本文選題：泰樂菌素 + 石墨烯　； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：抗生素在醫(yī)藥和養(yǎng)殖業(yè)中的大量使用,使得眾多抗生素以原藥或代謝物的形式進(jìn)入環(huán)境,由于這些抗生素仍具有一定的生物活性,將可能對(duì)生態(tài)環(huán)境產(chǎn)生潛在的危害。近年來,抗生素作為一種新興的“假持久性”污染物,其在環(huán)境中的環(huán)境行為及污染控制受到了環(huán)境工作者的廣泛關(guān)注。抗生素的去除技術(shù)存在著處理效率低,產(chǎn)生二次污染等缺點(diǎn)。Ti O2光催化氧化具有性質(zhì)穩(wěn)定,無(wú)二次污染以及對(duì)污染物的礦化程度高等優(yōu)點(diǎn),但由于其光催化特性只能在紫外光條件下激發(fā),限制了其在污染控制領(lǐng)域的應(yīng)用。為了提高對(duì)可見光的利用效率,本研究利用石墨烯對(duì)二氧化鈦進(jìn)行改性處理,制備出一種新型石墨烯-二氧化鈦復(fù)合光催化材料(G-Ti O2),以泰樂菌素(tylosin,TYL)作為典型抗生素的代表,研究了G-Ti O2對(duì)TYL的吸附行為及在可見光條件下的光解特性,為抗生素污染控制提供技術(shù)支持。研究發(fā)現(xiàn):1.以石墨烯為模版可以制備出一種石墨烯-二氧化鈦復(fù)合材料,二氧化鈦主要呈線狀形式,其直徑為20~50nm,排列在石墨烯表面,石墨烯和二氧化鈦以Ti-O-C化學(xué)鍵結(jié)合,且石墨烯-二氧化鈦復(fù)合材料中Ti O2為銳鈦礦晶型。2.TYL在G-Ti O2上的吸附作用呈明顯的非線性,吸附過程滿足準(zhǔn)二級(jí)動(dòng)力學(xué)模型,吸附數(shù)據(jù)可以用Langmuir模型較好的擬合,吸附容量隨著溶液p H值的增加而增加,總體吸附過程可能是靜電作用、范德華作用力、氫鍵作用、表面絡(luò)合作用共同作用的結(jié)果。3.在模擬自然光照條件下,G-Ti O2對(duì)TYL具有較好的光解效果,石墨烯摻雜量為1%時(shí),復(fù)合材料對(duì)TYL的光解率可達(dá)55.4%,且具有較好的重復(fù)利用率。光解率與TYL的初始濃度呈反比;且隨溶液p H值的增大呈現(xiàn)先增加后減小的趨勢(shì)。G-Ti O2對(duì)TYL的光解機(jī)制可能與催化劑的電子-空穴分離效率提高有關(guān)。
[Abstract]:The extensive use of antibiotics in medicine and aquaculture makes many antibiotics enter the environment in the form of raw drugs or metabolites. Because these antibiotics still have certain biological activities, they may cause potential harm to the ecological environment. In recent years, antibiotics as a new "pseudo-persistent" pollutant, its environmental behavior in the environment and pollution control has been widely concerned by environmental workers. The removal technology of antibiotics has some disadvantages, such as low treatment efficiency, secondary pollution and so on. TIO 2 photocatalytic oxidation has the advantages of stable properties, no secondary pollution and high mineralization degree of pollutants. However, its photocatalytic properties can only be excited under ultraviolet light, which limits its application in pollution control field. In order to improve the efficiency of visible light utilization, a novel graphene composite photocatalytic material, G-TiO _ 2, was prepared by modifying titanium dioxide with graphene, and tylosin TYL was used as the representative of antibiotics. The adsorption behavior of G-Ti O 2 to TYL and the photolysis characteristics of G-Ti O 2 under visible light were studied in order to provide technical support for the control of antibiotic contamination. The study found that 1: 1. A kind of graphene-titanium dioxide composite can be prepared by using graphene as template. Titanium dioxide is mainly in linear form, and its diameter is 20 ~ (50) nm, which is arranged on the surface of graphene. Graphene and titanium dioxide are bonded with Ti-O-C chemical bond. Moreover, the adsorption of TIO _ 2 on G-Ti O _ 2 in graphene TIO _ 2 composite is obviously nonlinear, and the adsorption process satisfies the quasi-second-order kinetic model. The adsorption data can be well fitted by Langmuir model. The adsorption capacity increases with the increase of pH value of the solution. The total adsorption process may be the result of electrostatic interaction, van der Waals interaction, hydrogen bonding and surface complexation. Under the simulated natural light condition, G-TiO _ 2 has a good photodegradation effect on TYL. When the content of graphene is 1, the photolysis rate of the composite to TYL can reach 55.4%, and it has good reuse efficiency. The photolysis rate is inversely proportional to the initial concentration of TYL, and increases first and then decreases with the increase of pH value of the solution. The photolysis mechanism of G-TiO _ 2 on TYL may be related to the improvement of the efficiency of electron-hole separation of the catalyst.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X505;TB33

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