Preparation and Properties of Rice Husk-based Activated Carbon Using Phosphoric Acid as Activator

Abstract

The rice husk through special processing by phosphoric acid activated and carbonized in one step at a certain temperature. the adsorption of benzene has been measured. The effects of such factors as the ratio of phosphate to rice husks, the activating temperature and time, heating rate and different activation process upon the adsorption properties of active carbon have been investigated. Research shows that, the optimal ratio of phosphate to rice husks was 1:2, the optimal activating temperature is 500 ℃, and the optimal activating time is 3 hours. To reduce the heating rate appropriately can improve the properties of the adsorption of activated carbon for benzene.