Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites
Samo za registrovane korisnike
2011
Autori
Marjanović, V.Lazarević, Slavica
Janković-Častvan, Ivona
Potkonjak, Branislav
Janaćković, Đorđe
Petrović, Rada
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Natural and acid-activated sepiolite samples were functionalized with (3-Mercaptopropyl)trimethoxysilane. By X-ray powder diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis it was shown that functionalization of sepiolites by grafting silane reagents occurs mainly on the surface, whereby their crystalline structure remained unchanged. The efficiency of the adsorbents in Cr(VI) removal from aqueous solutions follows the order: functionalized acid-activated sepiolite gt functionalized natural sepiolite gt acid-activated sepiolite gt natural sepiolite. As the number of silanol groups on the sepiolite surface increased during the acid activation, the silane functionalization increased and this led to an increase in Cr(VI) adsorption. The adsorption capacity strongly depended on the pH of the solution from which the adsorption occurred. Maximum Cr(VI) removal was ca. 8.0 mg Cr(VI) per g of functionalized acid-activated sepiolite at initial pH 3, wh...en the pH of solution reached 4.7, and ca. 2.7 mg Cr(VI) per g of functionalized natural sepiolite at initial pH 2, when the pH of the solution reached 2.5. Cr(VI) removal by the functionalized sepiolites was mainly attributed to electrostatic attraction between the protonated mercapto groups and the negatively charged Cr(VI) species. The sorption isotherms showed that Cr(VI) removal by both functionalized sepiolites for all initial investigated solution pH values is well described using the Dubinin-Radushkevich model. The thermodynamic data suggest spontaneity of the major physical adsorption process at 298 K.
Ključne reči:
Sepiolite / Functionalization / (3-Mercaptopropyl)trimethoxysilane / Adsorption / Chromium (VI)Izvor:
Chemical Engineering Journal, 2011, 166, 1, 198-206Izdavač:
- Elsevier Science Sa, Lausanne
Finansiranje / projekti:
- Sinteza, struktura, svojstva i primena funkcionalnih nanostrukturnih keramičkih i biokeramičkih materijala (RS-MESTD-MPN2006-2010-142070)
- EUREKA Project [4141]
DOI: 10.1016/j.cej.2010.10.062
ISSN: 1385-8947
WoS: 000287106700023
Scopus: 2-s2.0-78650310870
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Marjanović, V. AU - Lazarević, Slavica AU - Janković-Častvan, Ivona AU - Potkonjak, Branislav AU - Janaćković, Đorđe AU - Petrović, Rada PY - 2011 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1916 AB - Natural and acid-activated sepiolite samples were functionalized with (3-Mercaptopropyl)trimethoxysilane. By X-ray powder diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis it was shown that functionalization of sepiolites by grafting silane reagents occurs mainly on the surface, whereby their crystalline structure remained unchanged. The efficiency of the adsorbents in Cr(VI) removal from aqueous solutions follows the order: functionalized acid-activated sepiolite gt functionalized natural sepiolite gt acid-activated sepiolite gt natural sepiolite. As the number of silanol groups on the sepiolite surface increased during the acid activation, the silane functionalization increased and this led to an increase in Cr(VI) adsorption. The adsorption capacity strongly depended on the pH of the solution from which the adsorption occurred. Maximum Cr(VI) removal was ca. 8.0 mg Cr(VI) per g of functionalized acid-activated sepiolite at initial pH 3, when the pH of solution reached 4.7, and ca. 2.7 mg Cr(VI) per g of functionalized natural sepiolite at initial pH 2, when the pH of the solution reached 2.5. Cr(VI) removal by the functionalized sepiolites was mainly attributed to electrostatic attraction between the protonated mercapto groups and the negatively charged Cr(VI) species. The sorption isotherms showed that Cr(VI) removal by both functionalized sepiolites for all initial investigated solution pH values is well described using the Dubinin-Radushkevich model. The thermodynamic data suggest spontaneity of the major physical adsorption process at 298 K. PB - Elsevier Science Sa, Lausanne T2 - Chemical Engineering Journal T1 - Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites EP - 206 IS - 1 SP - 198 VL - 166 DO - 10.1016/j.cej.2010.10.062 ER -
@article{ author = "Marjanović, V. and Lazarević, Slavica and Janković-Častvan, Ivona and Potkonjak, Branislav and Janaćković, Đorđe and Petrović, Rada", year = "2011", abstract = "Natural and acid-activated sepiolite samples were functionalized with (3-Mercaptopropyl)trimethoxysilane. By X-ray powder diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis it was shown that functionalization of sepiolites by grafting silane reagents occurs mainly on the surface, whereby their crystalline structure remained unchanged. The efficiency of the adsorbents in Cr(VI) removal from aqueous solutions follows the order: functionalized acid-activated sepiolite gt functionalized natural sepiolite gt acid-activated sepiolite gt natural sepiolite. As the number of silanol groups on the sepiolite surface increased during the acid activation, the silane functionalization increased and this led to an increase in Cr(VI) adsorption. The adsorption capacity strongly depended on the pH of the solution from which the adsorption occurred. Maximum Cr(VI) removal was ca. 8.0 mg Cr(VI) per g of functionalized acid-activated sepiolite at initial pH 3, when the pH of solution reached 4.7, and ca. 2.7 mg Cr(VI) per g of functionalized natural sepiolite at initial pH 2, when the pH of the solution reached 2.5. Cr(VI) removal by the functionalized sepiolites was mainly attributed to electrostatic attraction between the protonated mercapto groups and the negatively charged Cr(VI) species. The sorption isotherms showed that Cr(VI) removal by both functionalized sepiolites for all initial investigated solution pH values is well described using the Dubinin-Radushkevich model. The thermodynamic data suggest spontaneity of the major physical adsorption process at 298 K.", publisher = "Elsevier Science Sa, Lausanne", journal = "Chemical Engineering Journal", title = "Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites", pages = "206-198", number = "1", volume = "166", doi = "10.1016/j.cej.2010.10.062" }
Marjanović, V., Lazarević, S., Janković-Častvan, I., Potkonjak, B., Janaćković, Đ.,& Petrović, R.. (2011). Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites. in Chemical Engineering Journal Elsevier Science Sa, Lausanne., 166(1), 198-206. https://doi.org/10.1016/j.cej.2010.10.062
Marjanović V, Lazarević S, Janković-Častvan I, Potkonjak B, Janaćković Đ, Petrović R. Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites. in Chemical Engineering Journal. 2011;166(1):198-206. doi:10.1016/j.cej.2010.10.062 .
Marjanović, V., Lazarević, Slavica, Janković-Častvan, Ivona, Potkonjak, Branislav, Janaćković, Đorđe, Petrović, Rada, "Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites" in Chemical Engineering Journal, 166, no. 1 (2011):198-206, https://doi.org/10.1016/j.cej.2010.10.062 . .