Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium

Abstract

-In this work, the biosorption of Cr 3+ and Ni 2+ by Sargassum filipendula pre-treated with CaCl 2 was studied. Kinetic and equilibrium experiments were carried out for mono-and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr 3+ adsorbs slower than Ni 2+ . This behavior was explained by means of a mechanistic analysis, which showed that Cr 3+ uptake presented three adsorption stages, whereas Ni 2+ adsorption presents only two. The mono-component equilibrium data, along with binary kinetic data obtained from mono-component experiments, showed that, although the kinetics for Cr 3+ removal are slower, the biomass had a stronger affinity for this ion. Almost all Ni 2+ is desorbed from the biomass as Cr 3+ adsorbs. The binary equilibrium data also presented this behavior. The binary data was also modeled by using modified forms of the Langmuir, Jain and Snoeyink, and Langmuir-Freundlich isotherms. However, the prediction obtained presented low accuracy. An alternative modeling with artificial neural networks was presented and the results showed that this technique could be a promising tool to represent binary equilibrium data. The main contribution of this work was to obtain experimental data for Cr 3+ /Ni 2+ adsorption, which is a system rarely found in the literature and that provides information that could be used in process modeling and simulation.

STUDY OF BINARY AND SINGLE BIOSORPTION BY THE FLOATING AQUATIC MACROPHYTE Salvinia natans

“…The authors found that, for an initial metal concentration of 10 mg.L -1 , the uptake capacity of the moss, at equilibrium, was the same for both metals (4.8 mg.g , the uptake of Pb (II) was higher than 78%. Seolatto et al (2014) , respectively. In the binary system a strong competitive behavior was observed.…”

Massive Influx of Pelagic Sargassum spp. on the Coasts of the Mexican Caribbean 2014–2020: Challenges and Opportunities

“…Dead algal mass is reported to be more promising than living algae because it has a high metal ion sorption capacity at a high rate, and the adsorbed heavy metal ions present can easily be removed using de-ionized water or desorption agents [106]. There are several works on the use of many species of sargasso as biosorbents, and in the removal of pollutants, such as metal ions (e.g., Hg, Pb, Cu, Cd, Ni, Zn, Fe, and Cr), organic solvents, and organic dyes [107][108][109][110][111][112][113][114][115].…”

Adsorption studies of hexavalent chromium ions on the dead biomass of Cystoseira indica

“…as an efficient biosorbent for the eradication of chromium, cadmium, copper, nickel, zinc, etc. [14]. Previously, Esmaeili and colleagues used activated carbon prepared from red algae Gracilaria and brown algae Sargassum sp.…”