Preparation method of silver-loaded activated carbon

Abstract

The invention discloses a preparation method of silver-loaded activated carbon, which comprises the steps that raw carbon is washed with dilute nitric acid and then with clear water, the carbon is immersed into a silver nitrate aqueous solution and dried after being soaked, a reduction solution is prepared with ammonia water and organic acid, the dried carbon is poured into the reduction solution for stirring, wet silver-loaded activated carbon is obtained after cooling, and the silver-loaded activated carbon is obtained after drying. According to the preparation method, as the raw carbon is washed with the dilute nitric acid and then with the clear water, impurity elements on an inside wall of a raw material to be loaded with silver are removed, so that silver ions can enter the porous inside wall of the raw activated carbon smoothly. With the adoption of the reductant prepared by the ammonia water and the organic acid, the silver ions are reduced to element silver, and the element silver is firmly adsorbed into the internal pores of the activated carbon, and completely loaded into the activated carbon. The preparation method has the advantages that no pollution is caused, the price is low, the preparation method is feasible and the cost is low. The silver-loaded activated carbon prepared by the method can effectively sterilize drinking water in the purification process, and ensures that silver in the water is not over proof. In addition, the activated carbon has a long service life.

Description

technical field [0001] The invention belongs to the technical field of activated carbon, and in particular relates to a new preparation method of silver-loaded activated carbon. Background technique [0002] In the previous method of silver-loaded activated carbon, the raw carbon was first soaked in silver nitrate directly, and then used after drying. The silver ions easily entered the effluent water and exceeded the sanitary standard for drinking water, and the service life was short. In addition, the raw charcoal is washed with water, soaked in silver nitrate, and reduced with HCL. The silver utilization efficiency of this method is low, and the CL contained in the effluent will exceed the standard. There is another method to restore with KI, which is more expensive and increases the cost. It is also reported that spherical silver-loaded carbon airgel particles are prepared by an expensive gel method, which cannot be commercialized. Contents of the invention [0003] T...

AI Technical Summary

Problems solved by technology

[0002] In the previous method of silver-loaded activated carbon, the raw carbon was used to soak silver nitrate directly at first, and then used after drying. Silver ions easily entered the effluent water and exceeded the sanitary standard for drinking water, and the service life was short.

In addition, the raw carbon is washed with water, soaked in silver nitrate, and reduced with HCL. This method has low silver utilization efficiency, and CL in the effluent will exceed the standard.

There is another way to use KI to restore, KI is more expensive and increases the cost

It is also reported that spherical silver-loaded carbon airgel particles are made by expensive gel method, which cannot be commercialized