Selective capture of thallium(I) ion from aqueous solutions by amorphous hydrous manganese dioxide

Wan, Shunli; Ma, Ming‐Guo; Lv, Lu; Qian, Liping; Xu, Shengjie; Yao, Xue; Ma, Zhaozhao

doi:10.1016/j.cej.2013.11.010

Cited by 140 publications

(43 citation statements)

References 40 publications

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“…On the spectrum (Figure 6b) of flocculent sludge collected from Fe 0 -EC processed wastewater, two peaks of Tl 4f, i.e., 4f7/2 and 4f5/2, appeared at 118.69 and 123.09 eV. The XPS peaks show a characteristic of Tl(I) [71], which verified the chemical state of Tl in the processing circumstances is Tl(I). It can be concluded that there is no Tl(I) that was oxidized and thereby no surface precipitation effect on the Tl removal by the Fe 0 -EC treatment.…”

Section: Removal Mechanismmentioning

confidence: 58%

“…There is obvious Tl(I) sorption onto α-FeOOH at pH values of less than 9.3, the PZC of α-FeOOH [70] indicated that, besides deriving exospheric complexes induced by electrostatic attraction, Tl(I) is inclined to form stable inner-sphere complexes on iron oxides/hydroxides. In addition, studies have proved that the adsorption mechanism of Tl(I) on amorphous manganese oxide also fit the inner-sphere complexes model [71].…”

Section: Removal Mechanismmentioning

confidence: 79%

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Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Yang

et al. 2020

Water

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As thallium (Tl) is a highly toxic heavy metal, there are compulsory environmental regulations in many countries on minimizing its release. This research investigated the treatment of real industrial wastewater with low Tl(I) concentration by Fe0-electrocoagulation (Fe0-EC) in a batch aeration-forced pump cycle reactor. The effects of pH (7–12), current density (8.3–33.3 mA/cm2), dissolved oxygen (DO) in wastewater, and initial Tl(I) concentration (66–165 µg/L) on Tl(I) removal efficiency were investigated. The removal efficiency of Tl(I) is pH-dependent, to be exact, it increases significantly with pH rising from 8 to 11. Initial pH of influent and DO concentration were the key operation parameters which strongly affect Tl(I) removal. After the water sample with initial Tl(I) concentration of 115 µg/L was treated for 12 min by a single-step process at pH of 11 and current density of 16.7 mA/cm2, the residual Tl(I) concentration was decreased to beneath the emission limit in China (2 µg/L) with a low energy consumption of 0.82 kWh/m3. By prolonging the operation time, the concentration was further reduced to 0.5 µg/L or even lower. The main composition of the flocculent sludges is iron oxyhydroxide, yet its crystal structure varies dependent on pH value which may result in different Tl(I) removal efficiency. Feroxyhyte nanosheets generate in situ by Fe0-EC, which contributes to the rapid and effective removal of Tl(I), while the speedy oxidation under DO-enriched conditions benefits the feroxyhyte formation. The mechanism of Tl(I) removal by Fe0-EC is attributed to the combination of electrostatic attraction and the formation of inner-sphere complexes. As shown in the technical and mechanical studies, Fe0-EC technology is an effective method for low Tl concentration removal from wastewater.

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Section: Removal Mechanismmentioning

confidence: 58%

Section: Removal Mechanismmentioning

confidence: 79%

Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Yang

et al. 2020

Water

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“…Nevertheless, gaseous thallium (Tl) pollution due to smelting off-gas has not yet been addressed. [1] Tl has atomic number 81 and is a bluishwhite dispersed element with no natural free existence. [2] The emissions of gaseous Tl have increased dramatically in the past 20 years due to the refining of heavy-metal sulfide ores, of which it is a byproduct, as well as the raising demands of Tl in the electronic, pharmaceutical, and glass manufacturing industries.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, activated carbon (AC), clay, and Al 2 O 3 have been used as adsorbents to remove Tl from drinking water, [20] and MnO x compounds have been employed as catalytic oxidants in Tl-rich aquatic environments. [1,21] Based on the abovementioned considerations, we herein synthesized Mn-impregnated AC catalysts, which displayed a superior low temperature catalytic activity on the removal of Tl(I). Furthermore, Tl removal effect decreased with temperature increasing, whereas the oxidation of Tl(I) to Tl(III) increased.…”

Section: Introductionmentioning

confidence: 99%

Efficient removal of thallium from flow gas using manganite‐based catalysts by gas–solid‐phase catalytic oxidation at low temperature

Ning

Wang

et al. 2020

Applied Organom Chemis

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Thallium (Tl) is a highly toxic heavy metal, for which its removal from aqueous environments has gained increasing attention. However, removal of Tl from the gas phase is yet to be addressed, especially at low temperature. Herein, we synthesized and characterized a manganite‐based active carbon (Mn–AC) catalyst via an impregnation method process. The Mn–Ac catalyst was then used for elemental Tl removal from simulated flow gas in a laboratory‐scale fixed‐bed reactor. Tl(I) was adsorbed by the AC and oxidized by active Mn, resulting in Tl(III). In addition, experiments were performed at varying temperatures and different Mn dosages to evaluate the efficiency of Tl removal in various conditions. The Mn–AC catalysts were shown to oxidize Tl(I) to Tl(III) on their surface with Tl removal efficiency decreasing with increasing temperature, reaching a removal rate of 90% over 8 h at 25°C. Further, increasing Mn content led to a decrease in surface area and a convolution of the AC morphology. Mn(10%)–AC was shown to have the highest gas‐phase Tl removal efficiency (≥90%, over 8 h).

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“…In the last decade, extensive researches have been conducted for the purpose of identifying new, efficient, and low‐cost sorbents for the removal or preconcentration of Tl. 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 .…”

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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Selective capture of thallium(I) ion from aqueous solutions by amorphous hydrous manganese dioxide

Cited by 140 publications

References 40 publications

Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Efficient removal of thallium from flow gas using manganite‐based catalysts by gas–solid‐phase catalytic oxidation at low temperature

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

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Selective capture of thallium(I) ion from aqueous solutions by amorphous hydrous manganese dioxide

Cited by 140 publications

References 40 publications

Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Removal of Trace Thallium from Industrial Wastewater by Fe0-Electrocoagulation

Efficient removal of thallium from flow gas using manganite‐based catalysts by gas–solid‐phase catalytic oxidation at low temperature

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

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