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Cellulose-based colorimetric sensor with N, S sites for Ag+ detection
Lei Wang1, Cunzhi Zhang1, Hui He1
1College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China.
International Journal of Biological Macromolecules
|July 10, 2020
Summary
A new cellulose-based sensor (DAC-Tu) detects silver ions (Ag+) with a visible color change. This highly sensitive sensor offers rapid, on-site detection for Ag+ in mixed metal solutions.
Area of Science:
- Materials Science
- Analytical Chemistry
- Environmental Science
Background:
- Developing selective and sensitive sensors for heavy metal ions is crucial for environmental monitoring.
- Colorimetric sensors offer advantages for rapid, on-site detection without complex instrumentation.
- Cellulose-based materials are attractive due to their sustainability, biocompatibility, and tunable properties.
Purpose of the Study:
- To develop a novel cellulose-based colorimetric sensor (DAC-Tu) for the selective and sensitive detection of silver ions (Ag+).
- To investigate the sensing mechanism and performance of the DAC-Tu sensor for in-situ naked-eye detection of Ag+.
- To evaluate the potential application of the DAC-Tu sensor in real-world scenarios.
Main Methods:
- Synthesis of a novel cellulose-based colorimetric sensor (DAC-Tu) incorporating nitrogen (N) and sulfur (S) functional sites.
- Testing the selectivity and sensitivity of DAC-Tu in mixed metal ion solutions.
- Determining the detection limit and response time for Ag+ using naked-eye observation.
- Proposing and investigating the mechanism of visual recognition based on coordination chelation and silver sulfide formation.
Main Results:
- The DAC-Tu sensor exhibited excellent selectivity and sensitivity towards Ag+.
- A distinct color change from white to black was observed for Ag+ detection in mixed metal ion solutions.
- The naked-eye in-situ detection limit for Ag+ was determined to be 10^-6 mol/L within 10 minutes.
- Both the cellulose matrix and the grafted functional groups (CS, NH2) contributed to the sensor's low detection limit.
Conclusions:
- The developed DAC-Tu colorimetric sensor demonstrates high performance for the selective and sensitive detection of Ag+.
- The sensor facilitates in-situ, naked-eye detection of Ag+ with a low detection limit and rapid response time.
- The findings suggest significant application prospects for the DAC-Tu sensor in environmental monitoring and point-of-care diagnostics for silver ion detection.
