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- Title
Rapid capture and visual detection of copper ions in aqueous solutions and biofluids using a novel cellulose-Schiff base.
- Authors
Zhang, Lianwei; Wang, Ruijia; Liu, Rui; Du, Xiaolin; Meng, Ranju; Liu, Lin; Yao, Juming
- Abstract
Abstract: In this work, a novel colorimetric sensor was prepared via a cellulose-polyethylenimine-based Schiff base (cellulose-Schiff base) for capturing and detecting copper ions (Cu2+) in aquatic environments and life systems. The cellulose-Schiff base displayed continuous color changes from inherent pale yellow to deep green due to the formation of a cellulose-Schiff base-Cu2+ charge transfer complex within 30 s, indicating excellent “naked-eye” detection capability for Cu2+ ions in aqueous solution. The limit of detection (LOD) was 1.054 ppm, lower than the U.S. EPA guidelines for drinking water of 1.3 ppm. Moreover, the cellulose-Schiff base colorimetric sensor was successfully used to capture and detect exogenous Cu2+ ions in biofluids (simulated urine and bovine serum). The proposed sensing mechanism of the cellulose-Schiff base for Cu2+ ions is that N atoms (C=N and N-H) in the sensor capture and concentrate Cu2+ ions to form sensor-Cu2+ complexes, then intramolecular charge transfer occurs as a consequence. In addition, test strips based on cellulose-Schiff base were developed, and provide a convenient, cheap, sensitive, and reliable monitoring platform for on-site semi-quantitative analysis of Cu2+ ions in real samples.Graphical abstract:
- Subjects
COPPER ions; COLORIMETRIC analysis; SCHIFF bases; CELLULOSE; AQUEOUS solutions; CHELATION
- Publication
Cellulose, 2018, Vol 25, Issue 12, p6947
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-018-2083-x