Sonochemical reactions of dissolved organic matter

被引:29
作者
Chen, D
He, ZQ
Weavers, LK [1 ]
Chin, YP
Walker, HW
Hatcher, PG
机构
[1] Ohio State Univ, Dept Civil & Environm Engn & Geodet Sci, Columbus, OH 43210 USA
[2] Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA
[3] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA
关键词
natural organic matter; dissolved organic matter; ultrasound; C-13-NMR; oxidation; aromaticity; Aldrich; Pahokee;
D O I
10.1163/1568567041856954
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Property changes of Aldrich and Pahokee peat dissolved organic matter (DOM) at different ultrasonic frequencies and energy densities were systematically investigated. Exposure of DOM to ultrasound resulted in decreases in TOC, Color(465), specific UV absorbance (SUVA), aromaticity and molecular weight, while DOM acidity increased. Compared to 20 kHz ultrasound, greater sonochemical transformation of DOM occurred at 354 kHz and at higher energy density, due to greater (OH)-O-. radical production. The changes to DOM properties suggest that ultrasound may significantly affect DOM-pollutant interactions (e.g. facilitate desorption of hydrophobic organics from DOM or promote complexation between metallic cations and DOM).
引用
收藏
页码:735 / 753
页数:19
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