摘要
为探究市售植物秸秆生物炭对土壤中Cd的固化效果及机理,采用室内培养35 d的方法,以炭土质量比1∶50将其施加于模拟Cd超标土壤。结果表明,添加生物炭能显著增加供试原土壤的pH、电导率、总有机碳含量和阳离子交换量。施加生物炭后,土壤Cd总量和有效态含量均有所降低,其中Cd总量降低了63.64%,修复后的Cd浓度未超出《土壤环境质量农用地土壤污染风险管控标准》(GB 15618—2018)中5.5<pH≤6.5条件下农田土壤镉风险筛选值;同时可交换态等Cd形态含量有所下降,而残渣态Cd含量显著增加。结合FTIR、XRD等表征分析,推测生物炭对土壤Cd的直接固化机理为官能团络合、离子交换和阳离子-π作用,间接固化机理是通过改善土壤理化性质来影响Cd的赋存形态而实现固定。
In order to investigate the curing effect and mechanism of commercially available plant straw biochar on Cd in vegetable greenhouse soil,it was applied to simulated Cd-exceeding soil at a charcoal-soil mass ratio of 1∶50 using indoor incubation for 35 d.The results showed that the addition of biochar significantly increased the pH,electrical conductivity total organic carbon content and cation exchange of the original soil of the testing.After the application of biochar,the total soil Cd and effective state contents were reduced,in which the total Cd was reduced by 63.64%,and the Cd concentration after remediation did not exceed the Cd risk screening value of farmland soil under the condition of 5.5<pH≤6.5 in the Soil Pollution Risk Control Standard for Soil Environmental Quality of Agricultural Land(GB 1561—2018);at the same time,the content of Cd forms,such as the exchangeable state,was reduced,while the content of Cd in residual state increased significantly.Combined with FTIR,XRD and other characterization analyses,it was speculated that the direct curing mechanism of biochar on soil Cd was functional group complexation,ion exchange and cation-πinteraction,and the indirect curing mechanism was to improve the soil physicochemical properties to affect the Cd storage form and achieve the immobilization.
作者
熊健
古增瑞
张越
格旦
陈孟焱
谢鹏程
李伟
XIONG Jian;GU Zengrui;ZHANG Yue;GE Dan;CHEN Mengyan;XIE Pengcheng;LI Wei(School of Ecology and Environment,Xizang University,Lhasa 850000,China;Xizang Zepang Environmental Engineering Consulting Co.,Ltd.,Shigatse 857000,China)
出处
《应用化工》
北大核心
2025年第8期2031-2036,2042,共7页
Applied Chemical Industry
基金
西藏大学2023年国家级大学生创新训练项目(202310694016)
中央财政支持地方高校发展专项资金项目(2023年1号,2024年1号)
2022年西藏自治区科技计划项目(XZ202202YD0027C)
西藏大学人才发展激励计划——青年学者资助项目。
