【摘要】：本論文采用磁性復(fù)合有機海泡石對水體中典型內(nèi)分泌干擾物雙酚A進行了吸附試驗研究,這對目前受內(nèi)分泌干擾物質(zhì)污染的水體治理具有一定的現(xiàn)實和指導(dǎo)意義。通過對天然海泡石進行磁改性與有機改性,制得了新型水質(zhì)凈化功能材料——磁性復(fù)合有機海泡石。在磁性復(fù)合有機海泡石對雙酚A的靜態(tài)吸附試驗中,當(dāng)雙酚A初始濃度為30mg/L,初始p H=10,投加量為1g/L,以180r/min轉(zhuǎn)速于25℃恒溫振蕩箱中反應(yīng)90min時,磁性復(fù)合有機海泡石對雙酚A的去除率達到86.41%,吸附量為25.92mg/g。采用濃度為0.1mol/L的Na OH對吸附后磁性復(fù)合有機海泡石再生2h,再生后的海泡石對雙酚A的去除率可達57.94%。準(zhǔn)二級反應(yīng)動力學(xué)模型可以很好地描述磁性復(fù)合有機海泡石對雙酚A的吸附動力學(xué)行為。磁性復(fù)合有機海泡石對雙酚A的吸附初始階段發(fā)生了顆粒內(nèi)擴散。吸附活化能為11.7k J·mol-1,屬于化學(xué)吸附范圍。Freundilich等溫方程能更好地描述磁性復(fù)合有機海泡石對雙酚A的吸附熱力學(xué)行為,吸附更符合吸附劑表面不均勻吸附的特點,焓變值ΔH=-1.70 k J·mol-10,自由能ΔG0,磁性復(fù)合有機海泡石對雙酚A的吸附為自發(fā)放熱反應(yīng)。熵值ΔS(3.93 J·mol-1·K-1)為正值,表明吸附過程中吸附體系的自由度變大。經(jīng)磁性復(fù)合有機改性后海泡石的比表面積由49.67m2/g減小至18.55m2/g,等電點由9.70減小至9.10。磁性復(fù)合有機海泡石具有良好的超順磁性,飽和磁化率為14.1 emu.g-1,矯頑力為39.1Oe。電鏡掃描、FT-IR紅外、XRD以及XPS分析顯示,采用磁性復(fù)合有機改性的方法可制得負載Fe3O4磁性粒子和十六烷基三甲基溴化銨(CTMAB)的海泡石;海泡石改性過程與吸附雙酚A的過程均在海泡石表面進行。磁性復(fù)合有機海泡石對雙酚A的吸附是由離子交換主導(dǎo),結(jié)合分配作用與靜電引力共同作用完成的。
[Abstract]:In this paper, a magnetic composite organic sepiolite was used to study the adsorption of the typical endocrine disruptor bisphenol A in water, which has a certain practical and guiding significance for the treatment of water polluted by endocrine disrupting substances. Magnetic composite organic sepiolite was prepared by magnetic modification and organic modification of natural sepiolite. In the static adsorption experiment of magnetic compound organic sepiolite for bisphenol A, when the initial concentration of bisphenol A is 30 mg / L, the initial concentration of bisphenol A is 30 mg / L, the initial dosage is 1 g / L, the 90min is reacted in the constant temperature oscillation box at 25 鈩，

本文編號：2160053