Retention of copper by desert sands coated with ferric hydroxides

Al-Sewailem, M. S.; Khaled, E. M.; Mashhady, A. S.

doi:10.1016/s0016-7061(98)00082-2

Cited by 26 publications

(17 citation statements)

References 22 publications

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“…(1)- (5). Kinetic parameters for four kinetic model and correlation coefficients of Cu(II) and Pb(II) under different temperature were calculated from these plots and listed in Table 2.…”

Section: Determination Of Kinetic Constantsmentioning

confidence: 99%

“…Adsorption can remove metals over a wider pH range and lower concentrations than precipitation [4]. Iron, aluminum, and manganese oxides are typically thought to be the most important scavengers of heavy metals in aqueous solution or wastewater due to their relatively high surface area, microporous structure, and possess OH functional groups capable of reacting with metals, phosphate and other specifically sorbing ions [5]. However, most metal oxides are available only as fine powders or are generated in aqueous suspension as hydroxide floc or gel.…”

Section: Introductionmentioning

confidence: 99%

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Removal of copper(II) and lead(II) from aqueous solution by manganese oxide coated sand

Han

Zou

Zhang

et al. 2006

Journal of Hazardous Materials

296

138

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“…(1)- (5). Kinetic parameters for four kinetic model and correlation coefficients of Cu(II) and Pb(II) under different temperature were calculated from these plots and listed in Table 2.…”

Section: Determination Of Kinetic Constantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of copper(II) and lead(II) from aqueous solution by manganese oxide coated sand

Han

Zou

Zhang

et al. 2006

Journal of Hazardous Materials

296

138

View full text Add to dashboard Cite

“…In fact, the particulate organic matter and the coatings formed by Fe and Mn oxides can account for up to 50% of the total surface area of the sediments (Turner et al 2004). It has been observed that although the secondary Fe oxides, considered of high reactivity, are present mainly in the <63 μm fraction, high proportions of these oxides can be found in the coarse fraction of bed sediments and, as a result, they highly influence its reactivity (Al-Sewailem et al 1999;Ewais et al 2000;Poulton and Raiswell 2005). Also, it has been observed in many rivers that more than 50% of the metals present are associated with the organic matter (Förstner and Wittmann 1983;Mendiguchía et al 2005), which is, therefore, a key factor in the behaviour of metals in sediments, particularly with regard to their mobility (Doing and Liber 2005;Bauer and Blodau 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of enrichment factors and grain size influence on the metal distribution in riverbed sediments (Anllóns River, NW Spain)

Rey¹,

Dı́az-Fierros²,

Barral³

2010

Environ Monit Assess

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The metals distribution in the bed sediments of the Anllóns River was studied, with special emphasis on the evaluation of the metal distribution as a function of the granulometric fraction chosen for the analysis. Statistical significant differences between the distribution of K, Ca, Cr, Mn, As, Rb, Sr and Nb in the bulk (<2 mm) and fine fraction (<63 μm) were not found. Fe, Ni, Cu, Ga, Zr, Zn and Pb commonly appear in higher concentrations in the fine fraction, whereas Ti appears in higher concentrations in the bulk fraction. In general, it was observed that contamination phenomena tend to equalise the concentrations of both fractions, and this was mainly explained as the result of two processes. First, the formation of coatings over sands and, second, the formation of large aggregates (pseudo-sands) at sites located over basic rocks, whose chemical behaviour is closer to that of clays and could be responsible for significant adsorption processes. Normalisation techniques to evaluate contamination were applied by testing Nb, Sr, Rb or Ga as normaliser elements and by using crustal or shale average values for background concentrations. The most satisfactory result was obtained when using shale average values and Ga as the normaliser element. Arsenic was identified as the main contaminant of the basin, exceeding in all cases the low-effect reference values proposed by sediment quality guidelines and in two cases the medium-effect reference values. These sites were identified by multivariate techniques, which allow differentiating site 10 as affected by anthropogenic inputs related to past mining activities.

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“…However, the coated layer shed easily leaving the granules with little adsorption capacity, and caused secondary pollution to the drinking water because of its low mechanical stability. At the same time, the ratios of coated-layer to carrier were below 1% in the reported literature [12][13][14], which greatly limited the adsorption capacity of the coated adsorbent particles. Copolymer latex has been introduced as a binder to reinforce the bonding between adsorbent and carrier.…”

Section: Introductionmentioning

confidence: 83%

Granulation of Fe–Al–Ce hydroxide nano-adsorbent by immobilization in porous polyvinyl alcohol for fluoride removal in drinking water

Wang

Chen

et al. 2011

Powder Technology

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Nano-adsorbents of Fe-Al-Ce trimetal hydroxide (FAC) were immobilized in porous polyvinyl alcohol (PVA) via cross-linking with boric acid. Spherical composite granules of 3-5 mm in size that would not cause a large pressure drop in a packed bed were obtained. SEM images showed that the FAC particles were embedded in holes of about 10 μm in the PVA granules, while the surface pores of the granules were only nano-scale in size. Thermal analysis showed that the FAC and PVA in the granules combined tightly by forming a chemical bond. The mechanical stability of the granules decreased with increased FAC concentration, and increased with increased PVA concentration. The fluoride adsorption capacity of the granules increased with FAC concentration and decreased with PVA concentration. For acceptable mechanical stability and adsorption capacity, a FAC concentration of 12% and PVA concentration of 7.5% were suggested. The adsorption capacity of the granules prepared under suggested concentrations was 4.46 mg/g at an initial fluoride concentration of 19 mg/L and pH 6.5. Immobilization of the nano-adsorbent in porous polyvinyl alcohol granules is a promising granulation method for water treatment in packed beds.

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Retention of copper by desert sands coated with ferric hydroxides

Cited by 26 publications

References 22 publications

Removal of copper(II) and lead(II) from aqueous solution by manganese oxide coated sand

Removal of copper(II) and lead(II) from aqueous solution by manganese oxide coated sand

Assessment of enrichment factors and grain size influence on the metal distribution in riverbed sediments (Anllóns River, NW Spain)

Granulation of Fe–Al–Ce hydroxide nano-adsorbent by immobilization in porous polyvinyl alcohol for fluoride removal in drinking water

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