Adsorption of antimony(III) and antimony(V) on bentonite: Kinetics, thermodynamics and anion competition

Xi, Jianchao; He, Mengchang; Lin, Chunye

doi:10.1016/j.microc.2010.05.017

Cited by 204 publications

(97 citation statements)

References 39 publications

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“…They reported that 1 mol L −1 initial concentrations of NO 3 , acetate, and Cl reduced the retention of Sb(V) by <10% from a 0.16 mol L −1 Sb(V) solution, whereas PO 4 and SO 4 reduced Sb(V) adsorption by >60%. Xi et al (2010a) observed Sb(V) retention by kaolinite to decrease from an adsorption maximum in pH 3.6 to a minimum in pH 9.2 suspensions. They also observed Sb(V) retention to decrease with increasing ionic strength [controlled by Ca(NO 3 ) 2 at pH 6].…”

mentioning

confidence: 83%

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Essington

Stewart

2016

Soil Science Soc of Amer J

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Antimony (sb) is a potential environmental contaminant of emerging concern that occurs in soils in the sb(V) oxidation state as the antimonate species sb(OH) 6 -. In soils, metal oxyhydroxides play an important role in the immobilization of contaminants and in restricting bioaccessibility. One such mineral is gibbsite, which bears the reactive aluminol surface functional group. Both inner-and outer-sphere surface complexation mechanisms have been inferred from conflicting sb(V) adsorption findings involving aluminol-bearing minerals. The objectives of this research are to characterize sb(V) adsorption by gibbsite and to use the macroscopic findings to develop mechanistic adsorption models. Antimonate adsorption envelopes were developed using two equilibrium techniques: continuous pH titration and batch. The adsorption of sb(V) decreases with increasing pH and increasing ionic strength, suggesting that outer-sphere surface complexation is an important adsorption mechanism. However, sb(V) retention is irreversible at pH <6 but is reversible in pH >7 systems, suggesting that inner-sphere species may be significant in acidic environments. Adsorbed sb(V) also generates a downward shift in the gibbsite isoelectric point, further supporting the formation of inner-sphere sb(V) surface complexes. Both PO 4 and sO 4 decrease adsorbed sb(V) concentrations: PO 4 throughout the pH 3 to 10 range and sO 4 in pH <7 systems. The triple-layer surface complexation model successfully predicts sb(V) adsorption by using both outer-sphere and inner-sphere surface species. The triple-layer model also predicts ligand adsorption in the competitive systems without the need for reoptimization.Abbreviations: BET, Brunauer-Emmett-Teller; ICP-AES, inductively coupled argon plasma-atomic emission spectroscopy; IEP, isoelectric point; SCM, surface complexation model; TLM, triple layer model; XRD, x-ray diffraction.A ntimony is one of the least abundant elements in soils, having a median concentration in uncontaminated soils from around the world of 1 mg kg −1 (range, <0.2-10 mg kg −1 ) (Bowen, 1979;Filella et al., 2002;Helmke, 2000). However, anthropogenic activities can result in elevated soil Sb levels (Crecelius et al., 1975;Filella et al., 2002;Li and Thornton, 1993;Nriagu, 1989;Nriagu and Pacyna, 1988;Scheinost et al., 2006). Soils that are particularly affected by Sb are those at military and civilian shooting ranges. Antimony is a hardening agent in lead bullets, which contain ~5% Sb (Carlin, 2000;Johnson et al., 2005;Kilgour et al., 2008). As bullets and bullet fragments corrode, Pb and Sb are released to the soil environment (Clausen and Korte, 2009;Kilgour et al., 2008). The resulting Sb concentrations can far exceed native soil levels. Antimony concentrations in military and civilian shooting range soils have been reported to range from <517 to <17,500 mg kg −1 (Basunia and Landsberger, 2001;Johnson et al., 2005;Kilgour et al., 2008;Knechtenhofer et al., 2003;Mitsunobu et al., 2006;Okkenhaug et al., 2013;Spuller et al., 2007), alth...

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confidence: 83%

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Essington

Stewart

2016

Soil Science Soc of Amer J

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“…Sorption experiments of Sb(III) and Sb(V) onto Fe oxides (e.g., goethite) and clays (e.g., bentonite) indicated that the sorption process is fast. It is suggested that 24 h is sufficient time to reach sorption equilibrium of Sb(III) and a similar tendency is characteristic also for Sb(V) [32,39].…”

Section: Sorption Kinetics Study Of Metalloidsmentioning

confidence: 76%

“…Whereas predominant form of Sb(V) at pH interval 2-11 is Sb(OH) 6 − (Van Vleek et al 2011; Xi et al 2011). The highest sorption capacity of the studied sorbents sorbing Sb(III) was at the pH interval 6-9 where the predominant form is neutral Sb(III).…”

Section: Impact Of Ph On Sorption Of Metalloidsmentioning

confidence: 99%

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Ansone-Bertina

Kļaviņš

2016

Open Chemistry

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Abstract:The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5-9 and for As(V) and Sb(V) -3-6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3-9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.Keywords: peat, sorbents, arsenic, antimony, tellurium, metalloids Environmental contextGrowing attention is being paid to environmental pollution with metalloids (As, Sb, Te) requiring new approaches for removal of these elements from water. The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. Iron modified peat has high sorption capacity in respect to all environmentally relevant metalloid speciation forms [As(V), As(III), As(org.), Sb(III), Sb(V), Te(IV) and Te(VI)]. The sorption takes place according to mechanisms of physical sorption and is affected by pH of a solution as well as competing ions.

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“…The present remediation methodology has not yet been reported for the removal of Sb 3+ , (SbO 3 ) 3-and to the best of our knowledge, the lowest detection limit of 1 g/m 3 has been reported by Xi, He & Lin (2011) using bentonite.…”

mentioning

confidence: 78%

Characterization of Montmorillonite Biocomposite and Its Application for Trace Level Removal of Sb3+: Equilibrium and Kinetic Studies

Anjum¹,

Seth²,

Datta³

2014

IJC

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The effluent from various industries is the potential source of water contamination during last few decades. Thus effective methods have been adopted for the removal of toxic heavy metals from industrial effluents that show carcinogenic and mutagenic effects. The present research involves removal of Sb 3+ that has been investigated using chitosan-montmorillonite biocomposites. The kinetics and adsorption equilibrium was determined respectively using batch adsorption model, taking into account solution pH, contact time and initial metal ion concentration. The adsorption isotherm parameters were evaluated wherein Freundlich model best represents the experimental data. The highest adsorption capacity of 48.7 mg/g of chitosan-montmorillonite beads was attained from an initial concentration of 100 g/m 3 at 300 K. The equilibrium was achieved during initial phase of contact of 10 minutes only. The biosorbent show comparable high adsorption capacity for Sb 3+ and is efficiently functional in broad range of metal ion concentration from 4 mg/m 3 (4 parts per billion) to 100 g/m 3 (100 parts per million) of solution. The adsorption kinetics follows chemical adsorption as the rate determining step. The interaction forces between Sb3+ and adsorbent/s were determined by Fourier Transform Infrared-Attenuated Total Reflectance (FT-IR-ATR). The metal ion desorption and reusability of biosorbent/s up to three cycles was supported by 0.1 M potassium dihydrogen phosphate solution. The Scanning Electron Micrographs and X-Ray Diffractograms of the adsorbents before and after metal interaction were found to correspond to the batch adsorption studies of the metal ion.

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Adsorption of antimony(III) and antimony(V) on bentonite: Kinetics, thermodynamics and anion competition

Cited by 204 publications

References 39 publications

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Characterization of Montmorillonite Biocomposite and Its Application for Trace Level Removal of Sb3+: Equilibrium and Kinetic Studies

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