本文選題：活性炭 + 改性�。� 參考：《北京化工大學》2015年碩士論文

【摘要】：近幾十年來,抗生素的污染問題受到了越來越廣泛的關注,尤其是在飲用水中抗生素類物質也被檢測到,對人類和生態(tài)環(huán)境造成很大的威脅。因此研究如何去除這類水體污染物是勢在必行的。本文選擇不同方法對活性炭進行改性,對比了不同改性活性炭的吸附效果。選擇吸附效果較好的AC-Cu、AC-Fe和AC-Al,作為后面實驗的研究對象。首先對三種活性炭進行了表面結構和性質的分析。結果表明,經過三種浸漬改性后,活性炭的表面變得更粗糙。其中AC-Cu的比表面積降低較小,增加了碳碳雙鍵和芳香環(huán)類官能團。AC-Fe的比表面積的減少量與AC-Cu的相似,而表面的芳香環(huán)類官能團和羧基等含氧官能團都有所減少。AC-Al比表面積降低最大,羥基和羧基等含氧官能團都有所增加。并且在三種活性炭上都有相應的金屬元素的存在。研究了不同條件對三種活性炭吸附頭孢他啶效果的影響。結果表明,離子強度的升高,頭孢他啶的吸附量會有所升高。而隨著pH值的升高,三種活性炭對頭孢他啶的吸附會明顯降低。低溫更有利于吸附的進行。天然有機物腐植酸的存在并不會對頭孢他啶的吸附產生較大的影響。三種活性炭吸附頭孢他啶符合準二級動力學模型。采用準二級動力學計算出的AC-Cu對頭孢他啶的最大吸附量分別為200.0 mg·g-1(298 K)、196.1 mg.g-1(303 K)和185.2 mg·g-1(308 K),遠高于AC-Fe和AC-A1對頭孢他啶的吸附量。頭孢他啶在吸附過程中主要受顆粒內擴散和液膜擴散兩個過程控制。通過吸附等溫線及熱力學分析,發(fā)現吸附過程均為自發(fā)的、放熱的,且可較好符合Freundlich和Tempkin等溫方程。
[Abstract]:In recent decades, more and more attention has been paid to the contamination of antibiotics, especially the detection of antibiotics in drinking water, which poses a great threat to human beings and the ecological environment.Therefore, it is imperative to study how to remove these water pollutants.In this paper, different methods were chosen to modify activated carbon, and the adsorption effect of different modified activated carbon was compared.AC-CuCU AC-Fe and AC-Al, which have better adsorption effect, were selected as the experimental objects.Firstly, the surface structure and properties of three activated carbon were analyzed.The results show that the surface of activated carbon becomes rougher after three kinds of impregnation modification.The decrease of specific surface area of AC-Cu was smaller, and the decrease of specific surface area of carbon / carbon double bond and aromatic ring functional group. AC-Fe was similar to that of AC-Cu.On the other hand, the oxygen functional groups such as aromatic ring group and carboxyl group on the surface were decreased. The specific surface area of AC-Al decreased the most, and the oxygen functional groups such as hydroxyl group and carboxyl group increased.And there are corresponding metal elements on three kinds of activated carbon.The effects of different conditions on the adsorption of ceftazidime by three kinds of activated carbon were studied.The results showed that the adsorption capacity of ceftazidime increased with the increase of ionic strength.With the increase of pH, the adsorption of ceftazidime to ceftazidime was significantly decreased.Low temperature is more favorable for adsorption.The presence of natural organic humic acid does not affect the adsorption of ceftazidime.The adsorption of ceftazidime by three kinds of activated carbon was in accordance with the quasi-second-order kinetic model.The maximum adsorption amounts of ceftazidime to ceftazidime by quasi second-order kinetics were 200.0 mg / g ~ (-1) K ~ (-1) and 185.2 mg / g ~ (-1) ~ 308K ~ (-1), respectively, which was much higher than that of AC-Fe and AC-A1 for ceftazidime.Ceftazidime adsorption is mainly controlled by intragranular diffusion and liquid film diffusion.Through adsorption isotherm and thermodynamic analysis, it is found that the adsorption process is spontaneous and exothermic, and can well accord with Freundlich and Tempkin isothermal equations.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ424.1;X703

【參考文獻】

相關期刊論文 前2條

1 賈璦;胡建英;孫建仙;施嘉琛;;環(huán)境中的醫(yī)藥品與個人護理品[J];化學進展;2009年Z1期

2 解強,張香蘭,李蘭廷,金雷;活性炭孔結構調節(jié):理論、方法與實踐[J];新型炭材料;2005年02期

相關碩士學位論文 前1條

1 王霞;改性TiO_2吸附劑的制備及性能研究[D];河南工業(yè)大學;2011年

，

本文編號：1731012