US EPA

157845 

Journal Article 

Adsorption of arsenate and arsenite on titanium dioxide suspensions 

Dutta, PK; Ray, AK; Sharma, VK; Millero, FJ 

2004 

Yes 

Journal of Colloid and Interface Science
ISSN: 0021-9797
EISSN: 1095-7103 

278 

2 

270-275 

English 

15450443 

10.1016/j.jcis.2004.06.015 

WOS:000224287100003 

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. 

Arsenate; Arsenite; Titanium dioxide; Adsorption; Point of zero charge; Isotherms