ENHANCED REMOVAL OF AS(V) FROM WATER WITH IRON-COATED SPENT CATALYST

The effectiveness of pretreating a spent catalyst with an iron-salt so lution to improve its As(V) removal capacity was studied. Various fact ors, such as types and concentrations of iron salt, pH, and initial As (V) concentration were investigated for their effects on the improveme nt of As(V) removal capacity. A significant increase in As(V) removal capacity can be achieved by iron-coated spent catalyst. Adsorption den sity of As(V) decreased with increasing pH. Langmuir adsorption isothe rm was utilized to describe the adsorption reaction. Results from IR a nalysis and zeta potential measurement indicate that As(V) is specific ally adsorbed onto iron-coated spent catalyst. This study shows that s pent catalyst can be converted to a useful adsorbent for As(V) removal .