Research progress in advanced oxidation remediation of organic contaminated soil based on activated persulfate

In recent years, advanced oxidation technology based on activated persulfate has been widely used in the remediation of organic pollution of soil and groundwater The interaction between soil minerals, organic matter and persulfate has been a hot spot of environmental chemists all over the world However, at present, the research on the interaction between soil minerals and persulfate is mainly focused on ferromanganese minerals, and less on other minerals As we all know, vanadium is a common trace element in the soil The average content of vanadium in the soil in the world can reach 150mg / kg, and the average content of vanadium in the soil in China is 82mg / kg When persulfate is used for in-situ remediation of organic contaminated soil, its interaction with vanadium will inevitably affect the remediation effect of pollutants More importantly, if vanadium can effectively activate persulfate to reduce pollution In soil remediation, vanadium can be used to activate persulfate to degrade organic pollutants Based on this, Fang Guodong, associate researcher of Nanjing Institute of soil research, Chinese Academy of Sciences, systematically carried out the work of degradation of typical persistent organic pollutant polychlorobenzene based on high-efficiency activation of vanadium oxide persulfate on the basis of studying the interaction between persulfate and magnetite It is found that vanadium oxide can effectively activate persulfate to degrade PCBs, the main intermediate products of which are 2-Chlorobenzoic acid and 2,4-D, and finally mineralized into carbon dioxide and water Electron paramagnetic resonance (EPR) technique was used to reveal the formation mechanism of sulfate radical and hydroxyl in the system as follows: firstly, V 2O 3 was transferred to the persulfate ion (s 2O 8 2 -) by single electron to generate VO 2, and then the persulfate ion was split into sulfate radical, and Vo 2 was further transferred to s 2O 8 2 - to generate sulfate radical and V (V)), which passed through s 2O The degradation of pcb28 is dominated by the reaction of sulfate radical and water to form hydroxyl Relevant results were published on applied catalyst B: environmental, 2017202, 1-11 under the title of activation of fulfill with vanadium specialties for PCBs graduation: a mechanical study.