Preparation and characterization of modified activated carbon for purification of PH_3 and H_2S

Activated carbon 4# (AC4) was modified with Cu-containing impregnant and the factors influencing its preparation were investigated. Fresh activated carbon, modified activated carbon, and modified activated carbon saturated with PH3 and H2S were characterized by N2-BET、XPS and TG/DTA. The highest efficiency of the modified AC sorbent was reached at a temperature of 250℃. Phosphorus and sulfur were mainly adsorbed in pores of 1~8 nm in size. PH3 and H2S can be decomposed by activated carbon modified with copper cations and the adsorbed products are phosphoric acid and sulfur.