科研之友
微信
新浪微博
Facebook
分享链接
摘要
CO32- can compete with phosphate as well as inhibit phosphate adsorption onto calcite surface, however, calcite would be decomposed into calcium oxide at a certain temperature. The adsorption of phosphate onto calcined calcite was investigated in a series of batch experiments and in a wide range of calcination temperature. The results showed that phosphate adsorption was dependent on calcination temperature; adsorption efficiency increased with temperature increased. pH value also affected the process of phosphate removal, phosphate removal rate was 98% at pH 11.5. The results showed that the main mechanisms in phosphate adsorption processes were chemical adsorption, however, XRD and FTIR showed that HAP (hydroxyapatite) was not observed in the precipitation. In multi-variables interaction effects, there were not significant between adsorption process and calcination process, except for a positive interacts only weakly between pH vs holding time.
