Dissolved Black Carbon as an Efficient Sensitizer in the Photochemical Transformation of 17β-Estradiol in Aqueous Solution

• DOI: 10.1021/acs.est.8b01928
• Publication Date: 2018-08-22T08:11:03Z
• Authors: Zhicheng Zhou; Beining Chen; Xiaolei Qu; Heyun Fu; Dongqiang Zhu
• Keywords: dBc; Quantum yield; Carbon fibers

Dissolved black carbon (DBC) is an important component of the dissolved organic matter (DOM) pool. Nonetheless, little known about its role in photochemical processes contaminants. This study investigated effect DBC on phototransformation 17β-estradiol aqueous solutions under simulated sunlight. Four well-studied humic substances (DHS) were included as comparisons. acted a very effective sensitizer to facilitate 17β-estradiol. The apparent quantum yield for mediated by was approximately six times higher than that DHS at same concentration. Quenching experiments suggested direct reaction with triplet-excited state (3DBC*) predominant pathway phototransformation. mediation efficiency likely due contents aromatic groups and smaller molecular sizes, which facilitated generation 3DBC*. states production 4–8 DHS. results suggest 3DBC* may have considerable contribution overall photoreactivity DOM aquatic systems. Our findings also imply can play contaminants environments.