Uniform carbon-covered titania and its photocatalytic property

Li, Lin; Lin, Wei; Zhu, Yuelin; Zhao, Bo; Xie, Yongbing; He, Yonghong; Zhu, Yongfa

doi:10.1016/j.molcata.2005.04.028

Cited by 76 publications

(48 citation statements)

References 37 publications

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“…For this purpose many of the carbon precursors can be used, such as: n-hexane (2-4), poly(vinyl alcohol) or poly(ethylene terephthalate) (5-9), citric acid (10), cellulose (11)(12), glucose (13), sucrose (14)(15), poly(divinylbenzene) (16) and formaldehyde polymers (17)(18)(19)(20). Commonly used method to introduce carbon into TiO 2 lattice is thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

Kusiak-Nejman¹,

Wanag²,

Kowalczyk³

et al. 2015

Journal of Advanced Oxidation Technologies

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Abstract:In this study a photocatalytic performance of new carbon-modified titanium dioxide photocatalysts was discussed. Benzene was used as carbon precursor. It was found that the photocatalytic activity of obtained samples increases with the increase of modification temperature and decrease of carbon concentration present in TiO 2 /C samples. This could be related to the kind of interactions between TiO 2 surface and carbon from thermal decomposition of benzene. The higher calcination temperature the less carbon deposits on the surface of modified samples and the higher probability of the Ti and C interaction confirmed by means of UV-vis/DR studies. It was proved that the photocatalytic activity of carbon modified titania nanomaterials strongly depends on carbon content in TiO 2 /C photocatalysts. Modification of starting TiO 2 with benzene is a promising method especially by taking into account the mineralization of phenol and the co-products of its degradation.

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Section: Introductionmentioning

confidence: 99%

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

Kusiak-Nejman¹,

Wanag²,

Kowalczyk³

et al. 2015

Journal of Advanced Oxidation Technologies

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“…In our previous paper, it has been proved that sucrose can disperse onto the surface of alumina [5,6,8] and titania [7] to form a monolayer, and the threshold is about 0.38 g sucrose/100 m 2 TiO 2 . The surface area of titania in our present work is about 97 m 2 g −1 (Table 1), sucrose is monolayerdispersed on the surface of titania when its content is lower than 0.37 g sucrose/g TiO 2 .…”

Section: The Physicochemical Properties Of C/tio 2 Compositesmentioning

confidence: 99%

“…MB and RB degrade by an apparent zero-order kinetics in the presence of pure titania powder, while by an apparent first-order kinetics on CCT. It is well known that the dyes undergo two different pathways under different light illuminations [7,11]: the photocatalytic one by an apparent first-order kinetics under ultraviolet light and the photosensitization pathway by an apparent zero-order kinetics under visible light.…”

Section: The Photocatalytic Properties Of C/tio 2 Composites Under VImentioning

confidence: 99%

“…The photocatalytic pathway can be summarized as follows The photosensitization pathway of dyes under visible light has been characterized as dye+hv → dye* (5) dye* ads +TiO 2 → dye + ads +TiO 2 (e −1 ) (7) In our previous work [7], it has been proved that under visible light illumination, MB was photocatalytically degraded rather than simply photobleached over C/TiO 2 composites. In the present paper, MB and RB were both photocatalytically degraded over the three tested CCT samples, but their activity order was different from that under UV light.…”

Section: The Photocatalytic Properties Of C/tio 2 Composites Under VImentioning

confidence: 99%

“…Among various modified titanias, carbon-titania composites have been reported as a kind of promising photocatalyst. There are Translated photocatalytic properties of catalysts has been investigated, and it was proved that the catalyst treated at 500°C showed the highest activity of the photocatalytic degradation of MB [7]. In the present paper, two common dyes, methlene blue (MB) and rhodamine B (RB), have been chosen as model pollutants to study the effect of carbon content in the C/TiO 2 composites calcined at 500°C on their photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of carbon content on photocatalytic activity of C/TiO2 composite

Zhou

Zhu

et al. 2007

Front. Chem. China

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different methods reported to prepare C/TiO 2 responsive to visible light. Kisch and co-workers [2] prepared carboncontaining titania (CCT) by a modified sol-gel process using different alkoxide precursors, but the content of carbon is obviously difficult to be controlled. Carbon-doped titania can also be prepared by oxidation of a titanium metal sheet in a natural gas flame [3], but this method shows poor reproducibility and expedience. Oxidative annealing of TiC is another method reported to prepare carbon-modified titania, but the expensive material makes this method unpractical [4]. Recently, a simple process has been developed by our group for the preparation of uniform carbon-covered alumina (CCA) [5,6] and titania (CCT) [7] via pyrolysis of sucrose highly dispersed on the surface of alumina and titania. The carbon content can be easily controlled by tuning the sucrose content in the precursors. Additionally, this simple method has good reproducibility. It is proved that the as-prepared C/TiO 2 shows unique surface properties and ability to adsorb pollutant in the aqueous solution. For the model pollutant, methylene blue (MB), it is found that the adsorption capacity of C/TiO 2 catalysts is much higher than that of the mixture of corresponding titania and carbon with the same composition, or the summation of their respective adsorption capacity. Carbon covering the surface of titania can inhibit the phase transformation of TiO 2 during calcination, that is, titania in the as-prepared C/TiO 2 catalyst can maintain its anatase phase at high temperature and not be transformed to rutile phase. Photocatalytic tests show that under UV illumination, the kinetics of the elimination of MB in the suspension of CCT powders follows an apparent first-order rate as in pure titania suspension, but the rate constant is much higher than that of pure titania, even commercial Degussa P-25 TiO 2 . Under visible light illumination, CCT shows similar kinetic features for the photodegradation of the dyes to that under UV illumination, different from the apparent zero-order rate of pure titania. The detection of the products of MB degradation, and the absorption spectra of MB solution after the photocatalytic reaction proved that MB is decomposed over CCT samples under visible light illumination, whereas it is simply bleached over pure titania at the same condition. In the previous work, the effect of calcination temperature on the Abstract A series of carbon-covered titania (CCT) were prepared via pyrolysis of sucrose highly dispersed on titania surface in flowing N 2 . The samples were characterized by XRD, BET, DTA-TG, UV-Vis, and their photocatalytic properties were evaluated with two model pollutants, methylene blue (MB) and rhodamine B (RB), at room temperature. The effect of carbon content on photocatalytic activity of the C/TiO 2 composite was investigated. It was found that the effect of carbon content is different for different pollutants or different light sources. For three tested samples, under UV illumination CCT01 h...

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Carbon Materials in Photocatalysis

Faria

Wang

2008

Carbon Materials for Catalysis

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Uniform carbon-covered titania and its photocatalytic property

Cited by 76 publications

References 37 publications

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

Effect of carbon content on photocatalytic activity of C/TiO2 composite

Carbon Materials in Photocatalysis

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