Zeolite-fiber Integrated Optical Chemical Sensors for Detection of Dissolved Organics in Water
MFI zeolite coated optical fiber sensors have been developed for in situ detection of dissolved organics in water. The sensors operate by monitoring the optical reflectivity changes caused by the selective adsorption of organic molecules, i.e., 2-propanol or pentanoic acid in this study, from aqueous solutions in the zeolitic pores. Reversible and monotonic sensor signals were observed in response to the variation of 2-propanol concentration in water with fast response. However, the sensor exhibited a much slower response to pentanoic acid than to 2-propanol. It was also found that substitution of Si by Al in the MFI framework increased the adsorption of pentanoic acid that resulted in enhanced sensor responses.
J. Zhang et al., "Zeolite-fiber Integrated Optical Chemical Sensors for Detection of Dissolved Organics in Water," Langmuir, American Chemical Society (ACS), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1021/la0514967
Electrical and Computer Engineering
United States. Department of Energy
Keywords and Phrases
Optical Fiber Sensors; Organic Molecules; Optical fiber detectors; Zeolites
Article - Journal
© 2005 American Chemical Society (ACS), All rights reserved.