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| A comparative study on activation of persulfate by heat, base and Fe3O4 for degradation of 1,4-dioxane |
| ZHANG Li-na1, ZHONG Hua1,2, ZHANG Jun-tao1, CUI Peng1, TIAN Ya-ling1, LIU Zhi-feng1, ZENG Guang-ming1 |
1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China;
2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China |
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Abstract In this study activation of persulfate by heat, base, and magnetic oxide (Fe3O4) for degradation of 1.4-dioxane was investigated and compared. The results showed that degradation of 1,4-dioxane was inhibited in the base-activation system with pH low than 12. Heat was effective for persulfate activation to degrade 1,4-dioxane. When the temperature was 40℃ and the molar ratio of persulfate and 1,4-dioxane was 20:1, the percentage of 1,4-dioxane removal reached 98% in 48h and the pseudo-first-order reaction rate constant was 68.1×10-6h-1. Degradation of 1,4-dioxane was also significant in the heterogeneous system with Fe3O4 as the activator. When the molar ratio of persulfate and 1,4-dioxane was 80:1 and the solid-liquid ratio between Fe3O4 and solution was 1:100, the pseudo-first-order reaction rate constant for 1,4-dioxane removal was 61.1×10-6h-1, which was close to that obtained with heating (40℃) as the activation method. In this Fe3O4-based heterogeneous activation system, production of soluble Fe and consumption of Fe3O4 were minimal before depletion of 1,4-dioxane, which is due to preference of the reaction between persulfate and 1.4-dioxane to the reaction between persulfate and Fe3O4. The results of this study indicated the potential of application of the Fe3O4-based method for persulfate activation for remediation of groundwater contaminated by organic compounds.
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Received: 04 February 2017
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