海泡石负载型纳米零价铁去除水和土壤中的多溴联苯醚

发布时间：2018-02-16 22:05

本文关键词： 海泡石负载型纳米零价铁多溴联苯醚十溴联苯醚去除土壤修复　出处：《上海应用技术学院》2015年硕士论文　论文类型：学位论文

【摘要】：多溴联苯醚(PBDEs)由于其难降解、生物蓄积性,传输距离远,修复PBDEs污染已成为环境保护领域的一个研究热点。本研究选择十溴联苯醚(BDE-209)为代表性的PBDEs,研究海泡石负载型纳米零价铁去除水体和土壤中多溴联苯醚的可行性。本课题以盐酸改性后的海泡石为载体,成功制备了海泡石负载型纳米零价铁。水相中BDE-209的去除实验结果表明,海泡石负载纳米零价铁对水中BDE-209具有良好的去除效果,反应进行24h后的BDE-209去除率几乎达到100%。十溴联苯醚的去除是降解和吸附共同作用的。提高负载型纳米零价铁的投加量、降低BDE-209的初始浓度以及减小溶液的初始pH可以提高BDE-209的去除效率。BDE-209的降解过程是一个逐步脱溴的过程,海泡石负载型nZVI对水相中BDE-209的去除过程符合准一级动力学方程。土壤中BDE-209的去除实验结果表明,海泡石负载型纳米零价铁对土壤中的BDE-209具有极好的去除效果,在反应进行16d后,海泡石负载型nZVI对土壤中BDE-209的去除率为29.44%。提高海泡石负载型纳米零价铁的投加量、适量降低土壤溶液的初始pH可以提高BDE-209的去除效率。土壤有机质会降低BDE-209由土壤相迁移到海泡石相的速率,导致海泡石负载型nZVI对土壤中BDE-209的去除效率降低。
[Abstract]:Polybrominated diphenyl ether (PBDEs) because of its difficult degradation, bioaccumulation, long transport distance, Remediation of PBDEs pollution has become a research hotspot in the field of environmental protection. In this study, PBDEs with decabromodiphenyl ether (BDE-209) were selected to study the feasibility of removing polybrominated diphenyl ethers (PBDEs) from water and soil by nanometer zero-valent iron supported by sepiolite. In this paper, the modified sepiolite with hydrochloric acid as the carrier, Sepiolite supported nanocrystalline zero-valent iron was successfully prepared. The experimental results of BDE-209 removal in aqueous phase showed that the sipiolite supported nano-zero-valent iron had a good removal effect on BDE-209 in water. The removal rate of BDE-209 was almost 100% after 24h reaction. The removal of decabromodiphenyl ether was combined with degradation and adsorption. Reducing the initial concentration of BDE-209 and decreasing the initial pH of solution can improve the removal efficiency of BDE-209. BDE-209 degradation process is a gradual debromination process. The removal process of BDE-209 in water phase by sepiolite loaded nZVI was in accordance with the quasi first order kinetic equation. The experimental results of BDE-209 removal in soil showed that Sepiolite loaded nano zero valent iron had excellent removal effect on BDE-209 in soil. The removal rate of BDE-209 in soil by sepiolite loaded nZVI was 29.44. The dosage of nano-zero valent iron loaded with sepiolite was increased. Decreasing the initial pH of soil solution can improve the removal efficiency of BDE-209, and the rate of BDE-209 migration from soil phase to sepiolite phase can be reduced by soil organic matter, which leads to the reduction of removal efficiency of BDE-209 in soil by sepiolite loaded nZVI.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X592

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