title: Zeolite-fiber integrated optical chemical sensors for detection of dissolved organics in water.
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.
authors.affiliation: Department of Petroleum and Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Junhang
authors.initials: J
authors.lastname: Dong
authors.forename: Ming
authors.initials: M
authors.lastname: Luo
authors.forename: Hai
authors.initials: H
authors.lastname: Xiao
authors.forename: Sohail
authors.initials: S
authors.lastname: Murad
authors.forename: Randy A
authors.initials: RA
authors.lastname: Normann
mesh_terms: D019840:2-Propanol / Q000032:analysis*; D000327:Adsorption; D000535:Aluminum / Q000737:chemistry; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D008567:Membranes, Artificial; D055095:Optics and Photonics; D010316:Particle Size; D010421:Pentanoic Acids / Q000032:analysis*; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D010421:Pentanoic Acids; D014867:Water; D017641:Zeolites; D000535:Aluminum; D019840:2-Propanol