Biosorption of Trivalent Chromium from Aqueous Solution by Red Seaweed Polysiphonia nigrescens

Abstract

This paper presents the biosorption of chromium onto red seaweed (Polysiphonia nigrescens). Batch mode experiments were performed to determine experimental parameters affecting sorption process such as pH, contact time, initial metal ion concentration and biomass dosage. The Cr(III) sorption was dependent on pH and adsorbent dosage. The adsorption kinetic data could be fitted with a pseudo-second-order model and the equilibrium data with a Langmuir model. The maximum sorption capacity was of 16.11 mg/g at pH 4 and 10 g/L of biomass dosage. 0.1 M H2SO4 showed good desorption efficiency (>80%). Spectroscopy analysis showed that Cr(III) sorption on seaweed was mainly through the ion-exchange mechanism. This report indicates that P. nigrescens is an effective and economical sorbent for removal of Cr(III) from wastewaters

Removal of heavy metal ions from drinking water by alginate-immobilised Chlorella sorokiniana

“…The Langmuir, Freundlich, Dubinin-Radushkevich and Redlich-Peterson sorption isotherm models (Blanes et al 2011;Dubinin 1960;Foo and Hameed 2010;Freundlich 1926;Langmuir 1916) were used for modelling equilibrium data obtained from the biosorptions of Cu 2? , Ni 2?…”

“…8) incorporates the features of the Langmuir and Freundlich isotherms into a single equation. Thus, this model is capable of representing adsorption equilibrium over a wide concentration range and can be applied either in homogeneous or heterogeneous systems because of its flexibility (Blanes et al 2011;Foo and Hameed 2010).…”

“…3), giving information about the biosorption mechanism, i.e. type of biosorption (Aksu 2002;Blanes et al 2011;Sarı and Tuzen 2009):…”

“…The sorption capacities of metals by alginate-immobilised algae increased up to 37.85, 19.34 Table 1 The isotherm and kinetics models used in modelling the sorption data (Blanes et al 2011;Dubinin 1960;Foo and Hameed 2010;Freundlich 1926;McKay 1998, 1999;Lagergren 1898;Langmuir 1916 …”

Application of immobilized microalgae for native wastewater treatment

“…Также отмечена биоабсорбция Phaeophyta. В их клеточных стенках присутствует альгинат, имеющий в функциональных группах карбоновые кислоты, такие как глюроновая и маннороновая (Mahmoud, Mohamed, 2017), способные связывать металлы с помощью сложных электростатических взаимодействий (Haug, 1961;Papageorgiou et al, 2006;Patricia Blanes et al, 2011).…”