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Fluorescence-sensitive adsorbent based on cellulose using for mercury detection and removal from aqueous solution
1Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
International Journal of Biological Macromolecules
|April 12, 2019
Summary
A novel fluorogenic bio-adsorbent effectively detects and removes mercury (Hg II) ions from water. This adsorbent demonstrates high sensitivity, selectivity, and a significant adsorption capacity, offering a promising solution for mercury contamination.
Area of Science:
- Environmental Chemistry
- Materials Science
- Analytical Chemistry
Background:
- Mercury (Hg II) ions pose a significant environmental and health risk.
- Effective detection and removal of mercury from aqueous solutions are crucial.
- Existing methods for mercury remediation often face limitations in sensitivity or selectivity.
Purpose of the Study:
- To synthesize a novel fluorogenic bio-adsorbent for mercury ion detection and adsorption.
- To evaluate the adsorbent's sensitivity, selectivity, and adsorption capacity for Hg (II).
- To investigate the adsorption mechanism and kinetics of mercury removal.
Main Methods:
- Synthesis of a new fluorogenic bio-adsorbent.
- Detection of Hg (II) using fluorescence quenching mechanism (photo-induced electron transfer).
- Batch adsorption experiments to determine optimal conditions (concentration, time, pH).
- Analysis using Langmuir isotherm and pseudo-second-order kinetic models.
- Characterization using FTIR and SEM-elemental mapping.
Main Results:
- The synthesized bio-adsorbent exhibited high sensitivity for Hg (II) detection with a limit of detection of 84 ppb.
- The adsorbent showed excellent selectivity for Hg (II) over other cations via fluorescent quenching.
- Maximum adsorption capacity was determined to be 143.88 mg/g, fitting the Langmuir isotherm model.
- Adsorption kinetics followed the pseudo-second-order model, indicating chemisorption.
Conclusions:
- The developed fluorogenic bio-adsorbent is highly effective for sensitive and selective detection and removal of mercury ions.
- The adsorbent's performance meets discharge standards, offering a viable solution for mercury-contaminated water.
- The study provides insights into the adsorption mechanism and kinetics, facilitating further application development.