Priority pollutants (Hg2+ and Cd2+) removal from water by ETS-4 titanosilicate

Otero, Marta; Lopes, Cláudia B.; Coimbra, Joana; Ferreira, Tânia; Silva, Carlos M.; Lin, Zhi; Rocha, João; Pereira, Eduarda; Duarte, Armando C.

doi:10.1016/j.desal.2009.04.008

Cited by 35 publications

(17 citation statements)

References 38 publications

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“…The synthesis of ETS-4 was performed according to Lopes et al [1]. Although the production costs of ETS-4 will obviously depend on the scale and amount produced, according with Otero et al [12] at an industrial scale they can be estimated to be 400-600 $ per ton. Table 1 depicts relevant information on ETS-4 titanosilicate.…”

Section: Chemicals and Materialsmentioning

confidence: 99%

Effect of pH and temperature on Hg2+ water decontamination using ETS-4 titanosilicate

Lopes

Otero

Lin

et al. 2010

Journal of Hazardous Materials

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Section: Chemicals and Materialsmentioning

confidence: 99%

Effect of pH and temperature on Hg2+ water decontamination using ETS-4 titanosilicate

Lopes

Otero

Lin

et al. 2010

Journal of Hazardous Materials

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“…Armenante and Kirwan correlation [56] Sh ¼ 2 þ 0:52 Re 0:52 Sc 1=3 (15) dence for the presence of additional impurities or significant changes in the unit cell parameters. Note that some peaks intensity differences were found between the simulated and the experimental diffractograms, which are simply due to the well-known preferential orientation of crystals during these assays.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…The correlation of Armenante and Kirwan [56] (Eq. (15)) was adopted to estimate the convective mass transfer coefficient. The size of our particles is in the range of validity of the correlation: ð6 À 420Þ Â 10 À6 m. The Nelder-Mead algorithm was used to optimize -D As , -D Bs and -D AB , by minimizing the average absolute relative deviation (AARD):…”

Section: Eq (2) Implies That the Ion Exchanger Is Initially In B-formmentioning

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

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“…peat (Viraraghavan and Kapoor 1995), chitosan and its derivatives (Miretzky and Fernandez Cirelli 2009) or inorganic: e.g. dispersed iron oxide, hydrous manganese and tin oxides , Fe oxyhydroxide (FeOOH) and Fe/Mn oxyhydroxides (Kokkinos et al 2014), zeolites (Chojnacki et al 2004), clays (Eloussaief et al 2013;Viraraghavan and Kapoor 1994), pozzolana and yellow tuff (Di Natale et al 2006) and synthetic titanosilicates (Otero et al 2009) or magnetic di-thio functionalized mesoporous silica nanoparticles (Mehdinia et al 2015). Also, a wide array of wastes have been proposed-either used directly or as precursors-as novel low-cost Hg adsorbents (Bhattacharyya et al 2013;Miretzky and Fernandez Cirelli 2009), and these include agricultural (e.g.…”

Section: Introductionmentioning

confidence: 99%

Use of red mud (bauxite residue) for the retention of aqueous inorganic mercury(II)

Rubinos

Barral

2015

Environ Sci Pollut Res

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The effectiveness of the oxide-rich residue from bauxite refining (red mud) to remove inorganic Hg(II) from aqueous solutions was assessed. The aspects studied comprised the kinetics of the process (t = 1 min-24 h), the effect of pH (3.5-11.5), the interacting effect between salt concentration (0.01-1 M NaNO3) and pH and the Hg(II) sorption isotherm. Hg leaching from spent red mud was evaluated using the toxicity characteristics leaching procedure (TCLP) method. The sorption of Hg(II) onto red mud was very fast, with most of Hg(II) (97.0-99.7%) being removed from 0.5-50 μM Hg solutions in few minutes. The kinetic process was best described by Ho's pseudo-second order equation, pointing to chemisorption as the rate controlling step. Hg(II) sorption efficiency was very high (% removal between 93.9 and 99.8%) within all the studied pH range (3.5-11.5) and added Hg concentrations (5 and 50 μM), being optimal at pH 5-8 and decreasing slightly at both lowest and highest pH. The effect of background electrolyte concentration suggests specific sorption as the main interaction mechanism between Hg(II) and red mud, but the increasing non-sorbed Hg concentrations at low and high pH for higher electrolyte concentrations also revealed the contribution of an electrostatic component to the process. The sorption isotherm showed the characteristic shape of high affinity sorbents, and it was better described by the Redlich-Peterson and Freundlich equations, which are models that assume sorbent heterogeneity and involvement of more than one mechanism. The estimated Hg(II) sorption capacity from the Langmuir equation (q m ~9 mmol/kg) was comparable to those of some inorganic commercial sorbents but lower than most bio- or specifically designed sorbents. The leachability of retained Hg(II) from spent red mud (0.02, 0.25 and 2.42 mmol Hg/kg sorbed concentration) was low (0.28, 1.15 and 2.23 μmol/kg, respectively) and accounted for 1.2, 0.5 and 0.1% of previously sorbed Hg, indicating that Hg(II) is tightly bound by red mud once sorbed.

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Priority pollutants (Hg2+ and Cd2+) removal from water by ETS-4 titanosilicate

Cited by 35 publications

References 38 publications

Effect of pH and temperature on Hg2+ water decontamination using ETS-4 titanosilicate

Effect of pH and temperature on Hg2+ water decontamination using ETS-4 titanosilicate

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

Use of red mud (bauxite residue) for the retention of aqueous inorganic mercury(II)

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