School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China.
State Key Laboratory of Microbial Technology, Shandong University, Bin Hai Road 72, Qingdao 266237, China.
Int J Environ Res Public Health. 2018 Oct 23;15(11):2334. doi: 10.3390/ijerph15112334.
Soil contaminated with Cd and Pb has caused sharp decrease of cultivatable soil and has been attracting increasing attention. Biosurfactants are efficient in solving the problem. However, little information is available about the influence of sophorolipids (SLs) on the remediation of Cd- or Pb-contaminated soil. The sophorolipids produced by CGMCC 1576 were used to study the effects of Cd and Pb removal in batch soil washing from artificially contaminated soil. The removal efficiency of crude total SLs was better than both distilled water and synthetic surfactants. Furthermore, 83.6% of Cd and 44.8% of Pb were removed by 8% crude acidic SLs. Acidic SLs with high water solubility were more effective than lactonic SLs in enhancing remediation of heavy metal-contaminated soils. The complexation of Cd with the free carboxyl group of the acidic SLs was observed by Fourier-transform infrared spectroscopy study, and this complexation was effective in heavy metal removal from the soil. The fermentation broth of , without further preparation, removed 95% of Cd and 52% of Pb. These results suggested that SLs produced by could function as potential bioremediation agents for heavy metal-contaminated soil.
被 Cd 和 Pb 污染的土壤导致可耕种土壤急剧减少，引起了越来越多的关注。生物表面活性剂在解决这一问题方面非常有效。然而，关于槐糖脂（SLs）对 Cd 或 Pb 污染土壤修复的影响的信息很少。使用 CGMCC 1576 产生的槐糖脂来研究批量土壤洗涤中从人工污染土壤中去除 Cd 和 Pb 的效果。粗总 SLs 的去除效率优于蒸馏水和合成表面活性剂。此外，8%的粗酸性 SLs 可去除 83.6%的 Cd 和 44.8%的 Pb。高水溶性酸性 SLs 比内酯型 SLs 更有效地增强对重金属污染土壤的修复。傅里叶变换红外光谱研究观察到 Cd 与酸性 SLs 中的游离羧基的络合，这种络合有效地从土壤中去除重金属。无需进一步制备，发酵液即可去除 95%的 Cd 和 52%的 Pb。这些结果表明， 产生的 SLs 可以作为重金属污染土壤的潜在生物修复剂。
