Preparation method of carrying type laminated hydroxyl magnesium oxide composite material

A technology of magnesium oxyhydroxide and composite materials, which is applied in the field of preparation of phosphate materials for purifying biochemical tail water, can solve problems such as poor kinetic performance, small size characteristics of nanoparticles, easy agglomeration or growth, etc., so as to solve the problem of poor kinetic performance. , the effect of large adsorption capacity and large specific surface area

Inactive Publication Date: 2014-07-02
YANSHAN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the published patents and literatures, the development of this type of composite material is mainly divided into two categories: 1. Microporous materials such as activated carbon and molecular sieve are used as carriers to prepare supported nanocomposites. The micropores of this type of material itself The structure shows the confinement effect of the orifice plate, which is beneficial to obtain high dispersion, the formation of small particle size, and improve the adsorption capacity, but the pore blockage is serious during the loading process, resulting in slow adsorption and mass transfer rate, and low utilization efficiency of loaded nanoparticles
2. Macroporous polymers, clay, biochar and other macroporous or mesoporous materials are used as carriers. The large pore characteristics of such materials can alleviate the bottleneck of poor kinetic performance and slow adsorption and mass transfer rate to a certain extent. Due to the high surface energy of the imported nanoparticles, it is easy to agglomerate or grow, which leads to the loss of the small size characteristics of the high surface area of ​​the nanoparticles, which hinders the further development of this type of material to a certain extent.

Method used

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  • Preparation method of carrying type laminated hydroxyl magnesium oxide composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Measure 25g of D201 type anion exchange resin (produced by Hangzhou Zhengguang Industrial Co., Ltd., the same below) as a carrier material, place it in 2.5L aqueous solution containing 5% magnesium nitrate, control the reaction temperature at 40°C, fully stir the reaction for 10h, The Mg is gradually diffused to the inner surface of the anion exchange resin pores. Then the resin was filtered and placed in 1500mL of 3% sodium hydroxide solution for in-situ precipitation reaction at room temperature, the precipitation reaction time was controlled to be 10h, after the reaction was completed, it was filtered and heat-treated at 40°C for 5h to obtain the Supported magnesium oxyhydroxide composite materials, such as figure 1 As shown, its loading is 5.9%.

[0024] Put 5mL of the above composite material in a glass adsorption column (ф12×220mm) 4 2- =200mg / L, Cl - =100mg / L,NO 3 - =160mg / L, pH=5) Flow through the adsorption column equipped with composite material from top...

Embodiment 2

[0026] Take 50g of 201x7 type anion exchange resin (manufactured by Tianjin Bohong Resin Technology Co., Ltd.) as a carrier material, place it in 1600mL of 40% magnesium chloride aqueous solution, control the reaction temperature at 60°C, fully stir the reaction for 12 hours, so that Mg can gradually diffuse to the inner surface of the anion exchange resin pores. Then the resin was filtered and placed in 2000mL of 8% sodium hydroxide solution for in-situ precipitation reaction at room temperature, the precipitation reaction time was controlled to be 12h, and after the reaction was completed, it was filtered and heat-treated at 60°C for 8h to obtain the The loaded magnesium oxyhydroxide composite material has a loading capacity of 21.8%.

[0027] Put 30mL of the above composite material in a glass adsorption column (ф20×420mm) and phosphate-containing surface water (P=2mg / L and SO 4 2-=180mg / L, Cl-=200mg / L, NO 3 - =220mg / L, pH=10) Flow through the adsorption column equipped...

Embodiment 3

[0029] Measure 20 g of 717-type anion exchange resin (produced by Nanda Resin Factory in Langfang, Hebei Province) as a carrier material, place it in 400 mL of 30% magnesium nitrate solution, control the reaction temperature at 50 ° C, and fully stir the reaction for 11 hours to make Mg gradually diffuse to The inner surface of the pores of anion exchange resin. Then the resin was filtered and placed in 1500mL of 6% sodium hydroxide solution for in-situ precipitation reaction at room temperature, the precipitation reaction time was controlled to be 11h, after the reaction was completed, it was filtered and heat treated at 50°C for 6h to obtain the The loaded magnesium oxyhydroxide composite material has a loading capacity of 18.9%.

[0030] Put 20mL of the above composite material in a glass adsorption column (ф20×420mm) and phosphate-containing wastewater (P=3mg / L and SO 4 2- =150mg / L, Cl - =220mg / L,NO 3 - =240mg / L, pH=6) Flow through the adsorption column equipped with ...

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Abstract

The invention provides a preparation method of a carrying type laminated hydroxyl magnesium oxide composite material. The preparation method comprises the following steps: adding strong-base anion exchange resin to magnesium nitrate or magnesium chloride; fully agitating to react; filtering; feeding the resin into a sodium hydroxide solution to react under normal temperature; filtering; washing the resin to be neutral; then performing thermal treatment to obtain the carrying type laminated hydroxyl magnesium oxide composite material which has the carrying capacity of 5.9 to 23.6%. According to the preparation method of the carrying type laminated hydroxyl magnesium oxide composite material, the biochemical tail water polluted by phosphate directly flows through a fixed-bed column adsorbing device filled with an adsorption material, and thus the water polluted by phosphate can be efficiently cleaned; phosphate can be desorbed with the mixed solution of NaOH and NaCl once the concentration of phosphate in water exceeds a specified value, the desorbed nanocomposite can be washed with clean water until reaching neutrality, and then the water can be recycled; the biochemical tail water polluted by phosphate and containing lots of conventional anions for competition can be treated by the adsorption material, the drained water contains phosphate at concentration of less than 0.5mg / L, and the adsorption efficiency is high.

Description

technical field [0001] The invention relates to a preparation method for purifying phosphate materials, in particular to a preparation method for purifying biochemical tail water phosphate materials. Background technique [0002] Phosphorus is an essential nutrient for the human body, but if the concentration of phosphorus in the water is too high, it will cause eutrophication, cause algal blooms and red tides, and lead to the death of other organisms in the water body. Today, phosphorus pollution has caused serious consequences and has attracted widespread attention. [0003] At present, the main methods of phosphorus removal are: chemical precipitation, adsorption and ion exchange, biochemical method, membrane treatment, etc. For example, although the chemical precipitation method has good effect and simple operation, it is generally suitable for the removal of high-concentration phosphate and requires the addition of chemicals , produces a large amount of sedimentation s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28
Inventor 张庆瑞张兆祥焦体峰于兴玥杜青纪现凯孙奇娜
Owner YANSHAN UNIV
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