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Method for preparing composite modified montmorillonite sorbent

A composite modification, montmorillonite technology, used in chemical instruments and methods, silicon compounds, silicates, etc., can solve problems such as unsatisfactory thermal stability, small interlayer spacing and specific surface area, and achieve increased specific surface area, The effect of high desorption rate and simple implementation process

Inactive Publication Date: 2010-03-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to basically overcome the disadvantages of existing modified montmorillonite adsorption effects such as the ubiquitous interlayer spacing and specific surface area, and unsatisfactory thermal stability, thereby providing a composite modified montmorillonite with low production cost. A preparation method of montmorillonite adsorbent, the montmorillonite adsorbent prepared by the method has high adsorption efficiency and can be reused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Slowly add 120mL 0.2mol / L NaOH solution dropwise to 50mL 0.2mol / L AlCl 3 solution, under 50°C water bath, continuously stirred for 16 hours to obtain polyhydroxy aluminum pillaring solution; 1g of montmorillonite was dissolved in 100mL water to make a suspension containing 1wt% of montmorillonite; 1g of polyvinyl alcohol was dissolved in 100mL In water, stir continuously at 70°C to prepare a 1wt% polyvinyl alcohol solution; add the above-mentioned montmorillonite suspension dropwise to the above-mentioned polyhydroxyaluminum pillar liquid, and continue stirring for 1 hour at 50°C; then add the above-mentioned polyvinyl alcohol Vinyl alcohol solution was added dropwise to the mixture, stirring was continued for 2 hours and then cooled to room temperature. The mixture was washed with water until AgNO 3 Detection does not contain Cl -Afterwards, centrifugal separation, the product is dried in an oven, and ground. The obtained powder sample was calcined at 350°C under a ...

Embodiment 2

[0027] Slowly add 120mL 0.35mol / L NaOH solution dropwise to 50mL 0.35mol / L AlCl 3 In the solution, stir continuously for 20 hours in a water bath at 70°C to obtain a polymeric hydroxyl aluminum pillaring solution; dissolve 3g of montmorillonite in 100mL of water to form a suspension containing 3wt% of montmorillonite; dissolve 2g of polyvinyl alcohol in 100mL In water, stir continuously at 80°C to prepare a 2wt% polyvinyl alcohol solution; add the above-mentioned montmorillonite suspension dropwise to the above-mentioned polyhydroxy aluminum pillar liquid, and continue stirring for 3 hours at 70°C; then add the above-mentioned polyvinyl alcohol Vinyl alcohol solution was added dropwise to the mixture, stirring was continued for 2.5 hours and then cooled to room temperature. The mixture was washed with water until AgNO 3 Detection does not contain Cl - Afterwards, centrifugal separation, the product is dried in an oven, and ground. The obtained powder sample was calcined at ...

Embodiment 3

[0029] Slowly add 120mL 0.2mol / L NaOH solution dropwise to 21.8mL 0.5mol / L AlCl 3 solution, under 80°C water bath, stirred continuously for 18 hours to obtain polymeric hydroxyl aluminum pillaring solution; 2g montmorillonite was dissolved in 100mL water to make a suspension containing 2wt% montmorillonite; 2g polyvinyl alcohol was dissolved in 100mL In water, stir continuously at 80°C to prepare a 2wt% polyvinyl alcohol solution; add the above-mentioned montmorillonite suspension dropwise to the above-mentioned polymerized hydroxyaluminum pillar liquid, and continue to stir for 2 hours at 80°C; then add the above-mentioned polyvinyl alcohol Vinyl alcohol solution was added dropwise to the mixture, stirring was continued for 2 hours and then cooled to room temperature. The mixture was washed with water until AgNO 3 Detection does not contain Cl - Afterwards, centrifugal separation, the product is dried in an oven, and ground. The obtained powder sample was calcined at 450° ...

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Abstract

The invention relates to a method for preparing composite modified montmorillonite sorbent. The method comprises the following steps: adding montmorillonite suspension into hydroxy aluminum pillared solution; then, adding polyvinyl alcohol into the mixed solution; heating and stirring the mixed solution under rising temperature; washing the mixed solution until Cl<-> free after the mixed solutionis cooled; centrifuging, drying and grinding the mixed solution to obtain a powdered product; and calcining the powdered product under nitrogen atmosphere, refluxing the powdered product by sulphuricacid, washing filtered solid to obtain the composite modified montmorillonite sorbent. The invention can acquire the composite modified montmorillonite sorbent with specific surface area up to 192m<2> / g and evenly distributed bore diameter through low-price and available raw materials and simple method, and ensures that the maximum adsorption amount of the sorbent when adsorbing Cd<2+> containingsolution reaches 27.92mg / g.

Description

technical field [0001] The invention relates to a preparation method of a composite modified montmorillonite adsorbent. Background technique [0002] Montmorillonite, also known as bentonite, is an aluminosilicate mineral with a layered structure of 2:1. my country's montmorillonite resources are very rich. Montmorillonite has excellent properties such as large specific surface area, strong ion exchange capacity, and good adsorption performance. At the same time, it has favorable factors such as abundant reserves, wide sources, and low cost. It can be used as an adsorbent to remove pollutants in the environment. It is an extremely Development prospects of environmental materials. By modifying montmorillonite, desorbing water or structural water, changing its microstructure, can enhance its adsorption capacity and ion exchange capacity. Compared with the previous treatment methods, using modified montmorillonite to treat heavy metal ions in wastewater has the advantages of ...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30
Inventor 朱荣海王丹王胜东于然波毛丹邢朝建
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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