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Preparation method of calcium hydroxide nano particles with high adsorption activity

A technology of calcium hydroxide and nanoparticles, which is applied in the field of preparation of calcium oxide nanoparticles, and can solve problems such as powder instability and low specific surface area

Inactive Publication Date: 2014-10-01
ENG DESIGN & RES INST OF GENERAL ARMAMENTS DEPT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ca(OH) currently produced by CaO digestion process 2 Powder, the specific surface area is 20~25m 2 / g; and prepared by liquid phase chemical precipitation, the specific surface area is also low, generally 2 / g, which is due to Ca(OH) 2 Powder is particularly unstable

Method used

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  • Preparation method of calcium hydroxide nano particles with high adsorption activity
  • Preparation method of calcium hydroxide nano particles with high adsorption activity
  • Preparation method of calcium hydroxide nano particles with high adsorption activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Weigh 22.2g CaCl 2 , put into a 250ml three-neck bottle, add 80ml deionized water to dissolve, and stir with a magnetic stirrer;

[0019] 2. Weigh 0.47g of SDS into the three-necked bottle, stir to dissolve;

[0020] 3. Weigh 8.0g of NaOH and dissolve it in 20ml of deionized water, drop it into a three-necked bottle at a rate of 40ml / h, and stir for 0.5h.

[0021] 4. After the slurry obtained by the reaction was suction-filtered, it was washed twice with distilled water and then twice with ethanol, and finally the filter cake was vacuum-dried at 60°C for 24 hours.

Embodiment 2

[0023] 1. Weigh 22.2g CaCl 2 , put into a 250ml three-neck bottle, add 80ml deionized water to dissolve, and stir with a magnetic stirrer;

[0024] 2. Weigh 1.17g of SDS into the three-necked bottle, stir to dissolve;

[0025] 3. Weigh 8.0g NaOH and dissolve it in 20ml deionized water, drop it into the three-necked bottle at a rate of 40ml / h, and stir for 1.5h.

[0026] 4. After the slurry obtained by the reaction was suction-filtered, it was washed twice with distilled water and then twice with ethanol, and finally the filter cake was vacuum-dried at 60°C for 24 hours.

Embodiment 3

[0028] 1. Weigh 22.2g CaCl 2 , put into a 250ml three-neck bottle, add 80ml deionized water to dissolve, and stir with a magnetic stirrer;

[0029] 2. Weigh 2.34g of SDS into the three-necked bottle, stir to dissolve;

[0030] 3. Weigh 8.0g of NaOH and dissolve it in 20ml of deionized water, drop it into a three-necked bottle at a rate of 40ml / h, and stir for 2.5h.

[0031] 4. After the slurry obtained by the reaction was suction-filtered, it was washed twice with distilled water and then twice with ethanol, and finally the filter cake was vacuum-dried at 60°C for 24 hours.

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Abstract

The invention discloses a preparation method of calcium hydroxide nano particles with high adsorption activity. The preparation method is characterized by comprising the following steps: putting CaCl2 in a three-necked bottle; adding deionized water to dissolve the CaCl2; stirring with a magnetic stirrer; weighing SDS or PEG, wherein the mass ratio is as follows:CaCl2:SDS is equal to 22.2:(0.47-2.34) or CaCl2:SDS is equal to 22.2:(2.65-14.44); adding SDS or PEG into the three-necked bottle; stirring to dissolve; dissolving NaOH in the deionized water, wherein mass ratio of the CaCl2 to the NaOH is 22.2:8;dropwise adding an obtained solution to the three-necked bottle at the speed of 40ml / h; stirring to react for 0.5-2.5 hours to obtain slurry; performing suction filtering on the slurry; and washing and drying. According to the preparation method, the prepared Ca(OH)2 power body is uniform in particles and are in single dispersion; the particle granularity is 200-300nm and the specific surface area is 88m<2> / g; the maximum N2 adsorption amount can reach 80ml / g; meanwhile the removal rate of NOx can reach 98%; the preparation method has important practical significance on leakage treatment of liquid propellant N2O4 at a space launching site.

Description

technical field [0001] The present invention relates to dinitrogen tetroxide (N 2 o 4 ) The field of materials with adsorption conversion function is a preparation method of calcium hydroxide nanoparticles with high adsorption activity. Background technique [0002] Liquid propellant dinitrogen tetroxide (N 2 o 4 ) in the event of a leak, it can quickly volatilize and transform into red nitrogen dioxide (NO 2 )gas. Momentary high concentration of NO 2 The gas can cause pulmonary edema and chemical pneumonia of the operator, and even lead to death by suffocation. A large amount of volatilized NO 2 Gases are not only the main cause of acid rain, but also form photochemical smog in the air, polluting the environment. Therefore for the liquid propellant N 2 o 4 It is very necessary to quickly and effectively absorb and capture the leaked volatile gas and safely dispose of the residual liquid. Ca(OH) 2 Powder can capture N through adsorption and acid-base neutralizati...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/28B01J20/30
Inventor 侯瑞琴杜玉成孙广兵王金淑郑广伟张统
Owner ENG DESIGN & RES INST OF GENERAL ARMAMENTS DEPT
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