Preliminary study on the photoproduction of hydroxyl radicals in aqueous solution with Aldrich humic acid, algae and Fe(III) under high-pressure mercury lamp irradiation
Data(s) |
2004
|
---|---|
Resumo |
Under a high-pressure mercury lamp (HPML) and using an exposure time of 4 h, the photoproduction of hydroxyl radicals ((OH)-O-.) could be induced in an aqueous solution containing humic acid (HA). Hydroxyl radicals were determined by high-performance liquid chromatography using benzene as a probe. The results showed that (OH)-O-. photoproduction increased from 1.80 to 2.74 muM by increasing the HA concentration from 10 to 40 mg L-1 at an exposure time of 4 h (pH 6.5). Hydroxyl radical photoproduction in aqueous solutions of HA containing algae was greater than that in the aqueous solutions of HA without algae. The photoproduction of (OH)-O-. in the HA solution with Fe(111) was greater than that of the solution without Fe(III) at pH ranging from 4.0 to 8.0. The photoproduction of (OH)-O-. in HA solution with algae with or without Fe(111) under a 250 W HPML was greater than that under a 125 W HPML. The photoproduction of (OH)-O-. in irradiated samples was influenced by the pH. The results showed that HPML exposure for 4 h in the 4-8 pH range led to the highest (OH)-O-. photoproduction at pH 4.0. |
Identificador | |
Fonte |
Xianli Liu; Dong Xu; Feng Wu; Zhenhuan Liao; Jiantong Liu and Nansheng Deng.Preliminary study on the photoproduction of hydroxyl radicals in aqueous solution with Aldrich humic acid, algae and Fe(III) under high-pressure mercury lamp irradiation,PHOTOCHEMISTRY AND PHOTOBIOLOGY,2004,79(3):259-264 |
Palavras-Chave | #Biochemistry & Molecular Biology; Biophysics #PHOTO-FENTON REACTION #PHOTOCHEMICAL FORMATION #NATURAL-WATERS #RATE CONSTANTS #FE(III)-HYDROXY COMPLEX #HYDRATED ELECTRONS #HYDROGEN-PEROXIDE #SINGLET OXYGEN #ORGANIC-MATTER #SURFACE WATERS |
Tipo |
期刊论文 |