Correlation Characteristics of Water Purification Activated Carbon Adsorption Index

Commonly used activated carbon is an adsorbent composed of amorphous carbon and different amounts of ash. It has a relatively developed micropore structure and excellent adsorption performance. This includes the sugar industry, food industry, air and water purification, flue gas purification, etc. . Activated carbon has played an increasingly important role in water treatment applications in recent years. Its application in water purification began with the practice of using it to eliminate odors in water. It is the earliest and most widely used water purification material.

The technical index test results of activated carbon performance are an important basis for evaluating the quality of activated carbon. Common adsorption indicators that determine the performance of activated carbon include iodine adsorption value, methylene blue adsorption value, carbon tetrachloride adsorption rate, specific surface area, etc.  Routine detection and methods of activated carbon，The iodine adsorption value is generally a characterization value of activated carbon's true micropores (pore diameter 1 to 10 A), which can be used to characterize the total surface area of activated carbon and to measure whether the activated carbon has been activated. The methylene blue adsorption value indicates the degree of development of submicropores (pore diameters between 6-7 A and 15-1 6 A) in the pore structure of activated carbon. The carbon tetrachloride adsorption rate reflects the adsorption capacity of activated carbon to the gas phase ，Specific surface area is the main adsorption index of activated carbon, which represents the adsorption capacity of activated carbon. In a sense, it explains the reason for the adsorption of activated carbon.

Under normal circumstances, there is a significant positive correlation between the iodine adsorption value of activated carbon and the specific surface area. As the iodine adsorption value increases, the specific surface area will also increase, and the absolute difference between the iodine adsorption value and the specific surface area is basically Around 100. Therefore, the iodine adsorption value can be used to quickly estimate the specific surface area. There is a positive correlation between the iodine adsorption value of activated carbon and the carbon tetrachloride adsorption rate. Generally, samples with a large iodine adsorption value will have a relatively large carbon tetrachloride adsorption rate. However, due to the production or structural characteristics of the sample itself, there may also be abnormal correspondences. The iodine adsorption value of activated carbon and the methylene blue adsorption value are highly correlated under normal circumstances.