EDDS强化Fe<sup>0</sup>-Al<sup>0</sup>体系降解废水中4-氯酚的性能和机理

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Abstract The green advanced oxidation process of Fe⁰-Al⁰/O₂ enhanced by ethylenediamine disuccinic acid (EDDS) was applied to generating reactive oxygen species (ROS) of H₂O₂ and ·OH by the O₂ spontaneous reduction at normal temperature and pressure. The simulated 4-CP wastewater was degraded in this study. The effects of the initial pH, the mass ratio of Fe⁰ to Al⁰, the EDDS dosage and initial 4-CP concentration were investigated in the process. The insitu -generation of H₂O₂ and ·OH as well as the oxidative mechanism of 4-CP degradation were proved by electron spin resonance (ESR), benzoic capturing, oxygen stripping and 4-CP degradation products. The results show that 4-CP degradation efficiency in the Fe⁰-Al⁰/O₂ system enhanced by EDDS decreases with the initial pH increasing and remains pleasurable in the pH range of 2.5~9. With the mass ratio of Fe⁰ and Al⁰ increasing, the removal rate of 4-CP increases first and then decreases, and the best mass ratio of Fe⁰ to Al⁰ was 4:1. The removal rate of 4-CP increases with EDDS dosage and the initial 4-CP concentration. EDDS was found to have improved 4-CP removal rate by 9times. The complete 4-CP removal and dechlorination were achieved within 3h at nitial pH of 2.5, EDDS dosage of 1.5mmol/L, Fe⁰:Al⁰ (w:w) of 4:1and initial 4-CP concentration of 4-CP of 100mg/L.

Key words： Fe⁰-Al⁰/O₂ system Reactive oxygen species (ROS) EDDS Fenton Degradation mechanisms

Received: 09 October 2017

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	LIU Xia
	FAN jin-hong

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LIU Xia,FAN jin-hong. Enhanced bimetallic Fe⁰-Al⁰/O₂ system by EDDS for degradation of aqueous 4-CP[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1704-1711.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1704

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