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An eco‐friendly approach for copper (II) biosorption on alga Cystoseira indica and its characterization
Author(s) -
Roozegar Maryam,
Behnam Sanaz
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13044
Subject(s) - biosorption , potentiometric titration , chemistry , langmuir adsorption model , nuclear chemistry , aqueous solution , titration , adsorption , copper , ion exchange , inorganic chemistry , ion , sorption , organic chemistry
The alga Cystoseira indica was used for copper (II) removal from aqueous solutions. Effects of initial pH, ion concentration, contact time, and different pretreatments on biosorption were investigated. Potentiometric titration, chemical modification, FTIR and ICP analyses were performed to study the biosorption mechanism. Ho's pseudo‐second order model described kinetics data appropriately. Adsorption isotherm was fitted to Langmuir model with the maximum adsorption capacity of 72.1 mg g −1 at pH 4 and 25°C for 0.6 g l −1 of biomass. Strong, weak, and very weak acidities which were calculated from potentiometric titration were respectively 1.50, 1.49, and 0.67 me per g dry biomass. Sulfonate, carboxyl, and amine functional groups were involved in biosorption. Treatment with alkali and salt increased biosorption capacity, while acidic treatment decreased it. Ions of Na + , Sr 2+ , Ca 2+ , Zn 2+ , H + , and Mg 2+ were released into the solution due to copper removal which indicated that ion exchange was a mechanism of biosorption. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S323–S330, 2019