Metal Recovery, Separation and/or Pre-concentration

Lopes, Cláudia B.; Lito, Patrícia F.; Cardoso, Simão P.; Pereira, Eduarda; Duarte, Armando C.; Silva, Carlos M.

doi:10.1007/978-94-007-4026-6_11

Cited by 17 publications

(14 citation statements)

References 228 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Major anthropogenic sources of mercury are effluents from chloralkali, pulp and paper, petroleum refining, and electric batteries and lamp production [3]. Technologies, such as membrane processes, chemical precipitation, flotation, coagulation–flocculation, and electrochemical techniques reduce metal content present in waters in a range of concentrations of mg dm −3 [4,5]. However, these conventional methods may be inadequate, expensive and generate secondary sludge, and most of the times are not effective to reach final low levels [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage

Fabre

Vale

Pereira

et al. 2019

IJMS

Self Cite

View full text Add to dashboard Cite

Different experimental conditions were tested in order to optimize the Hg(II) removal by Eucalyptus globulus bark. Response surface methodology was applied to extract information about the significance of the factors and to obtain a model describing the sorption. The results were generated through the design of experiments by applying the methodology of a three-factor and three-level Box–Behnken design. The factors tested were pH (4.0, 6.5, and 9.0), salinity (0, 15, and 30), and biosorbent dosage (0.2, 0.5, and 0.8 g dm−3) to evaluate the Hg(II) removal using realistic conditions, such as contaminated natural waters with an initial Hg(II) concentration of 50 µg dm−3. The optimum response provided by the model was 81% of the metal removal under the optimal operating conditions: a pH value of 6.0, no salinity, and a biosorbent dosage of 0.55 g dm−3. Concerning the kinetic, the pseudo-second-order equation fitted better to the experimental results with R2 between 0.973 and 0.996. This work highlights the promising valorization of this biomass, which is an industrial byproduct and makes available information about the influence of the variables for Hg(II) removal in water treatment processes.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage

Fabre

Vale

Pereira

et al. 2019

IJMS

Self Cite

View full text Add to dashboard Cite

show abstract

“…When dealing with the requirement of high purity water for several applications and water/wastewater remediation in general, ion exchange may be recommended [6][7][8]. It is well known in the nuclear industry field [2,6,7,9,10] as, for example, in the separation of zirconium and hafnium [9] (the former is essentially transparent to free neutrons while the latter is a very strong absorber of neutrons used in reactor control rods).…”

Section: Introductionmentioning

confidence: 98%

“…It is well known in the nuclear industry field [2,6,7,9,10] as, for example, in the separation of zirconium and hafnium [9] (the former is essentially transparent to free neutrons while the latter is a very strong absorber of neutrons used in reactor control rods).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cs+ ion exchange over lanthanide silicate Eu-AV-20: Experimental measurement and modelling

Figueiredo

Ananias

Rocha

et al. 2015

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

“…Heavy metals are considered traditional water contaminants. As a result of many applications in industrial, construction and agricultural sectors, there is inevitably some loss and dispersion of metals back into the environment [1]. In addition to the so-called anthropogenic sources, metal releases can also be of natural origin, like rocks and soil erosion, emissions from volcanoes, and atmospheric deposition [1].…”

Section: Introductionmentioning

confidence: 99%

Mercury Removal from Aqueous Solution Using ETS-4 in the Presence of Cations of Distinct Sizes

et al. 2020

Self Cite

View full text Add to dashboard Cite

The removal of the hazardous Hg2+ from aqueous solutions was studied by ion exchange using titanosilicate in sodium form (Na-ETS-4). Isothermal batch experiments at fixed pH were performed to measure equilibrium and kinetic data, considering two very distinct situations to assess the influence of competition effects: (i) the counter ions initially in solution are Na+ and Hg2+ (both are exchangeable); (ii) the initial counter ions in solution are tetrapropylammonium (TPA+) and Hg2+ (only Hg2+ is exchangeable, since TPA+ is larger than the ETS-4 micropores). The results confirmed that ETS-4 is highly selective for Hg2+, with more than 90% of the mercury being exchanged from the fluid phase. The final equilibrium attained under the presence of TPA+ or Na+ in solution was very similar, however, the Hg2+/Na+/ETS-4 system in the presence of Na+ required more 100 h to reach equilibrium than in the presence of TPA+. The Hg2+/Na+/ETS-4 system was modelled and analyzed in terms of equilibrium (mass action law) and mass transfer (Maxwell–Stefan (MS) formalism). Concerning equilibrium, no major deviations from ideality were found in the range of studied concentrations. On the other hand, the MS based model described successfully (average deviation of 5.81%) all kinetic curves of mercury removal.

show abstract

Metal Recovery, Separation and/or Pre-concentration

Cited by 17 publications

References 228 publications

Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage

Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage

Cs+ ion exchange over lanthanide silicate Eu-AV-20: Experimental measurement and modelling

Mercury Removal from Aqueous Solution Using ETS-4 in the Presence of Cations of Distinct Sizes

Contact Info

Product

Resources

About