Abstract
Large amount of phosphorous is the main factor for eutrophication. Removal of orthophosphate and pyrophosphate with CaFe-Cl-LDHs was explored in the paper. And the aim of this paper was to investigate the different mechanisms of orthophosphate and pyrophosphate removal by CaFe-Cl-LDHs. The results displayed that the removal process was precipitation-dissolution between Ca2+ and orthophosphate or pyrophosphate, which was fitted with the pseudo-second-order equation well; when Ca2+ was not enough, pyrophosphate had a competitive advantage over orthophosphate; as the concentration of pyrophosphate increased, precipitate was formed by Ca2+ and . The simultaneous removal of orthophosphate and pyrophosphate on CaFe-Cl-LDHs was also evaluated to provide information for the treatment of domestic and industrial wastewaters.
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