【摘要】 磁性氧化石墨烯（graphene oxide/Fe₃O₄,GO/Fe₃O₄）是一种具有快速电子传递和提供Fe源的纳米杂合材料，在强化重金属污染土壤的植物修复方面具有广阔的应用前景。本研究以香根草为实验材料，采用室内盆栽的方法，从Cd的植物积累、矿质元素吸收、光合作用荧光指标、抗氧化酶活力以及膜脂过氧化程度等方面，系统评价了GO/Fe₃O₄强化植物修复的潜力和机理。结果表明，GO/Fe₃O₄显著增加了10.0 mg·kg^-1Cd处理组的香根草根中Cd、Fe、Ca与Mg的含量，提高了0.5 mg·kg^-1Cd处理组的香根草地上部Cd生物富集系数，增强了10.0 mg·kg^-1Cd处理组的香根草叶绿体荧光参数和2.0 mg·kg^-1Cd处理组的香根草叶绿素含量。同时，GO/Fe₃O₄显著降低了2.0 mg·kg^-1Cd处理组的香根草地上部丙二醇（MDA）和根中的过氧化氢（H₂O₂）含量、显著提高了香根草根中的过氧化物酶（POD）活性，以及0.5 mg·kg^-1Cd处理组的香根草地上部POD活性和过氧化氢酶（CAT）活性。实验结果为应用GO/Fe₃O₄强化重金属污染土壤的植物修复提供了科学依据。更多还原

【Abstract】 Magnetic graphene oxide （graphene oxide/Fe₃O₄,GO/Fe₃O₄） is a nano-hybrid material characterized by fast electron transfer and Fe source provision that has a prospective application in the enhancement of heavy metalcontaminated soil phytoremediation.The study,using vetiver as the experimental material and indoor pot method,comprehensively evaluated the potential and mechanism of phytoremediation enhancement of GO/Fe₃O₄by mea‐suring Cd accumulation,mineral adsorption,chlorophyll fluorescence parameters,antioxidant enzyme activities,and degree of lipid membrane peroxidation in vetiver subjected to Cd exposure.The results showed that GO/Fe₃O₄significantly increased the contents of Cd,Fe,Ca,and Mg in the roots of vetiver exposed to 10 mg·kg^-1Cd,in‐creased Cd bio-enrichment coefficients in the shoots of vetiver exposed to 0.5 mg·kg^-1Cd,and enhanced the chlo‐rophyll fluorescence parameters of vetiver exposed to 10 mg·kg^-1Cd,and chlorophyll content of vetiver to 2.0 mg·kg^-1Cd.Meanwhile,GO/Fe₃O₄significantly decreased the contents of MDA in shoots and H₂O₂in roots of vetiver exposed to 2 mg·kg^-1Cd,significantly increased POD activity in roots,as well as POD activity and CAT activity in shoots of vetiver exposed to 2 mg·kg^-1Cd and 0.5 mg·kg^-1Cd.The experimental results provide a scientific evi‐dence for the application of GO/Fe₃O₄in the phytoremediation enhancement of heavy metal-contaminated soil.更多还原