Photoassisted Catalytic Oxidation and Kinetics Studies of 2,6-Dinitro-p-Cresol in TiO2 Aqueous Suspensions with Improvement of Reacation Equipment

• Main Author: 王嘉德
• Other Authors: 陳榮輝
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/70074510567726211676

碩士 === 國立高雄師範大學 === 化學系 === 99 === The quartz tube plus ultraviolet rayirradation and the TiO2 plus sunlight are generally used during the photocatalytic process. However, the costprice of the quartz tube is high and the sunlight irradiation must be applied during much more stable time. To overcome these shortcomings, this research is has mainly focused on the application of the improved photocatalytic degradation mechanism.The Pyrex glass is in substituted for the quartz tube and sunlight irradiation is Replaced by solar tube to process polymerization retarder DNPC (4-methyl-2,6-dinitro-p-cresol)， We also discuss the influences on how the variables, like the early PH value, the speed of the airflow, the amount of the UV tubes, the quantity of the TiO2 and so on, respond to the reaction. The experimental results can be concluded as follows: (1)It is feasible to process DNPC by using photocatalytic degradation. (2)The influence of DNPC concentration in degradation is a zeroth order reacation (3)The initial pH value is not important to the reaction，and it is a zeroth order in dynamics. If initial pH is 5.2,the pH value became 6 after reaction； If initial pH is 6.0,the pH value became 7 after reaction； If initial pH is 7.8,the pH value became 9 after reaction； The best initial pH value is 6. (4)The speed of airflow(0~1 liter/min) is inversely proportional to the reaction,kobs is less with higher speed of airflow.The optimized speed of airflow is 0.25 liter/min. (5).When TiO2 (0~1.5gram/0.2 liter)increases, its kobs is increased first then reduced. The best dosage is 1.2 gram /0.2 liter. (6).The result is better with more irradiating tubes. (7)When the processing concentration of DNPC is 1.8×10-4M,the optimizes condition is as described below；pH=6; Room temperature;speed of airflow=0.25liter /min；UV of solar lamp tube=12 ; TiO2=1.2 gram/0.2 liter 。