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Method for degrading methylene blue adsorbed in particles under solar illumination through titanium dioxide

A technology of titanium dioxide and methylene blue, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of very little research on degradation behavior, so as to ensure environmental protection and sustainable development, and ensure sustainable development. , the effect of fast degradation

Inactive Publication Date: 2017-09-15
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned degradation behavior of titanium dioxide to methylene blue all occurs in aqueous solution, and under the irradiation of sunlight, titanium dioxide is used to study the degradation performance of methylene blue adsorbed in the solid phase state, such as the methylene blue-containing adsorbent solid particles, that is, to the dried There are very few studies on the degradation behavior of methylene blue adsorbed on the surface of prepared solid particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Prepare an aqueous solution containing citric acid and calcium hydroxide, so that the concentrations of citric acid and calcium hydroxide are 0.052 moles per liter and 0.676 moles per liter respectively, and stir to obtain a uniform suspension, and then mix the citric acid and calcium hydroxide with a concentration of 0.408 moles per liter. Phosphoric acid aqueous solution is added drop by drop, stop dropping when the pH value of the suspension drops to 10, centrifuge after standing for 18 hours, and wash with ammonium chloride aqueous solution with a concentration of 0.755 moles per liter, wherein the amount of ammonium chloride is the same as that of hydroxide The molar ratio of the amount of calcium is 1.12:1, the hydroxyapatite colloid obtained by centrifugation is added to the solution containing methylene blue at a concentration of 0.5 mg / ml, and the hydroxyapatite is calculated based on the amount of calcium hydroxide added. After the theoretical production am...

Embodiment 2

[0018] (1) Prepare an aqueous solution containing citric acid and calcium hydroxide so that the concentrations of citric acid and calcium hydroxide are 0.104 moles per liter and 0.676 moles per liter respectively, and after stirring to obtain a uniform suspension, mix the citric acid and calcium hydroxide with a concentration of 0.408 moles per liter. Phosphoric acid aqueous solution is added drop by drop, stop dropping when the pH value of the suspension drops to 10, centrifuge after standing for 18 hours, and wash with ammonium chloride aqueous solution with a concentration of 0.755 moles per liter, wherein the amount of ammonium chloride is the same as that of hydroxide The molar ratio of the amount of calcium is 1.12:1, the hydroxyapatite colloid obtained by centrifugation is added to the solution containing methylene blue at a concentration of 0.5 mg / ml, and the hydroxyapatite is calculated based on the amount of calcium hydroxide added. After the theoretical production am...

Embodiment 3

[0022] (1) Prepare an aqueous solution containing citric acid and calcium hydroxide so that the concentrations of citric acid and calcium hydroxide are 0.156 moles per liter and 0.676 moles per liter respectively, and after stirring to obtain a uniform suspension, mix the citric acid and calcium hydroxide with a concentration of 0.408 moles per liter. Phosphoric acid aqueous solution is added drop by drop, stop dropping when the pH value of the suspension drops to 10, centrifuge after standing for 18 hours, and wash with ammonium chloride aqueous solution with a concentration of 0.755 moles per liter, wherein the amount of ammonium chloride is the same as that of hydroxide The molar ratio of the amount of calcium is 1.12:1, the hydroxyapatite colloid obtained by centrifugation is added to the solution containing methylene blue at a concentration of 0.5 mg / ml, and the hydroxyapatite is calculated based on the amount of calcium hydroxide added. After the theoretical production am...

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Abstract

The invention discloses a method for degrading methylene blue adsorbed in particles under solar illumination through titanium dioxide and belongs to the technical field of titania photocatalysis. The method is characterized by comprising the following steps that (1) a phosphoric acid solution is dropwise added into an aqueous solution containing citric acid and calcium hydroxide, hydroxyapatite is prepared, the hydroxyapatite is added into a solution containing the methylene blue, and a hydroxyapatite colloidal solution containing the methylene blue is prepared; (2) butyl titanate, nitric acid and polyethylene glycol are sequentially added into a mixed solution of ethyl alcohol and water, tartaric acid is added after water heating treatment, and a titanium dioxide solution is prepared; and (3) the titanium dioxide solution and hydroxyapatite colloidal solution containing the methylene blue are mixed and stirred, mixed particles are obtained through centrifugation and drying, and the methylene blue adsorbed in the particles can be degraded under solar illumination of 7-42 hours. According to the method, the process is simple, raw materials are low in cost, and industrial production is easily achieved. Degrading of the methylene blue can be achieved under solar illumination, and the degrading speed is high.

Description

technical field [0001] The invention discloses a method for degrading methylene blue adsorbed in particles by using titanium dioxide under sunlight, belonging to the technical field of titanium dioxide photocatalysis. Background technique [0002] As a dye, methylene blue is widely used in the fields of printing and dyeing. When methylene blue is contained in the wastewater generated by the printing and dyeing industry, it will have a bad impact on the water body and soil environment. The common treatment methods of methylene blue are adsorption method and photochemical oxidation degradation method. The adsorption method is mainly to adsorb methylene blue into adsorbents, such as activated carbon, bentonite, hydroxyapatite, mesoporous silica and ion exchange resins. Chinese invention patent CN201610105663.9 discloses a technical scheme for preparing modified hydroxyapatite by pulverizing hydroxyapatite particles and then adsorbing humic acid for adsorption of methylene blue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/17B01J21/06A62D101/28
Inventor 李成峰史如静王文浩杨飞李晓月葛筱璐
Owner SHANDONG UNIV OF TECH
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