Effects of mixed surfactants on the bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) in crops and the bioremediation of contaminated farmlands.
Effects of mixed surfactants on the bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) in crops and the bioremediation of contaminated farmlands.
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DOI：
10.1016/j.scitotenv.2018.07.349
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Zhiheng Li;Wen Wang;Lizhong Zhu
中科院分区：
文献类型：
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作者：
Zhiheng Li;Wen Wang;Lizhong Zhu
鉴于农田土壤中多环芳烃（PAHs）污染的普遍性，有必要开发一种既能保证农业生产安全又能修复受污染土壤的技术。本研究利用一系列混合表面活性剂降低农作期作物对多环芳烃的吸收，提高休闲期植物-微生物联合生物降解能力。在耕作期间，十六烷基三甲基溴化铵（CTMAB）和吐温80的混合物分别通过阳离子交换和氢键作用附着在土壤上，增加土壤有机质，分配多环芳烃的生物有效性组分。对菲和芘的最大去除率分别为88.6%和94.9%，萝卜属（Raphanus sativusL.）分别休闲期，十二烷基苯磺酸钠（SDBS）减少了吐温80在土壤上的吸附损失，促进了多环芳烃的解吸。SDBS和吐温80的混合物增加了土壤中多环芳烃的水溶性部分，改变了细菌的群落结构，丰富了细胞运动和信号转导的功能基因。土壤中菲和芘的去除率高达86.7%和90.7%。该系统技术为多环芳烃污染农田的修复和种植提供了有效的解决方案。
Given the widespread contamination of polycyclic aromatic hydrocarbons (PAHs) in farmland, it is necessary to develop a technology to ensure the safety of agricultural productions and remediate the contaminated soils. In this study, a series of mixed surfactants were utilized to reduce the uptake of PAHs by crops in farming period and enhance the plant-microbe associated biodegradation in fallow period. During the farming period, the mixtures of cetyltrimethyl ammonium bromide (CTMAB) and Tween 80 were attached on soil by cationic-exchange and hydrogen bond, respectively, which increased soil organic matter to partition the bio-available fraction of PAHs. The maximum reduction of phenanthrene and pyrene was 88.6% and 94.9% for chrysanthemum (Chrysanthemum coronariumL.), and 90.6% and 91.9% for raphanus (Raphanus sativusL.), respectively. During the fallow period, sodium dodecyl benzene sulfonate (SDBS) reduced the adsorption loss of Tween 80 on soil to enhance desorption of PAHs. The mixtures of SDBS and Tween 80 increased the water-soluble fraction of PAHs in soils, modified bacterial community structure, and enriched the functional genes involved cell motility and signal transduction. Removal efficiencies of phenanthrene and pyrene in soils were high to 86.7% and 90.7%. This systematic technology provided an effective solution to remediate and plant on PAH-contaminated farmlands.