| 巯基改性生物炭对镉污染土壤的稳定化效果 |
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| 引用本文： | 李正龙,周咏春,李海波,郭思伯,李丹阳,许云竹.巯基改性生物炭对镉污染土壤的稳定化效果[J].环境工程,2022,40(9):143. |
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| 作者姓名： | 李正龙 周咏春 李海波 郭思伯 李丹阳 许云竹 |
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| 作者单位： | 1. 东北大学 资源与土木学院, 沈阳 110819; |
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| 基金项目： | 国家重点研发计划课题(2019YFC1803804)教育部基本科研业务费重点项目(N2001012) |
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| 摘 要： | 为寻求针对东北地区镉(Cd)污染土壤的高效稳定化材料,以玉米秸秆生物炭为原始材料,以三巯丙基三甲氧基硅烷(MPS)作为改性剂制备稳定化材料巯基生物炭,分析施加不同用量(1%、3%和5%)的巯基生物炭、生物炭、石灰对土壤理化性质(pH值、CEC值、SOC值)、Cd浸出含量及Cd化学形态的影响。结果表明:各用量巯基生物炭均可使土壤pH值下降、CEC值上升、SOC值上升,TCLP法Cd浸出含量分别为76.99,72.52,67.53 mg/kg,相同用量条件下效果均优于石灰。其中,本实验最大添加量5%巯基生物炭Cd稳定化效果最为显著,较施加5%石灰的处理Cd浸出含量低11.1%。BCR连续提取法分析结果表明,5%巯基生物炭施加量使弱酸可溶态Cd、可还原态Cd分别降低了35.8%、17.63%,较5%石灰处理分别高8.18%和5.7%,效果显著。研究表明巯基生物炭较石灰针对东北地区Cd污染土壤具有更好的稳定化效果。
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| 关 键 词： | 巯基生物炭 石灰 BCR连续提取法 TCLP法 土壤修复 |
| 收稿时间： | 2021-12-11 |
STABILIZATION OF CADMIUM-CONTAMINATED SOIL BY SULFHYDRYL MODIFIED BIOCHAR |
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| Affiliation: | 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. Shenyang Ecological Environment Monitoring Center of Liaoning Province, Shenyang 110167, China |
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| Abstract: | In order to find efficient stabilization materials for cadmium contaminated soil in Northeast China, the sulfhydryl biochar was prepared with corn stalk biochar as the raw material and(3-Mercaptopropyl) trimethoxysilane(MPS) as the modifier. Furthermore, the effects of different amounts(1%, 3%, 5%) of sulfhydryl biochar, biochar and lime on soil physical and chemical properties(pH value, CEC value, SOC value), leaching content of heavy metal cadmium TCLP and chemical form of cadmium were analyzed. The results showed that the cadmium leaching content of the TCLP method was 109.82, 96.35, 86.34 mg/kg under different dosage conditions of original biochar, which was inferior to that of lime treatment under the same dosage conditions. Each amount of sulfhydryl biochar decreased soil pH value, increased CEC value, and increased SOC value. The cadmium stabilization effect of 5% thiol biochar was the most obvious, and the cadmium leaching content of the TCLP method was 67.53 mg/kg, which was 11.1% lower than that of 5% lime treatment. The results showed that the pH value of soil decreased, CEC value increased and SOC value increased with each dosage of sulfhydryl biochar. The cadmium leaching content of TCLP method was 76.99 mg/kg, 72.52 mg/kg and 67.53 mg/kg, respectively, and the effect was better than that of lime under the same dosage condition. The cadmium stabilization effect of 5% thiol biochar was the most significant, and the cadmium leaching content was 11.1% lower than that of 5% lime. The results of BCR continuous extraction showed that the amount of 5% sulfhydryl biochar reduced the soluble cadmium and reducible cadmium of weak acid by 35.8% and 17.63%, respectively, which were 8.18% and 5.7% higher than that of 5% lime treatment. The results showed that thiol biochar had a better stabilization effect than lime on cadmium-contaminated soil in northeast China. |
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