Analysis of the removal of lead(II) from aqueous solutions by adsorption onto insolubilized humic acid: temperature and pH dependence

Baker, Hutaf M.; Khalili, Fawwaz I.

doi:10.1016/j.aca.2004.03.068

Cited by 73 publications

(31 citation statements)

References 42 publications

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“…It is seen that there is almost no adsorption between pH (1-2) range. In the literature [5,8] it is also emphasized that in aqueous media there is a competition between H 3 O + and metal ions toward the solid phase. At low pHs, the surface of the adsorbent is closely associated with the hydronium ions and repulsive forces limit the approach of the metal ions.…”

Section: Effect Of Ph Upon Cation Sorptionmentioning

confidence: 99%

“…n liquid (8) where [C] solid is the amount of ionic species adsorbed on the solid matrix at equilibrium (mmol/g), [C] liquid is the concentration of the cation in solution at equilibrium (mmol/ml), k and n, are Freundlich constants. This expression can be linearized as…”

Section: Freundlich Isothermmentioning

confidence: 99%

“…Gezici et al [5] reported the sorption behavior of a nickel-insolubilized humic acid system in a column arrangement. In another study Baker and Khalili [8] examined the analysis of the removal of lead(II) from aqueous solutions by adsorption onto insolubilized humic acid. ElEswed and Khalili [9] reported the adsorption of Cu(II) and Ni(II) on solid humic acid.…”

Section: Introductionmentioning

confidence: 99%

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Sorption of radioactive cesium and barium ions onto solid humic acid

Celebi

Kilikli

Erten

2009

Journal of Hazardous Materials

103

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a b s t r a c tIn this study, the sorption behavior of two important fission product radionuclides ( 137 Cs and 140 Ba) onto sodium form of insolubilized humic acid (INaA) were investigated as a function of time, cation concentration and temperature, utilizing the radiotracer method. The sorption processes are well described by both Freundlich and Dubinin-Radushkevich type isotherms. Thermodynamic constants such as; free energy ( G ads ), enthalpy ( H ads ), entropy ( S ads ) of adsorption were determined. It was found that Ba 2+ was adsorbed five times more than Cs + onto structurally modified humic acid and kinetic studies indicated that adsorption behavior of both ions obey the pseudo second order rate law. The effect of pH change on sorption was also examined. FTIR and solid-state carbon NMR ( 13 CNMR) spectroscopic techniques were used to understand the structural changes during insolubilization process. Quantitative determination of adsorption sites was carried out using potantiometric titration.

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Section: Effect Of Ph Upon Cation Sorptionmentioning

confidence: 99%

Section: Freundlich Isothermmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sorption of radioactive cesium and barium ions onto solid humic acid

Celebi

Kilikli

Erten

2009

Journal of Hazardous Materials

103

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“…As HA has strong chelating capacity with metals and obvious adsorption capacity on organic compounds, it cannot be used as an adsorbent due to its high solubility in chelating formation [19] . However, some researchers have studied the adsorption effects of Polluted Water insolubilized humic acid on metals and organic contaminants [20][21] . Insolubilized humic acid (IHA) is a material that is insoluble in aqueous media even at alkaline conditions, and is obtained through a process developed by Seki and Suzuki [21] .…”

Section: Introductionmentioning

confidence: 99%

Characterization and Adsorption Mechanism of Pb (II) Removal by Insolubilized Humic Acid in Polluted Water

Ma¹,

Wei

Zhao³

et al. 2014

IJEPP

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Abstract:The removal of Pb 2+ in the aqueous solutions by adsorption onto insolubilized humic acid (IHA) is investigated. The equilibrium isotherms were determined at pH 3.5 under constant ionic strength and at different temperatures. At the same time, the paper has also analyzed the adsorption experimental data by using three different isotherm models: Langmuir, Frendlich and Linear isotherm. As the result, it has obtained the optimal correlation for Frendlich isotherm equations. In addition, the paper has calculated the thermodynamic quantities ∆H in accordance with the Clausius-Claperyon , s theory. It means that the type of adsorption of Pb 2+ onto IHA is physisorption, rather than by chemical bonding. And finally, the adsorption equilibrium gained around 12 hours and a high and stable removal of heavy metals on insoluble humic acid has been obtained almost under the neutral conditions.

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“…Other authors' experimental pH conditions were similar to bromide [17][18][19][20]. However, very few studies have investigated preparation of complexes in an alkaline environment.…”

mentioning

confidence: 99%