Thermodynamic aspects of the Pb adsorption using Brazilian sawdust samples: Removal of metal ions from battery industry wastewater

Prado, Alexandre G.S.; Moura, Aline O.; Holanda, Matheus Serra de; Carvalho, Thiago O.; Andrade, Rômulo Davi Albuquerque; Pescara, Igor C.; Oliveira, Augusto H. A. de; Okino, Esmeralda Yoshico Arakaki; Pastore, Tereza Cristina Monteiro; Silva, Douglas J.; Zara, Luiz Fabrício

doi:10.1016/j.cej.2010.03.066

Cited by 25 publications

(4 citation statements)

References 34 publications

(43 reference statements)

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“…From the thermodynamic study, we found a negative value of enthalpy (Δ H = −0.0205 kJ/mol), which represents that the desorption reaction was enthalpically influenced (exothermic in nature) and a positive value of entropy (Δ S = 0.0558 kJ/K mol), suggesting favorable reversible sorption by increasing the randomness of the solid-solution interphase. , If Δ H is negative and Δ S is positive, then the negative value of Δ G at any temperature is expected (always thermodynamically spontaneous and favorable reaction), , which was also found in this study for Be desorption, resulting Δ G values of −16.1, −16.6, −17.2, and −17.8 kJ/mol at the temperature of 288, 298, 308, and 318 K, respectively. Therefore, the desorption process of Be was spontaneous and enthalpically as well as entropically influenced.…”

Section: Resultsmentioning

confidence: 88%

Desorption and Migration Behavior of Beryllium from Contaminated Soils: Insights for Risk-Based Management

et al. 2021

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Factors influencing the desorption, distribution, and vertical migration behavior of Be in contaminated soils are not fully understood. This study examined the desorption and migration of Be in a soil profile from a legacy radioactive waste disposal site using different batch leaching [monofilled waste extraction procedure (MWEP); synthetic precipitation leaching procedure (SPLP); simulated acid rain solution (SARS); and toxicity characteristic leaching procedure] and sequential leaching [community bureau of reference (BCR)] methods for insights relevant to the application of risk-based management. The results showed that Be desorption was higher in the presence of organic than the inorganic leachate composition (MWEP < SPLP < SARS < TCLP < BCR first-step). The desorption followed three diffusion control mechanisms, which resulted in three desorption rate constant estimates of 157, 87.1, and 40.4 Be/kg.h 0.5 , and the estimated desorption maximum was 556 μg/kg. The desorption process was, spontaneous (ΔG > 0), enthalpically and entropically influenced. Increasing the incubation period and heat treatment resulted in a decrease of Be desorption and migration. The soil clay content and pH were the primary factors influencing Be desorption, and the results suggested that Be was desorbed from metal oxyhydroxides and surfaces of silicates (e.g., reactive surfaces of clay minerals), organic matters, and soil pores. Because of high K d values, the mobility of Be was limited, and no exceedances of ecological or human health risk index or guidelines were determined for the current contamination levels at the site. However, Be released from the waste trenches has the ongoing potential to increase Be concentration in the soil.

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Section: Resultsmentioning

confidence: 88%

Desorption and Migration Behavior of Beryllium from Contaminated Soils: Insights for Risk-Based Management

et al. 2021

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“…The retention of heavy metals in soils is determined by their adsorption and desorption capacity at the surface of the particles that make up the soil. These two processes have already been studied with several metals in soils from different parts of the world (Fonseca et al, 2009;Prado et al, 2010;Pokrovsky et al, 2012;Park et al, 2018). The soils differ by the concentration of their components, especially OM, clay minerals, metallic oxides, among others (Momčilović et al, 2011;Pontoni et al, 2016;Qu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Effect of Organic Matter on the Retention of Lead in Perturbed Soils.

Sánchez-Andica

Rengifo

Melo

2021

Preprint

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Four types of soils were prepared with humified matter, bentonite, kaolin and inert matter, in order to control the organic matter (OM) content in the evaluation of retention of lead (II) by adsorption in disturbed soils with the possibility of being contaminated. The results indicated that retention capacity of Pb+2 increases as organic matter increases, however, this retention is not proportional to the organic matter increment. An increase of 10 units in the concentration of the background solution results in a decrease in the retention capacity of 50%. The outcomes also indicated that lead (II) adsorption is successfully explained by the Langmuir model and the adsorption kinetics fitted well to the Ho pseudo second order model. The thermodynamic values of the Gibbs free energy indicated that it was a spontaneous process and the energy of the process suggests a retention mechanism by ion exchange. A soil with high content of organic matter does not guarantee high retention of lead, even more so when the adsorption mechanism is given by ion exchange.

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“…Disadvantages of the conventional methods of wastewater treatment (ion exchange, precipitation, ultrafiltration, electrochemical processes, etc.) have been reported [2], as well as the benefits of heavy metal sorption on different sorbents. The other advantage of biosorption is using easily available and waste biomass as a sorbent.…”

Section: Introductionmentioning

confidence: 99%

Sorption Kinetics Of Cd(II) Ions On Fermented Grape Marc

Grudić

Bošković

Jaćimović

2017

Environ. Protect. Eng.

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The sorption kinetics of Cd(II) ions on the biosorbent which is waste in wine production has been investigated. The sorption process took place relatively quickly, enabling one to achieve equilibrium within a period of 15-20 min only, depending on initial concentration of the sorbate. Kinetic models of pseudo-first and pseudo-second order, model of diffusion in a fluid film and Weber's and Morris' intraparticle diffusion model were used to describe the experimental results. The pseudo-second order kinetic model described the sorption process with a high correlation coefficient (R 2 = 0.998) better than the other kinetic models. The mass transfer coefficient decreases upon increasing the initial concentration of the solution, which can be explained by the fact that the mechanism of binding of Cd(II) ions to the surface of the sorbent is ion exchange followed by discharge of exchangeable cations from the surface. Characteristic constants in the Weber-Morris model increase upon increasing the initial concentration of the solution.

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Thermodynamic aspects of the Pb adsorption using Brazilian sawdust samples: Removal of metal ions from battery industry wastewater

Cited by 25 publications

References 34 publications

Desorption and Migration Behavior of Beryllium from Contaminated Soils: Insights for Risk-Based Management

Desorption and Migration Behavior of Beryllium from Contaminated Soils: Insights for Risk-Based Management

Assessment of the Effect of Organic Matter on the Retention of Lead in Perturbed Soils.

Sorption Kinetics Of Cd(II) Ions On Fermented Grape Marc

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