Arsenic removal by adsorption on iron(III) phosphate

Lenoble, Véronique; Laclautre, Christelle; Deluchat, Véronique; Serpaud, Bernard; Bollinger, Jean‐Claude

doi:10.1016/j.jhazmat.2005.04.005

Cited by 120 publications

(49 citation statements)

References 18 publications

(26 reference statements)

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“…Many forms of iron, such as amorphous iron oxides, can increase As adsorption or form arseniciron compounds with low solubility (Lenoble et al 2005). Ferric sulfate is a good material that can be used to immobilize As in soil.…”

Section: Water-soluble As and Cacl 2 -Extractable Pbmentioning

confidence: 99%

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Cui

Weng

et al. 2010

Water Air Soil Pollut

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The effect of in situ immobilization of lead (Pb) and arsenic (As) in soil with respectively phosphate and iron is well recognized. However, studies on combined Pb and As-contaminated soil are fewer, and assessment of the effectiveness of the immobilization on mobility and bioaccessibility is also necessary. In this study, a Pb and As-contaminated soil was collected from an abandoned lead/zinc mine in Shaoxing, Zhejiang province of China, which has been treated with three phosphates, i.e., calcium magnesium phosphate (CMP), phosphate rock, and single super-phosphate (SSP) for 6 months in a field study. The ferrous sulfate (FeSO 4 ) at 20 g kg −1 was then amended to the soil samples and incubated for 8 weeks in a greenhouse. The solubility and bioaccessibility tests were used to assess the effectiveness of the in situ immobilization. The result showed that phosphates addition decreased the concentrations of CaCl 2 -extractable Pb; however, the concentrations of water-soluble As increased upon CMP and SSP addition. With the iron addition, the water-soluble As concentrations decreased significantly, but CaCl 2 -extractable Pb concentrations increased. The bioaccessibility of As and Pb measured in artificial gastric and small intestinal solutions decreased with phosphate and iron application except for the bioaccessibility of As in the gastric phase with SSP addition. Combined application of phosphates and iron can be an effective approach to lower bioaccessibility of As and Pb, but has opposing effects on mobility of As and Pb in contaminated soils.

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Section: Water-soluble As and Cacl 2 -Extractable Pbmentioning

confidence: 99%

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Cui

Weng

et al. 2010

Water Air Soil Pollut

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“…The precipitation of Mg(OH) 2 starts at a solution pH higher than 9.3 ( Fig.3a) and this could be an adsorbent for removing more As(V), a process similar to As(V) removal by Fe(III) hydroxide (Katsoyiannis and Zouboulis, 2002;Lenoble et al, 2005).…”

Section: Measured Precipitation Curves -Effect Of Phmentioning

confidence: 99%

“…Following the pioneering work of Nishimura and Robins (1996), ferric arsenate is considered most stable for disposal (Meng et al, 2000;Katsoyiannis and Zouboulis, 2002;Lenoble et al, 2005;Fujita et al, 2008). In plant practice, a dosage of ferric chloride or sulphate at pH < 8.5 will remove arsenic(V) in the form of a sludge, which is then filtered and disposed (Han et al, 2002;Choong et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In plant practice, a dosage of ferric chloride or sulphate at pH < 8.5 will remove arsenic(V) in the form of a sludge, which is then filtered and disposed (Han et al, 2002;Choong et al, 2007). The precipitated iron hydroxyl compounds also act as good adsorbents to produce the most stable Fe(III)-As(V) species (Katsoyiannis and Zouboulis, 2002;Lenoble et al, 2005). Ferric arsenite sulphate hydrate (6Fe 2 O 3 .5As 2 O 3 .2SO 3 .12H 2 O) is stable within the range of pH 2.0-3.5, beyond which it becomes unstable ).…”

Section: Introductionmentioning

confidence: 99%

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Selective removal of arsenic(V) from a molybdate plant liquor by precipitation of magnesium arsenate

Park¹,

Tran

Lee

et al. 2010

Hydrometallurgy

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Precipitation of Mg 3 (AsO 4 ) 2 for the removal of arsenic (As) from a molybdenum oxide processing plant liquor containing 70.9 g/L Mo(VI) and 469 mg/L As(V) was performed.. The Stabcal software was used to model the speciation and solubility equilibria, and to identify the pH conditions at which optimum precipitation can be carried out. The optimum pH range for As(V) removal is between pH 7.5 to 10.2. This avoids the need to adjust the liquor pH to affect the precipitation. By adding magnesium chloride or sulphate at a Mg:As molar ratio of at least 2:1, As(V) could be removed to less than 5 mg/L at pH 10.2 resulting in a pure Mo(VI) liquor from which a high purity product of 99.9% MoO 3 could be produced by acidification.

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“…For example, As bound by Fe/Al/Mn oxidises and oxyhydroxides are considerably more stable than the soluble-As and exchangeable-As, which are more bioaccessible under certain pH-Eh conditions and in microbe-mediated processes (Bauer and Blodau 2006;Masscheleyn et al 1991;Sarkar and Datta 2004a;Sarkar and Datta 2004b). In contrast, phosphate exchangeable-As can be released into the pore water when the levels of phosphate anions in the pore water are elevated due to its competition with arsenate for sorption sites on the iron oxides (Cao et al 2003;Lenoble et al 2005;Manning and Goldberg 1996). As a result, detailed fractionation analysis of As chemical forms has been commonly used to characterise As distribution in the solid phase of soil and tailings to assess its potential mobility and plant availability.…”

Section: Arsenic Chemical Forms In Tailings and Factors Influencing Imentioning

confidence: 99%

Effects of magnetite removal on the distribution and speciation of Arsenic in copper tailings and its accumulation in native grass

Liu¹

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Arsenic (As) is considered a significant pollutant in neutral-alkaline copper (Cu) tailings, which may be transported off site via seepage and/or runoff from tailings storage facilities. Iron (Fe) oxides and oxyhydroxides, with their high specific surface area and As affinity, play an important role adsorbing inorganic As in contaminated soil and water. In addition, organic matter (OM) and the resulting organic molecules can not only directly influence As chemical forms through competing functional groups of OM (such as phenolic, carboxyl, hydroxyls, etc.), but OM can also catalyse the transformation of Fe-primary minerals into secondary minerals such as Feoxyhydroxides via microbe-mediated processes. At the Ernest Henry Mine (North Queensland, EHM), the Cu ore processing circuit has recently been modified to recover magnetite (Fe 3 O 4 ) from tailings, which could reduce magnetite concentration in the tailings from 20-30% to as low as 3-5%. However the environmental risks of As mobility in the low magnetite (LM) tailings are yet to be investigated.The present study aimed to investigate the effects of magnetite removal and direct revegetation treatments on As distribution, solubility, and speciation in relation to plant As accumulation in the Cu-tailings. It is hypothesized that the distribution of As into exchangeable and soluble forms may be increased in the low magnetite (LM) tailings, due to the much reduced As adsorption capacity associated with the magnetite and the resultant Fe-oxyhydroxides coating on the surfaces of magnetite following redox processes. In addition, the increased distribution of As into the pore water of the LM tailings may favour As conversion from the inorganic into the organic forms under organic matter amendment and direct revegetation with native grass species. Both LM and high magnetite (HM) tailings were amended with 5% sugarcane residues as a basal treatment to ensure plant survival, in combination with 0, 1 and 5% pine-biochar, in which native grass Red Flinders (Iseilema Vaginiflorum) plants were grown for 4 weeks under glasshouse conditions. Arsenic distribution in the LM and HM tailings was fractionated before and after direct revegetation treatments.The intrinsic As adsorption capacity in the HM tailings was significantly higher than that in the LM. Following the organic matter and direct revegetation treatments, As distribution in the specifically adsorbed and amorphous Fe oxyhydroxide increased in the LM tailings but declined in the HM tailings, compared to the unamended tailings. Total As concentration in the pore water of LM tailings increased by 6-7 fold compared to those in the HM tailings. In the amended and revegetated tailings treatments, As concentrations in the pore water of the LM tailings were significantly elevated compared to those in the HM. The proportion of inorganic As species in the pore water of the LM tailings was approximately 50% higher than those in the HM.After 4 weeks of treatment, the native grass accumulated up to 137 mg kg -1 As in th...

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Arsenic removal by adsorption on iron(III) phosphate

Cited by 120 publications

References 18 publications

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Selective removal of arsenic(V) from a molybdate plant liquor by precipitation of magnesium arsenate

Effects of magnetite removal on the distribution and speciation of Arsenic in copper tailings and its accumulation in native grass

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