Natural Red Earth as a low cost material for arsenic removal: Kinetics and the effect of competing ions

Rajapaksha, Anushka Upamali; Vithanage, Meththika; Jayarathna, Lakmal; Kumara, Chanaka

doi:10.1016/j.apgeochem.2011.01.021

Cited by 36 publications

(22 citation statements)

References 33 publications

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“…Oxyanions of As(V) and As(III) were bound Figure 8-Proposed mechanism of As(III) adsorption/oxidation and As(V) adsorption by NIMZ. t ot h eF e -o x i d em i n e r a l si nN I M Zb yf o r m i n gi n n e r -s p h e r e complexes (Manning et al, 2002;Wang and Mulligan, 2008), in which the -OH groups in As(III) or As(V) exchanged with the S-OH group that was directly coordinated to structural Fe(III) (Rajapaksha et al, 2011). The inner-sphere surface c o m p l e x e so fA s ( I I I )a n dA s ( V )f o r m e do nt h eF e -o x i d e surfaces can be attributed to the monodentate mononuclear and bidentate binuclear inner-sphere complexes (Manning et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

Adsorption/Oxidation of Arsenic in Groundwater by Nanoscale Fe‐Mn Binary Oxides Loaded on Zeolite

Kong¹,

Wang²,

Zhan³

et al. 2014

Water Environment Research

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Nanoscale Fe-Mn binary oxides loaded on zeolite (NIMZ) is synthesized and characterized. The as-synthesized adsorbent is amorphous with 126 m2/g surface area; it is effective for the adsorption of both As(III) and As(V) in synthetic groundwater. It has high adsorption capacities of 296.23 and 201.10 mg/g for As(III) and As(V), respectively. For the adsorption of 2 mg/L arsenic, the aqueous concentration quickly decreases to less than 10 /microg/L within 30 min. During the adsorption of As(III), the in-aqueous measurement of As(V) shows a low concentration in the initial stage and disappears afterward. The fraction of As(V) on NIMZ gradually increases with time, proving the oxidation of As(III). The adsorption of As(III) and As(V) decreases with increasing pH. The anions of SiO3(2-), H2PO4(-), and HCO3(-) significantly compete with arsenic for the adsorption sites. The innersphere surface complexes are formed by As(III) or As(V) with the hydroxyl groups on the surface of NIMZ.

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Section: Resultsmentioning

confidence: 99%

Adsorption/Oxidation of Arsenic in Groundwater by Nanoscale Fe‐Mn Binary Oxides Loaded on Zeolite

Kong¹,

Wang²,

Zhan³

et al. 2014

Water Environment Research

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“…Briefly, the dried BM was pyrolyzed at 300°C and at 700°C under a limited supply of air, at the rate of 7°C min -1 for 3 h. Samples of NRE were collected from northwestern Sri Lanka (8°14 0 50 00 N and 79°45 0 45 00 E). The silica grains of the NRE were completely covered by amorphous coating with variable charge sites of [AlOH and [FeOH, showing a strong affinity for heavy metals, and it has previously been used to immobilize heavy metals and metalloids, including As, Pb, and Sb (Almaroai et al 2014;Vithanage et al 2013;Rajapaksha et al 2011). The GINP was synthesized using 1 M AlCl 3 and 6 M NaOH at pH 4.6 following the method described by Kumara et al (2010).…”

Section: Soil Amendments and Incubation Experimentsmentioning

confidence: 99%

The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil

Rajapaksha

Ahmad

Vithanage

et al. 2015

Environ Geochem Health

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102

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High concentration of toxic metals in military shooting range soils poses a significant environmental concern due to the potential release of metals, such as Pb, Cu, and Sb, and hence requires remediation. The current study examined the effectiveness of buffalo weed (Ambrosia trifida L.) biomass and its derived biochars at pyrolytic temperatures of 300 and 700 °C, natural iron oxides (NRE), gibbsite, and silver nanoparticles on metal immobilization together with soil quality after 1-year soil incubation. Destructive (e.g., chemical extractions) and non-destructive (e.g., molecular spectroscopy) methods were used to investigate the immobilization efficacy of each amendment on Pb, Cu, and Sb, and to explore the possible immobilization mechanisms. The highest immobilization efficacy was observed with biochar produced at 300 °C, showing the maximum decreases of bioavailability by 94 and 70% for Pb and Cu, respectively, which were attributed to the abundance of functional groups in the biochar. Biochar significantly increased the soil pH, cation exchange capacity, and P contents. Indeed, the scanning electron microscopic elemental dot mapping and X-ray absorption fine structure spectroscopic (EXAFS) studies revealed associations of Pb with P (i.e., the formation of stable chloropyromorphite [Pb5(PO4)3Cl]) in the biomass- or biochar-amended soils. However, no amendment was effective on Sb immobilization.

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“…[ Based on previous studies, suggested mechanism of adsorption for arsenate is a formation of inner sphere complexes on the surface of Fe(III) oxyhydroxides. [39,45] Rajapaksha et al [39] suggested formation of a bidentate binuclear-bridging complex, but monodentate complex was suggested in the presence of phosphate.…”

Section: Sequestration Of Arsenic By Soils For Drinking Water Productionmentioning

confidence: 98%

Arsenic removal from groundwater of the Chaco-Pampean Plain (Argentina) using natural geological materials as adsorbents

Bundschuh

Bhattacharya

Šráček

et al. 2011

Journal of Environmental Science and Health, Part A

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Use of natural geological materials for arsenic (As) removal is an emerging solution at a household level for poor people in remote rural settlements, especially when the materials are locally available and can be collected by the local population. Their low or zero cost makes these materials very attractive compared with synthetic or commercial materials. Sometimes, this may be the only option to provide safe water to very poor settlements. Their suitability for As removal from water is mainly due to adsorption, co-precipitation and ion exchange processes involving Fe- and Al-rich minerals and clay minerals present in the soils or sediments. In the present study, various clay-rich soils from the Santiago del Estero province (SDE, NW Argentina) and, for comparison, a laterite from the Misiones province have been tested as adsorbents for As in shallow naturally contaminated groundwaters of the Río Dulce alluvial aquifer in SDE. Batch adsorption experiments showed higher As(V) removal for the Misiones laterite sample (99 %) as compared with the soils from SDE (40-53 %), which can be related to lower contents of water-soluble and oxalate extractable Al and Fe in the last samples. These results suggest the application of the Misiones laterite soil as an alternative for As removal. However, high transportation costs from Misiones to SDE can be an economical restriction for the low-income population of SDE.

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Natural Red Earth as a low cost material for arsenic removal: Kinetics and the effect of competing ions

Cited by 36 publications

References 33 publications

Adsorption/Oxidation of Arsenic in Groundwater by Nanoscale Fe‐Mn Binary Oxides Loaded on Zeolite

Adsorption/Oxidation of Arsenic in Groundwater by Nanoscale Fe‐Mn Binary Oxides Loaded on Zeolite

The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil

Arsenic removal from groundwater of the Chaco-Pampean Plain (Argentina) using natural geological materials as adsorbents

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