Abstract
A widely-used herbicide, atrazine (ATZ), was investigated in heterogeneous photo-Fenton reaction using four Fe(III)-treated hydroxyapatites, HAP-100-Fe, HAP-200-Fe, HAP-300-Fe, and HAP-400-Fe, which were prepared from hydroxyapatites, HAP-100, HAP-200, HAP-300, and HAP-400, respectively (Taihei Chemical Industrial Co.), and compared with commercially available Fe(III) compounds, Fe2O3, FePO4•2H2O, and FeOOH. Among the Fe(III)-hydroxyapatites, HAP-400-Fe indicated the most efficient catalytic activity (ATZ consumption, 90%), which was almost equal to FePO4•2H2O. Although mineralization of ATZ was never detected by TOC-TN, deethylated, deisopropylated, and OH-substituted ATZs, and related oxidative degradation products were identified from LC-MS analysis of the resulting solution of ATZ photo-Fenton reaction using HAP-400-Fe.
