【摘要】：近些年來,在各種水環(huán)境中均不同程度的檢測出抗生素。不同環(huán)境介質(zhì)中環(huán)丙沙星的濃度雖然比較低但可能誘導(dǎo)病原菌產(chǎn)生耐藥性對生態(tài)系統(tǒng)和人類健康產(chǎn)生嚴(yán)重威脅。因此研究含環(huán)丙沙星污水的處理具有重要的現(xiàn)實意義。常用的方法有:物理法、化學(xué)法、生物處理方法等,其中吸附法因其投資小、工藝簡單、操作方便而被廣泛使用。本文篩選了對環(huán)丙沙星有良好吸附作用的吸附劑并確定了它的最優(yōu)吸附條件,且對其進行了浸漬改性�？疾炝宋綍r間、初始濃度、溫度、pH、水質(zhì)等因素對改性活性炭吸附水中環(huán)丙沙星效果的影響。利用等溫線模型和動力學(xué)模型對吸附數(shù)據(jù)進行擬合,并對其的吸附性能和吸附機理進行探究。通過BET,XRD對SDBS改性活性炭進行了表征。主要研究結(jié)果如下:(1)不同吸附劑(沸石、活性氧化鋁、高嶺土、竹炭、活性炭、弗羅里硅土、蒙脫石)對水中的環(huán)丙沙星吸附實驗。表明活性炭對環(huán)丙沙星的吸附效果最好。(2)通過采用酸、堿、鹽、表面活性劑等對活性炭進行浸漬法改性。探究了不同的改性劑濃度、浸泡時間和固液比對改性活性炭對環(huán)丙沙星吸附容量的影響。確定最佳的改性方法為:用2g/L的SDBS以1:10的固液比浸泡活性炭4h。在環(huán)丙沙星溶液初始濃度為5mg/L時,SDBS-AC對環(huán)丙沙星的吸附量為27.1mg/g,而相同條件下AC對環(huán)丙沙星的吸附量為18.32mg/g,改性后比改性前吸附容量提高了50%。(3)SDBS-AC吸附動力學(xué)研究結(jié)果表明,在實驗最初4h吸附速率較快,然后逐漸減緩,在10h左右達(dá)到吸附平衡。通過對改性活性炭的吸附速率曲線進行擬合表明其更符合擬二級動力學(xué)方程。(4)SDBS-AC吸附熱力學(xué)研究結(jié)果表明,改性活性炭對環(huán)丙沙星的吸附行為可用Langmuir吸附等溫線描述。隨著溫度的升高,吸附容量增大。(5)改性活性炭的比表面積相對未改性活性炭比表面積減小,但是孔徑卻略微增大。其改性前后的晶體結(jié)構(gòu)未有改變。(6)對改性活性炭過程中所使用的改性劑進行安全性評價,符合國家生活飲用水安全標(biāo)準(zhǔn)。(7)改性活性炭在去離子水中對環(huán)丙沙星的吸附效果要好于自來水中的吸附效果。
[Abstract]:In recent years, antibiotics have been detected in various water environments to varying degrees. Although the concentration of ciprofloxacin in different environmental media is relatively low, it may induce drug resistance of pathogenic bacteria, which may pose a serious threat to ecosystem and human health. Therefore, it is of great practical significance to study the treatment of wastewater containing ciprofloxacin. The commonly used methods include physical method, chemical method, biological treatment method and so on. Adsorption method is widely used because of its small investment, simple process and convenient operation. In this paper, the adsorbents with good adsorption capacity for ciprofloxacin were screened and the optimal adsorption conditions were determined, and the adsorbents were modified by impregnation. The effects of adsorption time, initial concentration, temperature and water quality of pH, on ciprofloxacin adsorption by modified activated carbon were investigated. The adsorption data were fitted by isothermal model and kinetic model, and the adsorption performance and adsorption mechanism were investigated. SDBS modified activated carbon was characterized by BET,XRD. The main results are as follows: (1) the adsorption of ciprofloxacin by different adsorbents (zeolite, activated alumina, kaolin, bamboo charcoal, activated carbon, Florisil, montmorillonite) in water. The results showed that the adsorption of ciprofloxacin on activated carbon was the best. (2) the activated carbon was modified by impregnation with acid, alkali, salt and surfactant. The effects of different modifier concentration, immersion time and solid-liquid ratio on the adsorption capacity of ciprofloxacin on modified activated carbon were investigated. The optimum modification method was as follows: the activated carbon was soaked in the SDBS of 2g/L for 4 h at 1:10 solid-liquid ratio. When the initial concentration of ciprofloxacin is 5mg/L, the adsorption amount of ciprofloxacin by SDBS-AC is 27.1 mg / kg, and that of ciprofloxacin by AC is 18.32 mg / kg under the same conditions. The adsorption capacity after modification was 50% higher than that before modification. (3) the adsorption kinetics of SDBS-AC showed that the adsorption rate was faster at the first 4 h, then slowed down gradually, and reached the adsorption equilibrium at about 10 h. The curve of adsorption rate of modified activated carbon was fitted to the pseudo-second order kinetic equation. (4) the results of SDBS-AC adsorption thermodynamics study showed that the adsorption rate curve of modified activated carbon was better than that of modified activated carbon. The adsorption behavior of ciprofloxacin on modified activated carbon can be described by Langmuir isotherm. With the increase of temperature, the adsorption capacity increases. (5) the specific surface area of the modified activated carbon decreases relative to the unmodified activated carbon, but the pore size increases slightly. The crystal structure did not change before and after modification. (6) the safety of modifiers used in the process of modified activated carbon was evaluated. (7) the adsorption effect of modified activated carbon on ciprofloxacin in deionized water is better than that in tap water. (7) the adsorption effect of modified activated carbon on ciprofloxacin in deionized water is better than that in tap water.
【學(xué)位授予單位】：安徽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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