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
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.
张丽娜, 钟华, 张俊涛, 崔朋, 田亚灵, 刘智峰, 曾光明. 热,碱和Fe3O4激活过硫酸钠降解二恶烷的对比研究[J]. 中国环境科学, 2017, 37(10): 3741-3747.
ZHANG Li-na, ZHONG Hua, ZHANG Jun-tao, CUI Peng, TIAN Ya-ling, LIU Zhi-feng, ZENG Guang-ming. A comparative study on activation of persulfate by heat, base and Fe3O4 for degradation of 1,4-dioxane. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3741-3747.
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