Abstract
The residue derived from the alginate extraction from S. filipendula was applied for the biosorption of aluminum from aqueous medium. The adsorptive capacity of the residue (RES) was completely evaluated in batch mode. The effect of pH, contact time, initial concentration, and temperature was assessed through kinetic, equilibrium, and thermodynamic studies. The biosorbent was characterized prior and post-Al biosorption by N2 physisorption, Hg porosimetry, He pycnometry, and thermogravimetry analyses. Equilibrium was achieved in 60 min. Kinetics obeys pseudo-second-order model at aluminum higher concentrations. Isotherms followed Freundlich model at low temperature (293.15 K) and D-R or Langmuir model at higher temperatures (303 and 313 K). Data modeling indicated the occurrence of both chemical and physical interactions in the aluminum adsorption mechanism using RES. The maximum adsorption capacity obtained was 1.431 mmol/g at 293 K. The biosorption showed a spontaneous, favorable, and exotherm character. A simplified batch design was performed, indicating that the residue is a viable biosorbent, achieving high percentages of removal using low biomass dosage.
Highlights
Amidst the diverse procedures for removing toxic metals in aqueous media like precipitation, adsorption, ion exchange using resins and membrane processes, biosorption is a promising technology applied for the treatment of effluents
Plenty of materials have been investigated as a biosorbent for Al (III) removal, including biomass derived from fungi, bacteria, algae and agro-industrial residues (Lee et al 2004; Ozdemir and Baysal 2004; Sari and Tuzen 2009; Tassist et al 2010; Rajamohan et al 2014; El Houda Larbi et al 2019; Titah et al 2019)
Alginate is a biopolymer that composes the structure of brown algae and is considered to play a major role on the uptake of metals by biosorption (Davis et al 2003)
Summary
Amidst the diverse procedures for removing toxic metals in aqueous media like precipitation, adsorption, ion exchange using resins and membrane processes, biosorption is a promising technology applied for the treatment of effluents. This process presents several advantages mainly for being ecofriendly and having low cost. Alginate is a biopolymer that composes the structure of brown algae and is considered to play a major role on the uptake of metals by biosorption (Davis et al 2003) This compound has commercial value since it is used extensively in the cosmetics, food and pharmaceutical industry due to characteristics such as its viscosity and its stabilizing properties. The alginate extraction process produces a fibrous residue with no added commercial value
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