【摘要】 生物炭载纳米零价铁（MBC@nZVI）活化过硫酸钠（PS）是土壤污染修复技术的研究热点，重点对MBC@nZVI活化PS降解土壤中的萘和MBC@nZVI、PS的扩散进行研究。采用批实验考察了MBC@nZVI+PS质量分数、水土比、有机质含量及苯对萘降解的影响；采用砂箱实验研究了MBC@nZVI、PS在土壤中的扩散及萘的降解。结果表明，水土比为0.50 mL∶1.00 g时，MBC@nZVI+PS的质量分数增加到2.0%,萘的降解率可提高到87.7%;有机质质量分数为1.0%时萘降解速率最快；苯浓度越高对萘的降解抑制程度越明显。MBC@nZVI活化PS体系能有效修复注射管周围半径5 cm,深度6 cm区域内的萘污染土壤；MBC@nZVI和Fe²⁺的迁移受限是萘降解的主要限制因素。研究结果可为MBC@nZVI活化PS技术在有机污染土壤修复中的工程应用提供参考。更多还原

【Abstract】 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.更多还原