施加Fe_(3)O_(4)/桑树杆生物炭对土壤砷形态和水稻砷含量的影响  

Application of Fe_(3)O_(4)/Mulberry Stem Biochar Effects on Soil Arsenic Species and Rice Arsenic Content

作　　者：阮麟乔 梁美娜[1,2,3] 丁艳梅 曹海燕 刘崇敏 成官文 朱义年[1,2,3] 王敦球 RUAN Lin-qiao;LIANG Mei-na;DING Yan-mei;CAO Hai-yan;LIU Chong-min;CHENG Guan-wen;ZHU Yi-nian;WANG Dun-qiu(School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin 541004,China;Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学环境科学与工程学院,桂林541004 [2]广西环境污染控制理论与技术重点实验室,桂林541004 [3]广西岩溶地区水污染控制与用水安全保障协同创新中心,桂林541004

出　　处：《环境科学》2023年第8期4468-4478,共11页Environmental Science

基　　金：国家自然科学基金项目(52160017);广西重点研发计划项目(桂科AB20297039);桂林理工大学科研启动金项目(GUTQDJJ2006022)。

摘　　要：以桑树杆为生物炭原料,制备Fe_(3)O_(4)/桑树杆生物炭(Fe-MBC).通过土壤培养试验,研究不同炭化温度下制备的Fe-MBC对土壤有效态As含量的钝化效果,筛选出钝化效果好的Fe-MBC-800(800℃下炭化制备)并对其进行表征.通过盆栽试验,研究Fe-MBC-800添加比例为1%~7%(质量分数)时,其对种植水稻后土壤pH值、土壤电导率(EC)、土壤As形态、水稻生物量和水稻总As含量的影响.结果表明:①Fe-MBC-800成功负载了Fe_(3)O_(4),其主要官能团有C==O双键、O—H键、C—O键和Fe—O键;Fe-MBC-800、MBC-800和Fe_(3)O_(4)的比表面积分别为209.659、517.714和68.025 m^(2)·g^(-1).②添加Fe-MBC-800可提高土壤pH值,降低土壤EC值,提高土壤残渣态As含量,降低土壤水溶态As含量和土壤有效态As含量;土壤中添加7%的Fe-MBC-800后,水溶态As含量和土壤有效态As含量分别降低了81.6%和56.33%.③土壤中Fe-MBC-800的添加比例为5%~7%时,能促进水稻植株的生长,提高水稻生物量,使水稻植株As的累积降低了62.5%~68.75%.The passivation effect of Fe_(3)O_(4)/mulberry pole biochar(Fe-MBC)prepared at different carbonization temperatures on soil available arsenic content was studied through soil culture experiments,and Fe-MBC-800(prepared by carbonization at 800℃)with good passivation effect was selected and characterized.The effects of 1%-7%(mass fraction of biochar to soil)Fe-MBC-800,MBC-800,and Fe_(3)O_(4)on soil pH value,soil electrical conductivity,soil arsenic form,rice biomass,and total arsenic(As)content in rice were studied using a pot experiment.The results showed that:①Fe-MBC-800 successfully loaded Fe_(3)O_(4),and its main functional groups were C==O double bond,O—H bond,C—O bond,and Fe—O bond.The specific surface areas of Fe-MBC-800,MBC-800,and Fe_(3)O_(4)were 209.659 m^(2)·g^(-1),517.714 m^(2)·g^(-1),and 68.025 m^(2)·g^(-1),respectively.②The addition of Fe-MBC-800 could increase the soil pH value,decrease the soil EC value,increase the content of residual arsenic in soil,and reduce the content of water-soluble arsenic and available arsenic in the soil.Under the treatment using 7%Fe-MBC-800(ω)amendments,the content of water-soluble arsenic and available arsenic in the soil decreased by 81.6%and 56.33%,respectively.③When the addition ratio of Fe-MBC-800 in the soil was 5%-7%,it could promote the growth of rice plants,increase rice biomass,and reduce the bioaccumulation of arsenic by between 62.5%and 68.75%.

关 键 词：砷(As) 污染土壤 桑树杆生物炭 磁性氧化铁 盆栽 

分 类 号：X171.5[环境科学与工程—环境科学]