Samarium(III) and praseodymium(III) biosorption on Sargassum sp.: Batch study

Oliveira, Roberto Carlos de; Jouannin, Claire; Guibal, Eric; Garcia, Oswaldo

doi:10.1016/j.procbio.2010.11.021

Cited by 65 publications

(32 citation statements)

References 32 publications

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“…The extraction of metals from these leachates or waste streams can be processed by precipitation (Rabatho et al 2013), solvent extraction (Abreu and Morais 2014;Tunsu et al 2014;Vander Hoogerstraete and Binnemans 2014;Xie et al 2014), ion exchange and chelating resins (Abdel-Rahman Adel et al 2010; Barron et al 2008;Lokshin et al 2013;Xiong and Zheng 2010), extractant-impregnated resins (Lee et al 2010) and biosorption (Das and Das 2013;Hosomomi et al 2013;Oliveira et al 2012Oliveira et al , 2011Wu et al 2011). The selection of the appropriate process depends on the composition of the effluents (i.e., metal concentration, metal speciation, presence of competitor ions) and may face some critical problems: the production of huge amounts of contaminated sludge, difficulty to reach target discharge levels (precipitation) and economic limitations (poor competiveness of solvent extraction at low metal concentration; cost of sophisticated resins).…”

Section: Introductionmentioning

confidence: 99%

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

et al. 2015

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The recovery of three rare earth (RE) metals ions [Yb(III), Dy(III) and Nd(III), belonging to heavy, mild and light REs, respectively] was investigated using hybrid chitosan-magnetic nano-based particles functionalized by diethylenetriamine (DETA). The effect of pH on sorption performance was analyzed: the optimum initial pH value was found close to 5 (equilibrium pH value close to 6.5). The nanometric size of sorbent particles (30-50 nm) minimized the contribution of resistance to intraparticle diffusion on the control of uptake kinetics, which is efficiently modeled using the pseudo-second order rate equation: under selected experimental conditions the contact time required for reaching equilibrium was less than 1 h. Sorption isotherms were efficiently modeled using the Langmuir equation: maximum sorption capacities reached about 50 mg metal g -1 , regardless of the RE. The temperature had a very limited effect on sorption capacity (in the range 300-320 K). The thermodynamic parameters were determined: the sorption was endothermic (positive values of DH°), spontaneous (negative values of DG°) and contributed to increasing the disorder of the system (positive values of DS°). The three REs have similar sorption properties on DETA-functionalized chitosan magnetic nano-based particles: the selective separation of these elements seems to be difficult. The sorbed metal ions can be removed from loaded sorbents using thiourea, and the sorbent can be recycled for at least five sorption/desorption cycles with a limited loss in sorption performance (by less than 6 %). The saturation magnetization was close to 20 emu g -1 ; this means that nano-based superparamagnetic particles can be readily recovered by an external magnetic field, making the processing of these materials easy.

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Section: Introductionmentioning

confidence: 99%

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

et al. 2015

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“…Palmieri et al (2002), por exemplo, observaram q máx de 0,73 mmol/g para a biossorção de La por Sargassum sp. Oliveira et al (2011), por sua vez, observaram valores de q máx de 0,65 e 0,71 mmol/g para a biossorção de samário (Sm) e praseodímio (Pr), respectivamente, pela mesma espécie de alga marrom. O q máx de 1,03 mmol/g foi observado para a biossorção de La pela alga verde Chlamydomonas reinhardtii (Birungi & Chirwa, 2014).…”

Section: Isotermas De Adsorçãounclassified

Uso De Biomassa De Microalga Para Biossorção De Lantanídeos

Heidelmann

Roldão

Egler

et al. 2017

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RESUMOAs algas e microalgas vêm sendo estudadas quanto à sua habilidade em biossorver elementos de terras--raras através da troca iônica com grupos ligantes presentes na superfície dos revestimentos celulares. Assim, o presente trabalho buscou avaliar a capacidade da biomassa liofilizada da microalga Chlorella vulgaris (Chlorophyta) na biossorção do lantânio--La, visando seu uso na separação de terras--raras. Os ensaios de biossorção de La foram conduzidos em batelada, onde suas concentrações residuais foram determinadas com o uso de ICP--OES. Constatou--se que a biossorção de espécies iônicas de La foi dependente do pH inicial de cada ensaio. A capacidade de biossorção foi maior em valores de pH mais baixos. Uma vez que o ponto de carga zero foi determinado em valor de pH 5,59, pode--se concluir que espécies aniônicas de La estejam presentes em solução. Os valores de q máx revelam a capacidade de biossorção de espécies iônicas de La pela biomassa de C. vulgaris, a qual apresentou um valor de 1,11 mg/g (0,8 mmol/g). As isotermas demonstraram que, nas condições experimentais avaliadas, a biossorção de La ocorre de acordo com o modelo proposto por Freundlich, em um processo de adsorção reversível em sistema heterogêneo. PALAVRAS--CHAVE: Chlorella vulgaris, biossorção, terras--raras, lantânio MICROALGAE BIOMASS USE FOR LANTANIDES BIOSORPTION ABSTRACTSome algae and microalgae have been studied for their ability to biosorb rare earth elements through ion exchange with binder groups present on the cellular surface coatings. Thus, the present work evaluated the capacity of lyophilized biomass of the microalgae Chlorella vulgaris (Chlorophyta) in lanthanum--La biosorption, aiming its use in the separation of rare earths. The biosorption assays were conducted in batch and their residual concentrations were determined using ICP--OES. It was found that the biosorption of ionic species depended on the initial pH of each assay. The biosorption capacity was higher at lower pH values. Since the zero charge point was determined in pH value of 5.59, the conclusion is that anionic species of La are present in solution. The values of qmax reveal the biosorption capacity of the ionic species of La by the biomass of C. vulgaris, which presented a value of 1.11 mg/g (0.8 mmol/g). The isotherms showed that, under the experimental conditions evaluated, the biosorption of La occurs according to the model proposed by Freundlich, in a process of reversible adsorption in a heterogeneous system.

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“…For instance, on biosorption of Sm(III) and Pr(III) by Sargassum sp. biomass described by Oliveira et al (2011), the Langmuir adsorption model has been founded very accurate, that is approximated for liquid-solid equilibrium by the Eq. (2) and it can be observed in the Fig.…”

Section: Biosorption Isothermsmentioning

confidence: 99%