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Preparation method of nano titanium dioxide adsorbent and application thereof

A nano-titanium dioxide and adsorbent technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low removal efficiency, nano-TiO2 agglomeration, crystal incompleteness, etc., and achieve the effect of improving the removal rate

Inactive Publication Date: 2013-05-01
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common methods for treating fluorine and arsenic in aqueous solution include precipitation, flocculation, ion exchange and membrane technology, etc., but the existing problems are complex methods, high cost and low removal efficiency
The raw material cost of the sol-gel method is high, and the volume of the gel shrinks greatly during drying and calcination, which easily causes the agglomeration of nano-TiO2
Although the process of the precipitation method is relatively simple, it is easy to cause the local concentration of the precipitant to be too high, which promotes the rapid formation of a large number of fine precipitates. Due to the rapid formation of particles, the crystals are often incomplete, the surface area is large, it is difficult to grow and precipitate, and the particles are easy to agglomerate

Method used

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  • Preparation method of nano titanium dioxide adsorbent and application thereof
  • Preparation method of nano titanium dioxide adsorbent and application thereof
  • Preparation method of nano titanium dioxide adsorbent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: A kind of nano titanium dioxide adsorbent

[0024] (1) The preparation method is as follows:

[0025] Prepare the titanium sulfate solution according to the molar ratio of titanium sulfate and water as 1:9, heat in a water bath at 80°C for 3h, filter after cooling, and rinse with deionized water continuously, dry and calcinate the precipitate at 50°C for 6h, Grind into powder to obtain nano-TiO 2 , the comparison of X-ray diffraction standard patterns shows that it is anatase phase; its scanning electron microscope photos are as follows figure 2 As shown, its average diameter is less than 20 nm.

[0026] (2) Adsorption test

[0027] Add 100mL of fluorine and arsenic solutions to a 250mL Erlenmeyer flask respectively, the initial concentration of fluorine is 10mg / L, the initial concentration of arsenic is 100mg / L, the amount of adsorbent is 0.1g / L, and the initial pH value of the solution is adjusted to 6.0 with HCl and NaOH , Shake at 25°C and 125r / mi...

Embodiment 2

[0028] Embodiment 2: A kind of nano titanium dioxide adsorbent

[0029] (1) The preparation method is as follows:

[0030] Prepare the titanium sulfate solution according to the molar ratio of titanium sulfate to water as 1:4, heat in a water bath at 80°C for 2 hours, filter after cooling, rinse the precipitate with deionized water continuously, dry and calcinate at 100°C for 2 hours, and grind Nano-TiO obtained in powder form 2 , the comparison of the X-ray diffraction standard spectrum shows that it is anatase phase; its scanning electron micrograph shows that its average diameter is less than 20nm.

[0031] (2) Adsorption test

[0032] Add 100mL of fluorine and arsenic solutions to a 250mL Erlenmeyer flask respectively, the initial concentration of fluorine is 10mg / L, the initial concentration of arsenic is 100mg / L, the amount of adsorbent is 0.1g / L, and the initial pH value of the solution is adjusted to 6.0 with HCl and NaOH , Shake at 25°C and 125r / min for 24h. Calcu...

Embodiment 3

[0033]Embodiment 3: A kind of nano titanium dioxide adsorbent

[0034] (1) The preparation method is as follows:

[0035] Titanium sulfate solution was prepared according to the molar ratio of titanium sulfate to water as 1:1.5, heated in a water bath at 80°C for 4 hours, filtered after cooling, and the precipitate was continuously washed with deionized water, dried and calcined at 100°C for 4 hours, and ground Nano-TiO obtained in powder form 2 , the comparison of the X-ray diffraction standard spectrum shows that it is anatase phase; its scanning electron micrograph shows that its average diameter is less than 20nm.

[0036] (2) Adsorption test

[0037] Add 100mL of fluorine and arsenic solutions into a 250mL Erlenmeyer flask respectively, the initial concentration of fluorine is 10mg / L, the initial concentration of arsenic is 100mg / L, the amount of adsorbent is 0.1g / L, and the initial pH value of the solution is adjusted to 6.0 with HCl and NaOH , Shake at 25°C and 125r / ...

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Abstract

The invention relates to a preparation method of a nano titanium dioxide adsorbent and application thereof, and belongs to a water treatment adsorption technology in the field of environment protection. The preparation method of the nano titanium dioxide adsorbent mainly comprises the following steps: preparing nano titanium dioxide with titanium sulfate by a low-temperature hydrolytic heating method, wherein the obtained titanium dioxide belongs to an anatase phase and has an average diameter of smaller than 20 nm; and adding Fe<3+>, Fe<2+>, Al<3+>, Ce<3+>, Mn<2+> and other metal ion modifiers in a reaction solution to improve adsorption rates of the nano titanium dioxide to harmful fluorine anions and arsenic anions in water. The prepared nano titanium dioxide adsorbent can effectively adsorb and remove harmful inorganic fluorine anions and harmful arsenic anions in industrial smelting wastewater and general water.

Description

technical field [0001] The invention belongs to the technical field of water treatment adsorption, and in particular relates to a preparation method of a nano-titanium dioxide adsorbent capable of effectively removing harmful inorganic anions (fluoride ions and arsenic ions) in industrial smelting wastewater and general water bodies. Background technique [0002] Fluorine is a double-edged sword for human health, and fluorine content below or exceeding the allowable range will cause great harm to the human body. When the intake of fluoride is insufficient, dental caries is easy to suffer from, but if the water with high fluoride content is drunk for a long time, fluorosis is very easy to occur, and the bone fluorosis caused by it is one of the most widely distributed endemic diseases in the world one. WHO stipulates that the fluoride ion content in drinking water should be less than 1mg / L. Arsenic has carcinogenic, mutagenic and teratogenic effects on the human body and ot...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/30C01G23/053C02F1/28C02F1/58
CPCY02W10/37
Inventor 邓慧廖学品石碧
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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