铁锰改性不同原料生物炭对镉污染碱性农田土壤修复  

Remediation Effect of Iron-manganese Composite-modified Biochar from Different Biomasses on Cd-contaminated Alkaline Soil

作　　者：杨婷婷 江胜国 梁凯 杨宗政 徐应明 YANG Ting-ting;JIANG Sheng-guo;LIANG Kai;YANG Zong-zheng;XU Ying-ming(Tianjin Geology Research and Marine Geological Center,Tianjin 300170,China;Shandong Sinan Testing Technology Co.,Ltd.,Jinan 250001,China;College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China;Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China)

机构地区：[1]天津市地质研究和海洋地质中心,天津300170 [2]山东司南检测技术有限公司,济南250001 [3]天津科技大学化工与材料学院,天津300457 [4]农业农村部环境保护科研监测所,天津300191

出　　处：《环境科学》2025年第1期461-469,共9页Environmental Science

基　　金：国家自然科学基金项目(42377038);国家现代农业产业技术体系项目(CARS-03-25)。

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. FMBC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CO_(3)^(2-)、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.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 CO_(3)^(2−),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.

关 键 词：铁锰改性 生物炭 原料 镉污染 土壤修复 

分 类 号：X171.5[环境科学与工程—环境科学]