Yellow passion-fruit shell as biosorbent to remove Cr(III) and Pb(II) from aqueous solution

Jacques, Rosângela Assis; Lima, Éder C.; Dias, Susana Oliveira; Mazzocato, A. C.; Pavan, Flávio André

doi:10.1016/j.seppur.2007.01.018

Cited by 115 publications

(70 citation statements)

References 38 publications

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“…The multipoint BET (Brunauer, Emmett and Teller) and BJH (Barret, Joyner and Halenda) 17,18 methods were used for surface area and pore calculations. The morphology of the adsorbents was investigated using scanning electron microscopy (SEM), JEOL microscope, model JSM 6060 (Tokio, Japan) 3 and transmission electron microscopy (TEM), JEOL microscope, model JEM 2010 (Tokio, Japan) 14 .…”

Section: Adsorbentsmentioning

confidence: 99%

“…Adsorption studies for the evaluation of the capacity of MWCNT and SWCNT adsorbents for the removal of RB-4 dye from aqueous solutions were carried out in triplicate using a batch contact adsorption method 18 . For these experiments, 30.0 mg of adsorbents were placed in 50 ml flat-bottom Falcon tubes containing 20.0 mL of the dye solution (100.0 to 1000.0 mg L -1 ), which were agitated for an appropriate time (0.0833 to 24.00 h) using an acclimatized shaker (Oxylab, São Leopoldo, Brazil) at temperatures ranging from 298 to 323 K. The pH of the dye solutions varied from 2.0 to 10.0.…”

Section: Adsorption Studiesmentioning

confidence: 99%

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Adsorption of a textile dye from aqueous solutions by carbon nanotubes

et al. 2013

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Multi-walled and single-walled carbon nanotubes were used as adsorbents for the removal of Reactive Blue 4 textile dye from aqueous solutions. The adsorbents were characterised using Raman spectroscopy, N 2 adsorption/desorption isotherms and scanning and transmission electron microscopy. The effects of pH, agitation time and temperature on adsorption capacity were studied. In the acidic pH region, the adsorption of the dye was favourable using both adsorbents. The contact time to obtain equilibrium isotherms at 298-323 K was fixed at 4 hours for both adsorbents. For Reactive Blue 4 dye, Liu isotherm model gave the best fit for the equilibrium data. The maximum sorption capacity for adsorption of the dye occurred at 323 K, attaining values of 502.5 and 567.7 mg g -1 for MWCNT and SWCNT, respectively.

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Section: Adsorbentsmentioning

confidence: 99%

Section: Adsorption Studiesmentioning

confidence: 99%

Adsorption of a textile dye from aqueous solutions by carbon nanotubes

et al. 2013

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“…In order to find out the relation of primary and secondary influencing factors, orthogonal experiment method was used. According to some authors (Xuan et al, 2006;Ho and Ofomaja, 2006;Pavan et al, 2006;Jacques et al, 2007), adsorbent dosage level, temperature and initial Cr(VI) concentration were the main influencing factors. In this study, the influence of the earlier mentioned three factors was studied by taking different concentration of Cr(VI) solution at pH 3 for contact of 90 min with adsorbent dosage level varying from 10 to 60 g/l and initial Cr(VI) concentration varying from 5 to 30 mg/l at different temperatures by orthogonal experiments.…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

“…However, the extensive use of activated carbon for metal removal from industrial effluents is expensive (Babel and Kurniawan, 2003), and limits its large application for wastewater treatment. Therefore, there is a growing interest in finding new alternative low-cost adsorbents for metal removal from aqueous solution, such as: microorganisms Klen et al, 2007), wastes of food industries (Xuan et al, 2006;Ho and Ofomaja, 2006;Pavan et al, 2006;Jacques et al, 2007) and residuals of agricultural products (Brasil et al, 2006;.…”

Section: Introductionmentioning

confidence: 99%

Cr (VI) removal from aqueous solutions by fly ash and fly ash composite filter material: Factorial experimental design

Han¹,

Jing²,

Liu³

2011

Afr. J. Biotechnol.

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The removal of Cr(VI) from aqueous solution by batch adsorption experiments using fly ash (FA) and composite filter material made of fly ash (FACFM) as adsorbents were investigated. The influence of pH, contact time on the selectivity and sensitivity of the removal process were investigated. The effect factors such as adsorbent dosage level, initial Cr(VI) concentration and temperature were studied through orthogonal experiment to investigate their degree of influence on the Cr(VI) adsorption process. Results show that FA and FACFM can be considered as efficient sorbents for the removal of Cr(VI) from aqueous solutions. It was also shown that increase in the adsorbent dosage level led to increase in Cr(VI) adsorption due to the increased number of adsorption sites, the adsorption process was highly pH dependent and the optimum pH was less than 3. Both adsorption rate and the removal ratio of FA were larger than that of FACFM because of its larger contact area and its powdery form, but concerning the intensity and ease of separation from aqueous solution, FACFM was more practical and can be used for wastewater treatment.

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“…Parameters such as pH, contact time, biomass dose, and initial concentration have been studied to establish their effect on the biosorption process. According to numerous authors, the pH is one of the most important parameters affecting the biosorption process [2,[13][14][15]. The pH variation can affect both the configuration of the active ion-exchange sites as well as the ionic state of the sorbate in the solution [16].…”

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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Yellow passion-fruit shell as biosorbent to remove Cr(III) and Pb(II) from aqueous solution

Cited by 115 publications

References 38 publications

Adsorption of a textile dye from aqueous solutions by carbon nanotubes

Adsorption of a textile dye from aqueous solutions by carbon nanotubes

Cr (VI) removal from aqueous solutions by fly ash and fly ash composite filter material: Factorial experimental design

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

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