FIXED-BED COLUMN SORPTION OF ANTIMONY(III) BY POROUS COMPOSITE OF IRON OXIDES AND CARBON WITH EUCALYPTUS WOOD MICROSTRUCTURE

摘要

The fixed-bed column sorption-desorption of antimony(III) by porous composite of iron oxides and carbon with eucalyptus wood microstructure was experimentally studied. The breakthrough curves indicated that a larger sorbent mass and a smaller sorbent grain size prolonged the column life span. The increased influent concentration and flow rate caused the column exhaustion to occur earlier. The solution pH and operating temperature had negligible influence. All breakthrough curves could be well predicted with the Thomas, Yoon-Nelson and Clark models. The equilibrium sorption capacity reached 18.47 mg/g, which was near the predicted value of 18.64 mg/g according to the Thomas model. The sorption capacity of the unpulverized material as a novel filtration sorbent is comparable to fine particles of the pulverized material, synthetic and natural iron oxides.