本文選題：雙酚A　切入點：鐵礦物　出處：《中國地質(zhì)大學(xué)(北京)》2016年碩士論文

【摘要】：雙酚A是一種典型的環(huán)境內(nèi)分泌干擾物,在工業(yè)生產(chǎn)和日常生活中應(yīng)用廣泛。近年來,在各類環(huán)境介質(zhì)中的檢出日益頻繁,由于其具有生物致毒效應(yīng),受到越來越多的關(guān)注。本文選取了三種土壤常見礦物水鐵礦(包括含Si水鐵礦)、針鐵礦和菱鐵礦,通過靜態(tài)吸附批實驗,輔以各種表征手段(XRD、Raman、SEM/TEM-EDX、BET-BJH、XPS、FTIR、TGA),旨在研究雙酚A在不同類型含鐵礦物上的吸附行為。實驗結(jié)果表明:(1)水鐵礦、針鐵礦和菱鐵礦對雙酚A的去除率分別為54%、16%、2%,這是因為,同針鐵礦和菱鐵礦相比,水鐵礦具有更大的比表面積、更小的顆粒尺寸和孔徑,可提供更多的活性吸附位。雙酚A與水鐵礦、針鐵礦和菱鐵礦的動力學(xué)過程均符合準(zhǔn)二級動力學(xué)方程,反應(yīng)平衡時間分別為12、6、6h;反應(yīng)溶液初始pH的改變對反應(yīng)體系的影響并不明顯。(2)雙酚A與水鐵礦、針鐵礦和菱鐵礦的等溫吸附實驗均可用Freundlich模型擬合。其中,菱鐵礦的等溫吸附結(jié)果更加符合Henry線性模型,表明其吸附過程為物理吸附。而雙酚A與水鐵礦、針鐵礦的作用過程則是物理吸附和表面化學(xué)吸附共同作用的結(jié)果。(3)溶液中Fe(Ⅱ)的存在,對水鐵礦反應(yīng)體系影響不大,而對針鐵礦組和菱鐵礦組有較為明顯的促進作用;而Fe(Ⅲ)的存在,對水鐵礦組具有明顯的抑制作用,對針鐵礦和菱鐵礦組影響不大(微弱促進作用)。這可能是與鐵的存在狀態(tài)有關(guān)。(4)雙酚A與三種不同比例含Si水鐵礦(5SiFh、10SiFh和20SiFh)的動力學(xué)過程均符合準(zhǔn)二級動力學(xué)方程,平衡時間分別為12、6、6h,且其作用過程不僅與其比表面積、顆粒大小等物理因素有關(guān),還受到含Si水鐵礦化學(xué)組成的影響。隨著Si含量的增加,SiFh吸附雙酚A的量逐漸減少。(5)由于水鐵礦本身具有較好的緩沖能力,反應(yīng)初始pH值并不是影響雙酚A與SiFh的反應(yīng)過程的主要因素;共存離子(Na~+、Ca~(2+))含量的增加,均會抑制反應(yīng)的進行,且Ca~(2+)抑制作用強于Na~+。
[Abstract]:Bisphenol A (BPA) is a typical environmental endocrine disruptor, which is widely used in industrial production and daily life. In recent years, bisphenol A has been detected more and more frequently in various environmental media, because of its biological toxic effect. More and more attention has been paid to it. In this paper, three common minerals in soil, including Si-bearing water ore, goethite and siderite, were selected, and the static adsorption batch experiments were carried out. A variety of characterization methods are used to study the adsorption behavior of bisphenol A on different types of iron bearing minerals. The experimental results show that the removal rates of bisphenol A from water ore, goethite and siderite are 544,16162.This is because, Compared with goethite and siderite, water ore has larger specific surface area, smaller particle size and pore size, and can provide more active adsorption sites. The kinetic processes of goethite and siderite are in accordance with the quasi second-order kinetic equation, the equilibrium time of the reaction is 12 ~ 6 ~ 6 h, respectively, and the effect of the initial pH of the reaction solution on the reaction system is not obvious. The isothermal adsorption experiments of goethite and siderite can be fitted by Freundlich model. The isothermal adsorption results of siderite are more consistent with Henry linear model, indicating that the adsorption process is physical adsorption. The process of action of goethite is the result of physical adsorption and surface chemisorption. The existence of Fe (鈪，

本文編號：1671455