APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Zheng Jin,Wei Duan,Wubiao Duan,Bo Liu,Xidong Chen,Feihua Yang,Jianping Guo
The commercially available TiO 2 Degussa P25 was modified using a simple technique to produce a visible-light-actived indium and carbon doped P25 catalyst. The modified photocatalysts have been successfully obtained by thermal heating method. These as-obtained products were successfully characterized by X-ray diffraction (XRD), X-ray photoelectrion spectroscopy (XPS), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy respectively. The photocatalytic activities of all prepared catalysts were evaluated by the degradation of organic dyes including methylene blue (MB) and Reactive Red 4 (RR4) under visible light irradiation. As the result shown, the indium and carbon co-doped on P25 nanocomposites possessed the extended light absorption in visible light and better charge separation capability as compared to the pristine P25. The optimum loading of In 3+ ions on P25 was 15%. Moreover, 15% In 2 O 3 /C-P25 showed the highest degradation rate of organic dye, which the removal efficiency can reach over 90% after 90 min and the corresponding hydrogen evolution rate of 15% In 2 O 3 /C-P25 was 9 times than P25. It was concluded that the synergistic effects of In 3+ ions and carbon narrowed the band gap of TiO 2 and promoted charge separation, which played a significant role for the enhancement of photoactivity. In addition, it was observed that the photo-degradation for all catalysts followed the first order reaction kinetics. Furthermore, the influence of initial pH values on the photocatalytic degradation of MB and RR4 using 15% In 2 O 3 /C-P25 catalyst was also investigated. Finally, the stability test of photocatalysts was carried out and the photocatalytic mechanism was explained concretely.
研究领域:
材料科学
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环境科学
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光催化技术
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2017
·
IF 2.238
Yuxian Xu,Yongjin Luo,Qingrong Qian,Baoquan Huang,Qinghua Chen
Visible-light-induced BiOCl/Bi/P25 composite materials were prepared via a hydrothermal method , and evaluated by degradation of methyl orange (MO) aqueous solution. It exhibits the highest photocatalytic efficiency, which is 53.6 and 23.9 times higher than that of Bi/BiOCl and P25, respectively. The superior activity is attributed to the surface plasmon resonance (SPR) of metallic Bi , and the efficient separation of the photogenerated carriers with the aid of BiOCl/P25 heterostructure . In the photodegradation process, holes (h vb + ) can react with Cl − ions to form Cl radicals, both of which can oxidize MO. Then Cl radicals reduce to Cl − again, forming a circulation and improving the photocatalytic activity .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yu Huang,Xinyang Xu,Fengkun Han,Xi Chen,Guangjian Fan
Photocatalytic technology holds promising prospects for remediating naphthalene pollution in water bodies. In this work, the CN/Pt-P25 photocatalyst was successfully prepared via photodeposition combined with co-pyrolysis methods, and employed for naphthalene photodegradation under simulated sunlight. The chemical state of Pt was found to have a significant impact on the photocatalytic activity. H 2 secondary annealing effectively tuned Pt chemical states, increasing the proportion of Pt 0 species on the CN/Pt-P25 photocatalyst from 41.91 % to 62.24 %. The improved proportion of Pt 0 species proportion led to a reduction in the bandgap, which induced changes in the band positions and notably enhancing the separation efficiency of photogenerated electron-hole pairs. Under simulated sunlight irradiation, (H 2 ) CN/Pt-P25 photocatalyst achieved complete naphthalene photodegradation within 100 min. Thus, photocatalysts containing a high proportion of Pt 0 species exhibited an improved performance in naphthalene photodegradation. These findings provide new insights into the application of photocatalytic technology for the remediation of PAHs.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jin Xu,Chengzhuo Yu,Silong Wang,Li Xiong,Fanglan Geng,Jitao Lv,Lixia Zhao,Yawei Wang
Reactive oxygen species (ROS) generation and utilization were the foundation for the photocatalytic degradation of pollutants or anti-bactericidal effect. Especially for solid-phase film photocatalysis , a simple and firm immobilization method that ensured exposure of active sites and effective production of ROS was the key. Presently, a P25 network films was achieved using water-based polyurethane acrylate (WPUA) as adhesive through a simple and convenient direct spraying method. The physical and chemical properties of the P25 network films were characterized and the results showed that P25 was firmly adhered on the metal wire mesh and fully exposed the active sites of P25. Dynamic generation of ROS on 304SS@P25 films interface was systematically investigated. The concentration of hydroxyl radicals (•OH), superoxide radicals (O 2 •− ) and hydrogen peroxide (H 2 O 2 ) on 10 cm × 3 cm 304SS@P25 after 2 h of UV irradiation were 9.4 ± 0.3 × 10 −9 M, 7.6 ± 0.3 × 10 −9 M, and 11.7 ± 0.9 × 10 −6 M, respectively, which was similar with ROS generation of P25 nanoparticle suspensions. In addition, the ROS-mediated antibacterial effect of 304SS@P25 films was investigated, and a linear correlation was found between the concentration of ROS generated and the E. coli sterilization rate. Furthermore, 304SS@P25 films could be successfully applied in the air sterilizer to exhibit a good bactericidal effect. This ROS-oriented photocatalyst immobilization method opened up a new pathway for water and air purification and provided a new strategy in the field of photocatalytic antibacterial technology .
研究领域:
环境科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 25
·12944-12949
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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.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2017
·
IF 2.865
Xiang Guo,Lei Rao,Peifang Wang,Chao Wang,Yanhui Ao,Tao Jiang,Wanzhong Wang
TiO 2 films have received increasing attention for the removal of organic pollutants via photocatalysis . To develop a simple and effective method for improving the photodegradation efficiency of pollutants in surface water , we herein examined the preparation of a P25-TiO 2 composite film on a cement substrate via a sol–gel method. In this case, Rhodamine B (RhB) was employed as the target organic pollutant. The self-generated TiO 2 film and the P25-TiO 2 composite film were characterized by X-ray diffraction (XRD), N 2 adsorption/desorption measurements, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and diffuse reflectance spectroscopy (DRS). The photodegradation efficiencies of the two films were studied by RhB removal in water under UV (ultraviolet) irradiation. Over 4 day exposure, the P25-TiO 2 composite film exhibited higher photocatalytic performance than the self-generated TiO 2 film. The photodegradation rate indicated that the efficiency of the P25-TiO 2 composite film was enhanced by the addition of the rutile phase Degussa P25 powder. As such, cooperation between the anatase TiO 2 and rutile P25 nanoparticles was beneficial for separation of the photo-induced electrons and holes. In addition, the influence of P25 doping on the P25-TiO 2 composite films was evaluated. We found that up to a certain saturation point, increased doping enhanced the photodegradation ability of the composite film. Thus, we herein demonstrated that the doping of P25 powders is a simple but effective strategy to prepare a P25-TiO 2 composite film on a cement substrate, and the resulting film exhibits excellent removal efficiency in the degradation of organic pollutants.
研究领域:
材料科学
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环境工程
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光催化
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无机非金属材料
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表面化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Qinglong Zeng,Xiaofeng Xie,Xiao Wang,Guanhong Lu,Haiwei Li,Shun Cheng Lee,Jing Sun
Although coupling reduced graphene oxide (RGO) with TiO 2 is believed to enhance the photocatalysis through the light utilization, studies on its photothermal conversion effect are rarely reported. Herein, RGOP (reduced graphene oxide/P25) was synthesized to explore roles of the enhanced light adsorption and photothermal conversion in the photocatalytic process. It was found that although RGOP had increased absorbance, it actually possessed lower available light utilization compared with P25. In the synergistic effect of available light utilization, transfer resistance and hydrophilicity, RGOP exhibited less superoxide radicals but more hydroxyl radicals. In the presence of scavenger experiments, O 2 − was proved to play the predominant role in the photocatalytic process, while OH was the secondary one. In comparison to P25, the change of active radicals of RGOP was adverse to its photocatalysis. However, due to the superior adsorptive property of RGOP, it exhibited higher photocatalytic activity than P25. The improved photocatalytic activity of RGOP was ascribed to its superior adsorptive ability aside from active radicals ( O 2 -, OH).
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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2017
·Vol. 43
·期 1
·423-432
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IF 0.865
Yamani Zain Hassan
While most technologists use lamp light for the evaluation of catalysts synthesized for photocatalytic processes, some researchers prefer laser light. To conform in judgement, a comparative study of photocatalytically degrading methylene blue is reported, using a model catalyst Degussa P25, under different energies of 355 nm pulsed laser and under lamp (visible light and broader lamp light) irradiations. The used amounts of Degussa P25 after each batch of experiments were characterized by X-ray diffractometry, BET surface area analysis, field emission scanning electron microscopy, energy dispersive X-ray spectrometry and diffuse reflectance spectroscopy. The spectral photocatalytic degradation efficiencies, between broad lamp light and UV pulsed laser light, were comparable. Larger and spherical nanoparticles formation and reduction of BET surface area were noticed under pulsed UV laser beam irradiation of Degussa P25, while such trends were not observed under lamp irradiation for similar incident light intensities. The carbon contents on the surface, even after calcination of used samples at \(500\, ^{\circ }\) C, and the red shift in absorption spectra, were recorded in Degussa P25 used samples for both pulsed UV laser and lamp photocatalysis. Moreover, no change in the phases of Degussa P25 resulted under either types of irradiations during photocatalysis evaluation.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
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表面科学
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分析化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhen Hu,Li Zhao,Wenlu Li,Shimin Wang,Binghai Dong
A composite film was prepared by mixing NaLuF 4 :Yb 3+ /Er 3+ up-conversion luminescent material with commercial P25, and a scattering layer composed of flower-like TiO 2 was added on to the composite film (UC/P25) to form a double-layer composite film (UC/P25 + FT). An AgNO 3 solution was irradiated by ultraviolet light to deposit nano-Ag particles on the prepared double-layer film, and a nano-Ag modified double-layer film (UC/P25 + FT + Ag) was finally obtained. The synergistic effect of the three improved methods conferred the UC/P25 + FT + Ag film with a wide spectral absorption range, strong light-scattering ability, and strong light absorption capability, which greatly improved the photoelectric performance of the film. The maximum photoelectron conversion efficiency of dye-sensitized solar cells with the UC/P25 + FT + Ag photoanode reached up to 8.14%, which increased by 32.36% compared with that of the pure P25 film photoelectrode .
研究领域:
材料科学
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光电子学
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能源科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziyu Xie,Jing Chen,Yanxin Chen,Tianming Wang,Xia Jiang,Yiming Xie,Can-Zhong Lu
Pd modified ZnIn 2 S 4 /P25 (Pd@ZnIn 2 S 4 /P25) heterostructures have been synthesized by hydrothermal and photo-reduction method. The H 2 evolution rate of optimal photocatalyst 0.5 %Pd modified 5ZnIn 2 S 4 /2P25 (0.5 %Pd@5ZnIn 2 S 4 /2P25) are approximately 9100 and 3693 μmol · g −1 h −1 under simulated sunlight and visible light irradiation with ethanol as the sacrificial agent, which are nearly 9 and 460 times higher than pure ZnIn 2 S 4 and P25, respectively. The promoted photocatalytic performance can be attributed to the physicochemical properties of the catalysts and the strong electronic interaction between Pd modified ZnIn 2 S 4 (Pd@ZnIn 2 S 4 ) and P25, the improved transfer rate of photo-generated electrons and holes, the inhibited recombination of charge carriers, and the enhanced light harvesting. The results of photo-electrochemistry and EPR indicate that it is a Z-scheme photocatalytic system, in which the electrons accumulate on the conduct band of ZnIn 2 S 4 and the holes assemble on the valence band of P25. This work provides an effective method to construct highly efficient photocatalytic systems for solar H 2 generation.
研究领域:
材料科学
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光化学
·
催化
·
能量转换
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Han Song,Zhenxiao Pan,Huashang Rao,Xinhua Zhong
The time-consuming transport of photo-generated electrons across conventional photoanode film, composed of disordered P25 TiO 2 nanoparticulates, is one of the main bottlenecks to improve the performance of quantum dot-sensitized solar cells (QDSCs). A convenient and effective method was developed for the preparation of high performance photoanodes based on composite paste composed of conventional P25 TiO 2 nanoparticulates and TiO 2 hierarchical nanowires (HNW) for QDSCs. The shortened transport path in the composite photoanode brings forward suppressed charge recombination processes at the interfaces between photoanode and electrolyte, and improved photovoltaic performance of the resulting solar cells. Through optimizing the composite photoanode and the adoption of N-doped mesoporous carbon/Ti counter electrodes, average power conversion efficiency of Zn-Cu-In-Se (ZCISe) QDSCs was increased from 12.77% corresponding to conventional P25 photoanodes to 13.43% ( J sc = 27.38 mA cm −2 , V oc = 0.764 V, and FF = 0.642) corresponding to photoanodes with HNW/P25 weight ratio of 0.1%. Furthermore, this composite photoanode is also effective in improving the photovoltaic performance of QDSCs under different QD sensitizers (such as Zn-Cu-In-S (ZCIS) QDs) as well as different counter electrodes (such as Cu 2 S/brass).
研究领域:
材料科学
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能源技术
·
光电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE
·
2017
·Vol. 41
·期 2
·1138-1146
·
IF 2.341
Xiu‑Yin Shen,Tao Luo,Sheng Li,Ou‑Yang Ting,Feng He,Jie Xu,Hua‑Qiao Wang
Alzheimer's disease (AD) is a common neurodegenerative disorder characterized by aberrant tau protein hyperphosphorylation, which eventually leads to the formation of neurofibrillary tangles. Hyperphosphorylated tau protein is considered as a vital factor in the development of AD and is highly associated with cognitive impairment. Therefore, it is recognized to be a potential therapeutic target. Quercetin (QUE) is a naturally occurring flavonoid compound. In the present study, the inhibitory effect of QUE on okadaic acid (OA)-induced tau protein hyperphosphorylation in HT22 cells was explored. Western blotting results indicated that QUE significantly attenuated OA‑induced tau protein hyperphosphorylation at the Ser396, Ser199, Thr231 and Thr205 sites. Further experiments demonstrated that QUE inhibited the activity of cyclin‑dependent kinase 5 (CDK5), a key enzyme in the regulation of tau protein, and blocked the Ca2+‑calpain‑p25‑CDK5 signaling pathway. These observations indicate the ability of QUE to decrease tau protein hyperphosphorylation and thereby attenuate the associated neuropathology. In conclusion, these results support the potential of QUE as a therapeutic agent for AD and other neurodegenerative tauopathies.
研究领域:
神经科学
·
药理学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）