Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 197, Issue -, Pages 92-100Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2014.06.008
Keywords
Clinoptilolite; EXAFS; TEM; Selenium; Mushroom
Categories
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [172018]
- Slovenian Research Agency [P1-0112]
- ELETTRA (beamline XAFS, project) [20115112]
Ask authors/readers for more resources
Se(IV) and Se(VI) anions are the dominant species of Se existing in aqueous systems. In this study, the iron(III)-modified natural zeolitic tuff (Fe-CLI) from the Serbian deposit Zlatokop has been investigated as an adsorbent for the Se oxyanions. Fe-CLI shows adsorption activity for both Se(IV) and Se(VI) which decreases with increasing pH. The adsorption capacity of Fe-CLI is found to be higher for Se(IV) than for Se(VI). Kinetics data follow the pseudo-second-order model and the obtained parameters k indicate that the rates of adsorption and desorption are higher for Se(VI). Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) analyses reveal that Se is bound at the zeolite surface forming not only the Se-O-Fe but also Se-O-Si bonds. The adsorption mechanism depends of the type of oxo ions. Samples of zeolitic tuff which contain Se were tested as soil supplements for the cultivation of Pleurotus ostreatus mushrooms. The fungus adsorbed the inorganic Se from zeolitic tuff transforming it to a more valuable organically bound form. (C) 2014 Published by Elsevier Inc.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available