19FNMR and fluorescence quantization of photocatalysis degradation of aromatic halogen in the presence ZnS nanoparticles

CHED 287

Nguyen Nguyen, nn5342@students.armstrong.edu, Beverly Harris, Delana A. Nivens, nivensde@mail.armstrong.edu, and Will E. Lynch, lynchwil@mail.armstrong.edu. Department of Chemistry, Armstrong Atlantic State University, 11935 Abercorn St., Savannah, GA 31419
Polyphosphate capped ZnS nanoparticles were used as photocatalyst in order to degrade halogenated aromatic compounds. Photoreduction results from UV exposure of ZnS nanoparticles and the halogenated compounds to light greater than 300 nm. The presence of byproducts from the photodegradation such as halogen ions (ex. chloride, bromide) was detected through fluorescence quenching of a halogen sensitive dye, lucigenin, while the fluoride presence was detected by 19FNMR spectroscopy. 19FNMR detection of fluoride ion showed evidence of the rate of degradation to be dependent on hydroxide ion concentration in solution. Through the detection of the degradation of the halogenated aromatic compounds, the turnover rate and quantity of halide produced was also investigated to determine the pH and matrix effects in the process.
 

Undergraduate Research Poster Session: Nanotechnology
11:00 AM-1:00 PM, Monday, 27 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster

Division of Chemical Education

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006