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Method for preparing Bi-Mn doping-modified TiO2/diatomite composite material by sol-gel method with ultrasonic wave assistance

A sol-gel method and composite material technology, applied in the field of sewage treatment, can solve the problems of low stability and easy deactivation of pure nano-titanium dioxide

Inactive Publication Date: 2019-04-12
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of pure nano-TiO2 is not high, and it is easy to inactivate. Therefore, a series of methods are used to process nano-TiO2. 2 Modification, increasing its photocatalytic degradation ability is the direction of scientists' efforts

Method used

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  • Method for preparing Bi-Mn doping-modified TiO2/diatomite composite material by sol-gel method with ultrasonic wave assistance
  • Method for preparing Bi-Mn doping-modified TiO2/diatomite composite material by sol-gel method with ultrasonic wave assistance
  • Method for preparing Bi-Mn doping-modified TiO2/diatomite composite material by sol-gel method with ultrasonic wave assistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Purification of diatomaceous earth, the steps are as follows:

[0041] 1), pickling

[0042] Dilute concentrated sulfuric acid with deionized water into a sulfuric acid solution with a volume concentration of 0.6, constant volume with a volumetric flask, weigh 12g of diatomite raw soil with an electronic balance, and mix it with the configured sulfuric acid solution separately. Place on a magnetic stirrer and stir for 12 hours. Suction filter and wash the solution with deionized water, rinse off the acid solution and metal ion salt solution on the surface of diatomaceous earth, and finally put the filtered solid into a drying oven at 80°C for aging and drying for 12 hours.

[0043] 2), Roasting

[0044] Weigh 12 g of dry diatomite with an electronic balance, place it in a muffle furnace and calcinate at a temperature of 550° C., and set the calcining time to 3 hours to obtain purified diatomite.

[0045] Table 1 purification obtains the composition content of diatomi...

Embodiment 2

[0049] Preparation of TiO by Ultrasonic-Assisted Sol-Gel Method 2 / diatomite composite material method, the steps are as follows:

[0050] (1) Preparation of precursor solution: Measure 10 mL of absolute ethanol (CH 3 CH 2 OH) as a dispersant in a beaker with magnetic stirring, then slowly pour 2.5mL butyl titanate (C 16 h 36 o 4 Ti) was used as the titanium source, and finally 1 mL of glacial acetic acid (CH 3 COOH) as an inhibitor, slowly poured into a beaker; Weighed 5g of purified high-grade diatomite with an electronic balance, slowly poured into a beaker, and stirred for 1h;

[0051] (2) Prepare the aqueous solution: use a pipette to measure 0.4mL deionized water into a beaker (dry before use), then pour 5ml of absolute ethanol (CH 3 CH 2 OH), and finally add 1ml of dilute hydrochloric acid to adjust the pH of the solution so that pH=3;

[0052] (3) Add the solution prepared in the second step to the precursor solution dropwise at a rate of 10 drops / min, and keep...

Embodiment 3

[0056] Preparation of Mn-doped TiO by Ultrasonic-Assisted Sol-Gel Method 2 / diatomite composite material method, the steps are as follows:

[0057] (1) Preparation of precursor solution: Measure 10 mL of absolute ethanol (CH 3 CH 2 OH) as a dispersant in a beaker with magnetic stirring, then slowly pour 2.5mL butyl titanate (C 16 h 36 o 4 Ti) was used as the titanium source, and finally 1 mL of glacial acetic acid (CH 3 COOH) as an inhibitor, slowly poured into a beaker; Weighed 5g of purified high-grade diatomite with an electronic balance, slowly poured into a beaker, and stirred for 1h;

[0058] (2) Prepare ionic solution: use a pipette to measure 0.4mL deionized water into a beaker (dried before use), then pour 5mL of absolute ethanol (CH 3 CH 2 OH), and finally add 1mL of dilute hydrochloric acid to adjust the pH of the solution to pH=3; weigh a certain mass of manganese chloride with a balance (control the molar ratio of manganese chloride to titanium dioxide to b...

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Abstract

The invention discloses a method for preparing a Bi-Mn doping-modified TiO2 / diatomite composite material by a sol-gel method with ultrasonic wave assistance and relates to the technical field of sewage treatment. The method comprises the steps: taking anhydrous ethanol as a dispersant, taking butyl titanate as a titanium source, taking glacial acetic acid as an inhibitor, and adding purified high-grade diatomite, so as to obtain a precursor solution; and dropwise adding a pH-adjusted aqueous solution into the precursor solution, and then, carrying out a sol gel reaction, thereby obtaining theTiO2 / diatomite composite material. Due to doping of ions of metals, i.e., Bi and Mn, a crystal phase of nano titanium dioxide is not changed, however, the crystallinity is better, and the particle size is reduced. The photocatalysis capability is successfully improved due to the doping of the metal ions. The photocatalysis performance of the composite material codoped with two kinds of ions is better than that doped with single ions, and the modification effect of manganese ions is better than that of bismuth ions.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an ultrasonic-assisted sol-gel method for preparing Bi-Mn doped modified TiO 2 / diatomaceous earth composite method. Background technique [0002] At present, the printing and dyeing wastewater is not well recycled and treated in industrial production, so that the printing and dyeing wastewater directly enters the water body of human daily life. The dye wastewater is difficult to be naturally degraded by microorganisms living in the water body, because the printing and dyeing wastewater contains a large amount of toxic organic substances. (The refractory groups include azo, benzene ring, etc.), toxic heavy metals, etc., generally pH>7. In addition to being difficult to degrade, printing and dyeing wastewater is also highly toxic, seriously polluting the fresh water resources that people need in their daily lives. Toxins enter the groundwater, which can affect human h...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/03C02F1/30C02F101/30
CPCC02F1/30B01J23/34B01J37/036C02F2305/10C02F2101/308B01J35/39
Inventor 阳杰李少波王玉吴义平王嘉琪刘程夏棚棚廖文浩王敬泽李东陆井李红晨
Owner HEFEI UNIV
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