Thallium adsorption onto polyacryamide–aluminosilicate composites: A Tl isotope tracer study

Şenol, Zeynep Mine; Ulusoy, Uğur

doi:10.1016/j.cej.2010.05.005

Cited by 51 publications

(19 citation statements)

References 33 publications

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“…However, Tl(III) Dcell was about 82.9% of Tl(III) DDGT. The ratio of Dcell to DDGT was similar to that for As(III) and As(V) reported by Bennett et al, 54 in which Dcell/DDGT for As(III) and As(V) were 79% and 82%, respectively. To keep consistency of calculation of DGT measured concentrations, Dcellwas used for calculation in eq 1. species calculated using the PhreeQC program incorporating the water physical parameters (SI , Table S6) and the concentration of various ions (SI , Table S7) are listed in Table S8.…”

Section: Measurement Of Diffusionsupporting

confidence: 87%

“…Strength. According to theory of the DGT technique, in the simple solution without metal organic complexes and colloids, DGT-measured concentrations, CDGT, of analytes should be equal to the corresponding solution concentrations, Csoln, indicating that the ratio, R value, of CDGT to Csoln should be 1.0 ± 0.1 54. Changes of R value with different pH are shown inFigures 3a and 3b.…”

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confidence: 99%

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In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

et al. 2018

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Thallium (Tl) has been identified as a priority contaminant because of its severe toxic effects. Exact measurement of Tl is a challenge because it is difficult to avoided altering the element's chemical speciation during sampling, transport, and storage. In situ measurement may be a good choice. Based on the in situ technique of Diffusive Gradient in Thin-films (DGT), new DGT devices equipped with novel laboratory-synthesized manganese oxide (δ-MnO2) binding gels were developed and systematically validated for the measurement of Tl, including Tl(I) and Tl(III) species, in water. Comparison between Chelex binding gel and δ-MnO2 gel on the uptake kinetic of Tl demonstrated that δ-MnO2 binding gels could adsorb Tl rapidly and effectively. Removal of Tl from the δ-MnO2 gels was achieved using 1 mol L-1 oxalic acid, yielding elution efficiencies of 1.0 and 0.86 respectively for both Tl(I) and TI(III). Theoretical responses from DGT devices loaded with δ-MnO2 gel (δ-MnO2-DGT) were obtained irrespective of pH (4-9) and ionic strength (0.1-200 mmol L-1 NaNO3). δ-MnO2-DGT showed good potential for long-term monitoring of Tl due to its high adsorption capacity of 27.1 μg cm-2 and the stable performance of δ-MnO2 binding gel stored in 0.01 mol L-1 NaNO3 solution for at least 117 d. Field deployment trials confirmed that δ-MnO2-DGT can accurately measure the time-averaged concentrations of Tl in fluvial watercourses. In summary, the newly developed δ-MnO2-DGT shows potential for environmental monitoring and biogeochemical investigation of Tl in waters, sediments, and soils.

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Section: Measurement Of Diffusionsupporting

confidence: 87%

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confidence: 99%

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

et al. 2018

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“…On the one hand, a number of conventional sorbents such as activated carbon , hydrous manganese dioxide , and zeolite have been applied in Tl sorption. On the other hand, more and more novel or low‐cost materials have been adopted, e.g ., some nanoparticles or metal oxides, including multiwall carbon nanotubes (MWCNTs) , titanium dioxide nanoparticles , and RuO 2 –TiO 2 , geological materials such as goethite and pyrolusite , and other adsorbents such as peat , phosphogypsum , fungal biomasses as, e.g ., Aspergillus niger , organic materials polyacrylamide‐aluminosilicate , and Prussian blue immobilized in alginate capsules . Moreover, agricultural by‐products or agricultural waste materials have been emerged for Tl removal, including pistachio hull , fibrous waste tea , sawdust , and various tree leaves .…”

Section: Introductionmentioning

confidence: 99%

Removal of Tl(I) Ions From Aqueous Solution Using Fe@Fe₂O₃ Core‐Shell Nanowires

Deng

Zhang

et al. 2016

CLEAN Soil Air Water

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A unique nanoscale zero-valent iron, Fe@Fe 2 O 3 core-shell nanowire (FCSN) was synthesized and evaluated as adsorbent for effective removal of thallium(I) ions. Adsorption of Tl(I) onto FCSNs was pH-independent and strongly dependent on ionic strength. However, even under high ionic strength condition, the FCSNs still showed fairly good adsorption capacity (distribution coefficient, K d, ¼ 10 3 $ 10 4 mL/g). The Tl(I) adsorption reached equilibrium within 180 min, and followed the pseudo-second-order rate equation. The adsorption capacity is 17.8 mg/g with an initial Tl(I) concentration of 10 mg/L at 303 K. The adsorption equilibrium data were fitted better by the Langmuir and Freundlich isotherm than the D-R isotherm. The thermodynamic parameters were estimated and the DH 0 and DG 0 values revealed Tl(I) adsorption on FCSNs was an endothermic and spontaneous process. The desorption and regeneration studies demonstrated that FCSNs still retained high Tl(I) removal efficiency after five consecutive adsorption-desorption processes. The as-prepared and Tl-loaded FCSNs were characterized by X-ray powder diffraction, scanning electron microscopy, energydispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy to identify elements and structure of the FCSNs, and verify the removal mechanisms. The characterization results suggested that the possible removal mechanism involved the dominant Tl(I) sorption, followed by the partial transformation of Tl(I) into Tl 2 O, precipitating on the surface of FCSNs without any redox reaction taking place. These results suggest that FCSNs may be the potential sorbents for the detoxication of Tl(I) from aqueous solution.

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“…Previous research on removal technologies has focussed on using pre-concentration of Tl by chelating resins [15]; oxidative precipitation of thallichydroxide, reductive cementation of thallium; chemical precipitation by hydroxide compounds, solvent extraction using tributyl phosphate (TBP), trioctyl phosphine oxide (TOPO) [16,17]; extraction by complex forming re-agents [18]. U.S.EPA approved various treatment technologies such as activated alumina and ion exchange for removal of thallium but the methods are seemingly costly and ineffective [19].…”

Section: Introductionmentioning

confidence: 99%

The adsorption potential and recovery of thallium using green micro-algae from eutrophic water sources

Birungi

Chirwa

2015

Journal of Hazardous Materials

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Thallium (Tl) is a highly volatile and toxic heavy metal regarded to cause pollution even at very low concentrations of several parts per million. Despite the extremely high risk of Tl in the environment, limited information on removal/recovery exists. The study focussed on the use of green algae to determine the sorption potential and recovery of Tl. From the study, removal efficiency was achieved at 100% for lower concentrations of ≥ 150 mg/L of Tl. At higher concentrations in a range of 250-500 mg/L, the performance of algae was still higher with sorption capacity ( max q ) between 830 and 1000 mg/g. Generally, Chlorella vulgaris was the best adsorbent with a high max q and lower affinity of 1000 mg/g and 1.11 L/g respectively. When compared to other studies on Tl adsorption, the tested algae showed a better max q than most adsorbents. The kinetic studies showed better correlation co-efficient of ≤ 0.99 for Pseudo-second order model than the first order model. Recovery was achieved highest for Chlorella vulgaris using nitric acid at 93.3%. The strongest functional groups responsible for Tl binding on the algal cell wall were carboxyl and phenols. Green algae from freshwater bodies showed significant potential for Tl removal/recovery from industrial wastewater.

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Thallium adsorption onto polyacryamide–aluminosilicate composites: A Tl isotope tracer study

Cited by 51 publications

References 33 publications

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

Removal of Tl(I) Ions From Aqueous Solution Using Fe@Fe₂O₃ Core‐Shell Nanowires

The adsorption potential and recovery of thallium using green micro-algae from eutrophic water sources

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Thallium adsorption onto polyacryamide–aluminosilicate composites: A Tl isotope tracer study

Cited by 51 publications

References 33 publications

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO2 Gel Layer

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO2 Gel Layer

Removal of Tl(I) Ions From Aqueous Solution Using Fe@Fe2O3 Core‐Shell Nanowires

The adsorption potential and recovery of thallium using green micro-algae from eutrophic water sources

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In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO₂ Gel Layer

Removal of Tl(I) Ions From Aqueous Solution Using Fe@Fe₂O₃ Core‐Shell Nanowires