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Method for preparing hydrotalcite like compound/attapulgite composite material

A composite material and hydrotalcite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as poor regeneration performance, limited adsorption capacity, incomplete adsorption, etc., and achieve good treatment effect , good regeneration performance, and the effect of improving the utilization rate

Inactive Publication Date: 2013-09-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its adsorption capacity is limited, mainly through physical adsorption and ion exchange adsorption, and there are problems such as incomplete adsorption, large feeding amount, and poor regeneration performance.

Method used

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  • Method for preparing hydrotalcite like compound/attapulgite composite material
  • Method for preparing hydrotalcite like compound/attapulgite composite material
  • Method for preparing hydrotalcite like compound/attapulgite composite material

Examples

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Effect test

preparation example Construction

[0015] The present invention is the preparation method of hydrotalcite-like / attapulgite composite material, and its steps are:

[0016] (1) Add attapulgite clay to distilled water, stir and disperse for 0.5 hours, and prepare a 0.01-0.03% suspension solution;

[0017] (2) Add surfactant, magnesium nitrate and aluminum nitrate in turn, and stir for 0.5h;

[0018] (3) Slowly add the mixed solution containing alkali and sodium carbonate dropwise during stirring, and continue stirring for 1 hour after the dropwise addition is completed;

[0019] (4) After the stirring is completed, let it stand for aging for 1 hour;

[0020] (5) Suction filter until neutral, and dry at 60°C to obtain a finished white composite material.

[0021] The attapulgite clay used above is pure soil. The alkali molar ratio of the above mixed solution is 0.1-0.6 mol / L. Described alkali is sodium hydroxide, or ammonia water. Described surfactant is dodecylbenzenesulfonic acid, or silane coupling agent. ...

Embodiment 1

[0023] Example 1: Weigh 3.0g of attapulgite clay, put it into a 500mL three-neck bottle, add 200mL of water and stir evenly to form a suspension, add 2.0ml of silane coupling agent KH570, 6.4g of magnesium nitrate, and 3.75g of nitric acid in sequence Aluminum, stirred for 0.5h, slowly added dropwise 20mL of a mixed solution containing 2.4g sodium hydroxide and 5.3g sodium carbonate during the stirring, continued to stir for 1h after the dropwise addition was completed, stood for aging for 1h after the stirring was completed, and filtered until neutral, 60 ℃ drying to obtain the finished white composite material. Such as figure 1 Shown is the comparison of the adsorption capacity of the composite material, pure hydrotalcite-like and attapulgite clay. figure 2 Scanned pictures for electron microscopy of composite materials. Such as image 3 As shown, the composite material has an adsorption capacity of 33.14mg / g for Ni(Ⅱ) at pH=6.0.

Embodiment 2

[0024] Example 2: Weigh 3.0g of attapulgite clay, put it into a 500mL three-necked bottle, add 200mL of water and stir evenly to form a suspension, and add 0.5ml of silane coupling agent KH570, 0.64g of magnesium nitrate, and 0.375g of nitric acid to the suspension in sequence Aluminum, stirred for 0.5h, slowly added dropwise 20mL of a mixed solution containing 1.0g sodium hydroxide and 0.53g sodium carbonate during the stirring, continued to stir for 1h after the dropwise addition was completed, stood for aging for 1h after the stirring was completed, and suction filtered until neutral, 60 ℃ drying to obtain the finished white composite material. Such as image 3 As shown, the composite material has an adsorption capacity of 27.26mg / g for Ni(Ⅱ) at pH=6.0.

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Abstract

The invention discloses a method for preparing a hydrotalcite like compound / attapulgite composite material. The method comprises the steps of: (1) adding distilled water to attapulgite clay, agitating and dispersing for 0.5 hour to obtain 0.01-0.03% supernatant solution; (2) sequentially adding a surfactant, magnesium nitrate and aluminium nitrate, agitating for 0.5 hour; (3) slowly dropwise adding a mixed solution containing alkali and sodium carbonate while agitating, continuing agitating for 1 hour after dropwise adding is finished; (4) standing and aging for 1 hour after agitation is finished; and (5) carrying out suction filtration to neutral property, and drying at 60 DEG C, so as to obtain a white composite material product.

Description

technical field [0001] The invention belongs to the field of environmentally friendly adsorption materials, and in particular relates to a preparation method of a hydrotalcite-like / attapulgite composite material used for water treatment. Background technique [0002] Hydrotalcite-like is a double metal hydroxide, which is a mixed metal hydroxide composed of divalent and trivalent metal ions with a layered crystal structure of hydrotalcite, in which part of the divalent metal ions are trivalent in the layer Metal ions are isomorphously replaced with a residual positive charge, which is called structural positive charge. Natural hydrotalcite Mg6Al(OH) 16 CO 3 .4H 2 O is rarely found in nature and is mainly synthesized artificially. Due to the crystal structure characteristics of hydrotalcite-like structure, exchangeable anions and permanent positive charge, it has potential application value in catalysts and sewage treatment. [0003] Attapulgite clay is a hydrous magnesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 徐惠陆海林陈泳吴军霞张宝骞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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