Abstract：
:Humic substances (HS) including humic acid (HA) and fulvic acid (FA) are ubiquitous in the natural waters. Although numerous studies documented their role in photodegradation of organic pollutants, the competitive effects of photosensitization and light-screening of HS on the photodegradation of pollutants are not yet clear. In this work, the role of HS in the photodegradation of the pharmaceutical naproxen (NP) was studied under simulated sunlight. The direct photodegradation quantum yield of NP in deionized water was 2.1 × 10-2, and the apparent quantum yields for photosensitized degradation of NP in the presence of FA and HA were 2.3 × 10-4 and 2.6 × 10-5, respectively. Both direct and photosensitized photodegradation decreased with increasing pH, consistent with the trend of singlet oxygen (1O2) reaction rate constants of NP. HA inhibited the photodegradation of naproxen thoroughly. In contrast, FA accelerated the photodegradation of NP at lower substrate concentration and light intensity, and vice versa. Direct photodegradation of NP declined sharply with spectral radiation attenuation of UV region, when HS-mediated photosensitization predominantly accounted for the photodegradation. The direct photodegradation was ascribed to decomposition of excited triplet state of naproxen (3NP∗) and self-sensitization effect involving 1O2. The FA-mediated photodegradation was mainly attributed to 1O2 oxidation in aerated solution. These findings are important for assessing the competitive effects of humic substances on the photodegradation of pollutants under various conditions in natural waters.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chen Y,Liu L,Su J,Liang J,Wu B,Zuo J,Zuo Ydoi
10.1016/j.chemosphere.2017.08.110subject
Has Abstractpub_date
2017-11-01 00:00:00pages
261-267eissn
0045-6535issn
1879-1298pii
S0045-6535(17)31333-4journal_volume
187pub_type
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