Photodegradation Mechanism Of Phthalate Esters In Aqueous Solution

Phthalates esters（PAEs）,an important chemical raw material,have been widely detected in natural water environment due to their mass production and widespread use,posing a great threat to human health.In recent years,photodegradation has been favored by scientists,and it is also the main route for the migration of PAEs.In this paper,we systematically studied the effects of Fe³⁺,NO₃^-and FA alone on the migration of PAEs and the synergistic effects of halogen ions and FA on the PAEs.In addition,the effects of two-dimensional phosphorene and their synergistic effect with FA on the degradation of PAEs also has been further studied.The results showed that PAEs were unstable under acidic conditions;NO₃^-and FA inhibit the photodegradation of DBP in aqueous solution because of their greater promoting effect than inhibitory effect;Fe³⁺promotes degradation of DBP by generating?OH;2D-BP can be successfully prepared by liquid phase exfoliation method that combined ice-bath ultrasonic,and the prepared phosphorene can produce a large amount of ¹O₂ to rapidly degrade DBP;Cl^-and Br^-inhibited the degradation of DBP when coexisting with FA because of their weak ability to produce ³FA*and the conversion of?OH to RHS,However the addition of FA significantly promoted the degradation of DBP when the concentration of I^-was in the range of 0¹00μM,probably due to the heavy atom effect leading to the production of a large amount of ³FA*,but the promotion was weakened sharply when the concentration of I^-exceeded this range,which can be attributed to a large amount of I^-quenching of ³FA*.In the presence of 2D-BP,the degradation rate of DEHP increased gradually when the concentration of FA was in the range of 0³0 mg/L,but the degradation rate of DEHP decreased when the concentration of FA was increased to 100 mg/L,because FA could adsorb on the surface of phosphorene to protective the nanosheet,and the excited state of the phosphorene is easy to transfer energy to the surface FA to form ³FA*,long-lived ³FA*is conductive to produce large amounts of ¹O₂ and O₂^?-,thereby promoting the rapid degradation of DEHP,but when the concentration of FA is too high,the excess FA will compete with the phosphorene,and the ³FA*easily collides with the ground state FA to inactivate and cause energy loss,resulting in a weakened promotion effect.This paper provides theoretical guidance for the treatment of pollution caused by phthalates esters.