Technique Research on the Preparation of Activated Carbon with Phosphoric Acid

To prepare activated carbon,sawdust was impregnated in phosphoric acid,then activated in high temperature.The main parameters such as temperature,holding time and the concentration were studied to show the effect on the adsorption capabilities of the activated carbon.It was found that with the increase of temperature and holding time,methylene blue,iodine,benzene adsorption values of activated carbon showed overall upward trend.With the increase of the concentration of phosphoric acid,the methylene blue and iodin adsorption values of activated carbon decreased to a low value and then increased.Under optimized experimental conditions,the adsorption values of methylene blue,iodine and benzene of activated carbon were 330 mg·g-1,1 015.7 mg·g-1 and 59.2%,respectively.