Photocatalytic oxidation of ammonia over cadmium sulfide / titanate nanotube synthesized via microwave irradiation
Date Issued
2007
Date
2007
Author(s)
Chen, Chih-Hao
DOI
zh-TW
Abstract
Abstract
Aqueous ammonia (NH3/NH4+) is a major nitrogen-containing pollutants in wastewater. Its existence will be toxic to aquatic life and will cause fishes die. When there is high amount of ammonia in natural water, it will reduce the effect of disinfection in the treatments of tap water. Currently, there are some treatments for ammonia removal like biological nitrification, ammonia stripping, break-point chlorination and ion exchange. The photocatalytic reaction has been proved that it is an effective and a feasible method for ammonia removal . When photocatalysts are under UV illumination, the excited electron will follow a series of reaction and will produce the hydroxyl radicals (OH∙) which possess high ability of oxidation and then the ammonia will be oxidized.
The cadmium sulfide and titanate nanotubes (TNTs) were prepared by microwave hydrothermal method in this research, the efficiency of ammonia removal by using photocatalysts under different microwave conditions were also investigated. The control factors include temperature, irradiation power and Cd/S ratio. In addition to examining the effects of ammonia by the above factors, we also cooperate with the physical analysis like particle size analysis, pore volume analysis, specific surface area, SEM/EDX, XRD to make some assistant descriptions. However, the ion exchange ability of TNTs were also determined.
When there are CdS/TNTs in our photocatalytic system, the efficiency of ammonia removal was better than either only CdS or TNTs in the photocatalytic system. The result can be due to the interparticle electron transfer (IPET). Moreover, the ion exchange ability of TNTs decreased with the irradiation power increased.
Subjects
光催化
氨氮
硫化鎘
氧化鈦奈米管
微波
Photocatalytic
Ammonia
CdS
TNTs
Microwave
Type
thesis
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