Abstract
Biosorption is a viable alternative that can be used to remove heavy metal ions from aqueous effluents, as long as the biosorbent used is cost-effective and efficient. To highlight this aspect in this study, alginate extracted from marine red algae biomass (Callithamnion corymbosum sp.) was used as biosorbent for the removal of Cu(II), Co(II) and Zn(II) ions from aqueous media. Biosorption studies were performed in a batch system, and the biosorptive performances of the alginate were examined as function of initial solution pH, biosorbent dosage, contact time, initial metal ions concentration and temperature. The optimal experimental conditions were found: initial solution pH of 4.4, a biosorbent dose of 2.0 g/L and a temperature of 22 °C, when over 88% of Cu(II), 76% of Co(II) and 81% of Zn(II) are removed by biosorption. The modeling of the obtained experimental data show that the Langmuir isotherm model and pseudo-second kinetic model well describe the biosorption processes of studied metal ions. The maximum biosorption capacity (qmax, mg/g) increases in the order: Cu(II) (64.52 mg/g) > Zn(II) (37.04 mg/g) > Co(II) (18.79 mg/g), while the minimum time required to reach the equilibrium is 60 min. Moreover, the regeneration efficiency of alginate is higher than 97% when a 10−1 N HNO3 solution is used as desorption agent for the recovery of Cu(II), Co(II) and Zn(II) ions. All these characteristics demonstrate that the alginate extracted from marine algae has promising applications in the decontamination of industrial effluent containing metal ions.
Highlights
The industrial development of the recent decades has caused the contamination of many water sources with different types of pollutants around the world
Have examined the behavior of these biosorbents in the processes of metal ion retention from aqueous media, to highlight their applicative potential. This widespread use of marine algae biomass as a biosorbent in experimental studies is mainly determined by the following advantages: (i) they are accessible materials almost anywhere in the world, (ii) their preparation requires a small number of simple mechanical operations, (iii) most of the functional groups in their structure are of the carboxyl and hydroxyl type, which have a high affinity for metal ions from aqueous solution, and (iv) at least so far, they have quite a few other practical uses [16]
The extraction of alginate from marine red algae biomass (Callithamnion corymbosum sp.) is a simple procedure, which can be easy adapted to concrete experimental conditions
Summary
The industrial development of the recent decades has caused the contamination of many water sources with different types of pollutants around the world. Have examined the behavior of these biosorbents in the processes of metal ion retention from aqueous media, to highlight their applicative potential This widespread use of marine algae biomass as a biosorbent in experimental studies is mainly determined by the following advantages: (i) they are accessible materials almost anywhere in the world, (ii) their preparation requires a small number of simple mechanical operations, (iii) most of the functional groups in their structure are of the carboxyl and hydroxyl type, which have a high affinity for metal ions from aqueous solution, and (iv) at least so far, they have quite a few other practical uses [16]. Alginate extracted from marine red algae biomass (Callithamnion corymbosum sp.) by an adapted alkaline method, was used as biosorbent for the removal of Cu(II), Co(II) and Zn(II) ions from aqueous media The selection of these metal ions was made taking into account the importance and frequency of their use in industrial activities, as well as their consequences on human health. The regeneration efficiency of alginate was examined to provide a complete description of the possible use of this biosorbent in the decontamination of industrial effluent containing metal ions
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