Can any one help me to explain the reasons for following point:
I am studying photocatalytic degradation of acetaminophen in polluted water using TiO2 nanoparticles...when I test the effect of catalyst dosage of CM-n-TiO2 (0.5, 1, 1.5, 2 g L-1) on photocatalytic degradation of 3 ppm of acetaminophen under illumination of UV light. The results which has been obtained;
* Active of solution was measured by determining the Absorbance of solution , as following:
Concentration Activation
3 0.191
** Time (min)of soln under UV
light in incubator
Absorbance of soln with concentration gl-1
Min 0.5 1 1.5 2
Zero of irradiation of UV (10 min) 0.192 0.194 0.196 0.250
My question, why the absorbance at 2 g/l of CM-n-TiO2 was greater than absorbance of active solution ?
Thank you ...
Dear Hasna M. Gadi,
This is the behavior of the photodegradation of the acetaminophen upon light exposure. When decomposition of acetaminophen started, then new photoproducts are produced and they also showed absorbance properties. When photodegradation is prograssed, photoproducts are increasing with time that is the reason absorbance is increasing with irradiation time.
best regards,
Khan M. G. Mostofa, Ph.D
Professor
Institute of Surface Earth System Science
Tianjin University
92 Weijin Road, Nankai District, Tianjin 300072, P.R. China
Tel: +8615285007291
Email: [email protected]
Website: www.tju.edu.cn
Book: Photobiogeochemistry of Organic Matter: Principles and Practices in Water Environments published by Springer on January 2013.
If I understand correctly you are basically asking that the absorbance of 3 ppm acetaminophen solution increases after adding photocatalyst before starting UV-light illumination. Then this would be due to the scattering from the fine particles of the photocatalyst present in the 3 ppm acetaminophen solution.
- Badges
- Science topic
- Similar topics
- Analytical Chemistry
- Extraction