Preparation method of metal carbon material capable of absorbing and reducing refractory pollutants

Abstract

The invention discloses a preparation method of a metal carbon material capable of absorbing and reducing refractory pollutants, which comprises the steps of: uniformly mixing metal micro powder containing Fe powder, a carbonic material and a binder in proportion and drying, then extruding on an extruding machine for molding, carrying out carbonization and activating treatments in a muffle, and naturally cooling to a room temperature to prepare the metal carbon material capable of absorbing and reducing the refractory pollutants. The metal carbon material prepared by the method is mainly applicable to the treatment of refractory halogenated pollutants in sewage, has the reduction and dechlorination effects on the refractory pollutants over 4 times better than that of simple metal micro powder mixture containing the Fe powder in the same proportion and weight under the same treatment conditions, has the advantages of large specific surface area, good reduction activity and low preparation and treatment cost, and in addition, is not easy to harden and passivate, thereby prolonging the service life.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a metal carbon material for absorbing and reducing refractory pollutants. Background technique [0002] With the rapid development of the economy, a large amount of refractory pollutant wastewater is produced in production and life, especially halogenated pollutants, which are widely used in chemical, pharmaceutical, pesticide, leather, machinery, wood preservation and other industries. , container leakage, waste water discharge, and burning into the environment, seriously polluting the atmosphere, soil, groundwater, and surface water. In addition, the method of using chlorine as a disinfectant for drinking water that is widely used in my country will also produce toxic chlorine-containing organic compounds Such as chloroform, chloroalkene, chlorophenol, aldehyde and ketone chloride, etc. Many organic chlorides are considered to have "carcinogenic, ...

AI Technical Summary

Problems solved by technology

At present, the widely used zero-valent metal is Fe scrap material. The metal carbon material is prepared by simply mixing Fe scrap, carbonaceous materials and metal scrap. The metal scrap is Cu scrap or Ni scrap. The metal carbon material obtained by this preparation method is between The contact surface is small, the interface contact resistance is large, and the resistance of electron transfer is large, which is not conducive to the electric reduction and reduces the reduction effect. In addition, this macroscopic mixed preparation method often leads to the enrichment of pollutants on the surface of carbon materials. However, the concentration on the surface of Fe is small, and it is difficult to achieve the promotion of reduction by adsorption on the microscopic level.

In addition, the specific surface area of ​​metal shavings is small, which makes the utilization rate of materials low and increases the amount of materials used

Moreover, the materials of landfill are prone to compaction and passivation, which affects the treatment effect and service life

Enhancing mass transfer by means of a fluidized bed can improve the metal passivation problem, but the density of the fluidized material is high, fluidization is difficult, and the required power consumption is large

Although it is easy to implement by fluidizing the powder, it is difficult to separate the solid and liquid in the subsequent step, and the loss of the powder is serious, which increases the processing cost