Remediation of Cadmium Contaminated Soil by γ‑Polyglutamic Acid Modified Biochar

doi:10.15933/j.cnki.1004-3268.2024.08.008

Abstract

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.

Key words: Cadmium, Soil remediation, Modified biochar, γ?polyglutamic acid, Biological effectiveness

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。

关键词: 镉, 土壤修复, 改性生物炭, γ-聚谷氨酸, 生物有效性

CLC Number:

S156.4

LI Zhijuan, HE Wenxing, ZHANG Laixing, LIU Zheng, SUN Dan, XU Shuxia. Remediation of Cadmium Contaminated Soil by γ‑Polyglutamic Acid Modified Biochar[J]. Journal of Henan Agricultural Sciences, 2024, 53(8): 70-78.

李志娟, 贺文星, 张来星, 刘铮, 孙丹, 徐淑霞. γ-聚谷氨酸改性生物炭对镉污染土壤的修复作用[J]. 河南农业科学, 2024, 53(8): 70-78.

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