Adsorption of arsenate and arsenite on titanium dioxide suspensions
Abstract
Adsorption of arsenate (As(V)) and arsenite (As(III)) to two commercially available titanium dioxide (TiO2) suspensions, Hombikat UV100 and Degussa P25, was investigated as a function of pH and initial concentration of adsorbate ions. The BET surface area and zeta potential values of TiO2 were also measured to understand the difference in adsorption behavior of two suspensions. Both As(V) and As(III) adsorb more onto Hombikat UV100 particles than Degussa P25 particles. Adsorption of As(V) onto TiO2 suspensions was more than As(III) at pH 4 while the adsorption capacity of As(III) was more at pH 9. The electrostatic factors between surface charge of TiO2 particles and arsenic species were used to explain adsorption behavior of As(V) and As(III) at different pH. The Langmuir and Freundlich isotherm equations were used to interpret the nature of adsorption of arsenic onto TiO2 suspensions. The usefulness of adsorption data in removing arsenic in water is briefly discussed.
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The reaction is very fast for permanganate, chlorine, and ozone compared to hydrogen peroxide and chloramine when applied for oxidation of AsIII to AsV.
“The reaction is very fast for permanganate, chlorine, and ozone as compared to hydrogen peroxide and chloramine when applied for oxidation of AsIII to AsV [142–144].”
From Arsenic Contamination of Groundwater: A Review of Sources, Prevalence, Health Risks, and Strategies for Mitigation (2014) · cites this paper as [144]
Presence of interfering substances such as Fe(II), Mn(II), sulfide, total organic carbon, and dissolved organic carbon affect the oxidation of AsIII in water samples; in the presence of S2− and TOC, the oxidation rate of AsIII by ozone severely declines.
“Presence of interfering substances such as Fe(II), Mn(II), sulfide (HS− and S2−), total organic carbon (TOC), and dissolved organic carbon affect the oxidation of AsIII in water samples. In the presence of S2- and TOC, the oxidation rate of AsIII by ozone severely declines [144].”
From Arsenic Contamination of Groundwater: A Review of Sources, Prevalence, Health Risks, and Strategies for Mitigation (2014) · cites this paper as [144]
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“In addition, oxidation of AsIII to AsV by photocatalytic oxidation and TiO 2 followed by adsorption of As on TiO 2 has also been investigated [149, 150].”
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- Authors
- Dutta, P. K., Ray, A. K., Sharma, V. K., & Millero, F. J.
- Affiliations
- National University of Singapore (SG)
- Florida Institute of Technology (US)
- University of Miami (US)
- Corresponding author
- Sharma, Virender K.
- Venue
- Journal of Colloid and Interface Science
- Publisher
- Elsevier BV
- Published
- 2004-10
- Volume
- 278
- Issue
- 2
- Pages
- 270-275
- ISSN
- 0021-9797 (ISSN-L)
- OpenAlex
- W2099757444
- Cited by
- 415
- References
- 0
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 6 · 2023: 12 · 2022: 13 · 2021: 21 · 2020: 29 · 2019: 31 · 2018: 21 · 2017: 28 · 2016: 27 · 2015: 28 · 2014: 27 · 2013: 22 · 2012: 26
- FWCI
- 10.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Colloid and Interface Science (publishedVersion)
- PubMed (publishedVersion)
- National University of Singapore (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Keywords
- arsenate adsorption, arsenite adsorption, titanium dioxide, P25 TiO2, pH effect, zeta potential, Langmuir isotherm, Freundlich isotherm, electrostatic interactions, arsenic removal from water, adsorption isotherms
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