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Zeolite-fiber integrated optical chemical sensors for detection of dissolved organics in water
Authors:Zhang Jian  Dong Junhang  Luo Ming  Xiao Hai  Murad Sohail  Normann Randy A
Institution:Department of Petroleum and Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA.
Abstract: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.
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