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Efficient removal of Indigo Carmine dye by a separation process
Simona Caprarescu1, Alexandra Raluca Miron2, Violeta Purcar3
1Faculty of Applied Chemistry and Materials Science, Inorganic Chemistry, Physical Chemistry and Electrochemistry Department, Politehnica University of Bucharest, 1-7 Polizu Street, P.O. 011061, Bucharest, Romania.
Summary
This study demonstrates electrodialysis with ion exchange membranes effectively removes Indigo Carmine dye from solutions. Higher current intensity, up to 0.15 A, yielded over 97% color removal with increased conductivity and energy consumption.
Area of Science:
- Environmental Science
- Chemical Engineering
- Materials Science
Background:
- Indigo Carmine dye is a common pollutant in industrial wastewater.
- Conventional dye removal methods can be inefficient or generate secondary pollutants.
- Electrodialysis offers a promising alternative for dye decolorization.
Purpose of the Study:
- To develop and optimize an electrodialysis process for Indigo Carmine dye removal.
- To investigate the impact of current intensity on dye removal efficiency and energy consumption.
- To characterize the ion exchange membranes used in the process.
Main Methods:
- Batch electrodialysis using ion exchange membranes.
- Varying current intensities (0.05 A, 0.1 A, 0.15 A).
- Spectrographic analysis for color removal efficiency (CR %) and conductivity measurements.
- Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy for membrane characterization.
Main Results:
- Electrodialysis significantly increased solution pH and conductivity.
- Color removal efficiency (CR %) and energy consumption (EC) increased with higher current intensity.
- Optimal CR > 97% was achieved at a current intensity of 0.15 A.
- Membrane characterization provided insights into their performance and stability.
Conclusions:
- Electrodialysis with ion exchange membranes is a highly effective method for Indigo Carmine dye removal.
- Current intensity is a critical parameter influencing both efficiency and energy use.
- The process shows potential for industrial wastewater treatment applications.
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