γ-聚谷氨酸改性生物炭对镉污染土壤的修复作用
Remediation of Cadmium Contaminated Soil by γ-Polyglutamic Acid Modified Biochar
李志娟 1贺文星 2张来星 2刘铮 1孙丹 1徐淑霞2
作者信息
- 1. 河南省地质研究院,河南 郑州 450001
- 2. 河南农业大学 生命科学学院,河南 郑州 450046
- 折叠
摘要
为了强化生物炭对镉污染土壤的修复作用,采用γ-聚谷氨酸对玉米秸秆生物炭进行活化改性,采用扫描电镜和红外光谱对γ-聚谷氨酸改性生物炭的结构进行表征,通过模拟土壤镉污染试验,探究γ-聚谷氨酸改性生物炭对Cd2+的钝化效果.结果表明,γ-聚谷氨酸改性生物炭的羟基和羧基官能团数量显著增加.与施加1.0%原始生物炭处理相比,在镉污染土壤中施加等量的γ-聚谷氨酸改性生物炭处理,其土壤的阳离子交换量、有机质含量及土壤磷酸酶、过氧化氢酶和脲酶的活性均显著提高,分别提高9%、17%、18%、15%、20%;土壤中残渣态Cd的含量增加15%,弱酸可提取态Cd的含量降低27%,土壤中Cd2+的生物有效性明显降低;种植的小白菜根和叶中Cd2+含量显著降低.综上,γ-聚谷氨酸改性可以提高生物炭钝化土壤中镉的能力,γ-聚谷氨酸改性生物炭在镉污染土壤修复中极具潜力.
Abstract
In order to strengthen the remediation effect of biochar on cadmium-contaminated soil,γ-polyglutamic acid was used to activate and modify corn straw biochar.The structure of γ-polyglutamic acid modified biochar was characterized by scanning electron microscopy and infrared spectroscopy.The passivation effect of γ-polyglutamic acid modified biochar on Cd2+was investigated by simulating soil cadmium pollution test.The results showed that the number of hydroxyl and carboxyl functional groups of γ-polyglutamic acid modified biochar increased significantly.Compared with the application of 1.0% original biochar,applying equal amount of γ-polyglutamic acid modified biochar in cadmium-contaminated soil significantly increased the soil cation exchange capacity,organic matter content,soil phosphatase,catalase and urease activities by 9%,17%,18%,15%and 20%,respectively.The content of residual Cd in soil increased by 15%,the content of weak acid extractable Cd decreased by 27%,and the bioavailability of Cd2+in soil decreased significantly.The content of Cd2+in roots and leaves of Chinese cabbage decreased significantly.In summary,γ-polyglutamic acid modification can improve the ability of biochar to passivate cadmium in soil,and γ-polyglutamic acid modified biochar has great potential in the remediation of cadmium contaminated soil.
关键词
镉/土壤修复/改性生物炭/γ-聚谷氨酸/生物有效性Key words
Cadmium/Soil remediation/Modified biochar/γ-polyglutamic acid/Biological effectiveness引用本文复制引用
基金项目
河南省重点研发专项(221111112300)
河南省科技攻关计划(222102110120)
河南省地质研究院地质科技攻关计划(2023)(2023-906-XM014-KT01)
出版年
2024
国家科技期刊平台
NSTL
万方数据