Oxidation of As(III) by MnO2 in the absence and presence of Fe(II) under acidic conditions

Han, Xu; Li, Yiliang; Gu, Ji‐Dong

doi:10.1016/j.gca.2010.10.010

Cited by 78 publications

(42 citation statements)

References 33 publications

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“…As(III) concentration was obtained by the subtraction of total As and As(V) concentrations. In our previous study, detection limits for As(V) and total As were found to be 0.005 and 0.022 mg L -1 , respectively (Han et al 2011).…”

Section: Analytical Methods and Characterizationmentioning

confidence: 91%

Application of a high-surface-area schwertmannite in the removal of arsenate and arsenite

Song

Jia

Ren

et al. 2014

Int. J. Environ. Sci. Technol.

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Schwertmannite is a poorly crystalline Fe(III) hydroxide, which always shows high sorption capacities to pollutants. In this study, schwertmannite synthesized from the Fe 3? hydrolyzation method showed a hedgehog-like shape, with a specific surface area of 325.5 m 2 g -1 , which was much higher than that of the sphere-like schwertmannite synthesized from the Fe 2? oxidation method, with a specific surface area of 48.2 m 2 g -1 . The former was then used to evaluate its sorption performance to As(V) and As(III). Sorption of As(V) and As(III) could reach equilibrium in 200 min, and the maximum sorption capacities of As(V) and As(III) were 182.86 and 45.50 mg g -1 at pH 3.0, respectively, and 143.25 and 217.85 mg g -1 at pH 7.0, respectively. Sorption capacity was dependent on pH and more As(V) adsorbed on schwertmannite at lower pH, while As(III) sorption increased with the increase of pH. Our results also indicated that the presence of sulfate reduced the sorption of As(V) from 85.4 to 67.6 mg g -1 as sulfate concentration increased from 0.2 to 6 g L -1 , while such an effect was not apparent in As(III) sorption. Nitrate and chloride did not show significant interference on the sorption of both As(V) and As(III). Schwertmannite showed better repeated uses in the removal of As(V) and As(III) after seven repeated using cycles with removal percentages of 95.3 % at pH 3.0 and 63.9 % at pH 7.0 to As(V), and 31.0 % at pH 3.0 and 81.6 % at pH 7.0 to As(III).

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Section: Analytical Methods and Characterizationmentioning

confidence: 91%

Application of a high-surface-area schwertmannite in the removal of arsenate and arsenite

Song

Jia

Ren

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Oxidation of As(III) to As(V) is an effective pathway to reduce As(III) toxicity and its mobility in nature, and common oxidants such as O 2 , H 2 O 2 , KMnO 4 , Fenton reagent and TiO 2 /UV can all oxidize As(III) to As(V), while direct oxidation of aqueous As(III) by the air is a slow process with a half-life of around 1 year (Eary and Schramke 1990). Manganese (hydr)oxides (MnO x ) are ubiquitous minerals in soil and sediments and have been proved to be powerful oxidants in the transformation of dissolved As(III) to As(V) under natural conditions (Chiu and Hering 2000;Han et al 2011;Manning et al 2002;Nesbitt et al 1998;Power et al 2005;Scott and Morgan 1995). By means of X-ray photoelectron spectroscopy (XPS), it was found that Mn(IV) was reduced to Mn(III) intermediate coupled with the oxidation of dissolved arsenite to arsenate on the surfaces of birnessite, and then Mn(III) intermediate was further reduced to Mn(II) by H 3 AsO 3 (Nesbitt et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Abiotic oxidation of Mn(II) and its effect on the oxidation of As(III) in the presence of nano-hematite

Han

2012

Ecotoxicology

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Manganese (hydr)oxides (MnO(x)) is a powerful oxidant in the oxidation of As(III) in natural environment. Under some circumstances, Mn(II) can be oxidized to MnO(x) which in turn accelerates the oxidation of As(III). However, to the best of our knowledge, little is known regarding how Mn(II) affects the oxidation of both the dissolved and the adsorbed As(III) in aquatic environments. In this study, effects of abiotic oxidation of Mn(II) on the oxidation of As(III) were investigated. Kinetic results as well as TEM and XRD analyses confirmed the formation of amorphous MnO(x) after sorption of Mn(II) on hematite nano-particles under oxic conditions. Mn(II) was oxidized to Mn(III) and then to Mn(IV), and this process was dependent upon pH and Mn(II) concentrations. The newly formed MnO(x) played an important role in the further oxidation of the dissolved and the adsorbed As(III) on hematite, and the oxidation rate of As(III) increased with the rising Mn(II) concentrations. As the adsorbed As(III) was oxidized to As(V), a fraction of As(V) was released into the solution, which increased the mobility of As. The present study reveals that abiotic oxidation of Mn(II) affects the oxidation of As(III) in aquatic environment.

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“…Because of this, research and technological innovation has also been conducted in a similar pattern over time in developed countries first and then developing ones. It is apparent that chemical analysis yields specific information on the individual chemicals, their forms, bioavailability, but (eco)toxicology combines the information of chemicals and organisms to make the connection between toxic effects and implications on humans (Han et al 2011;Li et al 2011a, b). From this, our capability in analysis has been advanced far better than toxicology and further enhancement on organism-based analysis of chemical exposure is still needed.…”

mentioning

confidence: 99%

“…It is clear that environmental contamination and cleaning up should be dealt with in case-by-case manner and different techniques can be utilized selectively based on the specific pollutant and conditions of the ecosystem to formulate the science-based approach. It is also clear that nano-materials and abiotic process also have their role to play in affecting the geochemical processes and solving the environmental problems (Xu et al 2009;Luo et al 2013;Han et al 2011). Similarly, phytoremediation is a specific subject where scientific investigation should be focused on removal of metals and metalloid or organics from the polluted niches (Yu and Gu 2006;Yu et al 2008;Mitchell and Gu 2010) and alleochemicals may also facilitate the inhibition of pollution-induce bloom of algae ).…”

mentioning

confidence: 99%

Coastal and marine pollution and ecotoxicology

Wang

2015

Ecotoxicology

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Our planet is under increasing stress from human activities of exploitation of natural resources and biogeochemical processes as well as industrial refinery and production. This is evident by the observations of hypoxia in coastal ocean and also by decrease in biodiversity. As industrialization and urbanization in the developing countries including China, India and Brazil intensify further, more serious deterioration and pollution of the natural ecosystems can be more strongly pronounced than before for air, soil, water and also the biodiversity (Cao et al. 2012(Cao et al. , 2013Han and Gu 2015) . Relevant results from different directions of research focus are reported before on chemical pollutants and ecotoxicological data (Ford and Cheng 2009; Ford et al. 2012; Wang 2012, 2013a;Zhao et al. 2013), continuous investigations with new research tools available are also necessary to further document the changes for better understanding, and also forecasting the changes and trends in the future to better serve our society for regulation and legislative action. Oceans and coastal ecosystems are both important to humans, and protection and conservation will allow future sustainable development and also the human long-term survival (Mitchell and Gu 2010;Shen et al. 2010; Wang 2012, 2013a). The changes documented and reported in China today can be very useful information and mirror images for the changes to be observed in other developing countries, if not now but in the near future.Pollution as a phenomenon closely associated with human society has distinctive phases over time of the history and it includes sewage, toxic chemicals of metals and metalloids and also persistent organic compounds, harmful organisms from toxic algae including dinoflagellates, bacteria and viruses, and more recently the emerging new chemicals of pharmaceuticals and personal care products (Gu and Wang 2013b; Mitchell and Gu 2010;Jiang et al. 2015). This changing trend of different chemicals over time illustrates not only the technological advances in our society and analytical chemistry driving the environmental understanding and study, but also the consumer attitude and habits of our society altering the pollutant types. Synthetic plastics and composite materials are more important than traditional metals and steel, industries associated with manufacturing of them become the major contributors to the new sources of pollutants and types. Because of this, research and technological innovation has also been conducted in a similar pattern over time in developed countries first and then developing ones. It is apparent that chemical analysis yields specific information on the individual chemicals, their forms, bioavailability, but (eco)toxicology combines the information of chemicals and organisms to make the connection between toxic effects and implications on humans (Han et al. 2011; Li et al. 2011a, b). From this, our capability in analysis has been advanced far better than toxicology and further enhancement on organism-based analysis of chem...

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Oxidation of As(III) by MnO2 in the absence and presence of Fe(II) under acidic conditions

Cited by 78 publications

References 33 publications

Application of a high-surface-area schwertmannite in the removal of arsenate and arsenite

Application of a high-surface-area schwertmannite in the removal of arsenate and arsenite

Abiotic oxidation of Mn(II) and its effect on the oxidation of As(III) in the presence of nano-hematite

Coastal and marine pollution and ecotoxicology

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