Impact of environmental conditions on the sorption behavior of Pb(II) in Na-bentonite suspensions

Yang, Shitong; Zhao, Donglin; Zhang, Hui; Su, Lu; Chen, Lei; Yu, Xiaojiao

doi:10.1016/j.jhazmat.2010.07.072

Cited by 231 publications

(77 citation statements)

References 54 publications

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“…1a) [24]. FTIR spectrum showed that the strong and broad band at 3436 cm À1 was due to the stretching vibration of the HAOH bond of water molecules adsorbed on the solid surface; the absorption at 1635 cm À1 was associated with the bending vibration of the HAOH bond of water molecules; the strong band at 1049 cm À1 represented the stretching vibration of SiAOASi groups of the tetrahedral sheet; the band at 470 cm À1 corresponded to the bending vibration of SiAOASi groups [25]; and the active absorption band at 1384 cm À1 was assigned to symmetric stretching vibration of the interlayer carbonate anion (Fig. 1b) Wavenumber (cm -1 ) [26].…”

Section: Characterization and Activity Of The Catalystmentioning

confidence: 99%

The activity and selectivity of catalytic peroxide oxidation of chlorophenols over Cu–Al hydrotalcite/clay composite

Zhou¹,

Gu²,

Qian³

et al. 2011

Journal of Colloid and Interface Science

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Section: Characterization and Activity Of The Catalystmentioning

confidence: 99%

The activity and selectivity of catalytic peroxide oxidation of chlorophenols over Cu–Al hydrotalcite/clay composite

Zhou¹,

Gu²,

Qian³

et al. 2011

Journal of Colloid and Interface Science

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“…Figure 1 shows that free ionic Pb 2+ is the most concentrated form (80-90%) under acidic conditions, whereas Pb-OH (90-100%) dominates under alkaline condition. Yang et al (2010) also reported a similar pattern of Pb speciation while describing its adsorption on ß-MnO 2 .…”

Section: Effect Of Ph On Pb Speciation In Nutrient Solutionmentioning

confidence: 65%

Assessment of lead speciation by organic ligands using speciation models

Shahid

Dumat

Aslam

et al. 2012

Chemical Speciation & Bioavailability

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The biogeochemical behaviour of lead (Pb) in ecosystems greatly depends on its chemical species. Organic ligands strongly influence Pb species and mobility in soil solution. In the present study, two metal speciation models, Windermere Humic Aqueous Model (WHAM) and Visual Minteq are used to compute Pb speciation in nutrient solution in the presence and absence of organic ligands. The three organic ligands used include ethylenediamine tetraacetic acid (EDTA), citric acid (CA) and fulvic acid (FA). The results show that in the absence of organic ligands, Pb 2+ is the dominant form under acidic conditions and Pb-OH under alkaline conditions. The presence of organic ligands strongly influences Pb speciation. EDTA is more effective than are CA and FA concerning its influence on Pb speciation due to high Pb binding capacity. The results also indicate that Pb binding capacity of organic ligands varies with solution pH.

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“…The band at 1638 cm -1 is assigned to the bending of H-OH bond of water molecules (Madejová 2003). The (Al, Mg)-OH vibration mode is indicated by the band at 525 cm -1 (Yang et al 2010), and the band at 468 cm -1 indicates the bending of Si-O-Si bonds (Saleh 2015). After the incorporation of PVAG binder to BEN, the band assigned to the structural -OH of BEN at 3627 cm -1 disappeared in the spectra of BEN-PVAG (Fig.…”

Section: Resultsmentioning

confidence: 99%

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Ngoh

Nawi

2016

Int. J. Environ. Sci. Technol.

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An immobilized clay composite (BEN-PVAG) on a glass plate (GP) was fabricated using bentonite powder (BEN) and glutaraldehyde cross-linked polyvinyl alcohol (PVAG) as the adsorbent and adhesive, respectively. The immobilized bentonite composite (BEN-PVAG) was characterized using SEM, EDX, FTIR, and BET analysis. The adsorption capacity of BEN-PVAG was examined using methylene blue (MB) as the model pollutant. The results indicated that the adsorption of MB onto BEN-PVAG obeyed pseudo-second-order kinetics. In addition, the adsorption of MB by the immobilized BEN-PVAG was controlled by intra-particle diffusion. In contrast, the adsorption of MB by the suspended BEN-PVAG composite was dominated by film diffusion. The immobilized BEN-PVAG was then applied as the adsorbent sublayer for the fabrication of P-25TiO 2 /BEN-PVAG/GP bilayer system where P-25TiO 2 was deposited as the top layer. The fabricated bilayer system exhibited synergistic photocatalytic-adsorptive removal of MB upon irradiation with a light source, while experiment in the dark yielded only adsorption process. The rate of the synergistic photocatalytic-adsorptive removal of MB by the P-25TiO 2 / BEN-PVAG/GP was 5.3 times faster than the suspended P-25TiO 2 . The result implied the positive impact of the BEN-PVAG adsorbent sub-layer on the immobilized P-25TiO 2 photocatalyst. Most important, the immobilized P-25TiO 2 /BEN-PVAG/GP provided a convenient reuse of the catalyst over time where the treated water could be directly discharged without the need of filtration.

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Impact of environmental conditions on the sorption behavior of Pb(II) in Na-bentonite suspensions

Cited by 231 publications

References 54 publications

The activity and selectivity of catalytic peroxide oxidation of chlorophenols over Cu–Al hydrotalcite/clay composite

The activity and selectivity of catalytic peroxide oxidation of chlorophenols over Cu–Al hydrotalcite/clay composite

Assessment of lead speciation by organic ligands using speciation models

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

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