Biosorption of Cr(III) using in natura and chemically treated tropical peats

Batista, Ana Paula dos Santos; Romão, Luciane Pimenta Cruz; Arguelho, Maria Lara P.M.; Garcia, Carlos Alexandre Borges; Alves, José do Patrocínio Hora; Passos, Elisangela Andrade; Rosa, André Henrique

doi:10.1016/j.jhazmat.2008.06.129

Cited by 65 publications

(37 citation statements)

References 28 publications

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“…19,29 The activated carbon obtained from WGT biomass after H 3 PO 4 and H 2 SO 4 treatments provided better results for the adsorption efficiency that increases from 89 (for untreated biomass) to 94, and 95%, respectively ( Figure 6), results that are in good agreement with other from the literature. 16,50 In the case of alkali treatment such as NaOH, the increasing of adsorption efficiency can be explained by the fact that after treatment, hydrolysis reactions can occur, causing high dissolution of organic substances from the biomass. 43 The hydrolysis reactions can lead to the formation of more hydroxylic (HO -) and carboxylate (COO -) groups in the treated biomass, which enhance the cationic adsorption.…”

Section: The Effect Of Chemical Treatments Of Wgt Biomass Onto Mg mentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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The adsorption of malachite green (MG) from aqueous solution by waste green tea (WGT) biomass was investigated. A series of experiments in batch conditions were conducted in order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum removal efficiency for untreated WGT was 89% (4 g biomass, 100 mL solution of 94 mg/L, 316 K). It was found that the adsorption of MG increased by increasing temperature from 296 to 316 K. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) were calculated, and indicated that dye adsorption onto the studied biomass was endothermic and non-spontaneous. Six chemical treatments were tested (four acidic -H 3 PO 4 , H 2 SO 4 , HCl, and tartaric acid, one oxidant -H 2 O 2 , and one basic -NaOH) in order to study the chemical groups responsible for MG adsorption onto WGT biomass. The alkali and acidic treatments led to an increase of adsorption efficiency up to 92% and 95% (H 2 SO 4 ) respectively. The FTIR spectroscopy results emphasized the modifications of the biomass surface and how these are influencing the adsorption process.

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Section: The Effect Of Chemical Treatments Of Wgt Biomass Onto Mg mentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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“…O comportamento observado contradiz os resultados de Anwar et al (2009) e Tito & Chaves (2009, pois à medida que o pH foi elevado, não se observou aumento da sorção. Segundo Batista et al (2009), a maior sorção em pH ácido pode ser justificada pela presença de matéria orgânica.…”

Section: Resultsunclassified

Sorção competitiva entre cádmio e cromo em Latossolo variando pH e eletrólito de suporte

Lemke-de-Castro

Borges

Leandro

2015

Agraria

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RESUMOO uso de resíduos industriais, lodos e compostos em áreas agrícolas é bastante utilizado no Brasil, podendo esses resíduos adicionar metais tóxicos aos solos. Objetivou-se determinar a sorção competitiva entre os metais Cd 2+ e Cr 3+ no horizonte sub-superficial de um Latossolo Vermelho Acriférrico típico, variando as condições de pH e presença ou ausência de eletrólito de suporte. ) with an alkaline pH. Were added in 5.0 mL of soil, 50.0 mL of solution containing the toxic metal, with different concentrations, within the limits established in CONAMA Resolution 420/09. Set up the Freundlich sorption isotherms in the linear model. They were made adjustments polynomial regression between the concentrations of the levels of metals in solution by contaminant concentration in the filtered solution after equilibration. Correlation analysis was performed between the retardation factor (R) and oxides content and pH. The metal was preferentially sorbed Cr 3+ . The presence of supporting electrolyte and pH variation did not affect the sorption of Cd 2+ and competitive Cr 3+ .

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“…is the equilibrium constant related to the energy of sorption, which quantitatively reflects the affinity between the sorbent and sorbate [9].…”

Section: Equilibrium Modellingmentioning

confidence: 99%

“…It is thought to be an essential nutrient required for sugar and fat metabolism in organisms [9]. However, prolonged contact causes skin allergies and cancer.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Cr(III) and Pb(II) by Schoenoplectus californicus and Insights into the Binding Mechanism

Rearte

Bozzano

Andrade

et al. 2013

ISRN Chemical Engineering

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Biosorption and desorption of chromium and lead on shoots biomass of Schoenoplectus californicus were investigated by performing batch sorption tests in different conditions of pH, biosorbent dose, and initial concentration in simple and binary solutions. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were employed to describe sorption equilibrium. Filters and biomass were characterized before and after treatments by environmental scanning electron microscopy and X-ray energy-dispersive spectrometry. The optimal conditions for biosorption were found to be pH 5 for both metals. The contact time to reach pseudoequilibrium changed as a function of pH and the metal studied. The highest optimisation of biosorbent dose was 5 g L −1 at pH 7 and 15 g L −1 at pH 5 for both metals. The most effective extracting agents for lead and chromium proved to be HNO 3 and NaOH, respectively. The recovery of lead was greater than of chromium because the Cr(III) sorption mechanisms involve a stronger binding energy than the mechanisms for Pb(II), such as in intern sphere complexes. Both metals accounted for a high % removal (>90%) under the best sorption conditions. The use of Schoenoplectus californicus proved to be an efficient and economical alternative for the treatment of effluents contaminated with lead and chromium.

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Biosorption of Cr(III) using in natura and chemically treated tropical peats

Cited by 65 publications

References 28 publications

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Sorção competitiva entre cádmio e cromo em Latossolo variando pH e eletrólito de suporte

Biosorption of Cr(III) and Pb(II) by Schoenoplectus californicus and Insights into the Binding Mechanism

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