Packed bed column investigation on As(V) adsorption using magnetic iron oxide/bagasse biomass carbon composite adsorbent

Abstract

In this study, the magnetic iron oxide/bagasse biomass carbon composite adsorbent(M-Fe3O4-BC) was achieved by the microwave precipitation one-step carbonization heating chemical modification method with bagasse as the main raw material. The effects of initial As(V) concentration, solution pH, solution flow rate and bed height on the breakthrough curve of M-Fe3O4-BC adsorption As(V) were studied. The results shown that the penetration time was shortened with growing initial As(V) concentration, solution pH and solution flow rate, and it lengthened with growing bed height. The exhaustion time was prolonged with increasing initial As(V) concentration and height of bed, and the influence of solution pH on the exhaustion time was not significant. When the solution flow rate is lower than 1.5 ml/min, the exhaustion point was not reached within 2000 min, and the exhaustion time was 720 min when the solution flow rate was 2.0 ml/min. The regenerated adsorbent still maintained a high adsorption capacity for As(V).