On the mechanistic modeling of As(III) adsorption on gibbsite

Weerasooriya, Rohan; Tobschall, H. J.; Wijesekara, Hasintha; Arachchige, E.K.I.A.U.K.; Pathirathne, K.A.S.

doi:10.1016/s0045-6535(03)00157-7

Cited by 55 publications

(49 citation statements)

References 27 publications

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“…Similar results have also been reported for the sorption of antimony on metal-loaded saponified orange waste, goethite (α-FeOOH) and activated alumina (Duarte, Ciminelli, Dantas, Duarte, Vasconcelos, Oliveira, & Osseo-Asare, 2012;Weerasooriya, Tobschall, Wijesekara, Arachchige, & Pathirathne, 2003).…”

Section: Removal Of Sb 3+ As a Function Of Phsupporting

confidence: 87%

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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Section: Removal Of Sb 3+ As a Function Of Phsupporting

confidence: 87%

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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“…For thioarsenites, H 2 AsS 3 − and HAsS 3 2 − are the dominative species in near neutral pH ranges from ambient temperature to 573 K. The structure and acidity data can be used in future experimental and modeling studies, e.g., As speciation in geothermal fluids and surface complexation of As-moieties on mineral surfaces. For example, adsorption of As-containing species on mineral surfaces are pHdependent, and As speciation at a certain pH is a fundamental parameter for surface complexation modeling (Weerasooriya et al, 2003). Furthermore, the atomic level structures are useful for atomistic simulations of interactions between As-moieties and mineral surfaces (Watts et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Structures and acidity constants of arsenite and thioarsenite species in hydrothermal solutions

Liu

et al. 2015

Chemical Geology

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“…Rodrigues-Filho and Maddock (1997) and Rodrigues-Filho et al (2002), e.g., report the importance of gibbsite in Hg adsorption processes in fluvial and lake systems, decreasing Hg bioavailability. Weerasooriya et al (2003) also describe some arsenic adsorption mechanisms on gibbsite, under different physical-chemical conditions, suggesting that such mineral may play a vital role in the mobility processes, especially under basic pH values.…”

Section: Mineralogical Characterizationmentioning

confidence: 99%

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

et al. 2010

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Mercury, zinc and copper contamination was evaluated in soils and fluvial sediments from an abandoned gold mining site at Descoberto Municipality (southern Minas Gerais State, Brazil). Metals bioavailability and potential mobility were studied through physical, chemical and mineralogical characterization, geoaccumulation indexes calculations, mercury speciation and determination of potentially bioavailable contents of zinc and copper. Values of pH were in the neutral range, while organic matter concentrations were very low. Mineralogical characterization, in the total samples, indicated the presence of quartz, kaolinite and gibbsite for all samples. Total mercury, zinc and cooper concentrations were higher than the limits recommended by Brazilian documents. Geoaccumulations indexes revealed that most of the sediment samples were low to moderately polluted by zinc and copper, while just one sample was very strongly polluted by mercury. Mercury speciation revealed the predominance of the elementary form for all samples, and low concentrations for exchangeable, strongly bound and residual fractions. Zinc and copper behavior was strongly controlled by iron and aluminum concentrations, while their bioavailable contents were very low in comparison with the total concentrations.

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On the mechanistic modeling of As(III) adsorption on gibbsite

Cited by 55 publications

References 27 publications

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

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

Structures and acidity constants of arsenite and thioarsenite species in hydrothermal solutions

Mercury, copper and zinc contamination in soils and fluvial sediments from an abandoned gold mining area in southern Minas Gerais State, Brazil

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