| 铁锰改性不同原料生物炭对镉污染碱性农田土壤修复 |
| 摘要点击 1574 全文点击 247 投稿时间：2024-02-04 修订日期：2024-04-15 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 铁锰改性 生物炭 原料 镉污染 土壤修复 |
| 英文关键词 iron-manganese composite modification biochar biomass Cd contamination soil remediation |
|
| 中文摘要 |
| 为探讨铁锰改性不同原料生物炭（FM-BC）对Cd污染碱性农田土壤修复效应的影响,以树枝、榴莲壳和玉米秸秆为原料制备FM-BC,通过水体吸附试验和土壤培养试验研究了FM-BC性质,及其对水体Cd（Ⅱ）的吸附性能和碱性土壤有效态Cd含量（DTPA-Cd）和Cd形态分布的影响. 结果表明,铁锰改性后,生物炭的比表面积、总孔体积和氧含量得到了显著改善和提升. FM-BC对水体Cd（Ⅱ）最大吸附量为50.71~98.09 mg·g-1,较BC提高了1.61~4.27倍. 添加0.5%~3% FM-BC使土壤DTPA-Cd含量显著降低了11.77%~37.73%,碳酸盐结合态和铁锰氧化物结合态组分增加了8.61%~13.72%和6.74%~35.05%,降低了土壤中Cd的活性. 铁锰改性榴莲壳生物炭（FM-DBC）对土壤DTPA-Cd的钝化效果显著优于铁锰改性树枝生物炭（FM-RBC）和铁锰改性玉米秸秆壳生物炭（FM-YBC）. 表征结果表明,FM-DBC含有大量CO32-、C—O、Fe—O和Mn—O等吸附位点,主要通过沉淀和络合反应吸附镉,在镉污染碱性农田土壤修复方面具有较大的应用潜力. |
| 英文摘要 |
| To investigate the remediation effect of iron-manganese-modified biochar from different biomasses （FM-BC） on Cd-contaminated alkaline soil, FM-BC was prepared using branches of Robinia pseudoacacia, durian shells, and corn stalks. The characteristics of FM-BC, the adsorption of Cd（Ⅱ） in water, and the available, fraction of Cd in alkaline soil were studied using bath adsorption and soil culture experiments. The results showed that the specific surface area, total pore volume, and oxygen content of FM-BC were significantly improved. The maximum Cd（Ⅱ） adsorption capacity of FM-BC in water was 50.71-98.09 mg·g-1, which was 1.61-4.27 times higher than that of BC. After adding 0.5%-3% FM-BC, the content of DTPA-Cd was reduced by 11.77%-37.73%, and the carbonate-bound fraction and iron-manganese oxide-bound fraction of Cd were increased by 8.61%-13.72% and 6.74%-35.05%, respectively. The remediation of Cd-contaminated alkaline soil by FM-DBC was significantly better than that of FM-RBC and FM-YBC. The characterization results showed that CO32-, C—O, Fe—O, and Mn—O in FM-DBC were the main adsorption sites, which immobilized Cd through precipitation and complexation. The above results indicated that FM-DBC has application potential for Cd-contaminated alkaline soil remediation. |
|
|
|
