Aqueous speciation of sulfuric acid–cupric sulfate solutions

Casas, J. Manuel; Álvarez, F.; Cifuentes, Luis Fernández

doi:10.1016/s0009-2509(00)00421-8

Cited by 109 publications

(79 citation statements)

References 13 publications

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“…The decrease in biosorption capacity between 27 and 62°C may be due to the damage of active sites in the yeast. Many other researchers have also observed the same results [20,21]. increase in time at constant temperature.…”

Section: Effect Of Temperaturesupporting

confidence: 72%

Biosorption of heavy metals from aqueous solutions by Saccharomyces Cerevisiae

2015

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The present work evaluates the performance of the yeast Saccharomyces Cerevisiae to remove heavy metals from aqueous solutions. The effect of pH, temperature, initial concentration, contact time, and biosorbent dosage on biosorption capacity is studied. Experiment results show that metal uptake is a rapid process at pH values (5.0-6.0), and the order of accumulated metal ions isThe biosorption process obeys Freundlich and the Langmuir adsorption isotherms. The kinetics of metal ions biosorption could be described by Lagergren and Ho models. Nitric acid with low concentration of 0.05 N is effective in desorbing the biosorbed metal ions. Sodium hydroxide solution of 0.2 M is effective in regenerating the yeast; the regenerated yeast could be used for at least six cycles of biosorption, without losing its metal removal capacity. Carboxyl, amine, and phosphate groups present in the yeast were found to be the main biosorption sites for metal ions.

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Section: Effect Of Temperaturesupporting

confidence: 72%

Biosorption of heavy metals from aqueous solutions by Saccharomyces Cerevisiae

2015

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“…The diffusion coefficient for protons in sulfuric acid is estimated to be roughly four times that of bisulfate ions at 20.5 °C in the same medium, namely, 4. (13).…”

Section: Carbon Additionsmentioning

confidence: 99%

Partial State-of-Charge Duty: A Challenge but Not a Show-Stopper for Lead-Acid Batteries!

Moseley

Rand

2012

ECS Trans.

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The mechanism by which conventional lead-acid batteries (both flooded and valve-regulated designs) fail when subjected to highrate partial-state-of-charge (HRPSoC) operation in hybrid electric vehicles is manifested as poor dynamic charge acceptance at the negative plate. This parameter is defined as the amount of charge that is actually delivered to the battery during regenerative braking phases of a driving cycle, divided by the amount of charge that

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“…The medium pH affects the solubility of metals and the ionization state of functional groups [4,19,20] present in the biosorbent (crab shell). Experiments for Nickel (II) sorption were carried out at different pH values ranging from 2-6.5 (Fig.…”

Section: Effect Of Phmentioning

confidence: 99%

Optimization of process variables for a biosorption of nickel(II) using response surface method

Murugesan

Rajiv

Murugesan

2009

Korean J. Chem. Eng.

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The biosorption of nickel(II) was studied by using crab shell particles of diameter (d p =0.012 mm) under different initial concentrations of nickel(II) in solution (0.01-5.0 g/l), temperature (20-40 o C), pH (2-6.5), and biosorbent dosages (0.5-10 g/l). The maximum removal of nickel(II) occurred at pH 6.5 and temperature 40 o C for a biosorbent dosage of 6 g/l. The results were modeled by response surface methodology (RSM), which determines the maximum biosorption of nickel(II) as a function of the above four independent variables, and the optimum values for the efficient biosorption of nickel(II) were obtained. The RSM studies were carried out using Box-Behnken design and the analysis of variance confirms the adequacy of the quadratic model with coefficient of correlation R 2 to be 0.9999. The quadratic model fitted the data well with Prob>F to be <0.0001, indicating the applicability of the present proposed model.

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Aqueous speciation of sulfuric acid–cupric sulfate solutions

Cited by 109 publications

References 13 publications

Biosorption of heavy metals from aqueous solutions by Saccharomyces Cerevisiae

Biosorption of heavy metals from aqueous solutions by Saccharomyces Cerevisiae

Partial State-of-Charge Duty: A Challenge but Not a Show-Stopper for Lead-Acid Batteries!

Optimization of process variables for a biosorption of nickel(II) using response surface method

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