介孔二氧化硅微球固定的零价铁纳米颗粒对十溴二苯醚污染土壤的修复及植物毒性研究
Remediation and phytotoxicity of decabromodiphenyl ether contaminated soil by zero valent iron nanoparticles immobilized in mesoporous silica microspheres.
作者信息
Xie Yingying, Cheng Wen, Tsang Pokeung Eric, Fang Zhanqiang
机构信息
School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou, 510006, China.
School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou, 510006, China.
出版信息
J Environ Manage. 2016 Jan 15;166:478-83. doi: 10.1016/j.jenvman.2015.10.042. Epub 2015 Nov 10.
Polybrominated diphenyl ethers (PBDEs) are a new class of environmental pollutants which easily accumulated in the soil, especially at e-waste sites. However, knowledge about their phytotoxicity after degradation is not well understood. Nano zero valent iron (nZVI) immobilized in mesoporous silica microspheres covered with FeOOH (SiO2@FeOOH@Fe) synthesized in this study was utilized to remove decabromodiphenyl ether (BDE209) from soil. Results revealed that the removal efficiency of BDE209 can be achieved 78% within 120 h using a dosage of 0.165 g g(-1) and a pH of 5.42. Furthermore, the removal efficiency enhanced with increasing soil moisture content and the decreasing of initial BDE209 concentration. Phytotoxicity assays (biomass and germination rate, shoots and roots elongation of Chinese cabbage) were carried out to provide a preliminary risk assessment of treated soil for the application of SiO2@FeOOH@Fe.
多溴二苯醚（PBDEs）是一类新型环境污染物，容易在土壤中积累，尤其是在电子垃圾处理场。然而，关于它们降解后的植物毒性，人们了解得并不多。本研究合成的负载于覆盖有FeOOH的介孔二氧化硅微球中的纳米零价铁（nZVI）（SiO2@FeOOH@Fe）被用于去除土壤中的十溴二苯醚（BDE209）。结果表明，使用0.165 g g(-1)的剂量和5.42的pH值，在120小时内BDE209的去除效率可达78%。此外，去除效率随着土壤湿度的增加和初始BDE209浓度的降低而提高。进行了植物毒性试验（生物量和发芽率、大白菜地上部和根部伸长），以对应用SiO2@FeOOH@Fe处理后的土壤进行初步风险评估。
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