Modification of Activated Carbon for Phosphine Adsorption

Experiments were carried out to study the factors influencing modification of activated carbon (AC) and the effect of adsorption of Phosphine (PH₃). Impregnated AC was used as a modified adsorbent and its adsorption capacity for PH₃ was studied in laboratory. The factors influencing modified AC included the type of adsorbent, the type of impregnant and the concentration of impregnant. The adsorption material was selected from 4 kinds of AC (AC1, AC2, AC3, AC4). Then the AC was impregnated with hydrochloric acid (HCl), potassium nitrate (KNO₃) and hexanediol solutions respectively. The results showed the adsorption capability of PH₃ was enhanced after impregnating AC with those solutions. The HCl was better modification solution than KNO₃ and hexanediol. Moreover, the results demonstrated that AC4 was the optimum adsorptive support, HCl was the optimum impregnant, and 5% (mass fraction) was the optimum concentration of impregnant. The adsorption capability of PH3 after modified with 5% HCl was over 7 times than non-modified AC.