Preparation and regeneration method suitable for large particle diameter activated carbon capable of adsorbing heavy metal ions

Abstract

The invention provides preparation and a regeneration method suitable for large particle diameter activated carbon capable of adsorbing heavy metal ions. The activated carbon prepared by the method disclosed by the invention can achieve effective adsorption on metal ions in a liquid phase, technology in an activated carbon preparation process is simple, the activated carbon with better adsorptioncan be prepared without extra sulfonation treatment, and the technological process reduces cost; compared with a product of sulfonating the activated carbon or compared with a product which is not subjected to metal loading modification treatment and treated, the activated carbon has stronger adsorption capacity to metal ions. The activated carbon can be regenerated by the regeneration method, andthe adsorption capacity can be still kept at a higher level after the activated carbon is regenerated. The regeneration method has the characteristics of simple technological process, mild reaction condition, low preparation cost and the like. The regeneration method is especially suitable for the large particle diameter activated carbon capable of adsorbing heavy metal ions, and the regenerationmethod can achieve desorption of adsorbate in apertures of the activated carbon.

Description

technical field [0001] The invention belongs to the technical field of activated carbon regeneration, and in particular relates to a method for preparing and regenerating activated carbon suitable for large particle size and adsorbing heavy metal ions. Background technique [0002] The serious harm of heavy metal wastewater to public health and the ecological environment has long attracted widespread attention at home and abroad. Since heavy metal ions exist in dilute phases in wastewater, activated carbon adsorption technology has incomparable advantages for deep purification of heavy metal wastewater. However, the regeneration of activated carbon after adsorption has always been a subject of concern, and the regeneration effect directly affects the feasibility of the regeneration operation. [0003] Activated carbon regeneration refers to the process of removing the adsorbate adsorbed on the micropores of activated carbon and restoring its adsorption performance by physica...

AI Technical Summary

Problems solved by technology

However, the regeneration of activated carbon after adsorption has always been a subject of concern, and the regeneration effect directly affects the feasibility of the regeneration operation.

Among them, the thermal regeneration method is mainly suitable for the regeneration of activated carbon that adsorbs organic matter. It realizes the regeneration of activated carbon according to the different changes of organic matter at different temperatures. It can be divided into drying, high-temperature carbonization and activation stages; The organic matter adsorbed on the activated carbon is vaporized and desorbed, or heated and decomposed, and desorbed as small molecular substances; in the activation stage, water vapor or carbon dioxide is passed through to clean the micropores of the internal structure of the activated carbon and restore its activity. It is not suitable for activated carbon adsorbed on metal ions, and the carbon loss in the high-temperature carbonization process is relatively serious, which can reach 5-10%, and the mechanical properties after regeneration are also reduced; the biological regeneration method uses the metabolism of microorganisms to adsorb on However, the pore size of activated carbon is generally only a few nanometers, and it is difficult for microorganisms to desorb the adsorbate in the pore size, and the microbial regeneration method has a long operating cycle and high requirements for the regeneration environment. The cost is high, and at the same time, most microorganisms are selective, so it is difficult for them to decompose all the adsorbed substances

[0004] For other traditional activated carbon regeneration methods, there are still the following defects. The carbon content of activated carbon is greatly lost, and the adsorption capacity after regeneration is significantly reduced. Most regeneration methods are not suitable for activated carbon that adsorbs metal ions, etc.