Adsorption and Oxidation of Thallium(I) by a Nanosized Manganese Dioxide

Huangfu, Xiaoliu; Jiang, Jin; Lu, Xixin; Wang, Yaan; Liu, Yongze; Pang, Shengyong; Cheng, Haijun; Zhang, Xiang

doi:10.1007/s11270-014-2272-7

Cited by 93 publications

(38 citation statements)

References 42 publications

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“…High removal capacity, simple operation and good stability implied that this nanocomposite could be applied to treating heavy metals in real water. Besides, nanoscale manganese dioxide could also be used in the adsorption and oxidation of Tl (I) in wastewater [170]. This batch adsorption process could be finished in 15 min and the maximum removal capacity was calculated to be 672 mg·g −1 by using Langmuir model, indicating the potential of nanosized manganese oxides to be used in Tl treatment.…”

Section: Nanomaterials For Removing Heavy Metalsmentioning

confidence: 99%

Nanomaterials for the Removal of Heavy Metals from Wastewater

et al. 2019

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Removal of contaminants in wastewater, such as heavy metals, has become a severe problem in the world. Numerous technologies have been developed to deal with this problem. As an emerging technology, nanotechnology has been gaining increasing interest and many nanomaterials have been developed to remove heavy metals from polluted water, due to their excellent features resulting from the nanometer effect. In this work, novel nanomaterials, including carbon-based nanomaterials, zero-valent metal, metal-oxide based nanomaterials, and nanocomposites, and their applications for the removal of heavy metal ions from wastewater were systematically reviewed. Their efficiency, limitations, and advantages were compared and discussed. Furthermore, the promising perspective of nanomaterials in environmental applications was also discussed and potential directions for future work were suggested.

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Section: Nanomaterials For Removing Heavy Metalsmentioning

confidence: 99%

Nanomaterials for the Removal of Heavy Metals from Wastewater

et al. 2019

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“…Especially the highly reactive transient hydroxyl radicals might represent strong oxidants, considering that the production of hydroxyl radicals is speeded up by Fe(II) generated by photoreduction (photo-Fenton reactions). Indeed, AMDs in the Baccatoio mining area are characterized by high iron and manganese content, whose hydro-geochemistry is well known to be able to influence the oxidation state of thallium (Davies et al, 2016;Gadde and Laitinen, 1974;Huangfu et al, 2015;Peacock and Moon, 2012). The ability of Mn(IV) to oxidize Tl(I) is known (Huangfu et al, 2015), while no spontaneous oxidation of Tl(I) from Fe(III) is expected on thermodynamic grounds.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, AMDs in the Baccatoio mining area are characterized by high iron and manganese content, whose hydro-geochemistry is well known to be able to influence the oxidation state of thallium (Davies et al, 2016;Gadde and Laitinen, 1974;Huangfu et al, 2015;Peacock and Moon, 2012). The ability of Mn(IV) to oxidize Tl(I) is known (Huangfu et al, 2015), while no spontaneous oxidation of Tl(I) from Fe(III) is expected on thermodynamic grounds. In the case of iron, therefore, the combination with more chemical agents and radiation might be fundamental to explain oxidation reactions otherwise not spontaneous in natural systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of environmental and anthropogenic parameters on thallium oxidation state in natural waters

et al. 2018

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The abandoned mining area of Valdicastello Carducci (Tuscany, Italy) is characterized by the massive presence of thallium in the acid mine drainages and in the valley stream crossing the region. We previously found that Tl(III), generally considered the less stable oxidation state of thallium, is present both in the stream and in tap water distributed in the area, whereas acid mine drainages only contain Tl(I). These findings posed some concern related to the reactivity and dispersion of this toxic element in the environment. Since the valence state of thallium determines its toxicity, distribution and mobility, the study of thallium redox speciation appears crucial to understand its environmental behaviour. In this work, water samples collected from the mine drainages and the contaminated stream were adopted as model to study the distribution of aqueous Tl(I)/Tl(III) as a function of light exposure and solution properties and composition. The influence of three light sources and organic acids was evaluated. Thallium speciation was also assessed in tap water after treatment with common oxidizing agents, and in the rust crust collected from the public waterworks.

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“…The band at 1025.9 cm −1 is ascribed to the vibration mode of the metal hydroxyl (Mn−OH) group. 30 After adsorption of arsenic, the hydroxyl stretching and bending vibration peaks of the water molecule have shifted to 3133.8 and 1618 cm −1 , respectively, with little change in their intensities. Meanwhile, the vibration peak of the Mn−OH group becomes weaker and shifts to 1062.6 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

“…The wavenumber at 524.5 cm –1 is assigned to the Mn–O stretching vibrations. The band at 1025.9 cm –1 is ascribed to the vibration mode of the metal hydroxyl (Mn–OH) group . After adsorption of arsenic, the hydroxyl stretching and bending vibration peaks of the water molecule have shifted to 3133.8 and 1618 cm –1 , respectively, with little change in their intensities.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Manganese Dioxide Nanoparticles for Efficient Removal of Aqueous As(III)

2020

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The development of highly efficient adsorbents for arsenic removal remains a challenge. In this paper, we propose the facile synthesis of hydrous manganese dioxide (HMO) and investigate its application in removal of As(III). By controlling the ratio of precursors, HMOs with different |ZP| values were successfully synthesized. It is found that HMO with a smaller value of |ZP| achieves a higher arsenic removal rate. Adsorption efficiency is confirmed to be pH-dependent and directly related to the adsorbent dosage. In addition, thermodynamics analysis shows that the adsorption reaction appears to be spontaneous and is accompanied by exothermic phenomena. Furthermore, the removal process of As(III) has the best fitting effect by the Freundlich adsorption model and pseudo-secondary dynamics model, which reveal that the adsorption sites are evenly distributed in the adsorption process. The FT-IR and XPS analysis further proves that the arsenite ions and HMO adsorbents have first formed a complex through electrostatic interaction, which is further converted into a more stable internal structure by a redox reaction. This work not only offers a relatively low cost and highly efficient candidate on the treatment of heavy As(III)-contaminated water but also provides a deep understanding of the relationship between the |ZP| value and adsorption behavior.

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Adsorption and Oxidation of Thallium(I) by a Nanosized Manganese Dioxide

Cited by 93 publications

References 42 publications

Nanomaterials for the Removal of Heavy Metals from Wastewater

Nanomaterials for the Removal of Heavy Metals from Wastewater

Influence of environmental and anthropogenic parameters on thallium oxidation state in natural waters

Facile Synthesis of Manganese Dioxide Nanoparticles for Efficient Removal of Aqueous As(III)

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