A polyethylenimine/salicylaldehyde modified cellulose Schiff base for selective and sensitive Fe3+ detection. (15th January 2020)

• Record Type: Journal Article
• Authors: Fan, Jiang; Zhang, Sufeng; Xu, Yongshe; Wei, Ning; Wan, Ben; Qian, Liwei; Liu, Ye
• Is Part Of: Carbohydrate polymers. Volume 228(2020)
• Publication Date: 2020-01-15
• Subjects: Cellulose -- Polyethylenimine -- Schiff base -- Metal ion detection -- Colorimetric sensor; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.115379
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: A colorimetric sensor was prepared by cellulose/polyethylenimine/salicylaldehyde. Visual, highly selective and sensitivity detection for Fe 3+ has been achieved. DFT provided more supplement for the detection performance of the sensor. Sensing mechanism of Fe 3+ by the sensor was proposed based on UV and PL analysis. Abstract: We describe a new solid-state colorimetric sensor synthesized by micro-crystalline cellulose (MCC) in the presence of polyethylenimine (PEI) and salicylaldehyde (SA) via an oxidation process and two successive Schiff base reactions. The formation of the Fe 3+ complex led to color change detectable by eye, as well as an absorption peak at 501 nm causing fluorescence quenching. The signal was linear with the concentration ranging from 4 to 20 ppm; the detection limit is 0.01 ppm, making this a sensitivity and reliable monitoring platform for Fe 3+ detection. Orbital electron distribution and computational studies were also carried out using density functional theory (DFT) to better supplement the sensor's detection performance. Finally, the sensing mechanism is discussed in detail.