纳米过氧化钙对地下水中硝基苯的类-Fenton降解效果

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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^-, SO₄^2-, 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.

Key words： nanometer calcium peroxide Fenton-like technology degradation effect influencing factors

Received: 07 March 2019

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X523

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	Articles by authors
	DONG Jia-Lin
	FU Shuang
	ZHOU Hao
	LI Tian-Yi
	QIN Chuan-Yu

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DONG Jia-Lin,FU Shuang,ZHOU Hao等. Effect of nano calcium peroxide on the fenton-like degradation of nitrobenzene in groundwater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4730-4736.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4730

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