad visible light absorption. Oxygen vacancy in a proper concentration promotes the charge separation of photogenerated carriers, which improves the photocatalytic activity of TiO2@TiO2−x nanocrystals. This facile and general method could be potentially used for large scale production of colored TiO2 with remarkable enhancement in the visible light absorption and solar-driven H2 production.
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 66
·41838-41846
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IF 3.108
Yanqing Du,Yujiang Li,Tao Wu
Oil/water separation has become a worldwide challenge due to large volumes of industrial oily wastewater and frequent oil spill accidents, which constitute an enormous threat to human and biological safety. Herein, a superhydrophilic and underwater superoleophobic composite membrane was fabricated using the vacuum-assisted filtration technique of assembly of chitosan (CS) and titanium dioxide (TiO2) on a cellulose acetate membrane for emulsified oil separation. The hydrophilic chitosan–TiO2 (CST) composite and nanoscale hierarchical structure are beneficial for forming a water layer that can repel the infiltration of oil droplets into the membrane. The modified membrane demonstrated an excellent flux up to 6002.5 L m−2 h−1 for hexadecane-in-water emulsion, which is one order of magnitude higher than traditional filtration membranes. Furthermore, the separation efficiency for all of the emulsified oils is above 97%, indicating superior oil/water separation performance. Most importantly, the modified membrane can maintain underwater superoleophobicity even in corrosive aqueous media, including strongly acidic, strongly alkaline, and highly saline solutions. It is expected that the chitosan–TiO2 composite membrane can be potentially useful in treating oily wastewater from industry and daily life.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhaoqian Li,Mengyu Qi,Chunyan Tu,Weiping Wang,Jianrong Chen,Ai-Jun Wang
The extensive usage of chlorotetracycline (CTC) has caused the persistence of antibiotic residues in aquatic environments, resulting in serious threat to human health and ecosystems. In this study, graphene oxide/titanium dioxide (GO/TiO 2 ) nanocomposite was successfully synthesized via in situ hydrolysis of tetra- n -butyl titanate (Ti(BuO) 4 ) to TiO 2 particles on GO sheets and used as adsorbent for efficient adsorptive removal of CTC from aqueous solution. The prepared GO/TiO 2 was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transformed infrared (FT-IR), Raman spectroscopy and X-ray photoelectron (XPS). Adsorption kinetics, isotherms and thermodynamics were systematically investigated to evaluate the adsorption properties of GO/TiO 2 . Adsorption mechanism was further analyzed by FT-IR, UV–vis and XPS. The results indicated that adsorption kinetics closely followed the pseudo-second order model; the maximum adsorption capacity determined by Langmuir model was 261.10 mg g −1 at 298 K and the thermodynamic studies revealed that the adsorption of CTC onto the GO/TiO 2 was a spontaneous and endothermic process. Moreover, the interactions between CTC and GO/TiO 2 were presumed to be ligand exchange between CTC and TiO 2 , while the π-π electron donor-acceptor interaction, hydrogen bond and cation-π bonding were constructed between CTC and GO. Finally, the prepared GO/TiO 2 was successfully applied for the efficient removal of CTC from Wu River water.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 34
·期 3
·1600323
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IF 4.367
Liwei Zhao,Hongbo Xu,Bo Jiang,Yudong Huang
Recently, there is crucial interest in the design and fabrication of nanocatalysts for efficient decomposition of organic pollutants in wastewater using visible light. This work reports the assembling fabrication of synergetic photocatalytic Au/TiO 2 /RGO nanostructures by utilizing the reduced graphene oxide (RGO) as substrate material and efficient separator for electrons and holes. The Au/TiO 2 nanostructures with a ≈7 nm TiO 2 particles size are dispersed uniformly on RGO nanosheets. UV–vis diffuse reflectance spectroscopy verifies that Au/TiO 2 /RGO nanocomposites show strong absorption of visible light. The degradation efficiency after 1 h for hydroquinone under visible light and UV light is ≈77% and ≈90%, respectively. Under visible light, the calculated apparent rates ( k ) of the Au/TiO 2 /RGO nanocomposites are 0.0112 and 0.0174 min −1 for decomposition of methylene blue and hydroquinone. That are five times greater than that of bare TiO 2 . The high photocatalytic activity is mainly attributed to the synergy between RGO and Au/TiO 2 nanostructure. The strategy of composite nanostructures assembling on RGO is ensured to have a great practicable potential for the designing of high efficient multielement composite nanoparticles catalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 18
·13770-13779
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IF 2.019
Jiang Liyang,Qi Jiqiu,Sui Yanwei,Liu Xiaofeng,He Yezeng,Meng Qingkun,Wei Fuxiang,Sun Zhi,Jin Yunxue
We reported a facile route for the fabrication of Al-doped TiO 2 nanostructure for supercapacitor electrode materials through an in-situ oxidation of Ti–8Al alloy. Ti–8Al alloy was prepared through solidification route. After high-temperature oxidation, rod-like and wall-like Al-doped TiO 2 composites were formed on the surface of Ti–8Al alloy flake. This kind of novel structure consisted of numerous nanorods and nanosheets, exhibiting large open space. When applied for supercapacitor, Al-doped TiO 2 composites electrode materials exhibited excellent electrochemical performance. After oxidation at 650 °C for 100 h, the electrode can deliver the highest capacitance of 4650 μF cm −2 at the current density of 10 μA cm −2 as well as long-term cycling stability of 98.5% of the initial specific areal capacitance after 6000 cycles.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Ailan Qu,Xinmei Xu,Haolong Xie,Yangyu Zhang,Yuyu Li,Junxian Wang
A composite of graphitic carbon nitride and TiO 2 (g-C 3 N 4 /TiO 2 ) with enhanced photocatalytic hydrogen evolution capacity was achieved by calcining melamine and TiO 2 sol-gel precursor. Characterization results reveal that heating temperature had a great influence on the structure, surface area and properties of the composites. Compared with the polycondensation of pure melamine, the presence of TiO 2 precursor can promote the formation of melon at a low temperature. The highest photocatalytic activity of g-C 3 N 4 /TiO 2 (400) was achieved when the calcination was performed at 400 °C, exhibiting H 2 production rate of 76.25 μmol/h under UV–vis light irradiation (λ > 320 nm) and 35.44 μmol/h under visible light irradiation (λ > 420 nm). The highest photocatalytic performance of g-C 3 N 4 /TiO 2 (400) can be attributed to: (1) the strong UV–vis light absorption due to the narrow bandgap caused by synergic effect of TiO 2 and g-C 3 N 4 , (2) high surface area and porosity, (3) the effective separation of photo-generated electron-holes owing to the favorable heterojunction between TiO 2 and g-C 3 N 4 .
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APPLIED THERMAL ENGINEERING
·
2017
·
IF 3.444
Haoran Li,Yurong He,Ziyu Liu,Yimin Huang,Baocheng Jiang
Research in collection and conversion of solar energy has attracted an increasing interest because of the fact that conventional energy resources are becoming increasingly exhausted. For this reason, Ag@TiO 2 core–shell nanoparticles (NPs) with great absorptivity in the visible region were synthesized in this work. Subsequently, an experimental study on photo-thermal performances including steam generation and solar energy capture in a thermal receiver containing the Ag@TiO 2 NPs-based nanofluids was conducted. The effects of the NP concentration as well as the optical concentration were taken into consideration. The results showed that the nanofluids can be used for direct steam generation with a short period of solar irradiation time, even at the illumination intensity of 1 sun (1 sun = 1 kW/m 2 ). An evaporation efficiency of 53.6% can be achieved when the NP concentration is only 200 ppm owing to local heating induced by the surface plasmon resonance of the NPs. In addition, it is found that the nanofluid with a lower NP concentration has a higher temperature rise during illumination. Our findings also showed that the absorbed solar energy is transferred preferentially into latent heat enthalpy and consumed for steam generation instead of heating the nanofluids.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Jing Zhao,Yanyang Yang,Yu Li,Liang Zhao,Hao Wang,Guolin Song,Guoyi Tang
Microcapsules with thermal energy storage and UV-shielding functions were successfully prepared by the method of suspension-like polymerization in order to reduce the damage of ultraviolet light . The bifunctional microcapsules (MPCMs/TiO 2 ) consist of n-octadecane as core material and poly (methyl-methacrylate) (PMMA) doped with titanium dioxide nanoparticles as shell material. The scanning electronic microscope (SEM) micrographs and particle size distributions showed that the as-prepared microcapsules are spherical and about 10–20 µm in average diameter. It was confirmed by Fourier transformation infrared spectroscope (FTIR) and energy dispersive spectrometer (EDS) spectra that modified TiO 2 nanoparticles had been well fixed in the cross-linked network structure of PMMA shell. In addition, the results of differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and ultraviolet visible spectrophotometer (UV–vis) measurements demonstrated that the microcapsules exhibited high thermal storage capability, good thermal reliability and stability, and good UV-shielding property. The resultant samples of MPCMs/TiO 2 may become the potential materials in the advanced applications of intelligent textile .
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