Aniline removal by Photocatalytic reaction of iron(iii) mediated with dissolved organic matter |
| |
| Authors: | Masami Fukushima Kenji Tatsumi Kengo Morimoto |
| |
| Affiliation: | 1. Hydrospheric Environmental Protection Department , National Institute for Resources and Environment (NIRE) , 16–3, Onogawa, Tsukuba, 305–8569, Japan Phone: (81)298–58–8328 Fax: (81)298–58–8328 E-mail: fukusima@nire.go.jp;2. Hydrospheric Environmental Protection Department , National Institute for Resources and Environment (NIRE) , 16–3, Onogawa, Tsukuba, 305–8569, Japan |
| |
| Abstract: | When light (> 370 nm) was allowed to interact with an aqueous solution containing dissolved organic matter (DOM) and Fe(III), removal of aniline (AN) was observed. This was due to the photocatalytic reaction of Fe(III) mediated by DOM. Syringic acid (SYA) and humic acid (HA) were used as DOM in the present study. The 15N‐NMR spectrum of the product mixture from the light irradiation of the SYA/Fe(III) system demonstrated that AN was covalently bound to SYA. The kinetics of AN removal were, therefore, interpreted by assuming covalent binding between DOM and AN. The amounts of covalent binding sites and the apparent second‐order rate constants could be evaluated, and the amounts of covalent binding sites decreased with the increases of the concentration of DOM. This is attributed that the polymerization of DOM by the photo‐oxidation competed with the covalent binding between AN and DOM. |
| |
| Keywords: | Humic acid iron aniline photocatalytic reaction covalent binding |
|
|
