本文選題：卡馬西平　切入點(diǎn)：腐殖酸　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：為研究有機(jī)質(zhì)及p H對卡馬西平在環(huán)境中遷移的影響,探索卡馬西平在土壤地下水環(huán)境中的遷移機(jī)制,本研究通過制備不同有機(jī)碳含量及p H的高嶺土-腐殖酸復(fù)合體開展了不同初始濃度的卡馬西平的吸附實(shí)驗(yàn),探討了卡馬西平在有機(jī)礦質(zhì)復(fù)合體上的吸附行為特征,在此基礎(chǔ)之上,通過控制不同溶解性有機(jī)質(zhì)的含量及組分開展了卡馬西平遷移模擬柱實(shí)驗(yàn)研究,分析了溶解性有機(jī)質(zhì)對卡馬西平遷移特征的影響,論文主要得出以下幾個結(jié)論:(1)p H影響實(shí)驗(yàn)結(jié)果表明,p H是通過影響腐殖酸來影響高嶺土-腐殖酸復(fù)合體對卡馬西平吸附的,隨有機(jī)質(zhì)含量增大,p H對Kd增大趨勢的影響表現(xiàn)為p H=7p H=4p H=10。這一現(xiàn)象的原因是隨p H由4增到10,腐殖酸由沉聚態(tài)向自由遷移態(tài)轉(zhuǎn)變,吸附點(diǎn)位逐漸增多;而腐殖酸及高嶺土上活性基團(tuán)隨p H增高去質(zhì)子化作用增強(qiáng),導(dǎo)致對卡馬西平的吸附減弱,兩個因素共同影響導(dǎo)致此結(jié)果。(2)隨復(fù)合體中有機(jī)碳含量的增加,腐殖酸在高嶺土表面都呈三層疊加,不同p H條件下,三層腐殖酸在復(fù)合體中所占含量不同,而這會影響到復(fù)合體吸附性質(zhì)。(3)柱實(shí)驗(yàn)結(jié)果表明,石英砂對卡馬西平有一定的吸附作用,且DOM的加入增強(qiáng)了卡馬西平在石英砂柱中的滯留,且濃度越高阻滯作用越強(qiáng);濃度相同時,親水組分比DOM對卡馬西平的阻滯作用弱。原因是DOM的加入提供了吸附的中間媒介,石英砂表面的硅烷醇基團(tuán)(Si-OH)作為主要的活性吸附位會和DOM形成了吸附從而間接提高了卡馬西平的吸附量;而DOM親水組分與石英砂吸附作用較強(qiáng)而在初期占據(jù)了大量吸附點(diǎn)位,導(dǎo)致實(shí)驗(yàn)前期卡馬西平未被吸附,表現(xiàn)為阻滯因子與原DOM存在時相比較小。(4)在解吸實(shí)驗(yàn)中,各柱解吸率分別為54.09%,50.96%,26.42%和37.54%,此結(jié)果表明DOM濃度越高,解吸過程越難;且當(dāng)DOM濃度相同時,與原DOM溶液相比,有親水組分存在的石英砂柱解吸率較高。此結(jié)果表明卡馬西平的解吸存在一定滯后性。這一原因是CBZ進(jìn)入石英砂及DOM分子的微空隙,束縛其中不能被解吸。
[Abstract]:In order to study the effect of organic matter and pH on the migration of carbamazepine in the environment, the migration mechanism of carbamazepine in soil and groundwater was explored. In this study, the adsorption experiments of carbamazepine with different initial concentrations of carbamazepine were carried out by preparing kaolin humic acid complexes with different organic carbon contents and pH, and the adsorption behavior of carbamazepine on organic mineral complexes was discussed. On this basis, the effects of dissolved organic matter on the migration characteristics of carbamazepine were analyzed by controlling the contents and components of different dissolved organic matter. The main conclusions of this paper are as follows: the experimental results show that the influence of H on the adsorption of carbamazepine to carbamazepine is affected by the influence of humic acid on the adsorption of carbamazepine by the kaolin humic acid complex. With the increase of organic matter content, the effect of pH on KD increasing trend is as follows: (1) the reason of this phenomenon is that with pH increasing from 4 to 10, humic acid changes from precipitation state to free migration state, and adsorption sites increase gradually. However, the adsorption of carbamazepine on humic acid and kaolin increased with the increase of pH, which led to the decrease of carbamazepine adsorption. Three layers of humic acid were superimposed on the surface of kaolin. Under different pH conditions, the content of three layers of humic acid in the complex was different, which would affect the adsorption properties of the complex. The addition of DOM enhanced the retention of carbamazepine in quartz sand column, and the higher the concentration of carbamazepine was, the stronger the blocking effect was, and when the concentration was the same, the retention of carbamazepine in quartz sand column was increased with the addition of DOM. The effect of hydrophilic component on carbamazepine was weaker than that of DOM. The reason was that the addition of DOM provided the intermediate medium for adsorption. Si-OH) on the surface of quartz sand, as the main active adsorption site, forms adsorption with DOM, which indirectly increases the adsorption capacity of carbamazepine, while the hydrophilic component of DOM has strong adsorption with quartz sand and occupies a large number of adsorption sites in the initial stage. In the desorption experiment, the desorption rates of carbamazepine were 54.09% and 37.54%, respectively. The results showed that the higher the concentration of DOM, the more difficult the desorption process was. When the concentration of DOM was the same, the desorption rate of quartz sand column with hydrophilic component was higher than that of the original DOM solution. The results showed that the desorption of carbamazepine had some lag, which was due to the entry of CBZ into quartz sand and the microvoid of DOM molecule. The binding cannot be desorbed.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X50

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