Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5747
標題: 奈米碳管/二氧化鈦複合材料光降解液相苯、甲苯、乙苯、二甲苯之研究
Photocatalytic degradation of BTEX from aqueous solution with CNTs/TiO2 nanocomposites
作者: 陳彥彤
Chen, Yen-Tung
關鍵字: Benzene

Toluene
Ethylbenzene
Xylene
Carbon nanotubes/titanium dioxide
Photocatalytic
甲苯
乙苯
二甲苯
奈米碳管/二氧化鈦
光催化
出版社: 環境工程學系所
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摘要: 本研究係利用奈米碳管/二氧化鈦之奈米複合材料分解水中芳香環類溶劑苯(benzene)、甲苯(toluene)、乙苯(ethylbenzene)、二甲苯(xylene),簡稱BTEX。研究使用的奈米碳管(carbon nanotubes, CNTs)以次氯酸鈉改質,增加CNTs表面含氧官能基,再與二氧化鈦(titanium dioxide, TiO2)表面的氫氧基以類似酯化型式(ester-type)相互接合,使TiO2有效分佈於CNTs表面,減少顆粒的聚集,增加表面活性區。在不同碳管比例下之CNT/TiO2對BTEX之轉化率依序為10%>5%>20%>30%。由批次光降解實驗顯示,10%-CNT/TiO2在400oC鍛燒下,劑量1.0g/L時對BTEX有較佳的轉化率和反應速率,並且比TiO2和Degussa P25高。背景實驗之結果看出,非光催化所造成BTEX之去除效率皆在19.6%以下,說明整體光反應過程以光催化為主要的機制。水中影響因子實驗顯示,當pH在中性範圍內、添加濃度範圍在10mM以下的H2O2時,對BTEX之轉化率與反應速率皆有提升的趨勢,然而,受離子強度的影響並不顯著。 綜合以上研究結果,添加適量的CNTs與TiO2複合將能有效提升對BTEX轉化率以及反應速率,於廢水處理中具有相當的應用潛力。
Carbon nanotube/titanium dioxide(CNT/TiO2) nanocomposites were prepared by the sol-gel method and CNTs were oxidized by NaOCl solution before prepared the nanocomposites. TiO2 nanoparticles were chemically absorbed at CNTs defect sites via an ester-type linkage (esterification) between carboxylic acid groups of the oxidized CNTs surfaces and the hydroxyl groups at the surface of the TiO2 nanoparticles. CNT/TiO2 can enhance the photocatalytic activity of benzene, toluene, ethylbenzene and xylene (BTEX) photodegradation in an aqueous solution since CNTs will increase the specific surface area(reactive sites) and reduce the rate of electron/hole pairs recombination. The conversion and rate constant of BTEX photodegradation for CNT/TiO2 had optimal conditions at 1.0 g/L, 10%CNT contents, and 400oC calcinations temperature, respectively, which were much higher than TiO2 and Degussa P25. The reaction obeys pseudo-first-order kinetics. The removal efficiency for BTEX were less than 19.6% from the background experiment, which including photolysis and dark reaction. This means that major mechanism in the whole photoreaction process was photocatalytic degradation. At the influence of aqueous parameters on the rate constant of BTEX photodegradation increased with solution pH and the H2O2 dosage at low concentration, but appeared no remarkable change with solution ionic strength. A comparative study of the effect of initial BTEX concentration on the reaction rate showed that the rate constant decreased with increased the initial concentration of BTEX under the same conditions. This suggests that CNTs exhibit a synergistic effect and can increase the efficiency of electron transfer from TiO2 to CNTs in enhancing the photocatalytic activity. Thus, this study showed the potential use of CNT/TiO2 nanocomposite in degradation of BTEX from wastewater.
URI: http://hdl.handle.net/11455/5747
其他識別: U0005-1307201019530200
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1307201019530200
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