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- Title
Comparison of selenate and selenite adsorption from aqueous solutions on the mesoporous goethite: kinetics, equilibrium and mechanism.
- Authors
Shifeng Li; Feng Lu; Shuhua Yao; Shuyan Zang
- Abstract
The mesoporous goethite synthesized by the hydrothermal method was employed to remove selenate (Se(VI)) and selenite (Se(IV)) from wastewater. The adsorption data of kinetics and isotherms were determined and fitted with different models, and the potential adsorption mechanism was discussed according to X-ray photoelectron spectroscopy (XPS) analysis. The maximum adsorption capacities of Se(IV) and Se(VI) on the mesoporous goethite are 71.07 and 21.07 mg/g at 25°C, respectively, which are about two orders of magnitude higher than the natural goethite. The XPS results revealed that the Se(IV) was adsorbed on the surface of the mesoporous by the formation of the inner-sphere complex, but the outer-sphere complexes are formed with Se(IV). The mesoporous goethite is expected to be a potential adsorbent for Se removal from industrial selenium-containing wastewater on a large scale for its properties of easy-preparation and less cost compared with classic nanomaterials.
- Subjects
GOETHITE; ADSORPTION kinetics; ADSORPTION capacity; AQUEOUS solutions; X-ray photoelectron spectroscopy; SEWAGE; ADSORPTION (Chemistry)
- Publication
Desalination & Water Treatment, 2021, Vol 218, p220
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.26938