Adsorption of arsenite and arsenate within activated alumina grains: Equilibrium and kinetics

Tsair-Fuh Lin, Jun Kun Wu

Research output: Contribution to journalArticle

439 Citations (Scopus)

Abstract

Equilibrium and kinetic adsorption of tri-valent (arsenite) and penta-valent (arsenate) arsenic to activated alumina is elucidated. The properties of activated alumina, including porosity, specific surface area, and skeleton density were first measured. A batch reactor with temperature control was employed to determine both adsorption capacity and adsorption kinetics for arsenite and arsenate to activated-alumina grains. The Freundlich and Langmuir isotherm equations were then used to describe the partitioning behavior for the system at different pH. A pore diffusion model, coupled with the observed Freundlich or Langmuir isotherm equations, was used to interpret an observed experimental adsorption kinetic curve for arsenite at one specific condition. The model was found to fit with the experimental data fairly well, and pore diffusion coefficients can be extracted. The model, incorporated with the interpreted pore diffusion coefficient, was then employed to predict the experimental data for arsenite and arsenate at various conditions, including different initial arsenic concentrations, grain sizes of activated alumina, and system pHs. The model predictions were found to describe the experimental data fairly well, even though the tested conditions substantially differed from one another. The agreement among the models and experimental data indicated that the adsorption and diffusion of arsenate and arsenite can be simulated by the proposed model.

Original languageEnglish
Pages (from-to)2049-2057
Number of pages9
JournalWater Research
Volume35
Issue number8
DOIs
Publication statusPublished - 2001 Apr 19

Fingerprint

Activated alumina
arsenite
arsenate
aluminum oxide
adsorption
Adsorption
kinetics
Kinetics
Arsenic
Isotherms
arsenic
isotherm
Batch reactors
Temperature control
Specific surface area
Density (specific gravity)
skeleton
partitioning
grain size
surface area

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

Cite this

@article{15fa3090ea884fcf9f59f58d600b09ee,
title = "Adsorption of arsenite and arsenate within activated alumina grains: Equilibrium and kinetics",
abstract = "Equilibrium and kinetic adsorption of tri-valent (arsenite) and penta-valent (arsenate) arsenic to activated alumina is elucidated. The properties of activated alumina, including porosity, specific surface area, and skeleton density were first measured. A batch reactor with temperature control was employed to determine both adsorption capacity and adsorption kinetics for arsenite and arsenate to activated-alumina grains. The Freundlich and Langmuir isotherm equations were then used to describe the partitioning behavior for the system at different pH. A pore diffusion model, coupled with the observed Freundlich or Langmuir isotherm equations, was used to interpret an observed experimental adsorption kinetic curve for arsenite at one specific condition. The model was found to fit with the experimental data fairly well, and pore diffusion coefficients can be extracted. The model, incorporated with the interpreted pore diffusion coefficient, was then employed to predict the experimental data for arsenite and arsenate at various conditions, including different initial arsenic concentrations, grain sizes of activated alumina, and system pHs. The model predictions were found to describe the experimental data fairly well, even though the tested conditions substantially differed from one another. The agreement among the models and experimental data indicated that the adsorption and diffusion of arsenate and arsenite can be simulated by the proposed model.",
author = "Tsair-Fuh Lin and Wu, {Jun Kun}",
year = "2001",
month = "4",
day = "19",
doi = "10.1016/S0043-1354(00)00467-X",
language = "English",
volume = "35",
pages = "2049--2057",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier Limited",
number = "8",

}

Adsorption of arsenite and arsenate within activated alumina grains : Equilibrium and kinetics. / Lin, Tsair-Fuh; Wu, Jun Kun.

In: Water Research, Vol. 35, No. 8, 19.04.2001, p. 2049-2057.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Adsorption of arsenite and arsenate within activated alumina grains

T2 - Equilibrium and kinetics

AU - Lin, Tsair-Fuh

AU - Wu, Jun Kun

PY - 2001/4/19

Y1 - 2001/4/19

N2 - Equilibrium and kinetic adsorption of tri-valent (arsenite) and penta-valent (arsenate) arsenic to activated alumina is elucidated. The properties of activated alumina, including porosity, specific surface area, and skeleton density were first measured. A batch reactor with temperature control was employed to determine both adsorption capacity and adsorption kinetics for arsenite and arsenate to activated-alumina grains. The Freundlich and Langmuir isotherm equations were then used to describe the partitioning behavior for the system at different pH. A pore diffusion model, coupled with the observed Freundlich or Langmuir isotherm equations, was used to interpret an observed experimental adsorption kinetic curve for arsenite at one specific condition. The model was found to fit with the experimental data fairly well, and pore diffusion coefficients can be extracted. The model, incorporated with the interpreted pore diffusion coefficient, was then employed to predict the experimental data for arsenite and arsenate at various conditions, including different initial arsenic concentrations, grain sizes of activated alumina, and system pHs. The model predictions were found to describe the experimental data fairly well, even though the tested conditions substantially differed from one another. The agreement among the models and experimental data indicated that the adsorption and diffusion of arsenate and arsenite can be simulated by the proposed model.

AB - Equilibrium and kinetic adsorption of tri-valent (arsenite) and penta-valent (arsenate) arsenic to activated alumina is elucidated. The properties of activated alumina, including porosity, specific surface area, and skeleton density were first measured. A batch reactor with temperature control was employed to determine both adsorption capacity and adsorption kinetics for arsenite and arsenate to activated-alumina grains. The Freundlich and Langmuir isotherm equations were then used to describe the partitioning behavior for the system at different pH. A pore diffusion model, coupled with the observed Freundlich or Langmuir isotherm equations, was used to interpret an observed experimental adsorption kinetic curve for arsenite at one specific condition. The model was found to fit with the experimental data fairly well, and pore diffusion coefficients can be extracted. The model, incorporated with the interpreted pore diffusion coefficient, was then employed to predict the experimental data for arsenite and arsenate at various conditions, including different initial arsenic concentrations, grain sizes of activated alumina, and system pHs. The model predictions were found to describe the experimental data fairly well, even though the tested conditions substantially differed from one another. The agreement among the models and experimental data indicated that the adsorption and diffusion of arsenate and arsenite can be simulated by the proposed model.

UR - http://www.scopus.com/inward/record.url?scp=0035065060&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035065060&partnerID=8YFLogxK

U2 - 10.1016/S0043-1354(00)00467-X

DO - 10.1016/S0043-1354(00)00467-X

M3 - Article

C2 - 11337853

AN - SCOPUS:0035065060

VL - 35

SP - 2049

EP - 2057

JO - Water Research

JF - Water Research

SN - 0043-1354

IS - 8

ER -