Degradation of naphthalene in soil by persulfate activated by biochar-loaded nanoscale zero-valent iron
The chemical oxidation of sodium persulfate(PS)activated by biochar-loaded nanoscale zero-valent iron(MBC@nZVI)is the forefront of research in soil pollution remediation technology.In this study,the degradation of naphthalene in soil by MBC@nZVI activated PS was investigated,along with the diffusion of MBC@nZVI and PS within the soil matrix.Firstly,batch experiments were conducted to study the influence of MBC@nZVI+PS mass fraction,water-soil ratio,organic matter content,and the presence of benzene on naphthalene degradation.On this basis,sandbox experiments were undertaken to assess the diffusion of MBC@nZVI and PS in soil,along with naphthalene degradation.The results indicated that increasing the mass fraction of MBC@nZVI+PS to 2.0％significantly enhanced the naphthalene degradation rate to 87.7％,when the water-soil ratio was 0.50 mL:1.00 g.Maximal naphthalene degradation efficiency observed at an organic matter content of 1.0％.Conversely,naphthalene degradation was impeded by increasing benzene concentrations.The MBC@nZVI activated PS system effectively remediated naphthalene-contaminated soil in the vicinity of the injection tube,specifically within a 5 cm radius and a depth of 6 cm.The migration limitation of MBC@nZVI and Fe2+was the main factor restricting the degradation of naphthalene.The research findings could provide valuable references for the engineering application of MBC@nZVI activated PS technology in the remediation of organic-contaminated soil.
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维普
