Cadmium adsorption and desorption behaviour on goethite at low equilibrium concentrations: effects of pH and index cations

Mustafa, Ghulam; Singh, Balwant; Kookana, Rai S.

doi:10.1016/j.chemosphere.2004.08.087

Cited by 101 publications

(48 citation statements)

References 40 publications

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“…Numerous studies have shown that solution pH can significantly affect the adsorption of ions on (oxyhydr)oxides (Mustafa et al, 2004;Mallet et al, 2013). A strong pH dependence of phosphate and Zn(II) adsorption on Fh was observed as well in this work (Fig.…”

Section: Effects Of Ph On the Adsorption Of Phosphate And Zn(ii)supporting

confidence: 61%

“…Due to its extremely large surface area and chemically active surface groups, Fh shows strong capacity in the adsorption of heavy-metal cations and oxyanions and therefore has a close relationship with the geochemical cycling of these contaminants (Jambor and Dutrizac, 1998;Moon and Peacock, 2013). Furthermore, its abundance in the environment as well as easy availability and small toxicity also make it an excellent candidate in contaminant removal strategies (Hiemstra et al, 2009 interactions of Fh with heavy-metal cations and oxyanions have drawn significant concerns (Trivedi et al, 2004;Mallet et al, 2013), and the adsorption mechanisms of heavy-metal cations/oxyanions on Fh have been well studied, including ligand exchange (Mustafa et al, 2004;Das et al, 2013), electrostatic interactions , surface precipitation (Michael et al, 2013), etc.…”

Section: Introductionmentioning

confidence: 99%

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Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

et al. 2016

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h i g h l i g h t s• Phosphate and Zn(II) exhibited a synergistic adsorption on Ferrihydrite.• The effects of pH on the adsorption of the two contaminants were investigated.• XPS and ATR-FTIR demonstrated ternary complexes were formed on Ferrihydrite.• A phosphate-bridged ternary complexes model was proposed. a r t i c l e i n f o b s t r a c tFerrihydrite (Fh) is of great importance in affecting the migration and transformation of heavy-metal cations and oxyanions. To advance the understanding of co-adsorption reactions on Fh surface, the coadsorption of phosphate and Zn(II) from aqueous solution to a synthesized Fh was determined. The batch experiments demonstrated a synergistic adsorption of phosphate and Zn(II) on Fh. In the pH range of 3.5-6, the adsorption of the two contaminants showed strong pH dependence in the single solute adsorption systems, but the dependence alleviated in the simultaneous adsorption system. X-ray photoelectron spectroscopy (XPS) revealed that the chemical shifts of Zn 2p 1/2 and Zn 2p 3/2 binding energies were more significant than that of P 2p in the single and simultaneous adsorption systems. On the other side, in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) observed increased formation of outer-and inner-sphere complexes of phosphate in the simultaneous system. Thus, the synergistic adsorption of the two contaminants could be attributed to the formation of ternary complexes as well as electrostatic interactions, while surface precipitation could not be completely ruled out. On the basis of the results from both the batch adsorption experiments and structural characterization, these two contaminants were likely to form phosphate-bridged ternary complexes (≡Fe-P-Zn) in the simultaneous adsorption system.

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Section: Effects Of Ph On the Adsorption Of Phosphate And Zn(ii)supporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

et al. 2016

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“…However, the effects of soil properties are not accounted for when using these models. It is well documented that soil constituents such as organic matter (OM) and iron oxides (IOs) play important roles in the sorption of contaminants in soil (Pérez-Novo et al 2008;Agbenin 2010;Agbenin and Olojo 2004;Mustafa et al 2004;Olu-Owolabi et al 2014), but the effects of degradation of soil OM/IO and contaminant/soil contact time on redistribution of contaminants within the soil constituents are hardly known.…”

Section: Introductionmentioning

confidence: 99%

“…Tropical soils are especially rich in hydrous IO minerals (hematite, goethite, and ferrihydrite). The surface chemistry of these oxides is responsible for the adsorption, remobilization, and distribution of toxic metals (Mustafa et al 2004;Spathariotis and Kallianou 2001). Studies have reported noncompetitive and competitive sorptions of heavy metals on soils in relation to its OM or IO contents (Agbenin 2010;Pérez-Novo et al 2008;Arias et al 2002;Juang and Chung 2004;Lai et al 2002;Serrano et al 2005;Shaato 1996).…”

Section: Introductionmentioning

confidence: 99%

Effects of time, soil organic matter, and iron oxides on the relative retention and redistribution of lead, cadmium, and copper on soils

Diagboya

Olu-Owolabi

Adebowale

2015

Environ Sci Pollut Res

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In order to predict the bioavailability of toxic metals in soils undergoing degradation of organic matter (OM) and iron oxides (IOs), it is vital to understand the roles of these soil components in relation to metal retention and redistribution with time. In this present work, batch competitive sorptions of Pb(II), Cu(II), and Cd(II) were investigated between 1 and 90 days. Results showed that competition affected Cd(II) sorption more than Cu(II) and Pb(II). The sorption followed the trend Pb(II) >>Cu(II)>Cd(II), irrespective of aging, and this high preference for Pb(II) ions in soils reduced with time. Removal of OM led to reduction in distribution coefficient (K d ) values of ≈33 % for all cations within the first day. However, K d increased nearly 100 % after 7 days and over 1000 % after 90-day period. The enhanced K d values indicated that sorptions occurred on the long run on surfaces which were masked by OM. Removal of IO caused selective increases in the K d values, but this was dependent on the dominant soil constituent(s) in the absence of IO. The K d values of the IOdegraded samples nearly remained constant irrespective of aging indicating that sorptions on soil components other than the IO are nearly instantaneous while iron oxides played greater role than other constituents with time. Hence, in the soils studied, organic matter content determines the immediate relative metal retention while iron oxides determine the redistribution of metals with time.

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“…Adsorption and desorption are important processes governing the mobility and bioavailability of heavy metals in soils and groundwater [1]. Adsorption-desorption of Zn in soils and waters can be affected by many factors, such as aging [2,3], adsorbent properties [4][5][6], and concentration [7,8].…”

Section: Introductionmentioning

confidence: 99%

EXAFS studies on adsorption irreversibility of Zn(II) on TiO2: Temperature dependence

Pan

Zhang

et al. 2008

Journal of Colloid and Interface Science

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Adsorption irreversibility of Zn(II) on TiO 2 at various temperatures was studied using a combination of classical macroscopic methods and extended X-ray absorption fine structure (EXAFS) spectroscopy. When the temperature was increased from 5 to 40 • C, the Zn(II) adsorption capacity increased by 130%, and adsorbed Zn(II) became more reversible. The standard Gibbs free energy change ( G 0 ) of the adsorption reaction at 5, 20, and 40 • C was determined to be −19.58 ± 0.30, −22.28 ± 0.10, and −25.14 ± 0.21 kJ mol −1 , respectively. And the standard enthalpy ( H 0 ) and entropy ( S 0 ) were 24.55 ± 2.91 kJ mol −1 and 159.13 ± 0.53 J mol −1 K −1 , respectively. EXAFS spectra results showed that the hydrated Zn(II) was adsorbed through fourfold coordination with an average Zn-O bond distance of 1.98 ± 0.01 Å. Two Zn-Ti atomic distances of 3.25 ± 0.02 and 3.69 ± 0.03 Å were observed, which corresponded to an edge-sharing linkage mode (strong adsorption) and a cornersharing linkage mode (weak adsorption), respectively. As the temperature increased from 5 to 40 • C, the number of strong adsorption sites (N 1 ) remained relatively constant while the number for the weak adsorption sites (N 2 ) increased by 31%. These results indicate that the net gain in adsorption capacity and the decreased adsorption irreversibility at elevated temperatures were due to the increase in available weak adsorption sites (N 2 ) or the decrease in the ratio of N 1 /N 2 . Both the macroscopic sorption/desorption equilibrium data and the molecular level evidence of this study suggest that in a given environmental system (e.g., soils or natural waters) zinc and other similar heavy metals are likely more mobile at higher temperatures.

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Cadmium adsorption and desorption behaviour on goethite at low equilibrium concentrations: effects of pH and index cations

Cited by 101 publications

References 40 publications

Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

Effects of time, soil organic matter, and iron oxides on the relative retention and redistribution of lead, cadmium, and copper on soils

EXAFS studies on adsorption irreversibility of Zn(II) on TiO2: Temperature dependence

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