Preparation method of highly dispersive spindle-shaped nano titanium dioxide sol

A nano-titanium dioxide, high-dispersion technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of unsafe factors, obvious toxicity, etc., and achieve the effect of abundant sources, low cost and simple synthesis process

Inactive Publication Date: 2009-11-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, few studies have shown that such as single-walled carbon nanotubes and polytetrafluoroethylene nanoparticles have obvious toxicity (J.L.Mauderly et al., J.Res.Rep.Health.Eff.Inst, 1994.68.1-75; A .Shvedova et al., J.Toxicol.Environ.Health A, 2003.66.1909-1926; G.Oberdorster et al., Res.Rep.Health.Eff.Inst, 2000.96.5-74)
Therefore, in consideration of safety, the introduction of non-metals, transition metals, dyes, organic substances, etc. may bring unsafe factors

Method used

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  • Preparation method of highly dispersive spindle-shaped nano titanium dioxide sol
  • Preparation method of highly dispersive spindle-shaped nano titanium dioxide sol
  • Preparation method of highly dispersive spindle-shaped nano titanium dioxide sol

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 3g of titanyl sulfate and dissolve it in 500ml of deionized water, stir at a speed of 800 rpm at room temperature, and add ammonia water with a mass concentration of 10% thereinto until the pH value is equal to 7.5. After 4 hours of continuous stirring, the resulting white precipitate was washed with deionized water and centrifuged 4 times at a speed of 8000. After mixing the centrifuged product with 600ml of deionized water, stir at a constant speed of 400 rpm, add hydrogen peroxide dropwise to adjust the pH value to 1, and continue stirring for 6 hours to obtain a highly dispersed fusiform nano-titanium dioxide sol. Such as figure 1 , TEM photos show clear highly dispersed spindle-shaped particles with a diameter of about 25nm and a length of about 50nm; as figure 2 , the XRD pattern of the xerogel corresponds to the JCPDS card numbered 73-1764, indicating that its crystal form is anatase; image 3 It is the Fourier transform infrared spectrogram of nano-tita...

Embodiment 2

[0029] Weigh 1 g of titanyl sulfate and dissolve it in 200 ml of deionized water, stir at a speed of 600 rpm at room temperature, and add ammonia water with a mass concentration of 30% dropwise until the pH value is equal to 11. After continuous stirring for 6 hours, the resulting white precipitate was washed with deionized water and centrifuged 4 times at a speed of 5000. Mix the centrifuged product with 400ml of deionized water, stir at a constant speed of 400 rpm, add hydrogen peroxide dropwise to adjust the pH to 5, and continue stirring for 5 hours to obtain a highly dispersed fusiform nano-titanium dioxide sol. The XRD pattern of the xerogel shows that its crystal form is anatase, and the TEM photo shows well-dispersed spindle-shaped particles with a diameter of about 20nm and a length of about 40nm.

Embodiment 3

[0031] Weigh 5g of titanyl sulfate and dissolve it in 500ml of deionized water, stir at a speed of 500 rpm at room temperature, and add ammonia water with a mass concentration of 50% dropwise until the pH value is equal to 8. After continuous stirring for 8 hours, the resulting white precipitate was washed with deionized water and centrifuged 4 times at a speed of 6000. After mixing the centrifuged product with 300ml of deionized water, stir at a constant speed of 400 rpm, adjust the pH value to 6, and continue stirring for 4 hours to obtain a highly dispersed fusiform nano-titanium dioxide sol. The XRD pattern of the xerogel shows that its crystal form is anatase, and the TEM photo shows clear and highly dispersed spindle-shaped particles with a diameter of 25nm and a length of 50nm.

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Abstract

The invention provides a preparation method of highly dispersive spindle-shaped nano titanium dioxide sol. The method comprises the following steps: adding ammonia with mass concentration being 10%-50% into aqueous solution containing titanyl sulfate, adjusting pH value to be 7.5-11; stirring and reacting for over 4 hours to obtain white precipitation, washing by deionized water and centrifugating for several times; mixing the white precipitation with the deionized water, adjusting pH value to be 1-7, stirring for over 2 hours to obtain highly dispersive spindle-shaped nano titanium dioxide sol. The invention improves traditional low-temperature synthesis technology, and the dispersibility of the prepared product is greatly improved; the spindle-shaped nano titanium dioxide has better biocompatibility and good biological security, and the invention has simple preparation method and low cost and is beneficial for industrialized production.

Description

technical field [0001] The invention relates to the technical field of preparation of titania sol, in particular to a preparation method of highly dispersed fusiform nano titania. Background technique [0002] Among all semiconductor photocatalysts, titanium dioxide is considered to have the most application potential due to its good biological and chemical inertness, strong oxidation resistance, strong resistance to photocorrosion and chemical corrosion, and low synthesis cost. Since Frank and Bark first discovered that titanium dioxide can be used to degrade cyanide in sewage in 1997, more and more scientists have been engaged in research on the application of titanium dioxide in environmental protection. Especially in water purification, air purification, antibacterial disinfection, cancer treatment, sewage treatment and so on. [0003] There are many ways to synthesize nano-titanium dioxide, such as sol-gel method, chemical precipitation method, hydrothermal synthesis, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 魏坤郭武生王迎军李像赵娜
Owner SOUTH CHINA UNIV OF TECH
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