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Titanium salt coagulant and direct oxidation preparation method thereof

A coagulant and titanium salt technology, applied in the field of environment and chemistry, can solve the problems of complex preparation process, unstable structure and long preparation period, and achieve the effect of promoting product complexation, improving stability and excellent coagulation effect.

Pending Publication Date: 2022-08-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow alkali drip coagulation method not only has a complicated preparation process, but also the way of pre-adding alkali polymerization also leads to its unstable structure, which is easily hydrolyzed and inactivated in the air; although the sol-gel method introduces a chelating agent to a large extent It has improved the problem of hydrolysis in the air, but due to its slow polymerization reaction, high energy consumption and long production cycle, it also restricts its development to industrial applications.
[0005] Therefore, based on the advantages and disadvantages of the two preparation methods, the present invention provides a method for preparing a titanium salt coagulant using methanol as a solvent, acetylacetone as a chelating agent, and hydrogen peroxide as an oxidation catalyst to improve the long preparation cycle and easy hydrolysis. Insufficiency of the existing preparation technology

Method used

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  • Titanium salt coagulant and direct oxidation preparation method thereof
  • Titanium salt coagulant and direct oxidation preparation method thereof
  • Titanium salt coagulant and direct oxidation preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Under the stirring condition of 800rpm at 25°C, 4.1ml of titanium tetrachloride was added dropwise to 20ml of anhydrous methanol and different proportions of acetylacetone mixed solutions at a rate of 1ml / min, and mixed The molar mass ratios of titanium ion and acetylacetone prepared are (1:1 / 16), (1:1 / 8), (1:3 / 16), (1:1 / 4) and (1:5 / 16) ) mixed solution;

[0031] (2) Under the stirring condition of 800 rpm in the above step 1), H 2 O 2 Add it into the mixed solution of step 1), stir it fully, and dissolve it to prepare titanium ions and H 2 O 2 The molar ratio of (1:2), (1:4), (1:6) and (1:8) mixed solution, stirring continuously;

[0032] (3) Dry and grind into powder.

Embodiment 2

[0034] The polymeric titanium coagulant (PTC-AcAc) prepared in the above Example 1 was applied to the processing of kaolin-HA simulated water samples, and the processing steps were as follows:

[0035] Water sample preparation method:

[0036] Configuration of the kaolin stock solution: Weigh 2.0g of kaolin and dissolve it in 800ml of pure water, continue stirring until it is completely dissolved, transfer it into a 1L beaker and dilute to 1L with pure water, let it stand for 0.5h, take the supernatant for later use, and prepare. Get the kaolin stock solution.

[0037] Configuration of humic acid (Humic Acid, HA) stock solution: Weigh 1.0g of humic acid and add it to 800ml of sodium hydroxide solution with a concentration of 0.05mol / L, continue stirring for 2h until the humic acid is completely dissolved, and then add 0.05mol / L The volume of 1 L of sodium hydroxide solution was adjusted to 1 L to obtain a HA stock solution with a concentration of 1.0 g / L, which was placed in ...

Embodiment 3

[0055] The titanium salt coagulant prepared in Example 1 above was applied to the treatment of chromium-containing wastewater prepared by potassium dichromate.

[0056] The preparation method of the simulated water sample of chromium-containing wastewater: Weigh 141.4 mg of potassium dichromate and dissolve it in 1 L of water, stir 1 L to completely dissolve, and obtain a potassium dichromate solution with a concentration of 50 mg / L (soluble Cr), the pH of the solution is 6.25.

[0057] Preparation method of chromium-containing wastewater and kaolin simulated water sample: Weigh 141.4 mg of potassium dichromate and dissolve it in 800 L of water, stir for 1 hour to completely dissolve, and obtain a potassium dichromate solution with a concentration of 50 mg / L (soluble Cr ions). Weigh 1 g of kaolin solution in 1 L of water and stir until completely dissolved. A certain amount of kaolin solution was added to the chromium simulated wastewater and the volume was adjusted to 1 L to...

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Abstract

The invention provides a titanium salt coagulant and a direct oxidation preparation method thereof, and relates to the technical field of environment and chemistry. The method comprises the following steps: firstly, dropwise adding titanium tetrachloride into a mixed solution of alcohol and acetylacetone, stirring until the titanium tetrachloride is completely dissolved to obtain a mixed solution of titanium tetrachloride, acetylacetone and methanol, dropwise adding a certain amount of H2O2 into the mixed solution of titanium tetrachloride, acetylacetone and methanol under a stirring condition, stirring until the solution is completely mixed, and carrying out solid-liquid separation to obtain a titanium tetrachloride / acetylacetone mixed solution; placing the mixed solution added with H2O2 in air, drying to constant weight, and grinding to obtain titanium salt coagulant powder. The coagulant prepared by adopting the method has the advantages of high stability, strong adsorption bridging capability on colloidal substances, excellent coagulation effect, small effluent pH change, easiness in treatment of coagulation byproducts, few residual metal ions harmful to human bodies in water and the like, and has a good water treatment effect when being applied to water supply and wastewater treatment.

Description

technical field [0001] The invention relates to the technical fields of environment and chemistry, in particular to a preparation method and application of a titanium salt coagulant. Background technique [0002] Coagulation, as a mature water treatment technology, plays an important role in the water treatment process. Inorganic salt coagulants such as aluminum and iron occupy a large market share due to their efficient coagulation performance and low preparation cost. However, with the gradual deepening of research on iron-aluminum salt coagulants, the disadvantages of the two have gradually emerged. For example, the ion residual concentration of iron salt coagulants is too high, which is easy to corrode metal pipes and cause a large amount of membrane pollution; aluminum salts The floc formation of the coagulant is slow, and the aluminum ions remaining in the aqueous solution are harmful to human health. Therefore, the development of a new type of coagulant is imminent....

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G23/02
CPCC02F1/5236C01G23/02Y02W10/37
Inventor 郭俊许霞杨若莹高宇张玲薛银刚
Owner CHANGZHOU UNIV