本研究的目的使用二氧化鈦粉末的固定化技術，能將光催化劑有效固定在石英管上，聚合物溶液是以矽酸乙酯及水為反應物，以1：4混合比於常溫下經過水解及縮聚合反應合成。以此對硝基苯進行光催化反應。探討不同晶形觸媒、不同的pH值、不同的濃度、不同的溫度、不同的溶氧等因素對硝基苯進行光催化反應的影響。
比較兩種商業化觸媒對硝基苯的去除效率，探討其在不同pH值4、7、11環境下，對0.407 mM硝基苯的降解效果，結果兩種觸媒催化速率為pH=7＞pH=4＞pH=11，又以Degussa P-25在pH=7降解效果最好。
分別以不同濃度0.407、0.813、1.220、1.626、2.439 mM硝基苯，在相同條件下反應3小時，結果為反應物的吸附速率常數Kad=0.024(mg-1L)、光催化反應之速率常數kLH= 0.244(mgL-1min-1)。
不同溫度20、30、40℃下對0.407 mM硝基苯，在相同條件下反應3小時，結果反應活化能Ea=34.45 kJ/mol，活化焓ΔH┿=0.31 kJ/mol、活化熵ΔS┿=-0.041 J/K mol。
通空氣流速分別50 cc/min、100 cc/min、150 cc/min對0.407 mM硝基苯，在相同條件下反應3小時，結果以空氣流速150 cc/min (溶氧量為7.2 ± 0.3 mg/L)的降解效果最好，反應速率常數k= (1.28 ± 0.05) × 10-2 min-1殘餘率8 %為效果最好。
以1.626 mM硝基苯，在pH=7以懸浮方式添加觸媒P-25二氧化鈦1.0 g，通空氣150 cc/min及溫度30℃的控制條件下，用鋁箔紙覆蓋反應器進行光催化10小時後，經HPLC、GCMS定性、定量分析，得到其主要中間產物主要為2-nitrophenol、3-nitrophenol、4-nitrophenol及一些未知化合物。

It is an important challenge to search a powerful and efficient pathway to degrade adverse chemicals or waste water. In this study we used immobilization powdered titanium dioxide coated on a cylindrical quartz tube to degrade nitrobenzene and alter the environmental condition in a simulated system. Variations of nitrobenzene concentration, pH value, temperature, and dissolving oxygen were studied.
Two types of commercial titanium dioxides, Degussa P-25 and Hombikat UV-100, were compared each other in the degradation efficiency of nitrobenzene. It is shown that two commercial titanium dioxides have the same reaction rate constant of pH in the order of 7 > 4 > 11 in a 3-hour degradation of 0.407 mM nitrobenzene in the origin. Moreover, Degussa P-25 has the best photodegradation efficiency in the solution of pH = 7.
For the study of concentration variation, the adsorption coefficient Kad and the reaction rate constant kLH were obtained to be 0.024 L/mg and 0.024 mg/L.min, respectively, with the concentration of nitrobenzene in 0.407, 0.813, 1.220, 1.626, and 2.439 mM.
In the temperature variation study, the reaction activation energy Ea, the enthalpy of activation H┿, and the entropy of activation S┿ were obtained to be 34.45 kJ/mol, =0.31 kJ/mol, and =-0.041 J/K.mol, respectively, with the concentration 0.407 mM of nitrobenzene under different temperatures of 20, 30, and 40oC.
We also tested the influence of the aeration in the reactor. It is shown that the greater degradation the more amount of air flow rate. In the largest amount of air flow rate of 150 mL/min used in the study, oxygen dissolved in the solution was detected to be 7.2 ± 0.3 mg/L. The reaction rate constant k was obtained to be 1.28 x 10-2 ± 0.05 min-1 in a 3-hour reaction for the residual of 8 %.
In the reaction condition of followings, 1.626 mM of nitrobenzene, pH=7, 30 oC, 150 mL/min of air flow rate for a 10-hour reaction, we identified some intermediates of 2-nitrophenol, 3-nitrophenol, 4-nitrophenol, and some other unknown chemical compounds by means of HPLC and GCMS instrumentation.

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