本文關(guān)鍵詞： 海泡石負(fù)載型納米零價(jià)鐵 多溴聯(lián)苯醚 十溴聯(lián)苯醚 去除 土壤修復(fù)　出處：《上海應(yīng)用技術(shù)學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：多溴聯(lián)苯醚(PBDEs)由于其難降解、生物蓄積性,傳輸距離遠(yuǎn),修復(fù)PBDEs污染已成為環(huán)境保護(hù)領(lǐng)域的一個(gè)研究熱點(diǎn)。本研究選擇十溴聯(lián)苯醚(BDE-209)為代表性的PBDEs,研究海泡石負(fù)載型納米零價(jià)鐵去除水體和土壤中多溴聯(lián)苯醚的可行性。本課題以鹽酸改性后的海泡石為載體,成功制備了海泡石負(fù)載型納米零價(jià)鐵。水相中BDE-209的去除實(shí)驗(yàn)結(jié)果表明,海泡石負(fù)載納米零價(jià)鐵對水中BDE-209具有良好的去除效果,反應(yīng)進(jìn)行24h后的BDE-209去除率幾乎達(dá)到100%。十溴聯(lián)苯醚的去除是降解和吸附共同作用的。提高負(fù)載型納米零價(jià)鐵的投加量、降低BDE-209的初始濃度以及減小溶液的初始pH可以提高BDE-209的去除效率。BDE-209的降解過程是一個(gè)逐步脫溴的過程,海泡石負(fù)載型nZVI對水相中BDE-209的去除過程符合準(zhǔn)一級動力學(xué)方程。土壤中BDE-209的去除實(shí)驗(yàn)結(jié)果表明,海泡石負(fù)載型納米零價(jià)鐵對土壤中的BDE-209具有極好的去除效果,在反應(yīng)進(jìn)行16d后,海泡石負(fù)載型nZVI對土壤中BDE-209的去除率為29.44%。提高海泡石負(fù)載型納米零價(jià)鐵的投加量、適量降低土壤溶液的初始pH可以提高BDE-209的去除效率。土壤有機(jī)質(zhì)會降低BDE-209由土壤相遷移到海泡石相的速率,導(dǎo)致海泡石負(fù)載型nZVI對土壤中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.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X592

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本文編號：1516539