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URN etd-0828113-165130 Statistics This thesis had been viewed 1468 times. Download 99 times. Author Shin-Zhi Chen Author's Email Address No Public. Department Chemical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 105 Title CATALYTIC OZONATION OF BENZOIC ACID WASTEWATER BY FERROUS-IMPREGNATED MWCNTs Keyword wastewater treatment carbon nanotubes modification catalytic ozonation Benzoic acid Benzoic acid catalytic ozonation carbon nanotubes modification wastewater treatment Abstract Terephthalic acid is one of the large-scale and major products in chemical industry. During the manufacturing process, there are many contaminants in the wastewater that pollutes the environment and causes human illness or other problems. Therefore, it needs some proper treatments to degrade the pollutants in the wastewater. During terephthalic acid manufacturing process, benzoic acid is the main compound that causes high COD in the wastewater. Traditional biological treatment methods have some drawbacks or in a rut so that advanced oxidation process become the popular wastewater treatment recently.
However, Fenton’s reaction of Benzoic acid by ferrous ion produces a large amount of sludge.
In this research, multi-walled carbon nanotubes supported by ferrous ions was used to perform catalytic ozonation of Benzoic acid. It could be found from the result that carbon nanotubes adsorbed ferrous ion until saturation adsorption in two hour and the adsorption capacity for ferrous ions rose after ozonation. The optimum condition of catalytic ozonation of Benzoic acid wastewater by ferrous-impregnated multi-walled
carbon nanotubes was 0.01g dosage of carbon nanotubes, at pH3 and 20 ℃ in a one liter wastewater reactor, and it had the best degradation effect. The comparison of organics removal efficiency for fresh and recycled catalysts was carried out by two times of experiments. After the first experiment, 66.2% of ferrous ions remained on the surface of carbon nanotubes, and reduced to 64.7% after second experiment run. It indicated the ferrous ions were stabilized on the carbon nanotubes. However, the degradation efficiency was only 47% as compared with the first run due to physical structure modification on the surface. It may be caused by the active sites on carbon nanotubes surface were functionalized with acidic condition in wastewater.
Advisor Committee Tai-Shang Chen - advisor
Files Date of Defense 2013-07-30 Date of Submission 2013-08-29