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Effect of dissolved organic matter fractions on photodegradation of phenanthrene in ice

Author:
Xue, Shuang, Sun, Jijun, Liu, Ying, Zhang, Zhaohong, Lin, Yingzi, Liu, Qiang
Source:
Journal of hazardous materials 2019 v.361 pp. 30-36
ISSN:
0304-3894
Subject:
binding capacity, dissolved organic matter, hydrophilicity, hydrophobicity, hydroxyl radicals, ice, phenanthrenes, photolysis, resins, screening, singlet oxygen, surface water, wastewater
Abstract:
The effect of dissolved organic matter (DOM) fractions on photodegradation of phenanthrene (PHE) in ice was investigated. DOM in surface water and wastewater samples was fractionated using XAD-8/XAD-4 resins into five fractions: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). The photodegradation rate of PHE in ice was about 40% greater than that in water. The screening effect and quenching effect contributed 3–12% and 88–97% toward the inhibition of DOM fractions on PHE photodegradation in ice, respectively. The contribution ratios of singlet oxygen (¹O2) and hydroxyl radical (OH) produced from DOM fractions to PHE photodegradation rates in ice were 9–31% and 2–13%, respectively. Among five DOM fractions, HPO-A was most efficient in advancing PHE photodegradation in ice through ¹O2 mechanism. When excluding the photosensitized effect of ¹O2 and OH produced from DOM fractions, the quencing effect of DOM fractions on PHE photodegradation in ice was closely related to their PHE binding ability.
Agid:
6119471