Effect of nano calcium peroxide on the fenton-like degradation of nitrobenzene in groundwater
DONG Jia-Lin1,2, FU Shuang3, ZHOU Hao1,2, LI Tian-Yi1,2, QIN Chuan-Yu1,2
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; 2. College of Environment and Resources, Jilin University, Changchun 130021, China; 3. College of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China
Abstract:To investigate the feasibility of using the modified fenton (MF) with nanometer calcium peroxide (nano-CaO2) for the remediation of contaminated groundwater, this study firstly improved the method for preparation of the nano-CaO2, and achieved the effective content of 88.35%. Then, through the evaluation of changes in pH, DO and nitrobenzene concentrations in a static test, the nano-CaO2 based nitrobenzene degradation process and the influencing factors were investigated, and the kinetics and the best reaction conditions of the nitrobenzene degradation were also clarified. In addition, the validity of different free radicals was studied by the masking experiments. Finally, by performing the dynamic simulation in a one-dimensional simulation column, the mechanism and efficacy of the nano-CaO2 based nitrobenzene removal were also accessed. The results showed that the degradation efficacy was best, when the concentration ratio of CaO2, EDTA-Fe2+ and the nitrobenzene was 48:8:1, and the degradation curve fitted to the first-order kinetic curve. It was also demonstrated that the main degradation radical in the reaction process was ·OH, and the degradation efficiency was affected by HCO3-, SO42-, Ca2+ and Mg2+ plasma. According to the simulation test in the one-dimensional simulation column, it was revealed that with existing proper amount of iron, nano-CaO2 could be a sustained release agent of hydrogen peroxide, and correspondingly, free radical induced degradation would be enabled through Fenton-like catalytic reaction, which indicated nano-CaO2 would have a good application prospect in site remediation.
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DONG Jia-Lin, FU Shuang, ZHOU Hao, LI Tian-Yi, QIN Chuan-Yu. Effect of nano calcium peroxide on the fenton-like degradation of nitrobenzene in groundwater. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4730-4736.
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