The adsorption characteristics of nitrate on activated carbon modified by metals extracted from water treatment residual.

The adsorption of nitrate in aqueous solution on the raw activated carbon and the activated carbon modified by metals extracted from water treatment residual was explored. XRF was showed that the surface of activated carbon was successfully loaded with Al, Fe and other elements, the loading capacity of Fe was 4.61 mg/g,and that of Al was 13. 80 mg/g. The modified activated carbon has a lower specific surface area due to the loading of metal ions in the pores of the modified activated carbon. Batch tests showed that the adsorption of nitrate nitrogen on modified activated carbon fitted the pseudo-second-order model well,and the adsorption isotherm fited the Langmuir model. At 288 IK, the adsorption capacity of nitrate on modified activated carbon was 2. 752 5 mgg,the process of nitrate adsorption on modified activated carbon was entropy increase and exothermic,and it was spontaneous reaction. The nitrate adsorption on modified activated carbon was better under acidic and neutral conditions. [ABSTRACT FROM AUTHOR]