Nanoscale zerovalent iron-mediated degradation of DDT in soil.
Nanoscale zerovalent iron-mediated degradation of DDT in soil.
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纳米级零价铁介导的土壤中 DDT 降解。
DOI：
10.1007/s11356-015-5850-3
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Yu Yunlong
中科院分区：
文献类型：
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作者：
Han Yuling;Shi Nan;Wang Huifang;Pan Xiong;Fang Hua;Yu Yunlong
研究了纳米零价铁（nZVI）在不同铁源、铁投加量、土壤水分、温度和土壤类型等条件下对DDT污染土壤的降解作用。nZVI和油酸钠包覆nZVI（SO-nZVI）对p，p′-DDT的降解效率明显高于聚酰亚胺包覆nZVI（PI-nZVI）。nZVI对p，p′-DDT的快速降解仅发生在淹水土壤中。当nZVI投加量为0.5%~ 2.0%时，p，p′-DDT的降解半衰期从58.3 h显著降低到27.6 h;当温度为15 ~ 35 °C时，p，p′-DDT的降解半衰期从46.5 h显著降低到32.0 h。nZVI在金华、嘉兴、萧山、华家池和黑龙江土壤中对p，p′-DDT的降解效果不同。p，p′-DDT的降解半衰期与土壤的多种性质有很好的相关性。通过GC-MS分析，推测nZVI对土壤中p，p′-DDT的降解途径为DDT → DDD/DDE → DDNS → DDOH。因此，nZVI是一种有效的厌氧环境下修复DDT污染土壤的药剂。
Nanoscale zerovalent iron (nZVI)-mediated degradation of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) was investigated in a spiked soil under different conditions (iron sources, iron dosage, soil moisture, temperature, and soil types) and DDT-contaminated field. The degradation efficiency ofp,p′-DDT by nZVI and nZVI coated with sodium oleate (SO-nZVI) was much higher than that by nZVI coated with polyimide (PI-nZVI). The rapid degradation ofp,p′-DDT by nZVI only occurred in flooded soil. The degradation half-life ofp,p′-DDT decreased significantly from 58.3 to 27.6 h with nZVI dosage from 0.5 to 2.0 % and from 46.5 to 32.0 h with temperature from 15 to 35 °C. The degradation efficiency ofp,p′-DDT by nZVI differed in Jinhua (JH), Jiaxing (JX), Xiaoshan (XS), Huajiachi (HJC), and Heilongjiang (HLJ) soils. A good correlation was found between the degradation half-life ofp,p′-DDT and multiple soil properties. The probable nZVI-mediated degradation pathway ofp,p′-DDT in soil was proposed as DDT → DDD/DDE → DDNS → DDOH based on the metabolites identified by GC-MS. The in situ degradation efficiency of residual DDTs in a contaminated field was profoundly enhanced by the addition of nZVI as compared to the control. It is concluded that nZVI might be an efficient agent for the remediation of DDT-contaminated soil under anaerobic environment.