EB-radiolysis of carbamazepine: in pure-water with different ions and in surface water
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The electron beam (EB) radiolysis characteristics of carbamazepine (CBZ) in pure-water with different ions and that in surface water were studied in this paper. It suggested that the ·OH, ·H and e aq − all played roles on CBZ EB degradation, and the ·OH played the vital role. Acidic solution was favorable for CBZ degradation, while alkaline environment inhibited it. HSO4 – and SO3 2− enhanced the CBZ degradation, but CO3 2−, NO2 −, NO3 − NH4 + and Cl− inhibited. In surface water, the EB-radiolysis was an effective way to degrade CBZ; and CBZ might evolve in three different ways during EB radiation: reduction by e aq − and ·H (intermediate 10,11-dihydrocarbamazepine (I)), oxidization by ·OH (intermediates 10,11-dihydro-10-11-expoxycarbamazepine (II) and 2(3)-hydroxycarbamazepine (III)) and hydration into 10,11-dihydro-10-hydroxycarbamazepine (IV) and finally the intermediates were all mineralized into CO2, H2O, N2 and NH4 +. All the results contribute to study the EB-radiolysis of pharmaceuticals in surface water.
KeywordsCarbamazepine (CBZ) Electron beam radiolysis Ions Surface water
This work was financially supported by the National Natural Science Foundation of China (Nos. 11175112, 11025526, 41173120, 11305099 and 41273141).
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