Preparation and photocatalytic activity of silver and TiO2 nanoparticles/montmorillonite composites

Liu, Jianjun; Li, Xinping; Zuo, Shengli; Yu, Yingchun

doi:10.1016/j.clay.2007.01.008

Cited by 100 publications

(43 citation statements)

References 30 publications

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“…3b) with that of ATT (Fig. 3a), the characteristic reflections for SnO 2 were also observed, indicating that SnO 2 particles had been loaded on to the surface of ATT [15,35]. The same reflections were detected in the XRD patterns of ATT-SnO 2 -TiO 2 with different proportions [r = 0.25 and r = 0.5] (Fig.…”

Section: Adsorption/photocatalytic Activity Measurementssupporting

confidence: 62%

“…It has been reported that the support-based photocatalysts, which can adsorb and concentrate the reactants but still allow the latter to diffuse from the adsorption site to the photocatalyst surface, were quite efficient in improving the degradation rate of the pollutants [15][16][17]. In addition, supported catalysis has been awarded the status of "green" chemistry because it allows easy separation of the products and permits the recycling and reuse of the catalysts, giving both operational and economical advantages [18].…”

Section: Introductionmentioning

confidence: 99%

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Photo degradation of methyl orange by attapulgite–SnO2–TiO2 nanocomposites

Zhang

et al. 2009

Journal of Hazardous Materials

112

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Section: Adsorption/photocatalytic Activity Measurementssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Photo degradation of methyl orange by attapulgite–SnO2–TiO2 nanocomposites

Zhang

et al. 2009

Journal of Hazardous Materials

112

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“…Manual coating using a paint brush was applied mainly for Degussa P25, clay TiO 2 , and sol-gel TiO 2 . A modified method of Liu et al (2007) was used to prepare clay TiO 2 catalyst. About 2.4 mL of titanium tetraisopropoxide was mixed with 20 mL of ethanol with constant stirring for about 20 min, and water was added dropwise to the sol-gel solution.…”

Section: Catalysts Preparationmentioning

confidence: 99%

Application of ultraviolet light-emitting diode photocatalysis to remove volatile organic compounds from indoor air

Sharmin

Ray

2012

Journal of the Air & Waste Management Association

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Photocatalytic oxidation (PCO) is a promising technology for indoor air purification due to low operating cost, potentially long service life, and low maintenance. Ultraviolet light-emitting diode (UVLED) is a new concept in the field of PCO, which has several advantages over conventional UV light sources. Limited research has been conducted using UVLED PCO for air treatment. This study demonstrated the potential application of UVLED for the removal of volatile organic compounds (VOCs; toluene and xylene) from indoor air under different operating conditions including flow rate (25-117 cubic feet per minute [cfm]), types of catalysts (Degussa P25, sol-gel TiO 2 , nitrogen-doped TiO 2 , clay TiO 2 , and Bi 2 O 3 ), LED intensity, and humidity in a continuous reactor. About 7-32% VOC removal occurred depending on the experimental conditions. The results show that UVLED can activate different types of photocatalysts effectively.Implications: This study demonstrates the effectiveness of UVLED in photocatalytic oxidation applied for indoor air cleaning. Several TiO 2 catalysts (Degussa P25, sol-gel TiO 2 , nitrogen-doped TiO 2 , clay TiO 2 , and Bi 2 O 3 ) were used in the reactor to characterize the removal performance of indoor air pollutants, for example, VOCs. This is one of the very few studies that have, to date, examined toluene and xylene removal from indoor air using these catalysts with UVLED in a continuous reactor. The intent is to develop an energy-efficient continuous reaction system to remove VOCs from indoor air. The performance of the system was characterized with respect to air flow rate, humidity, types of catalysts, and light intensity.

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“…Pillared clays, organoclays and pillared organoclays are obtained by the intercalation of inorganic or organic cations, or a combination of both into clays to obtain materials for specific applications. They are usually used for water pollutants removal by adsorption and/or photodegradation of them [1][2][3][4][5][6][7]. The study of these materials is important to improve their use in environmental chemistry.…”

Section: Introductionmentioning

confidence: 99%

Surface and textural characterization of TiO2 pillared organoclays

Vercelone¹,

Sham²,

Torres³

2015

Matéria (Rio J.)

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TiO 2 organoclays are potential adsorbents for aqueous pollutants and subsequently they could favour the photocatalysis of them. For this reason, the study of their surface and textural characteristics is important for the improvement of those processes. In this work TiO 2 pillared organoclays were studied. The surfactant (hexadecyltrimethilammonium bromide) was introduced post-pillaring or during the pillaring process. The effect of the use of different acids of hydrolysis and different surfactants ratios was investigated. The clays were characterized by thermogravimetric analysis, infrared spectroscopy and nitrogen sorptometry. It was found that the highest adsorption capacity post-pillaring of the surfactant is near to 0.5 times the CEC of the original pillared clay, independently of the amount of surfactant offered. An increment in the amount of the surfactant introduced only increased the ratio adsorbed as ionic pair. In these samples the CEC measured after the adsorption was between 0.26 and 0.47 times the original CEC. It was observed a decrease in the total pore volume and the BET surface for every sample. The surface hydrophobicity of the samples with post-pillaring adsorption was higher than in those with co-adsorption. In conclusion, it was demonstrated that the incorporation of surfactant modifies the surface and textural properties of the material in different extent in accordance with the incorporation stage and the amount of surfactant used.

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Preparation and photocatalytic activity of silver and TiO2 nanoparticles/montmorillonite composites

Cited by 100 publications

References 30 publications

Photo degradation of methyl orange by attapulgite–SnO2–TiO2 nanocomposites

Photo degradation of methyl orange by attapulgite–SnO2–TiO2 nanocomposites

Application of ultraviolet light-emitting diode photocatalysis to remove volatile organic compounds from indoor air

Surface and textural characterization of TiO2 pillared organoclays

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