Method for preparing silver-loaded activated charcoal through low-temperature reduction and pyrolysis of urea

A technology of silver-loaded activated carbon and activated carbon, which is applied in botany equipment and methods, chemicals for biological control, animal repellents, etc., and can solve the problem of long reduction process, low sterilization efficiency, and high water resource requirements. problems, to achieve the effect of improving sterilization efficiency, reducing silver consumption, and high sterilization efficiency

Active Publication Date: 2017-04-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process flow of the reduction method is long; multiple washings are required, and the water resource requirements are high; light-shielding, vacuum and other processes are used, and the equipment requirements are

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of silver nitrate-urea complex solution: Weigh 17g of silver nitrate and 6g of urea, dissolve in distilled water to obtain 100 liters of silver ammonium nitrate complex solution. Among them, the molar ratio of silver nitrate to urea is 1:1, and the mass concentration of Ag ions in the prepared aqueous solution is about 0.01%.

[0028] (2) Soaking and drying activated carbon with silver ions: Wash the commercially available coconut shell charcoal with distilled water, dry it, and let it cool. Use silver nitrate-urea complex solution with Ag ion mass concentration of about 0.01% to oscillate at room temperature and soak activated carbon for 6 hours; the ratio of activated carbon to complex solution is 1Kg / liter during soaking; after soaking, place it in a ventilated environment, avoid Filter and dry in a light environment; dry in an electric blast drying oven at 50°C to constant weight, and remove water and crystal water.

[0029] (3) Thermal decompositio...

Embodiment 2

[0033] (1) Preparation of silver nitrate-urea complex solution: Weigh 17 g of silver nitrate and 6 g of urea, dissolve in distilled water to obtain 18 liters of silver ammonium nitrate complex solution. Among them, the molar ratio of silver nitrate to urea is 1:1, and the mass concentration of Ag ions in the prepared aqueous solution is about 0.6%.

[0034](2) Soaking and drying activated carbon with silver ions: Wash the commercially available coal-based carbon with distilled water, dry it, and let it cool. Use the silver nitrate-urea complex solution with a Ag ion mass concentration of about 0.6% to oscillate at room temperature and soak the activated carbon for 24 hours; the ratio of activated carbon to the complex solution is 1Kg / liter during soaking; Filter and dry in a light environment; dry in an electric blast drying oven at 100°C to constant weight, and remove water and crystal water.

[0035] (3) Thermal decomposition reaction: After soaking and drying, the activate...

Embodiment 3

[0039] (1) Preparation of silver nitrate-urea complex solution: Weigh 17g of silver nitrate and 9.6g of urea, dissolve in distilled water to obtain 18 liters of silver ammonium nitrate complex solution. Among them, the molar ratio of silver nitrate to urea is 1:1.6, and the mass concentration of Ag ions in the prepared aqueous solution is about 0.6%.

[0040] (2) Soaking and drying activated carbon with silver ions: Wash the commercially available fruit shell carbon with distilled water, dry it, and let it cool. Use silver nitrate-urea complex solution with a mass concentration of Ag ions of about 0.6% and a molar ratio of 1:1.6 to shake at room temperature and soak activated carbon for 12 hours; the ratio of activated carbon to complex solution during soaking is 0.25Kg / liter ; After soaking, filter and dry in a ventilated and light-proof environment; dry in a hot air drying cylinder at 80°C to constant weight, and remove water and crystal water.

[0041] (3) Thermal decompos...

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Abstract

The invention relates to a method for preparing silver-loaded activated charcoal through low-temperature reduction and pyrolysis of urea. The silver-loaded activated charcoal is prepared through preparing a silver nitrate and urea complexing solution, carrying out activated charcoal infiltration and carrying out pyrolysis and reduction. The method comprises the steps: firstly preparing the silver nitrate-urea complexing solution, of which the mole ratio of silver nitrate to urea is (1 to 0.625): 1 and the mass concentration of Ag ions is 0.01% to 0.6%; carrying out soaking for 6 to 24 hours in accordance with that the ratio of activated charcoal to the complexing solution is 0.25Kg/L to 1Kg/L; carrying out pyrolysis under circulating nitrogen protection; and carrying out washing with clean water, and then, carrying out drying, thereby obtaining the silver-loaded activated charcoal. The particle size of nano-silver is 10nm to 60nm; the loaded silver amount is 0.01wt.% to 0.4wt.%; the binding power between silver particles and the activated charcoal is high, and the rate of loss of silver is not higher than 30% under the conditions of 150r/min and 600 hours of oscillation in constant-temperature water with the temperature of 25 DEG C; and the dispersity of the silver particles is good, process flows are shortened, the reaction temperature is lowered, the fungicidal efficiency of the silver-loaded activated charcoal is increased, and the consumption of silver is lowered.

Description

technical field [0001] The invention relates to a method for carrying silver activated carbon. It uses silver nitrate and urea complex solution, then impregnates activated carbon, and after thermal decomposition and reduction, uses the reaction heat of silver nitrate and urea complex to obtain highly stable activated carbon surface to adsorb nano-silver, which is used for pure water Purification and sterilization etc. [0002] technical background [0003] The invention belongs to the activated carbon material modified by nano particle silver in the field of purification, sterilization and the like. [0004] Activated carbon (AC) for deep purification of drinking water at home and abroad is usually mainly loaded with silver. The preparation methods of silver-loaded activated carbon (AC / Ag) mainly include impregnation method, doping method, electrochemical deposition method, reduction method, supercritical water impregnation method, etc. The most industrial applications are ...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01P1/00
CPCA01N59/16
Inventor 罗丰华吴若晴向剑波余罡
Owner CENT SOUTH UNIV
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