Surface chemical behavior of 2,4-dichlorophenol in presence of metal oxides

Abstract

Abstract: To understand the surface chemistry of phenolic pollutants in the presence of metal oxides,this paper studied the reactions of 2,4-dichlorophenol with metal oxides in a kinetic and batch experiment.The results showed that amorphous ferric oxyhydroxide,goethite,δ-MnO₂ and α-MnO₂ were the potential oxidizing agents of natural and xenobiotic organic compounds.The oxidation rate of 2,4-DCP on the surface of these metal oxides was in order of δ-MnO₂ α-MnO₂ > iron oxides.It was observed from the pseudo-first-order kinetics that the reaction rates of manganese oxides were 3～50 times higher than those of iron oxides,and δ-MnO₂ had a1. 5～3.2 times higher reaction rate than α-MnO₂.Root exudates had a significant effect on the oxidation ability of metal oxides through changing the surface characteristics or involving in the reaction process.Upon the addition of ryegrass root exudates,the oxidation of 2,4-DCP was decreased in the suspension of α-MnO₂ while increased in that of δ-MnO₂.The coexistence of Cu probably influenced the oxidation process of 2,4-DCP on the surface of metal oxides.A greater negative effect of Cu on the oxidation of 2,4-DCP was also observed in the suspension of δ-MnO₂ due to its strong adsorption toward Cu,as compared with that of α-MnO₂.

Key words: Metal oxide, Root exudates, Organic pollutant, Surface chemistry

CLC Number:

X171

LIN Qi, WU Jianyang, CHEN Yingxu, JIN Haifeng . Surface chemical behavior of 2,4-dichlorophenol in presence of metal oxides[J]. Chinese Journal of Applied Ecology, 2005, 16(4): 688-692.

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