TiO₂-Based Sorbent of Lead Ions

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• 作者：Jana Seidlerová ; ^a ; Ivo &Scaron ; afaří ; k^b ; Lucia Rozumová ; ^a ; Mirka &Scaron ; afaří ; ková ; ^b ; Oldřich Motyka^a ; ^{oldrich.motyka@vsb.cz" class="auth_mail" title="E-mail the corresponding author}
• 关键词：TiO2 ; sorption ; lead ions
• 刊名：Procedia Materials Science
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：12
• 期：Complete
• 页码：147-152
• 全文大小：189 K

文摘

The non-magnetic TiO₂ powder and magnetically modified TiO₂ powder were employed for the sorption experiments. FeSO₄.7H₂O was used for synthesis of magnetically responsive TiO₂. The non-magnetic and prepared magnetic materials were characterized by scanning electron microscopy and X-ray diffraction methods. The particle size and specific surface area were determined. A detailed study of the adsorption process performed using batch adsorption experiments was carried out with various concentrations of lead ions and contact time. A flame atomic absorption spectrometer was used for determination of Pb²⁺ ions concentration in solution. Adsorption process has been modeled by the Langmuir and Freundlich isotherms using linear and non-linear regression. The results showed that the adsorption of Pb²⁺ ions on the magnetic and non-magnetic TiO₂ particles occurred in a monolayer. Presence of magnetic iron oxides particles on the surface of sorbents increased the adsorption rate, and increased the maximum amount of adsorbed Pb²⁺ ions per mass in comparison with adsorption on the non-magnetic TiO₂ particles. The magnetically modified TiO₂ particles allow magnetic separation of the sorbents with already adsorbed ions of pollutants.