磁性氧化石墨烯缓解香根草镉胁迫的机理研究  

Research on the Mechanisms for GO/Fe_(3)O_(4) to Alleviate Cd Stress in Vetiveria Zizanioides L.

作　　者：李文文[1,2] 张力[1] 岳磊 李洁[1,2] 于佳明 杨世勇[1,2] LIWen-wen;ZHANG Li;YUE Lei;LI Jie;YU Jia-ming;YANG Shi-yong(School of Ecology and Environment,Anhui Normal University,Wuhu 241002,China;Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem inWanjiang Basin Co-founded by Anhui Province and Ministry of Education,Anhui Normal University,Wuhu 241007,China)

机构地区：[1]安徽师范大学生态与环境学院,安徽芜湖241002 [2]安徽师范大学皖江流域退化生态系统的恢复与重建省部共建联合实验室,安徽芜湖241002

出　　处：《安徽师范大学学报(自然科学版)》2025年第1期25-33,共9页Journal of Anhui Normal University(Natural Science)

基　　金：皖江流域退化生态系统的恢复与重建省部共建协同创新中心开放基金联合资助项目(CIWB22-010);安徽师范大学校级大学生创新创业训练计划项目(S202410370318).

摘　　要：磁性氧化石墨烯(graphene oxide/Fe_(3)O_(4),GO/Fe_(3)O_(4))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/Fe_(3)O_(4)强化植物修复的潜力和机理。结果表明,GO/Fe_(3)O_(4)显著增加了10.0 mg·kg^(^(-1)) Cd处理组的香根草根中Cd、Fe、Ca与Mg的含量,提高了0.5 mg·kg^(^(-1)) Cd处理组的香根草地上部Cd生物富集系数,增强了10.0 mg·kg^(^(-1)) Cd处理组的香根草叶绿体荧光参数和2.0 mg·kg^(^(-1)) Cd处理组的香根草叶绿素含量。同时,GO/Fe_(3)O_(4)显著降低了2.0 mg·kg^(^(-1)) Cd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^(^(-1)) Cd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/Fe_(3)O_(4)强化重金属污染土壤的植物修复提供了科学依据。Magnetic graphene oxide(graphene oxide/Fe_(3)O_(4),GO/Fe_(3)O_(4))is a nano-hybrid material characterized by fast electron transfer and Fe source provision that has a prospective application in the enhancement of heavy metal-contaminated 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/Fe_(3)O_(4) by measuring 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/Fe_(3)O_(4) significantly increased the contents of Cd,Fe,Ca,and Mg in the roots of vetiver exposed to 10 mg·kg^(-1) Cd,increased Cd bio-enrichment coefficients in the shoots of vetiver exposed to 0.5 mg·kg^(-1) Cd,and enhanced the chlorophyll fluorescence parameters of vetiver exposed to 10 mg·kg^(-1) Cd,and chlorophyll content of vetiver to 2.0 mg·kg^(-1) Cd.Meanwhile,GO/Fe_(3)O_(4) significantly decreased the contents of MDA in shoots and H2O2 in roots of vetiver exposed to 2 mg·kg^(-1) Cd,significantly increased POD activity in roots,as well as POD activity and CAT activity in shoots of vetiver exposed to 2 mg·kg^(-1) Cd and 0.5 mg·kg^(-1) Cd.The experimental results provide a scientific evidence for the application of GO/Fe_(3)O_(4) in the phytoremediation enhancement of heavy metal-contaminated soil.

关 键 词：磁性氧化石墨烯 镉 香根草 积累 土壤 

分 类 号：X53[环境科学与工程—环境工程]