Remediation of Petroleum-Contaminated Soil by Magnetic Multi-Walled Carbon Nanotubes-Microorganisms
The magnetic multi-wall carbon nano tube prepared by mixing the multi-wall carbon nano tube with the magnetic medium not only enhances the adsorptivity,but also facilitates the rapid separation from the environment.In order to enhance the effect of remediation of petroleum-contaminated soil and make up for the shortage of single remediation,LD23 and NYJ3.6,two petroleum-degrading bacteria,and magnetic multi-walled carbon nanotubes were selected for joint remediation.First,the surface characteristics of the magnetic multi-wall carbon nanotubes and the multi-wall carbon nanotubes prepared by different methods were analyzed and compared by using SEM,FTIR,Zeta and XPS,and then experimental groups with different restoration combinations were respectively set and added to the petroleum contaminated soil,and finally the water content of the soil,the changes of ammonium nitrogen and available phosphorus and the petroleum degradation rates of different combinations were measured,and the combination mode with obvious restoration effects was obtained according to the above indexes.The results showed that the aggregation of MWNTs in water could be changed by adding magnetic iron oxide medium,and the stability of MWNTs was enhanced by the increase of the oxidizing group.The water content,ammonium nitrogen and available phosphorus decreased after the soil was polluted by oil.After the oil-contaminated soil was repaired by four different treatment methods,the water content,ammonium nitrogen and available phosphorus contents of the soil were significantly increased.The two methods of LD23 and Fe3O4/carbon nanotubes(CF),NYJ3.6 and Fe3O4/carbon nanotubes(CF),which were the combination of microbial and physical remediation,had the most significant effect on the remediation of petroleum pollution.
magnetic multiwalled carbon nanotubesmicrobesrepairoil pollutionsoil
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