1. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
3. Green Building Center, East China Architectural Design and Research Institute co. LTD, Shanghai 200002, China
Zero-valent iron (Fe0) activated persulfate (PS) advance oxidation process was applied to degrade organic Eriochrome black T (EBT) dye in water. The effects of different system (PS oxidation alone, Fe0 and Fe0/PS, PS/Fe0 molar ratio, inorganic ions(NO3-, CO32-, Cl-), initial solution pH value, temperature and natural organic matter on the EBT degradation was investigated. The experiment result indicated EBT degradation followed well with the pseudo-first-order kinetic model (R2>0.87). Compared with the Fe0 and PS oxidation alone, EBT can be removed efficiently by Fe0/PS system, the removal percentage of EBT can be reached to 96. 21%. The optimum molar ratio of PS/Fe0 for EBT degradation was 1:1.5. Inorganic ions (NO3-, CO32-) and natural organic matter had negative influence on degradation of EBT to a certain extent. The degradation rate of EBT decreased with the increase of initial solution pH. With the increase of temperature from 303K to 318K, the degradation rate increased at the beginning and then decreased slowly, meanwhile the reaction activation energy (Ea) was 43. 98kJ/mol. The removal efficiencies of EBT in real water still kept a high level. Based on the analysis result of GC-MS, ten intermediates were identified and the degradation pathway was proposed. The evaluation results of ECOSAR model showed that the ecotoxicity of small molecular organic matter from EBT degradation products was higher than that of macromolecular organic matter.
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