Biosorption of chromium(III) by Sargassum sp. biomass

Cossich, Eneida Sala; C.R.G., Tavares; T.M.K., Ravagnani

doi:10.2225/vol5-issue2-fulltext-4

Cited by 59 publications

(61 citation statements)

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“…Effects of metal concentration on adsorption are presented in Figure 1. Obtained trend is consistent with previous results in the literatures [20,[22][23][24][25][26][27][28].These authors all reported increased adsorption with increasing metal ion concentration. Freundlich and Langmuir isotherm models were used to adjust experimental data (Table 3).…”

Section: Resultssupporting

confidence: 92%

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Sorption of Heavy Metal Ions (Cu2+ and Cd2+) From Simulated and Industrial Wastewaters Using Sugarcane Biomass

Opeolu

Fatoki

2017

Eco-Tech

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The widespread use of heavy metals in different manufacturing processes has resulted in their presence in the air, soil and aquatic ecosystems. Many manufacturing processes release their effluents into nearby streams and rivers due to non-availability of waste treatment technologies in the developing world. Industrialization has therefore been reported to be a major anthropogenic source of these elements and their compounds waterbodies. Conventional methods that are currently being used in the developed world (such as chemical precipitation, ultra-filtration, reverse osmosis, etc) are expensive and so, unaffordable to small-scale businesses prevalent in developing economies. The need for alternative, cheaper and available technologies therefore, cannot be over-emphasized. This study attempted to remove heavy metals (Cu 2+ and Cd 2+ ) from simulated and industrial (paint and textile) wastewaters using sugarcane biomass. A synthetic resin (Chelex) was used as control. Batch sorption experiments were conducted to assess the influence of contact time, adsorbent dose, adsorbate concentration, pH, agitation speed, temperature and particle size. Increases in the parameters (except particle size) gave corresponding increases in percentage adsorption of both metals. Optimal temperature for adsorption was achieved at 50 o C above which adsorption declined considerably. Experimental data for Cu 2+ and Cd 2+ fitted well into freundlich and langmuir isotherms. In textile effluent, 100% adsorption was achieved for both metals using sugarcane biomass in contrast to 89% and 91% for Cu 2+ and Cd 2+ respectively in chelex, a synthetic resin. Similarly, adsorption was 100% for both metals using the biosorbent. Sugarcane biomass may therefore be utilized for water and wastewater remediation in the developing world. Its biodegradability gives comparative advantage over alternative synthetic and expensive resins since its disposal will be more environmentally friendly.

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Section: Resultssupporting

confidence: 92%

“…Freundlich and Langmuir isotherm models were used to adjust experimental data (Table 3). The Freundlich model considers the existence of a multilayered structure [26]. Values of K f and n, determined from the slope of Freundlich plots were about unity, and this suggests favourable adsorption for the biomass.…”

Section: Resultsmentioning

confidence: 98%

Sorption of Heavy Metal Ions (Cu2+ and Cd2+) From Simulated and Industrial Wastewaters Using Sugarcane Biomass

Opeolu

Fatoki

2017

Eco-Tech

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“…The main gamma-emitters in the coolant with operating nuclear reactors are radionuclides of lead: Pb generated because of threshold nuclear reactions. Lead-204m is of practical importance with activity level (1-2) ×10 7 Bq/cm 3 and to remove it from waste water [8]. Various treatment techniques have been employed to treat wastewater, such as chemical precipitation, ion exchange, reverse osmosis, electrodialysis, ultrafiltration, nanofiltration, coagulation, flocculation, and floatation, etc.…”

Section: Introductionmentioning

confidence: 99%

Low cost natural adsorbent for removal of Pb(II) ions from waste solutions

Abdel-Galil

Rizk

El-Kenany

2018

Arab Journal of Nuclear Sciences and Applications

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In this paper, the adsorption behavior of Pb 2+ ions from aqueous solutions onto castor stem as a natural adsorbent was investigated under various experimental conditions. Characterization of castor sorbent was evaluated by SEM, XRD, FTIR, TGA, BET surface area analysis, and CHNS elemental analyses. Operational parameters such as pH, contact time, initial ion concentrations, sorbent amount, particle size, competing ions, and temperature were also studied. Adsorption data fitted well with the Langmuir and Freundlich models. However, Freundlich isotherm displayed a better fitting model than Langmuir isotherm because of the higher correlation coefficient that the former exhibited, thus, indicating the applicability of multilayer coverage of the Pb (II) on the surface of adsorbent. On the basis of distribution studies, the distribution coefficient (K d ) increases with increasing the reaction temperature of the solution. Thermodynamic parameters, ∆H o , ∆G o , and ∆S o were calculated and indicated an endothermic and spontaneous process.

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“…Adsorption, ion exchange, precipitation and complexation with organic matter are mechanisms that limit the amount of metal leaching through surface water or groundwater (Cossich et Al., 2002).…”

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confidence: 99%