Shen Lianzhou, Cai Yue, Gao Juan
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China.
University of Chinese Academy Sciences, Nanjing College, Nanjing 211135, China.
Eco Environ Health. 2025 Jan 22;4(1):100134. doi: 10.1016/j.eehl.2025.100134. eCollection 2025 Mar.
Nanoscale zero-valent iron loaded on biochar (nZVI@BC) has been proven to be effective in activating persulfate to remediate soil organic pollutants. However, studies on subsequent plant growth and microbial community changes in remediated soil remain limited. In this study, nZVI@BC, nZVI, and nanoscale biochar (nBC) were ball-mill produced and applied as amendments in pot experiments with PAH-contaminated soil to investigate their impacts on soil-crop (radish, L.) systems, and the widely distributed phenanthrene (Phe) was selected as model pollutant. The results indicate that nZVI@BC could induce more (75%) Phe accumulation in radish compared to the control treatment, but did not result in significant differences in plant biomass or enzyme activity. In Phe non-contaminated treatments, the Fe content of radish shoots increased from 86.87 ± 5.61 mg/kg DW without material application to 125.20 ± 11.93 mg/kg DW with nZVI@BC, while no significant differences were observed in roots. nZVI@BC and nBC increased the non-desorbed fraction of PAHs with low bio-availability by 13.6% and 10.2%, respectively, after 45 days compared to the control treatment. Illumina MiSeq sequencing revealed that nZVI@BC did not adversely affect the richness and diversity of soil microbial communities. Instead, it promoted the enrichment of bacteria related to the degradation of organic pollutants, such as and . The findings suggest that nZVI@BC after chemical oxidation remediation might be harmful to subsequent plants and ecosystems but much better than nZVI alone. The amount of nZVI@BC should be accurately calculated before chemical oxidation remediation.
负载在生物炭上的纳米零价铁（nZVI@BC）已被证明在活化过硫酸盐以修复土壤有机污染物方面是有效的。然而，关于修复后土壤中后续植物生长和微生物群落变化的研究仍然有限。在本研究中，通过球磨法制备了nZVI@BC、nZVI和纳米生物炭（nBC），并将其作为改良剂应用于多环芳烃污染土壤的盆栽试验中，以研究它们对土壤 - 作物（萝卜）系统的影响，并选择广泛分布的菲（Phe）作为模型污染物。结果表明，与对照处理相比，nZVI@BC可使萝卜中菲的积累量增加更多（75%），但对植物生物量或酶活性没有显著差异。在未受菲污染的处理中，萝卜地上部的铁含量从不施加物质时的86.87±5.61 mg/kg干重增加到施用nZVI@BC时的125.20±11.93 mg/kg干重，而根部未观察到显著差异。与对照处理相比，45天后nZVI@BC和nBC分别使生物有效性低的多环芳烃的非解吸部分增加了13.6%和10.2%。Illumina MiSeq测序显示，nZVI@BC不会对土壤微生物群落的丰富度和多样性产生不利影响。相反，它促进了与有机污染物降解相关的细菌的富集，如 和 。研究结果表明，化学氧化修复后的nZVI@BC可能对后续植物和生态系统有害，但比单独的nZVI要好得多。在进行化学氧化修复之前，应准确计算nZVI@BC的用量。
