Preparation and photocatalytic activity of rutile TiO2 and goethite composite photocatalysts

Xie, Wei; Chen, Hui; Zhang, Xuanhui; Hu, Xianchao; Li, Guohua

doi:10.1016/s1872-2067(12)60569-5

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Any electromagnetic (EM) wave transmitted through this plasma is attenuated, reflected or absorbed, causing breaks in terrestrial and spacecraft telemetry, control, and other communication links. The phenomenon is known as radio blackout [2][3][4][5][6]. To achieve uninterrupted monitoring of spacecraft reentries, researchers have proposed and tested a series of methods to mitigate blackout [7][8][9][10][11], including aerodynamic shaping, electrophilic injection or ablation, magnetic windows, high-frequency transmissions and inflatable reentry aeroshell surface catalysis effects.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of blackout problem for reentry vehicle in traveling magnetic field with induced current

Guo

Xie

Sun

et al. 2020

Plasma Sci. Technol.

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In this paper, a novel solution mitigating the radio blackout problem is proposed, which improves existing traveling magnetic field (TMF)-based methods. The most significant advance lies in replacing the external injection with self-induced current, which does not require electrodes. The improved analytical model is derived to evaluate the electron density reduction taking into consideration the self-induced current for various TMF velocities. The plasma reduction performance is analyzed for several conditions including the total absence of injected current. The results show that the velocity may be used to trade off the injected current and, when sufficiently large, eliminates the need for an injected current while mitigating radio blackout. The effectiveness of this solution to the blackout problem is demonstrated in commonly used aerospace communication bands. With a field strength of less than 0.15 T, increasing the velocity from 40 m s −1 to 3100 m s −1 is all that is required to obviate the need for an injected current. Moreover, typical reduction ratios for electronic density tolerance (2, 1.9, 1.75 and 3 times for the L-, S-, Cand X-bands, respectively, at an altitude of 40 km) remain unchanged. Increasing the velocity of the TMF is much easier than injecting current via a metal electrode into a high-temperature flow field. The TMF method appears practical in regard to possible future applications.

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Section: Introductionmentioning

confidence: 99%

Mitigation of blackout problem for reentry vehicle in traveling magnetic field with induced current

Guo

Xie

Sun

et al. 2020

Plasma Sci. Technol.

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“…Goethite (FeOOH) containing semiconductor materials had been proved to be a promising method to enhance the photocatalytic efficiency of photocatalysts [13]. Xie et al [14] improved the photocatalytic efficiency of methylene blue dye by designing TiO 2 /FeOOH catalysts, in which iron ions were doped into the rutile TiO 2 lattice to form iron-doped rutile TiO 2 tube's structure.…”

Section: Introductionmentioning

confidence: 99%

Catalytic degradation of gaseous benzene by using TiO2/goethite immobilized on palygorskite: Preparation, characterization and mechanism

Zhu

et al. 2015

Solid State Sciences

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“…Among the semiconductors, TiO 2 nanoparticles are one of the most used photocatalysts for a lot of organic pollutant degradation due to their suitable band gap energy, photoand chemical stability, non-toxicity, and low cost [1][2][3][4][5][6]. TiO 2 is used as a good photocatalyst under UV illumination, but its solar energy utilization is limited due to its wide band gap and short lifetime of photoinduced charge carriers [7,8]. Although anatase TiO 2 is generally accepted as the most photoactive, the lower band gap of rutile than anatase and its thermodynamic stability enhances its photoabsorption properties under visible light illumination [9].…”

Section: Introductionmentioning

confidence: 99%

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Yener

Helvacı

2015

Appl. Phys. A

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Rutile TiO 2 nanoparticles, in different structural and morphological properties, were produced by the hydrolysis of titanium tetrachloride in a highly acidic reaction media at moderate temperatures without calcination. Their photocatalytic activities were investigated in the liquid-phase degradation of terephthalic acid under visible light illumination. The parameters, which are the concentration of the titanium tetrachloride solution (0.1-1 M) and reaction temperature (60-95°C), effective on the properties of the particles, and their photocatalytic performances, were investigated. The XRD patterns indicated a pure rutile crystal structure at moderate temperatures without need of calcination. The FEGSEM images showed the formation of flower-, pinecone-, and sphere-like clusters consisting of interconnected nanofibers. The N 2 adsorption-desorption isotherms pointed out the microporous structure of the clusters. Band gap energies were found to be varying between 3.02 and 3.08 eV due to the well-developed rutile crystallite structure. Systematic studies elucidated that the optimum reactant concentration and reaction temperature are 0.5 M TiCl 4 and 95°C, respectively. The rutile clusters synthesized at the optimum reaction conditions exhibited 99 % of the photocatalytic degradation of TPA under visible light illumination at shorter irradiation times compared with commercial P25 TiO 2 .

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Preparation and photocatalytic activity of rutile TiO2 and goethite composite photocatalysts

Cited by 8 publications

References 32 publications

Mitigation of blackout problem for reentry vehicle in traveling magnetic field with induced current

Mitigation of blackout problem for reentry vehicle in traveling magnetic field with induced current

Catalytic degradation of gaseous benzene by using TiO2/goethite immobilized on palygorskite: Preparation, characterization and mechanism

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

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