發(fā)布時(shí)間：2018-07-03 15:11

  本文選題：粘土礦物 + 吉非羅齊��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：在再生水回灌過(guò)程中,其中所含的藥物及個(gè)人護(hù)理用品(PPCPs)會(huì)產(chǎn)生地下水污染風(fēng)險(xiǎn)。因而研究這些污染物在土壤中的吸附特征將會(huì)為地下水污染風(fēng)險(xiǎn)評(píng)價(jià)提供重要的參考信息。本研究選擇了水環(huán)境中頻繁檢測(cè)到的血脂調(diào)節(jié)藥-吉非羅齊為PPCPs的代表,通過(guò)批實(shí)驗(yàn)方法,結(jié)合X射線衍射和傅里葉轉(zhuǎn)換紅外光譜表征手段,研究了土壤中廣泛存在的兩種粘土礦物蒙脫土和高嶺土對(duì)吉非羅齊的吸附。主要得出以下結(jié)論:(1)蒙脫土和高嶺土對(duì)吉非羅齊的吸附量均隨溶液初始p H(3~11)的增大而減小,且在p H為3時(shí)達(dá)到最大,最大吸附量分別為0.111 mg/g和0.263 mg/g。溶液p H變化通過(guò)改變吉非羅齊的存在價(jià)態(tài)及粘土礦物的表面電荷特征來(lái)影響吸附。較高p H(4~11)條件下,兩者之間存在較強(qiáng)的靜電斥力而抑制吸附。(2)無(wú)機(jī)離子種類和強(qiáng)度會(huì)對(duì)粘土礦物吸附吉非羅齊產(chǎn)生影響,既包括促進(jìn)作用,也包括抑制作用,這與溶液中離子引入引起的粘土礦物與吉非羅齊之間靜電斥力減弱、鹽析效應(yīng)有關(guān)。較高離子強(qiáng)度(0.05 M~1 M)下,Ca2+與吉非羅齊競(jìng)爭(zhēng)蒙脫土上吸附點(diǎn)位的能力強(qiáng)于Na+。與Na Cl相比,Ca Cl2作為背景溶液對(duì)粘土礦物吸附吉非羅齊的促進(jìn)作用更強(qiáng),表明陽(yáng)離子鍵橋?qū)ξ骄哂兄匾绊憽?3)溶解性有機(jī)質(zhì)(DOM)對(duì)粘土礦物吸附吉非羅齊的影響與其濃度及粘土礦物的類型有關(guān)。DOM對(duì)高嶺土吸附吉非羅齊的影響程度比蒙脫土要小,這與其在高嶺土表面有較高的親和性,與吉非羅齊競(jìng)爭(zhēng)表面吸附點(diǎn)位的能力更強(qiáng)有關(guān)。實(shí)驗(yàn)及X射線衍射和傅里葉轉(zhuǎn)換紅外光譜表征結(jié)果表明,DOM的引入,使得粘土礦物-DOM-吉非羅齊三者之間主要發(fā)生了共吸附作用。(4)蒙脫土和高嶺土的吸附特征不同,同等條件下高嶺土對(duì)吉非羅齊的吸附量普遍要比蒙脫土大,這與高嶺土具有較小的表面電荷密度以及蒙脫土與吉非羅齊之間更強(qiáng)的靜電斥力有關(guān),從而使高嶺土更能控制吉非羅齊遷移至地下水的污染風(fēng)險(xiǎn)。
[Abstract]:In the process of recharge of reclaimed water, the medicines and personal care products (PPCPs) may cause groundwater pollution risk. Therefore, studying the adsorption characteristics of these pollutants in soil will provide important reference information for groundwater pollution risk assessment. In this study, the frequently detected lipid regulator in water environment, Gifetozil, was chosen as the representative of PPCPs. The method of batch experiment combined with X-ray diffraction and Fourier transform infrared spectroscopy (FTIR) was used to characterize PPCPs. The adsorption of two kinds of clay minerals, montmorillonite and kaolin, on Jifeilozi was studied. The main conclusions are as follows: (1) the adsorption capacity of montmorillonite and kaolinite for chiferozil decreases with the increase of initial pH _ (3N _ (11), and reaches the maximum at pH = 3, and the maximum adsorption capacity is 0.111 mg/g and 0.263 mg / g, respectively. The change of pH in solution affects adsorption by changing the valence state of giferozzi and the surface charge characteristics of clay minerals. At higher pH _ (4N _ (11), there is a strong electrostatic repulsive force between them to inhibit adsorption. (2) the type and strength of inorganic ions have an effect on the adsorption of chiferozil by clay minerals, including both promoting and inhibiting effects. This is related to the weakening of electrostatic repulsion between clay minerals and chiferozi caused by ion introduction in solution and salting out effect. The ability of Ca ~ (2 +) and Jifeilozi to compete for the adsorption sites on montmorillonite is stronger than that of Na at higher ionic strength (0.05 M ~ (-1 M). Compared with NaCl, CaCl _ 2 as the background solution can promote the adsorption of chiferozil by clay minerals. (3) the influence of dissolved organic matter (Dom) on the adsorption of chiferozil by clay minerals is related to its concentration and the type of clay minerals. Dom has less effect on the adsorption of chiferozil by kaolin than montmorillonite. This is related to its high affinity on the surface of kaolin and its stronger ability to adsorb on the competitive surface of Jifeilozi. The results of experiment, X-ray diffraction and Fourier transform infrared spectroscopy (FTIR) show that the introduction of Dom leads to the coadsorption of clay mineral -DOM-Jifeilozzi. (4) the adsorption characteristics of montmorillonite and kaolin are different. Under the same conditions, the adsorption capacity of kaolin to jifeilozi is generally larger than that of montmorillonite, which is related to the lower surface charge density of kaolin and the stronger electrostatic repulsion between montmorillonite and giferozil. Thus, kaolin can better control the pollution risk of Jifeiloqi migration to groundwater.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X53

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