An Easy Determination of the Surface Chemical Properties of Simple and Natural Solids

Davranche, Mélanie; Lacour, Stella; Bordas, François; Bollinger, Jean Claude

doi:10.1021/ed080p76

Cited by 85 publications

(53 citation statements)

References 9 publications

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“…Both the fractional power equation and the Elovich equation were employed to fit these data, with the kinetic parameters acquired from the fitted results being summarized in Table 1. Although the fractional power equation fitted the kinetic data well, it did not provide any mechanistic evidence (Ho and McKay 2002). A change in adsorbent concentration also had a dramatic effect on both the Pb(II) ion adsorption capacity and the adsorption rate (see Figure 6).…”

Section: Adsorption Kineticsmentioning

confidence: 92%

Adsorption of Lead(II) Ions onto Magnetite Nanoparticles

Wang

Zhu

et al. 2010

Adsorption Science & Technology

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ABSTRACT:Magnetite nanoparticles were applied for the removal of lead(II) ions from aqueous solution as a function of pH, contact time, supporting electrolyte concentration and initial analytical Pb(II) ion concentration. The highly crystalline nature of the magnetite structure with pore diameters of ca. 10 nm was characterized by transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The surface area was determined as 115.3 m 2 /g. The surface chemical properties of magnetite in aqueous solution at 25 ºC were investigated.Batch experiments were carried out to determine the adsorption kinetics and adsorption mechanism of Pb(II) ions by the magnetite nanoparticles. The adsorption of Pb(II) ions was mainly governed by surface complexation, with the adsorption process being pH-dependent. In NaCl solutions, Pb(II) ion adsorption increased with increasing ionic strength; however, in NaClO 4 solutions, Pb(II) ion adsorption exhibited little dependence on the ionic strength of the solution.Kinetic studies were performed to understand the mechanistic steps involved in the adsorption process. The adsorption kinetic data for Pb(II) ions were best fitted by the fractional power equation. The Langmuir and Freundlich adsorption isotherms were applicable to the equilibrium adsorption process and the corresponding constants were evaluated. The maximum adsorption capacity (q m ) calculated from the Langmuir isotherm was found to be 0.1105 mmol/g for Pb(II) ions at a pH value of 5.0 and at 25 ºC.

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Section: Adsorption Kineticsmentioning

confidence: 92%

Adsorption of Lead(II) Ions onto Magnetite Nanoparticles

Wang

Zhu

et al. 2010

Adsorption Science & Technology

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“…The pH ZPC corresponds to the zero-point charge pH of solid elements in suspension and was obtained using the potentiometric titration method (Davranche et al, 2003). The titration was carried out with 0.5 M CH 3 COOH and 0.5 M NH 4 OH.…”

Section: Ph Zpcmentioning

confidence: 99%

Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

Vieira

Neto

Silva

et al. 2012

Braz. J. Chem. Eng.

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-Heavy metal removal by adsorption using rice husks as a bioadsorbent was evaluated as an alternative for wastewater treatment. Batch equilibrium experiments and kinetic sorption studies were performed using monocomponent solutions of Ni(II), Cd(II), Zn(II), Pb(II) and Cu(II) in surface samples of in natura (RH) and calcined rice husks (RHA). RHA showed higher potential for removing lead and copper. Experimental data for adsorption isotherms of lead and copper were adjusted by Langmuir, Freundlich and Dubinin-Radushkevick (D-R) models, being better represented by the Langmuir model. The calcination of RH increased its surface area, improving its adsorption properties. From a morphological analysis obtained by SEM and diffraction patterns (XRD), a longitudinal fibrous and amorphous structure was observed for RH. TGA results indicated a total mass loss of around 60% for RH and 24.5% for RHA.

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“…The zero-point load of solid elements in suspension (pH zpc ) was obtained using the potentiometrical titration methodology 16 . The titration was carried out with 0.5 M CH3COOH and 0.5 M NH4OH.…”

Section: Clay Characterizationmentioning

confidence: 99%

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

2011

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Cu (II) removal equilibrium from aqueous solutions using calcined clays "Bofe" and "Verde-lodo" has been studied by batch and fixed-bed in static and dynamic systems, respectively. Analyses were performed for physicochemical characterization of clays using the techniques: X-ray fluorescence (XRF), thermogravimetry (TG), N 2 adsorption (BET) and Cationic Exchange Capacity (CEC). Batch experiments were performed at a constant temperature, adjusting the pH of the solution in contact with clays. Adsorption assays in fixed bed were conducted at the flow rate determined through mass transfer zone (MTZ). Langmuir and Freundlich models were adjusted to equilibrium data. The results of characterization indicated that the temperature of 500 °C is best suited for the calcination of the clays. The maximum adsorption capacity was higher for dynamic system than fixed bed compared to static system, enhancing from 0.0748 to 0.1371 and from 0.0599 to 0.22 mmol.g -1 of clay for "Bofe" and "Verde-lodo", respectively.

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An Easy Determination of the Surface Chemical Properties of Simple and Natural Solids

Cited by 85 publications

References 9 publications

Adsorption of Lead(II) Ions onto Magnetite Nanoparticles

Adsorption of Lead(II) Ions onto Magnetite Nanoparticles

Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

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