以液相沉積法製備二氧化鈦薄膜處理苯甲酸廢水

水是地球上是一個重要的資源，但隨著工業的發展，可用的水資源也不斷的減少。苯甲酸是合成許多化合物例如對苯二甲酸的前驅物，因此對苯二甲酸廢水中及其他許多工業廢水均含有苯甲酸。一般而言此類化合物廢水均無法以一般廢水處理方式或是生物處理加以完全分解，高級氧化程序便成為可行之處理方式之一。本研究是利用固定化二氧化鈦薄膜以光催化反應器去降解含苯甲酸的廢水。先經由實驗去測試二氧化鈦光觸媒反應的效果，再利用修正過的液相沉積法及以實驗設計法去製備固定化二氧化鈦薄膜，並找出研究中最好的製備條件。此外，並在各種操條件下，以製備光觸媒進行分解苯甲酸之動力學研究。研究變因包含攪拌速度、初始苯甲酸濃度、初始酸鹼值以及反應溫度。結果顯示最理想的薄膜製備條件為前處理時間6小時、氫氧化鈉濃度10N、液相沉積法中二氧化鈦濃度為5000 ppm、沉積時間4小時、塗佈次數3次、煅燒溫度350oC、煅燒時間3小時。最理想的處理條件為攪拌速度600 rpm、苯甲酸濃度為5 ppm、pH值為3和反應溫度為55 oC，在此條件下經過120分鐘降解苯甲酸百分比可達42%。此一製備與操作條件可以用以評估程序操作所需的二氧化鈦薄膜面積與操作條件，以使得苯甲酸廢水排放合於排放標準。

關鍵字

二氧化鈦；光催化反應器；苯甲酸

並列摘要

Water plays an important role for human use in world, but the availability of water resource for human or industrial use is decreased continuously with industrial evolvement. The benzoic acid (BA) is a precursor for many chemical compounds such as terephthalic acid (TPA). So, terephthalic acid wastewater and other industrial wastewaters include benzoic acid and other hazardous materials. In general, such toxic and cyclic compounds wastewater can not be treated by normal sewage treatment process or biological treatment. Thus, the advanced oxidation processes (AOPs) are a feasible method nowadays. The immobilized TiO2 thin film in a photocatalytic reactor is used to degrade benzoic acid wastewater in this study. First, the efficiency of removing benzoic acid by TiO2 photocatalytic reaction was tested. The immobilized TiO2 thin film reactor was prepared using revised liquid phase deposition (LPD) method and preparing design of experiment. The best prepared conditions were found by method of design of experiment. Finally, several titanium dioxide photocatalyst coated on glass plate were prepared under the same conditions and a series of benzoic acid decomposition kinetic study was conducted. The operational factors contain agitation speed, initial benzoic acid, initial pH and reaction temperature. According to results, the best conditions of prepared TiO2 thin film is that preprocess is 6 hrs, NaOH concentration is 10 N, TiO2 concentration in LPD is 5000 ppm, subsidence time is 4 hrs, coating times is 3 times and calcination temperature and time is 350oC and 3 hrs. The best conditions of BA degradation are that agitation speed is 600 rpm, initial benzoic acid is 5 ppm, initial pH is 3 and reaction temperature is 55oC, under conditions that the benzoic acid can be remove percentage of 42. Using the preparing condition of TiO2 thin film and the conditions of BA degradation can be used to evaluate the surface of TiO2 thin film required and operational conditions that the benzoic acid wastewater can satisfy the effluent standards.

並列關鍵字

Photocatalytic reactor ； Benzoic acid ； TiO2

參考文獻

Andreozzi, R., V. Caprio, A. Insola and R. Marotta (1999), “Advanced oxidation processes (AOP) for water purification and recovery,” Catalysis Today 53(1): 51-59.

Ding, Y., C. Yang, L. Zhu and J. Zhang (2010), “Photoelectrochemical activity of liquid phase deposited TiO2 film for degradation of benzotriazole,” Journal of Hazardous Materials 175(1-3): 96-103.

Fares, A. M. (2007), “Degradation of cyanobacteria anatoxin-a by advanced oxidation processes,” Separation and Purification Technology 57(1): 85-93.

Fernandez, A., G. Lassaletta, V. M. Jimenez, A. Justo, A. R. Gonzalez-Elipe., J. M. Herrmann, H. Tahiri and Y. Ait-Ichou (1995), “Preparation and characterization of TiO2 photocatalysts supported on various rigid supports (glass, quartz and stainless steel). Comparative studies of photocatalytic activity in water purification,” Applied Catalysis B: Environmental 7(1-2): 49-63.

Fujishima, A. and K. Honda (1972), “Electrochemical photolysis of water at a semiconductor electrode,” Nature 238(5358): 37-38.

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以液相沉積法製備二氧化鈦薄膜處理苯甲酸廢水

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