Cotton stalks: phosphoric acid;  Activated carbon

China is a big cotton producer, and most of the cotton stalks have not been further developed and utilized. In this experiment, cotton stalks were used as raw materials, decolorization activated carbon was prepared from cotton stalks by phosphoric acid method, and the process conditions such as carbonization and activation were studied, and the experimental results showed that the yield and decolorization performance of the product were stable, and the consumption of activator was small, which provided ideal experimental conditions for converting cotton stalks into activated carbon.