Preparation and super-hydrophilic properties of TiO2/SnO2 composite thin films

Liu, Qingju; Wu, Xinghui; Wang, Baoling; Qiang, Liu

doi:10.1016/s0025-5408(02)00972-8

Cited by 88 publications

(26 citation statements)

References 6 publications

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“…The modifications of these catalysts include depositing noble metals on the surface of TiO 2 , doping of transition metal ions, composing of semiconductor and dye sensitization, etc. [3] .In this study, the nanocomposite photocatalysts SnO 2 /TiO 2 were prepared by novel SCFCT and a new crystal of (Ti, Sn)O 2 structure was observed which is different from the reported research [4] that most TiO 2 exists as rutile or anatase type crystal and SnO 2 is amorphous in the TiO 2 /SnO 2 complex. The photocatalytic activity for degradation of the acrylic acid was also studied.…”

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confidence: 62%

Synthesis of SnO2/TiO2 nanocomposite photocatalysts by supercritical fluid combination technology

et al. 2006

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SnO 2 /TiO 2 nanocomposite photocatalysts were prepared from TiCl 4 and SnCl 4 ·5H 2 O by supercritical fluid combination technique (SCFCT). This novel SCFCT is a combination of supercritical fluid drying method and sol-gel method. The XRD, TEM and FTIR results show that a new kind of active particle (Ti, Sn)O 2 has formed and there is no sign of SnO 2 crystals observed in the range of the doping concentration studied. The samples' photocatalytic activity was evaluated by the degradation of acrylic acid. The results indicate that the SnO 2 /TiO 2 nanocomposite photocatalysts prepared through SCFCT show significant improvement in catalytic activity as compared to pure TiO 2 or SnO 2 /TiO 2 catalysts prepared by traditional drying (TD). The effect of H 2 O 2 (0.167 v%) on the photodegradation was also investigated. After the addition of H 2 O 2 , the chemical oxygen demand (COD) of acrylic acid, which had been treated with (15.1 mol%) SnO 2 /TiO 2 nanocomposite photocatalysts for 3 h, was reduced from 400-500 to 20 mg/L. Keywords: SnO 2 /TiO 2 nanocomposite photocatalysts, supercritical fluid combination technique (SCFCT), acrylic acid, photodegradation.Acrylic acid, acrylic ester and their ramification have developed quickly in recent years. However, their production process produces a mass of waste water, which, when released into the aquatic ecosystem, becomes a source of dramatic disturbance of aquatic life. So how to deal with this problem has attracted much attention of scientists recently. At present, contaminations like acrylic acid are dealt with burning, bio-anaerobic method, which are complicated, hard-handling and high cost.Semiconductor photocatalysis appears as an emerging destructive technology, leading to the total mineralization of most of the organic pollutants [1] because of its nontoxicity, high activity and no-pollution. TiO 2 has become one of the most promising environment friendly catalysts [2] . However, photocatalytic activities of such catalysts are limited by the facts that its forbidden band is wide, and efficient photo-induced charges (electrons and holes) are only generated by near ultraviolet and are susceptible to recombination. The modifications of these catalysts include depositing noble metals on the surface of TiO 2 , doping of transition metal ions, composing of semiconductor and dye sensitization, etc. [3] .In this study, the nanocomposite photocatalysts SnO 2 /TiO 2 were prepared by novel SCFCT and a new crystal of (Ti, Sn)O 2 structure was observed which is different from the reported research [4] that most TiO 2 exists as rutile or anatase type crystal and SnO 2 is amorphous in the TiO 2 /SnO 2 complex. The photocatalytic activity for degradation of the acrylic acid was also studied. These novel catalysts are much better than those reported before, with regard to both the crystal structure and the catalytic activity. The success of the present study should shed light on the feasible application in the waste water treatment.

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confidence: 62%

Synthesis of SnO2/TiO2 nanocomposite photocatalysts by supercritical fluid combination technology

et al. 2006

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“…Similarly, low water contact angle (9.58) on the TiO 2 -coated substrates without UV light irradiation was also found in the previous research. 18 Therefore, the gas absorption efficiency and the memory effect were both tested by using the frosted glass plates coated with nanoTiO 2 particles.…”

Section: Resultsmentioning

confidence: 99%

A parallel plate wet denuder for acidic gas measurement

2008

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in Wiley InterScience (www.interscience.wiley.com).A parallel plate wet denuder (PPWD) was designed and tested for acidic gas absorption in this study. The PPWD is composed of two frosted glass plates coated with nano-TiO 2 particles. The gap of the plates is 4 mm, the active surface is 7.5 cm in width and 15 cm in height. The DI water is flowing downward along the surfaces to form a uniform water film to absorb the gas flowing upward along the gap. The gas absorption efficiency and memory effect were tested using test gases of HF (3.57-3.80 ppb), HCl (0.48-15.63 ppb), and HNO 3 (8.43-20.92 ppb) generated from permeation tubes at the flow rate of 5-10 L/min, scrubbing DI water flow rate of 1.0 mL/min/ plate, and pH 5 6.8 6 0.3. The experiment was also conducted for HF and HCl with scrubbing water pH value of 3.08 and 4.10 to examine the effect of pH on the absorption efficiency. The experimental data at different flow rates match with the theoretical values very well assuming perfect absorption condition at the water film when the scrubbing water pH 5 6.8 6 0.3. The absorption efficiency of the three gases at the sampling flow rate of 5 L/min was nearly 100% when the scrubbing water pH value was 6.8 6 0.3, but was found to decrease slightly when the pH value of scrubbing water was reduced from 6.8 to 3.08, which indicates slight modification of perfect absorption condition at the water film. The memory effect test showed that the rise time was 15 to 25 min and the fall time was 10 to 25 min for the three gases. Good uniformity of the water film was observed during the 9-day ambient air sampling for HF, HCl, and HNO 3 , which indicates the applicability of the present PPWD for ambient air sampling.

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“…This is because of the lack of hydroxyl group on the surface of TNT after annealing at higher temperatures (above 450°C). The surface hydroxyl can easily combine with water molecule, thus, formed hydrogen bond resulting in good wettability [206].…”

Section: Wettability Of Tntmentioning

confidence: 99%

A Review on TiO2 Nanotubes: Influence of Anodization Parameters, Formation Mechanism, Properties, Corrosion Behavior, and Biomedical Applications

et al. 2015

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In this article, influence of anodization parameters on the formation of tubes, tube dimensions, formation mechanism, properties of TiO 2 nanotubes (TNT), and their applications in biomedical field are reviewed. The fabrication of TNT of a different shape such as pore size, length, and wall thickness by varying anodization parameters including electrolytes, pH, voltage, electrolyte bath temperature, and current density is examined and discussed. The crystallographic nature of the nanotube obtained by various methods has also been discussed. Finally, the article concludes by examining the key properties including the corrosion aspect and various applications in biomedical field in depth.

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Preparation and super-hydrophilic properties of TiO2/SnO2 composite thin films

Cited by 88 publications

References 6 publications

Synthesis of SnO2/TiO2 nanocomposite photocatalysts by supercritical fluid combination technology

Synthesis of SnO2/TiO2 nanocomposite photocatalysts by supercritical fluid combination technology

A parallel plate wet denuder for acidic gas measurement

A Review on TiO2 Nanotubes: Influence of Anodization Parameters, Formation Mechanism, Properties, Corrosion Behavior, and Biomedical Applications

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