SCIENCE OF THE TOTAL ENVIRONMENT
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2017
·
IF 4.9
Jing Lu,Shengyan Tian,Xiaohui Lv,Zuohong Chen,Baiyang Chen,Xiaoshan Zhu,Zhonghua Cai
The impact of manufactured nanoparticles on the toxicity of co-existing pollutants in aquatic environments has raised increasing concerns. However, the toxicity of polycyclic aromatic hydrocarbons or metal ions in the presence of titanium dioxide nanoparticles (nTiO 2 ) to marine zooplankton has been rarely reported. In the present study, the impacts of nTiO 2 on the toxicity of phenanthrene (Phe) and cadium (Cd 2 + ) to Artemia salina , a model marine zooplankton, were investigated. Although nTiO 2 alone exerted a limited toxicity to A. salina within 48 h of exposure, nTiO 2 strongly altered the toxicity of Phe and Cd 2 + to A. salina . Compared with the individual toxicities of pollutants to A. salina , the toxicities of Phe and Cd 2 + increased by 2.0% and 12.2%, respectively, in the presence of 5 mg/L nTiO 2, but decreased by 24.5% and 57.1%, respectively, in the presence of 400 mg/L nTiO 2 . These concentration-dependent impacts of nTiO 2 on the toxicity of Phe or Cd 2 + might be attributed to the concurrent functions of several interrelated factors including the adsorption of pollutants on nTiO 2 , the nTiO 2 -faciliated bioaccumulation of pollutants, the limited gut volume in organisms, and the aggregation and sedimentation behaviors of nTiO 2 . These results presented in the study could help understand the effects of manufactured nanomaterials in marine environments.
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PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yaling Li,Ji Zhou,Yunde Fan,Yong Ye,Bin Tang
We fabricated a low-cost and efficient composite photocatalyst material, combining eggshell membrane (ESM) and titanium dioxide (TiO 2 ) nanoparticles, through self-assembly method. ESM with 3D porous structures provide scaffolds for TiO 2 nanoparticles. Polyethyleneimine (PEI) was used to modify ESM by grafting amine groups. The microstructure and property of the fabricated composites were studied by various characterization methods. The composite was used for the photodegradation of Rhodamine B (RhB). The results demonstrate that the composite catalyst possesses good photocatalytic performance for dye degradation under sunlight irradiation simulated by a xenon lamp. Functionalization based on nanomaterials may promote the applications of ESM.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Xike Tian,Lin Liu,Yong Li,Chao Yang,Zhaoxin Zhou,Yulun Nie,Yanxin Wang
Detection of pesticides in ground water has become a very important and crucial research area due to the rapid expansion of agriculture and stringent environmental protection acts. In this paper, the as-prepared CuO-TiO 2 hybrid nanocomposites were decorated on the glass carbon electrode as the nonenzymatic electrochemical nanosensor for the sensitive and selective detection of methyl parathion. The electrochemical behavior of the modified electrode was investigated by cyclic voltammetry, showing that the modified electrode can be used for methyl parathion detection. Differential pulse voltammetry was applied to evaluate methyl parathion detection ability under optimized experimental conditions, and found the modified electrode can detect methyl parathion sensitively in a wide dynamic detection range from 0 ppb to 2000 ppb with a lower limit of detection (LOD) of 1.21 ppb. In addition, other interfering materials have no any influences on the detection of methyl parathion. Furthermore, the modified electrode has also been used for methyl parathion detection in the actual ground water samples, and showed efficient sensing ability. The electrochemical sensor developed would have great potentiality for methyl parathion sensing and provide new insights into the detection of other organophosphorous pesticides in the ground water.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 75
·40019-40028
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IF 3.708
Wei Zhong,Ying Yu,Chun Du,Wei Li,Yinzhen Wang,Guannan He,Yuandong Xie,Qinyu He
Buoyant photocatalysts which are able to remove organic pollutants under all lighting and weather conditions are in demand for the treatment of large volumes of organic wastewater. Buoyant carbon and nitrogen co-doped TiO2/polytetrafluoroethylene (NCT/PTFE) flakes which meet these requirements were prepared by the high-energy ball-milling of NCT powder and PTFE. The physicochemical properties of the as-prepared composite flakes were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible diffuse reflection spectroscopy (UV-vis DRS), Brunauer–Emmett–Teller (BET) surface area determination, and X-ray photoelectron spectroscopy (XPS), as well as electrical conductivity and density measurements. The density of the composite flakes was 0.93 g cm−3, slightly lower than that of water, rendering them buoyant. And the used-and- regenerated (by UV-vis irradiation for 8 h) flakes are also buoyant. Adsorption in the dark and photodegradation experiments indicated that the as-prepared flakes have high dark adsorption and high photocatalytic properties. The 6 h photodegradation ratio of methylene orange (20 mg L−1, 100 mL, as a model dye) is 96.6%, and a close degradation ratio of 97% can be obtained by three-cycle dark adsorption with minor stirring (1 cycle includes 8 h dark adsorption followed by 8 h regeneration by UV-vis irradiation per cycle). The high adsorption and good photocatalytic properties can be mainly attributed to the large BET surface area resulting from the small NCT particle size. The as-prepared flakes have the potential for use in organic pollutant adsorption at any time and can be regenerated through light irradiation when sunlight is available. This kind of environmental protection material has great practical significance due to its low cost, simple preparation, thermal durability, highly efficient organic pollutant removal, large-volume treatment capacity, recyclability, and the possibility of working at any time.
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Journal of Materials Chemistry C
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2012
·Vol. 1
·期 5
·1029-1036
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IF 0
Jun Yin,Qiang Xu,Zhaogen Wang,Xueping Yao,Yong Wang
Sequential vapour infiltration operated in an atomic layer deposition (ALD) reactor was used to controllably deliver precursors of TiO2 into the cores of micellar films of the amphiphilic block copolymer, poly(styrene-block-4-vinylpyridine) (PS-b-P4VP). Vaporized precursors diffused through the PS corona and were exclusively enriched into the P4VP cores. Arrays of hexagonally arranged TiO2 nanoparticles were produced by burning off the polymeric components after UV-crosslinking the TiO2-incorporated micellar films. The size of the TiO2 particles was tunable simply by repeating the cycle numbers, and the interparticle distances were dictated by the distances between neighboring micelles of the original micellar films and could be changed by using block copolymers with different molecular weights. Compared to the extensively used solution impregnation method, the sequential vapour infiltration strategy was distinct in terms of the simplicity accompanying the “dry” process and precise control in particle sizes. More importantly, growth of TiO2 particles inside micellar cores was not limited by the available pyridyl groups as TiO2 continued to grow on preformed TiO2 particles after the pyridyl groups were consumed. Consequently, the particle sizes could be tuned in a much broader range compared to the solution impregnation method in which the particle size was limited by the saturation of impregnated precursors bound to the pyridyl groups. Furthermore, we demonstrated the versatility of this sequential vapour infiltration strategy in producing nanostructures with different morphologies and chemical compositions.
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JOURNAL OF POWER SOURCES
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2012
·
IF 4.951
Wei-Wei Cui,Dong-Yan Tang,Zai-Lin Gong
An organic/inorganic hybrid nanocomposite , poly(methyl methacrylate) grafted titanium dioxide (PMMA- g -TiO 2 ), is synthesized by atom transfer radical polymerization (ATRP). The hybrid nanocomposites are incorporated into poly(vinylidene fluoride) (PVdF) membranes during the electrospinning process to fabricate a composite nanofibrous membrane. Then the resultant fibrous polymer electrolyte is obtained by immersing the composite membrane into liquid electrolyte . FTIR , TEM , TGA , GPC , SEM, XRD , and DSC are used to characterize the structure, morphology and thermal properties of PMMA- g -TiO 2 hybrid nanocomposite and the composite nanofibrous membrane. The composite nanofibrous membrane is proven to be a good absorbent for the liquid electrolyte, and it exhibits a high electrolyte uptake and a high electrolyte retention ratio. The incorporation of PMMA- g -TiO 2 into the nanofibrous membrane inhibits the crystallization of PVdF during the solidification process and improves the ionic conductivity of the fibrous polymer electrolyte from 2.51 × 10 −3 to 2.95 × 10 −3 S cm −1 at 20 °C. The electrochemical stability window of the polymer electrolyte is also enhanced due to the presence of PMMA- g -TiO 2 .
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高影响因子
Nano Energy
·
2015
·
IF 10.325
Guisheng Li,Zichao Lian,Wenchao Wang,Dieqing Zhang,Hexing Li
Size-controllable g-C 3 N 4 quantum dots (QDs) were in-situ synthesized and grafted onto single-crystalline TiO 2 nanotube arrays (TiO 2 -NTAs) based on nanotube-confinement effect. This photoelectrocatalyst exhibited high activity in synergetic H 2 evolution and organic pollutant degradation. The g-C 3 N 4 QDs, together with TiO 2 -NTAs due to multiple light reflections, promoted light harvesting owing to the narrow energy band gap and upconversion from quantum size effect of g-C 3 N 4 QDs. Meanwhile, the single-crystal TiO 2 in-situ formed during the g-C 3 N 4 synthesis process favored the photoelectron transfer, and the g-C 3 N 4 /TiO 2 heterojunctions further promoted separation of photoelectrons from holes. Moreover, the strong g-C 3 N 4 –TiO 2 interaction and the confinement effect of TiO 2 nanotubes efficiently inhibited self-gathering and leaching of g-C 3 N 4 QDs, leading to excellent stability in photoelectrocatalysis .
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高影响因子
Journal of the Iranian Chemical Society
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2015
·Vol. 13
·期 2
·331-337
·
IF 1.087
Fan Chunlei,Pan Qinhe,Li Qun,Wang Liyuan
In this work, cloud point-TiO 2 /sepiolite composites–octyl alcohol extraction combined with UV–vis spectrometry was applied to analyze nickel in real samples. Trace nickel was separated and preconcentrated with PAN as chelating agent, and TiO 2 /sepiolite composites—octylphenoxypolyethoxyethanol (TX-114)—octyl alcohol as extraction agent. Factors influencing extraction efficiency, such as concentrations of TX-114 and octanol, type of the desorption on the extraction system, concentration of chelating agent, pH, incubation temperature, incubation time and conditions of phase separation were investigated and optimized systematically. The results showed that TiO 2 /sepiolite composites exert significant effects on the extraction efficiency; especially nickel concentration is very low. Under the optimal conditions, the absorbance signal is linear with nickel concentration in the range of 0.02–3 mg L −1 and the detection limit was 5 μg L −1 . The developed method was successfully applied to the determination of nickel in natural products of Baisha green tea and coconut water in Hainan.
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RSC Advances
·
2014
·Vol. 4
·期 25
·12944-12949
·
IF 3.708
Yamin Feng,Jianhui Zhu,Jian Jiang,Wenwu Wang,Gaoxiang Meng,Fei Wu,Yongli Gao,Xintang Huang
We herein present a useful and novel strategy to redesign photoanodes by building smart TiO2 nanorod networks in and on a film of P25 nanoparticles (NPs) to optimize the comprehensive performance of dye-sensitized solar cells (DSSCs). By using a doctor-blade method followed by a facile hydrothermal treatment, an interesting hierarchical double-layered film consisting of P25 NPs and TiO2 nanorods (NRs) was fabricated on a fluorine-doped tin oxide (FTO) substrate. In our strategy, P25 NPs (underlayer) with a large surface area can potentially enable a large amount of dye absorption while TiO2 NRs (overlayer) as the scattering part would effectively strengthen the light harvesting ability. Moreover, TiO2 NRs inserted into the P25 NP film also provide conducting networks for fast photogenerated electron transport. As demonstrated in photoanodes for DSSCs, this hierarchical double-layered photoanode indeed exhibits superior DSSC performance to that of a pure P25 NP film; the photovoltaic conversion efficiency increases up to 8.62% under illumination of one sun (AM 1.5 G, 100 mW cm−2), which is significantly better than 6.12% for the pure P25 NP photoanode. This work highlights the significance of the rational design of photoanode electrodes for enhanced energy conversion applications.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2015
·
IF 5.337
Huanzhi Zhang,Yongjin Zou,Yujia Sun,Lixian Sun,Fen Xu,Jian Zhang,Huaiying Zhou
Phase-change materials (PCMs) have promising applications in the fields of solar energy storage, energy conservation in buildings , thermal insulation , and thermal regulation. In this study, novel multifunctional composite films were prepared via a thermosetting process using poly(vinyl chloride) (PVC) as a film matrix, microencapsulated PCMs (micro-PCMs) as a temperature-regulating additive and TiO 2 nanoparticles (nano-TiO 2 ) as a UV-blocking additive. The latent heat of the film fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 is 9.226 J/g. The film also shows high thermal stability, with no obvious change in thermal performance after 100 heating–cooling cycles. The temperature of a space enclosed by the film fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 can be controlled in the range 25–28 °C for 3298 s. The composite films exhibit a significantly decreased UV transmittance due to the UV absorption of nano-TiO 2 . Furthermore, the thermal conductivity of the sample fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 is 0.2356 W/(m K), which is comparable with that of a pure PVC film. These findings indicate that the novel thermal-insulating film is promising for use in energy-efficient building and automobile applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Xiaming Feng,Weiyi Xing,Lei Song,Yuan Hu,Kim Meow Liew
Titanium dioxide/graphene hybrids were synthesized by a facile in situ solvothermal route and introduced to enhance the properties of the poly(vinyl chloride) (PVC) materials. X-ray diffraction and transmission electron microscopy results indicated that TiO 2 nanoparticles were homogeneously anchored on the graphene oxide nanosheets and the reduction of graphene oxide occurred simultaneously during the one-pot solvothermal process. With the incorporation of 2.0 wt% graphene/TiO 2 hybrids, a 3.5 °C increment in the glass transition temperature and a 50% increase in the storage modulus were observed compared to neat PVC. The improvement of the temperature of maximum mass loss rate and reduction of maximum mass loss rate were also observed from thermogravimetric analysis, indicating the enhanced thermal stability of PVC composites. Moreover, the reduced peak heat release rate and HCl release rate obtained from microscale combustion calorimeter and thermogravimetric analysis-infrared spectrometry indicated the superior fire safety of PVC composites. The changes of the fire behavior were primarily attributed to the synergistic effects of graphene/TiO 2 hybrids: the adsorption and barrier effect of fillers slow down the thermal degradation of polymer, and restrain the heat transfer and the flammable or toxic gaseous products release.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Shi-Ming Wang,Lin Liu,Wei-Lin Chen,Zhong-Min Su,En-Bo Wang,Chao Li
A new H3PW12O40 (PW12)-based interfacial layer for dye-sensitized solar cells (DSSCs) has been fabricated by the LBL method. The features of the interfacial layer were tested by IR and UV–vis spectroscopies and AFM. The cells were systemically tested by the photocurrent–voltage (J–V) curve, dark-current measurement, open-circuit voltage decay (OCVD), and monochromatic incident photon-to-photocurrent conversion efficiency (IPCE) techniques. The PW12-based interfacial layer was found to accelerate electron transfer and retard recombination, eventually leading to an efficient increase in energy conversion efficiency. The investigations indicate that the energy conversion efficiency of a (PW12/TiO2)3-based DSSC is significantly enhanced by 54% at 100 mW cm–2 compared with a DSSC with no treatment and by 20% compared with a TiCl4-treatment DSSC. Polyoxometalate was first introduced into the interfacial layer in modifying the photoanode to accelerate electron transfer and retard recombination to improve DSSC efficiency in this work.
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高影响因子
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