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Preparation method for modified porous SiO2

A modified, strongly acidic cation technology, applied in the field of water treatment, can solve problems such as poor treatment effect of physical methods, secondary pollution of water sources and the environment, high cost of biological methods, etc., achieve strong adsorption, reduce production costs, and effect obvious effect

Inactive Publication Date: 2015-02-18
SUZHOU FUQINUO WATER TREATMENT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods such as physics, chemistry, biology and comprehensive methods to deal with the pollution of water resources, but most of the physical methods have the problems of poor treatment effect and unstable treatment rate; the cost of biological methods is too high to be popularized and used; the existing In the technology, chemical methods are mostly used to treat sewage, but the existing sewage treatment agents mostly use chemical reagents
[0005] For example, the application number is 201310569471.X, and the invention name is an invention patent of a sewage treatment agent. The technical solution recorded in it is: a sewage treatment agent, including: cationic polypropylene milling amine 1.2%-14.5%, ferric chloride 2%-25%, aluminum sulfate 1.5%-15%, aluminum phosphate 1.1%-17.5%, middle layer mineral clay 21%-55%, the iron salt and aluminum salt in the reagent components have secondary pollution to water sources and the environment question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of modified porous SiO2, comprising the following steps:

[0032] A. Prepare Sodium Silicate

[0033] Take the river sand, wash it and grind it into a fine powder, soak it with a NaOH solution with a concentration of 10-12mol / L, heat and stir at 135±15°C for 3 hours, and then let it stand at a constant temperature of 115±15°C for one day. The river sand fine powder is softened into a paste to obtain a sodium silicate solution;

[0034] B. Preparation of porous SiO 2

[0035] Dilute the sodium silicate solution obtained in step A by 1 times with water, perform ion exchange with a strong acidic cation exchange resin at a volume ratio of 0.5-1.5:1, and stir at room temperature for 1 hour to obtain a silicic acid aqueous solution with a pH of 3-5;

[0036] Take the supernatant of the silicic acid aqueous solution, add ammonia solution with a volume percentage of 10% -15%, until the viscosity of the supernatant of the silicic acid aqueous soluti...

Embodiment 2

[0041] Preferably, the strongly acidic cation exchange resin is a strongly acidic styrenic cation exchange resin.

[0042] New resins often contain solvents, substances that have not participated in the polymerization reaction, and a small amount of low polymers. They may also absorb metal ions such as iron, copper, and aluminum. When the resin is in contact with acid or other solutions, the above-mentioned soluble impurities will be transferred into the solution. In the early stage of use, the water quality of the effluent is polluted. Therefore, the new resin should be pretreated in the ion exchange equipment before use.

[0043] In the present invention, the method for pretreatment of the strongly acidic cation exchange resin: place the strong acidic cation exchange resin in 2 times the volume of saturated salt water and soak for 24 hours, drain the salt water, then rinse the strong acid cation exchange resin with clear water to The clear water does not turn yellow; then p...

Embodiment 3

[0046] After repeated adsorption of calcium and magnesium ions, the porous SiO 2 There are relatively large amounts of water-insoluble calcium and magnesium palmitate salts remaining in the water, which are blocked in the silica layer; after being used to a certain extent, EDTA is used to react with it to generate calcium and magnesium salts of palmitic acid and EDTA. Calcium and magnesium salts are easily soluble in water, which can achieve the effect of silica gel regeneration. And minimize the loss of palmitic acid.

[0047] In the present invention, the modified porous SiO 2 The regeneration method used for sewage purification is: the used modified porous SiO 2 Place in 2wt% EDTA aqueous solution and stir for 20±15min, soak and rinse with water, filter, and dry to obtain regenerated porous SiO 2 .

[0048] The modified porous SiO of the present invention 2 It has a porous structure and strong adsorption, which can be used to filter suspended solids in water and absorb...

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Abstract

The invention relates to a preparation method for modified porous SiO2 used for sewage treatment. The preparation method comprises the following steps: preparing sodium silicate; preparing porous SiO2; modifying the porous SiO2; performing other steps. The invention further discloses a method for pretreating a strong acid cation exchange resin, a regeneration method of the modified porous SiO2 for sewage purification and a recycling method of the strong acid cation exchange resin. The cheap river sand is used to prepare the porous SiO2; the source of the material is wide; with the use of the local material, the geographic restrictions of preparing sodium silicate from quartz sand are reduced; the transportation cost is lowered to reduce the production cost; relatively mild reaction conditions, instead of high temperature and high pressure, are chosen in the preparation process, so that the industrial production is beneficial; the porous SiO2 is prepared. The modified porous SiO2 has a continuous network structure and is relatively uniform in both pore size distribution and pore size, parts of the pore sizes reach the nanoscale, and the modified porous SiO2 has a strong adsorption capability.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified porous SiO 2 method of preparation. Background technique [0002] Due to population growth and economic development, a series of problems affecting the quality of resources caused by excessive exploitation and irrational development and utilization of resources have directly threatened the survival of us and future generations. Our country is also facing these problems. Our country is a country with scarce water resources. How to alleviate the shortage of water resources and pollution has become an urgent problem. [0003] With the development of industrialization, there are more and more production sewage. Random discharge will have a bad impact on the environment. In order to improve the environment, sewage treatment technology has emerged. Sewage treatment is to make sewage reach a certain water body for drainage or re-use The use of water quality requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28
CPCB01J20/103B01J20/3085B01J2220/4806C02F1/281
Inventor 吴彦
Owner SUZHOU FUQINUO WATER TREATMENT EQUIP
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