Enhanced removal of glyphosate from aqueous solution by nano-CaO2/AS composite: Oxidation and precipitation

The main mechanism for the removal of glyphosate was the synergistic effect of advanced oxidation and chemical precipitation, and O- 2• and OH• were the main active substances in the nano-CaO2/AS reaction system. Glyphosate can be effectively mineralized into inorganic substances. The oxidated products of glyphosate were combined with Ca2+ dissolved from nano-CaO2 in solution to form CaHPO4·2H2O precipitation. The P-laden solid precipitation produced in this reaction system can be directly recycled back to soil to improve the phosphorus quality of soil and promote the growth of seedlings.