Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

Ghosh, Munmun; Yuan, Jill R.

doi:10.1002/ep.670060325

Cited by 137 publications

(75 citation statements)

References 10 publications

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“…Also, both intrinsic and columbic interaction could interact at the same time. Again, the transfer of a proton to the hydroxyl groups on the surface of the adsorbent is also possible (Ghosh and Yuan, 1987). Specific adsorption (ligand exchange mechanism) or chemisorptions of As on Fe-oxide/hydroxide surfaces has been reported as taking place by this method (Sadiq, 1997).…”

Section: Resultsmentioning

confidence: 96%

Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber

Igwe

Abia

Ibeh

2007

Int. J. Environ. Sci. Technol.

129

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ABSTRACT:As, Hg and Pb are examples of heavy metals which are present in different types of industrial effluents responsible for environmental pollution. Their removal is traditionally made by chemical precipitation, ion-exchange and so on. However, this is expensive and not completely feasible to reduce their concentrations to the levels as low as required by the environmental legislation. Biosorption is a process in which solids of natural origin are employed for binding the heavy metal. It is a promising alternative method to treat industrial effluents, mainly because of its low cost and high metal binding capacity. The kinetics was studied for biosorption experiments using coconut fiber for As (III), Hg (II) and Pb (II) ions adsorption. The specific surface area and surface charge density of the coconut fiber are 1.186x10 25 (m 2 /g) and 5.39 x10 24 (meq/m 2 ), respectively. The maximum adsorption capacity was found to be the highest for Pb (II) followed by Hg (II) and As (III). The modification of the adsorbent by thiolation affected the adsorption capacity. Equilibrium sorption was reached for the metal ions at about 60 min. The equilibrium constant and free energy of the adsorption at 30 ºC were calculated. The mechanism of sorption was found to obey the particlediffusion model. The kinetic studies showed that the sorption rates could be described by both pseudo first-order and pseudo second-order models. The pseudo second-order model showed a better fit with a rate constant value of 1.16 x 10 -4 /min. for all three metal ions. Therefore, the results of this study show that coconut fiber, both modified and unmodified, is an efficient adsorbent for the removal of toxic and valuable metals from industrial effluents. Key words: Adsorption kinetics, intraparticulate diffusivity, heavy metal, coconut fiber, waste management INTRODUCTIONAs, Hg and Pb have detrimental effects on human, plants and animals. The toxicity of these heavy metals to marine life and consequently to man has been established for many years. The sources of As pollution come from discharges of various industries, such as smelting, petroleum-refining, pesticides, herbicide, glass and ceramic manufacturing industries (Volesky and Holan, 1995). Pb pollution particularly results from battery manufacturing, automobile exhaust fumes and metal finishing industries. Hg pollution results from metallurgical industries, chemical manufacturing and metal finishing industries. Other sources of these heavy metals also exist and these have increased as a result of an increase in urbanization and industrialization. The chemistry of these heavy metals is complex and interesting,

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Section: Resultsmentioning

confidence: 96%

Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber

Igwe

Abia

Ibeh

2007

Int. J. Environ. Sci. Technol.

129

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“…In addition, methylated arsenic species can occur in natural waters as the result of either disposal of organoarsenical compounds or biotransformation of inorganic arsenic. Methyl arsonic acid [CH 3 As(O)(OH) 2 ; pK a1 = 3.41, pK a2 = 8.18] and dimethyl arsinic acid [(CH 3 ) 2 As(O)OH; pK a1 = 1.56] are the most commonly occurring organoarsenical compounds in natural waters (15) and, as ionizable compounds, may also be sequestered by sorption onto oxide minerals (16).…”

Section: Biogeochemical Cycling Of Arsenicmentioning

confidence: 99%

Remediating Subsurface Arsenic Contamination with Monitored Natural Attenuation

Reisinger¹,

Burris²,

Hering³

2005

Environ. Sci. Technol.

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“…Some bacteria and fungi can produce MMA and DMA through the methylation of inorganic As [7]. Furthermore, MMA and DMA can be introduced into the environment through agricultural activities [8] with both used as herbicides and pesticides over the past several decades [7,9]. Although inorganic As has long been considered more toxic than organic As [10], some methylated As, such as MMA(III), is reportedly much more toxic than inorganic As [11].…”

Section: Introductionmentioning

confidence: 99%

Coagulation of methylated arsenic from drinking water: Influence of methyl substitution

Chen

Liu

et al. 2015

Journal of Hazardous Materials

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Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

Abstract: Spent alumina beds can be successfully regenerated using 0.5% NaOH followed by dilute acid rinse.

Cited by 137 publications

References 10 publications

Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber

Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber

Remediating Subsurface Arsenic Contamination with Monitored Natural Attenuation

Coagulation of methylated arsenic from drinking water: Influence of methyl substitution

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