Efficient removal of dyes from seawater using as biosorbent the dead and living biomass of the microalga Phaeodactylum tricornutum: equilibrium and kinetics studies

Dyes are used in many applications with their consequent discharge into aquatic environments. Alternative methods of pollutant removal, such as biosorption, are currently necessary to achieve an efficient, low-cost, and environmentally friendly process. The biomasses, living and dead, from the micro...

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Bibliographic Details
Published in:Journal of applied phycology 2021-10, Vol.33 (5), p.3071-3090
Main Authors: Santaeufemia, Sergio, Abalde, Julio, Torres, Enrique
Format: Article
Language:English
Subjects:
Algae
Aquatic environment
Aquatic microorganisms
Biomass
Biomedical and Life Sciences
Biosorption
Capacity
Cells (biology)
Chemical analysis
Color removal
Dye concentrations
Dyes
Ecology
Freshwater & Marine Ecology
Kinetics
Life Sciences
Methylene blue
Microalgae
Phaeodactylum tricornutum
Photodegradation
Plant Physiology
Plant Sciences
Pollutant removal
Pollutants
Removal
Seawater
Water analysis
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Summary:Dyes are used in many applications with their consequent discharge into aquatic environments. Alternative methods of pollutant removal, such as biosorption, are currently necessary to achieve an efficient, low-cost, and environmentally friendly process. The biomasses, living and dead, from the microalga Phaeodactylum tricornutum were studied to determine their ability to remove three dyes, Methylene Blue, Crystal Violet and Safranin from seawater. The removal properties were determined as a function of contact time, initial dye concentrations, and pH, and characterized with the determination of the point of zero charge (pH PZC ) and FTIR. The highest removal capacity was obtained with crystal violet (66.4 mg g −1 ), without significant differences between both biomasses and following a pseudo-fourth order kinetics, indicating a high affinity for said dye. Maximum removal capacity for methylene blue was 18.9 mg g −1 with significant differences between both biomasses until the concentration of 10 mg L −1 , the dead biomass being more effective since this dye would present difficulties to enter the living cells. The kinetics was of pseudo-third order. Safranin obtained a removal capacity of 19.6 mg g −1 with also significant differences between both biomasses up to a concentration 
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-021-02513-0