Adsorptive As (III) removal from water sources using cerium (IV) oxide nanocomposite in Continuous mode

In this study, nanocomposite of ceria sawdust (CeO2/SD) synthesized by precipitation method was utilized for removal of As (III) from aqueous solution. Study of the process was done in column systems. Characterization of the nano sized adsorbent particles was carried out using XRD and SEM techniques. The effects of important parameters, such as the value of initial pH, the flow rate, the influent concentration of arsenic and bed depth were studied in the column system. The Thomas model was applied for treatment of the adsorption data at different flow rate, influent concentration and bed depth. The bed-depth/service time analysis (BDST) model was also applied at different bed depth to predict the breakthrough curves. The two models were found suitable for describing the biosorption process of the dynamic behavior of the CeO2/SD adsorbent in column investigation. All the results suggested that presented nanocomposite as an efficient adsorbent for removal of As (III) from aqueous solutions. When the flow rate was 2 mL min−1 and the influent concentration of As (III) ions was 10 mg L-1, the equilibrium adsorption reached 8.28 mg g−1 according to Thomas model.

کلیدواژه ها:

Nanocomposite ، Ce(IV) oxide ، Arsenic ، Removal ، Thomas model