Molecularly Imprinted Cellulose Sensor Strips for Selective Determination of Phenols in Aqueous Environment
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Molecularly Imprinted Cellulose Sensor Strips for Selective Determination of Phenols in Aqueous Environment Tawfik A. Khattab1*, Meram S. Abdelrahman1, Hanan B. Ahmed2, and Hossam E. Emam3 1
Dyeing, Printing and Auxiliaries Department, National Research Centre, Cairo 12622, Egypt 2 Chemistry Department, Faculty of Science, Helwan University, Cairo 11795, Egypt 3 Pretreatment and Finishing of Cellulosic Fibers, Textile Industries Research Division, National Research Centre, Giza 12311, Egypt (Received December 6, 2019; Revised February 6, 2020; Accepted February 16, 2020) Abstract: The surrounding environment is largely contaminated with phenols, and consequently qualitative and quantitative determination of phenols in water is of interest. In the current report, a low cost, naked-eye, portable and disposable cellulosic strips-based sensor was fabricated to detect phenols in aqueous media. The cellulosic filter paper was molecularly imprinted with Fe(III) to prepare strips sensor of Fe(III)-imprinted filter paper. The prepared strips were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis and Fourier-transform infrared spectroscopy. The sensitivity performance of Fe(III)-imprinted filter paper strips was monitored for a series of phenolic compounds. The colorimetric detection of gallic acid was selectively studied herein due to its greatest sensibility. The chromogenic Fe(III)imprinted filter paper strips provided an instant color shift from yellow to purple upon binding to Gallic acid in an aqueous environment, as visually noted and instrumentally detected by absorption spectral and coloration measurements. The change in color of strips attributing to sensing of Gallic acid was readout at quite low limit (0.1 ppb). This sensor performance was rationalized on formation of coordination complex between phenol and Fe+3. The facile fabricated molecularly imprinted filter paper strips could be easily used as sensor in rapid potential for colorimetric detection of phenols. Keywords: Phenols, Ferric ion, Molecular imprinting, Cellulose sensor, Colorimetric
sophisticated instrumentations, trained personnel, time consuming, and extensive purification, which restrict their broad functionalization. Colorimetric sensing processes have drawn deep interest in detection of different hazardous materials and gases due to their ability for naked-eye detection, rapidity, high sensitivity, simplicity and low cost as well as the fact that there is no necessity for any complex instrumentation [2332]. In case of phenol recognition, colorimetric sensors have been reported with some limitations, represented in requiring a sophisticated fabrication of sensor or being based on enzyme catalysis. These are disadvantageous for practical usage in large scale manufacturing due to their limited resources, expensive to purify, and can be difficult to store [33-35]. Hence, searching for using simple and applicable technique for the vi
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