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A micro-nanoporous polymeric aluminum coagulation aid and its preparation method and application

A technology of porous polymerization and coagulant aid, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of poor fluoride ion adsorption capacity, separation, and low adsorption rate. to overcome the low adsorption capacity, the increase of surface active groups, and the difficulty of regeneration

Active Publication Date: 2022-02-08
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the shortcomings and deficiencies of the existing technology, the purpose of the present invention is to provide a preparation method of micro-nanoporous polymeric aluminum coagulation aid, which can greatly increase the number and activity of surface groups of aluminum-based materials, and solve the problem of traditional aluminum-based materials. Poor adsorption capacity and low adsorption rate for fluoride ions, difficult to separate from water, and the preparation method is simple and easy to implement

Method used

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  • A micro-nanoporous polymeric aluminum coagulation aid and its preparation method and application
  • A micro-nanoporous polymeric aluminum coagulation aid and its preparation method and application

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Embodiment 1

[0032] A preparation method of a micro-nanoporous polymeric aluminum coagulant, comprising the following steps:

[0033] Step 1. Disperse aluminum isopropoxide and calcium sulfate in 3:1 molar ratio (20.42 g of aluminum isopropoxide and 5.73 g of calcium sulfate) in 200 mL of pure water, stir and mix evenly to obtain a mixed solution;

[0034] Step 2, adding sodium hydroxide solution to the mixed solution to adjust the pH to 8.0;

[0035] Step 3, aging the obtained alkaline solution in an oil bath at 80°C for 2 hours to obtain a precursor;

[0036] Step 4. Put the cured precursor into the autoclave and heat it at 180ºC for 1 day;

[0037] Step 5. The cooled reaction product is separated and extracted by centrifugation, dried at 60°C, and then ground into powder to 200 mesh to obtain the micro-nanoporous polymeric aluminum coagulation aid.

[0038] The morphology of the micro-nanoporous polyaluminum-calcium coagulant synthesized in Example 1 was characterized by a scanning el...

Embodiment 2

[0040] A preparation method of a micro-nanoporous polymeric aluminum coagulant, comprising the following steps:

[0041] Step 1. Disperse aluminum isopropoxide and iron sulfate in 3:1 molar ratio (20.42 g of aluminum isopropoxide and 13.33 g of iron sulfate) in 200 mL of pure water, stir and mix evenly to obtain a mixed solution;

[0042] Step 2, adding sodium hydroxide solution to the mixed solution to adjust the pH to 8.0;

[0043] Step 3, aging the obtained alkaline solution in an oil bath at 80°C for 2 hours to obtain a precursor;

[0044]Step 4. Put the cured precursor into the autoclave and heat it at 180ºC for 1 day;

[0045] Step 5. The cooled reaction product is separated and extracted by centrifugation, dried at 60°C and ground into powder to 200 meshes to obtain the desired micro-nanoporous polymeric aluminum coagulation aid.

[0046] For the micro-nanoporous polymeric aluminum-iron coagulant synthesized in Example 2, the test results for actual fluorine-containin...

Embodiment 3

[0048] A preparation method of a micro-nanoporous polymeric aluminum coagulant, comprising the following steps:

[0049] Step 1. Disperse aluminum isopropoxide and magnesium sulfate in 3:1 molar ratio (20.42 g of aluminum isopropoxide and 4.00 g of magnesium sulfate) in 200 mL of pure water, stir and mix evenly to obtain a mixed solution;

[0050] Step 2, adding sodium hydroxide solution to the mixed solution to adjust the pH to 8.0;

[0051] Step 3, aging the obtained alkaline solution in an oil bath at 80°C for 2 hours to obtain a precursor;

[0052] Step 4. Put the cured precursor into the autoclave and heat it at 180ºC for 1 day;

[0053] Step 5. The cooled reaction product is separated and extracted by centrifugation, dried at 60°C and ground into powder to 200 meshes to obtain the desired micro-nanoporous polymeric aluminum coagulation aid.

[0054] For the micro-nanoporous polymeric aluminum-magnesium coagulant synthesized in Example 3, the test results for actual flu...

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Abstract

The invention discloses a micro-nanoporous polymeric aluminum coagulation aid and its preparation method and application. The preparation of the material takes aluminum isopropoxide as a base template, disperses aluminum isopropoxide and sulfate in pure water, and adjusts pH to weakly alkaline, the corresponding precursor is obtained after aging under hydrothermal conditions, and the precursor is polymerized under high pressure and high temperature atmosphere to obtain the desired micro-nanoporous polymeric aluminum coagulation aid. The synthesis method and process in the present invention are simple and easy to operate. The surface of the micro-nanoporous polymeric aluminum coagulation aid synthesized by this method is rich in hydroxyl groups, sulfate radical active groups and metal ion active sites, and exists in the form of colloids in water bodies. It can simultaneously realize the two effects of rapid adsorption of fluoride ions and rapid coagulation aid; after adding conventional flocculants, the colloidal state will immediately transform into a floc state, and finally settle down to achieve rapid separation of water and mud without causing secondary pollution to the water body. The final micro-nanoporous polymeric aluminum coagulation aid can be recycled by soaking and drying.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and in particular relates to a micro-nano porous polymeric aluminum coagulation aid and its preparation method and application. Background technique [0002] Fluorine is one of the trace chemical elements ubiquitous in nature. It is an indispensable substance for maintaining the growth of animal and plant bones and teeth. However, excessive intake of fluoride ions will lead to a series of diseases, such as dental fluorosis, skeletal fluorosis, and kidney, liver and brain lesions, causing abnormal immune function, and even life-threatening in severe cases. my country's "Drinking Water Sanitation Standard" (GB5749-2006) clearly stipulates that the fluorine content in drinking water should be less than 1.0 mg / L; the drinking water standard formulated by the World Health Organization (WHO) stipulates that the fluorine content should not exceed 1.5 mg / L. The causes of fluorine pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/28C02F101/14
CPCC02F1/5236C02F1/281C02F2101/14
Inventor 何军勇孔令涛张开胜吴子健谢超刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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