Ceramic Filter Balls Loaded with α ‐Fe 2 O 3 and Their Application to NH 3 ‐N Wastewater Treatment

Hydrolysis reaction of Fe(NO 3 ) 3 at a high temperature in the presence of urea as the homogeneous precipitant was studied. With the prepared ceramic filter balls loaded with α ‐Fe 2 O 3 after high temperature calcination, the loading of α ‐Fe 2 O 3 on the porous ceramic filter balls from Fe(NO 3 ) 3 solutions of different concentrations and mechanical stability of the loaded α ‐Fe 2 O 3 were studied. The product was characterized using XRD and SEM. Adsorption experiments were conducted to evaluate the performance of the product in adsorbing NH 3 ‐N. It turned out that the specific surface area of the ceramic filter balls loaded with α ‐Fe 2 O 3 had increased to 36.5387 m 2 /g from original 4.6127 m 2 /g. When the concentration of Fe(NO 3 ) 3 was 0.40 mol/L, the loading of α ‐Fe 2 O 3 on the ceramic filter balls accounted for 8.4% of the total mass of the adsorbent and α ‐Fe 2 O 3 was adsorbed on the filter balls very well. The adsorption isotherm of NH 3 ‐N on the ceramic filter ball adsorbent loaded with α ‐Fe 2 O 3 was of Langmuir type. The saturated adsorption capacity was 3.33 mg/L, and the adsorption constant K was 0.1873. NH 3 ‐N was adsorbed by α ‐Fe 2 O 3 more easily, which was a kind of specific adsorption.