SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
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.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Nuoxin Xu,Liang Hu,Qilong Zhang,Xingrong Xiao,Hui Yang,Enjie Yu
In this study, we report a feasible strategy for fabricating high-dielectric-constant polymer composites for applications in energy storage devices and embedded capacitors. Hierarchical flower-like TiO2 particles were prepared via a facile solvothermal process and incorporated into the P(VDF-HFP) matrix. The temperature and frequency dependent dielectric properties of flower-like TiO2/P(VDF-HFP) composites as well as commercial TiO2/P(VDF-HFP) composites were investigated. The results reveal that the flower-like TiO2 particles are more effective in increasing the dielectric constant of P(VDF-HFP) when compared with commercial TiO2. Typically, the dielectric constant of the P(VDF-HFP) composite filled with 20 vol % flower-like TiO2 reaches 83.1 at 100 Hz, in contrast to 43.4 for the composite filled with 20 vol % commercial TiO2 and 11.3 for pristine P(VDF-HFP). Also, the flower-like TiO2-filled composites exhibit similar characteristic breakdown strengths to their commercial TiO2-filled counterparts. The significant improvement in the dielectric constant could be attributed to the enhancement of Maxwell–Wagner–Sillars polarization, which originates from the sophisticated morphology of flower-like TiO2 particles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jun Dai,Juan Yang,Xiaohan Wang,Lei Zhang,Yingjie Li
Wirelike catalysts of mixed-phase TiO 2 (B)/anatase TiO 2 , bare anatase TiO 2 and TiO 2 (B) are synthesized via calcining precursor hydrogen titanate obtained from hydrothermal process at different temperatures between 450 and 700 °C. Under visible light irradiation, mixed-phase TiO 2 (B)/anatase TiO 2 catalysts exhibit enhanced photocatalytic activity in comparison with pure TiO 2 (B) and anatase TiO 2 toward selective oxidation of benzylamines into imines and the highest photocatalytic activity is achieved by TW-550 sample consisting of 65% TiO 2 (B) and 35% anatase. The difference in photocatalytic activities of TiO 2 samples can be attributed to the different adsorption abilities resulted from their crystal structures and interfacial charge separation driven by surface-phase junctions between TiO 2 (B) and anatase TiO 2 . Moreover, the photoinduced charge transfer mechanism of surface complex is also proposed over mixed-phase TiO 2 (B)/anatase TiO 2 catalysts. Advantages of this photocatalytic system include efficient utilization of solar light, general suitability to amines, reusability and facile separation of nanowires catalysts.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2014
·
IF 1.761
Sheng-ying Ye,Sheng-wen Shen,Lu-meng Ye,Xian-liang Song,Shu-can Luo
Silver nanoparticles (AgNPs), obtained by reduction from AgNO 3 solution and stabilized in polyvinyl pyrrolidone (PVP), have been synthesized by γ-ray radiolysis . The application of photoelectrocatalytic (PEC) oxidation in ethylene gas treatment using a TiO 2 photocatalyst combined with as-prepared AgNPs on activated carbon fiber (ACF) ([Ag+TiO 2 ]/ACF) as a photoelectrode in a Nafion-based photoelectrocatalytic cell is presented. The effects on the PEC degradation of C 2 H 4 of the preparation parameters of the AgNPs, such as the radiation dose and the amount of PVP added, have been systematically investigated. Emphasis is placed on comparison of the C 2 H 4 decomposition rate constant with [Ag+TiO 2 /ACF] as a photoelectrode in a photoelectrocatalytic cell with that achieved with [TiO 2 /ACF]. The factors responsible for the enhancing effect of AgNPs on the PEC activity of the [Ag+TiO 2 /ACF] photoelectrode are discussed.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 63
·33408-33415
·
IF 3.708
Fang Cui,Linxu Xu,Tieyu Cui,Tongjie Yao,Jing Yu,Xiao Zhang,Kening Sun
In this paper, we demonstrate a facile and scalable route to the preparation of composites containing ultrasmall TiO2 nanocrystals and porous carbon matrix. In this method, the titanium ions are covalently introduced to polymer chains and transformed into TiO2 nanocrystals directly in solid matrices, which allows the generation of well dispersed TiO2 nanocrystals with small size in the entire carbon matrix. To our knowledge, this is the first time that ultrasmall TiO2 nanocrystals are incorporated into a bulk porous carbon matrix. In comparison with pure TiO2 particles, the composites exhibit significant improvement in photocatalytic degradation of methyl blue under visible light irradiation, which might be attributed to the ultrasmall size of TiO2 nanocrystals as well as the high separation efficiency of photogenerated electrons and holes based on the synergistic effect between TiO2 nanocrystals and carbon matrices. Furthermore, the composites could be easily recycled without obvious activity loss.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2013
·
IF 1.527
Yan-Fang Li,Wen-Pei Zhang,Xiangru Li,Ying Yu
Particular TiO 2 nanoparticles with high selective photocatalytic oxidation of anionic dyes are prepared by a feasible hydrothermal method . Moreover, its photocatalytic selectivity can be easily switched to cationic dyes by a simple post-treatment in ammonia solution, which makes the prepared TiO 2 have bi-directional selectivity in dye photodegradation. Based on the photocatalytic performances and the structure and surface characteristics of the catalyst, the bi-directional selectivity of the catalysts is found to be closely related to the adsorption selectivity. The adsorption selectivity originates from surface charge groups, which are introduced during the preparation and post-treatment progresses. This study provides a facile and economical approach towards selective degradation of dyes with high efficiency by the special TiO 2 nanoparticles synthesized through a simple hydrothermal method , which may be used practically in the future.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 4
·1328-1332
·
IF 1.821
Xiaoyan Yang,Jingyu Li,Junliang Fu
In this article, a label-free photoelectrochemical immunosensor based on a CdS-modified mesoporous TiO2 film has been developed. The CdS quantum dots could be deposited onto the mesoporous TiO2 film by electrochemical deposition, which could enhance the photocurrent intensity in the visible region. Employing specific binding of antigen–antibody, α-fetoprotein (AFP) could be captured on the surface of the modified electrode. Based on the steric hindrances, the photocurrent intensity decreased with the increase in AFP concentration. A linear response from 0.05 ng mL−1 to 20 ng mL−1 was obtained for AFP detection and the detection limit was 0.02 ng mL−1. Moreover, the practical determination of AFP in human serum was also investigated.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Zhiqiao He,Qiaolan Cai,Ming Wu,Yuanqiao Shi,Huiying Fang,Lingdan Li,Jiancheng Chen,Jianmeng Chen,Shuang Song
In the present work, reduction of Cr(VI) induced by UV–visible light in aqueous solution was investigated. The aqueous medium contained TiO2 nanosheets and no additional reducing agents or hole scavengers. A hydrothermal method was used to synthesize fluorinated TiO2 nanostructures with various percentages of exposed {001} facets and initial F/Ti ratios. Fluorine-free TiO2 nanosheets were obtained by washing the TiO2 samples with NaOH solution. The surface fluorination facilitates the adsorption process by increasing the number of surface OH groups generated. Moreover, fluorination efficiently inhibits the recombination of photogenerated electron–hole pairs. The {001} facets have an indirect role in the photocatalytic reduction of Cr(VI) because oxidative dissolution of H2O occurring on {001} facets and Cr(VI) reduction occurring on {101} facets are simultaneous reactions. The optimal ratio of exposed {001} to {101} was found to be ∼72:18.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Iranian Chemical Society
·
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.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Hao Zhao,Fengxian Qiu,Jie Yan,Jie Wang,Xin Li,Dongya Yang
A novel economical and environmentally friendly graphene/palygorskite/TiO 2 (GR/Pal/TiO 2 ) composites adsorbent was prepared and characterized by X-ray diffractometry (XRD), Fourier transform infrared (FTIR), N 2 adsorption/desorption isotherms, transmission electron-microscopy (TEM) and scanning electron microscopy (SEM). The GR/Pal/TiO 2 was applied to removal dye methylene blue (MB) and the optimum conditions of adsorption were investigated. The obtained results indicated that when the dosage of GR/Pal/TiO 2 , reaction temperature and time of the composite are 15 mg/mL, 40 °C and 1 h, respectively, the adsorption efficiency can reach 100%. The adsorption kinetic of MB followed the pseudo-second-order model while the adsorption isotherm confirms to the Langmuir model. The adsorption process is spontaneous and endothermic by thermodynamic study. Compared with other different reported materials, the novel GR/Pal/TiO 2 composite exhibits a high adsorption ability for MB removal. The obtained results demonstrate that the prepared GR/Pal/TiO 2 composites are very promising material for the removal of MB from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Peng Wang,Danzhen Li,Jing Chen,Xiaoyun Zhang,Jiangjun Xian,Xue Yang,Xiuzhen Zheng,Xiaofang Li,Yu Shao
In this paper, a facile and green method was employed to synthesize CdSe quantum dots (QDs)-modified TiO 2 . It exhibited much higher photocatalytic activities than both TiO 2 and bulk CdSe-modified TiO 2 on degrading malachite green (MG) aqueous solution under visible light irradiation. The vital role that quantum size effect of CdSe QDs plays in enhancing photocatalytic properties of CdSe QDs-modified TiO 2 is discussed in detail for the first time. Due to the more negative conduction band potentials of CdSe QDs than that of bulk CdSe, the electron transfer rate from CdSe QDs to TiO 2 is much faster than that from bulk CdSe to TiO 2 , which would be beneficial for an efficient charge carrier's separation. As a result, more quantities of active species (O 2 • − , H 2 O 2 , •OH) are generated during the photocataltytic reaction in CdSe QDs-modified TiO 2 system. This work could not only provide a facile and green strategy to fabricate semiconductor QDs-modified TiO 2 photocatalyst but also contribute to a deeper understanding of the specific role of semiconductor QDs during the photocatalytic reaction process.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Juangang Wang,Tiedan Chen
In this paper, we present a method to prepare interconnected TiO 2 nanowires consisting of nanosized crystallites (INCNCs). A high light-to-electricity conversion yield of 8.20% was achieved by applying the structure of the thin INCNCs electrode film in DSSC with gel electrolyte, much higher than 6.84% of TiO 2 nanoparticulate film with same thickness (6.5 μm).
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）