Effects of Cerium, Iron and Copper Incorporation on the Structural Properties and Activities of Ti-Pillared Bentonites
Abstract
Ti-pillared
bentonite (Ti-PB) using bentonite from the Middle Anatolia region
(Hançılı) was synthesized. Iron or copper was impregnated to Ti-PB from the solution and subsequent cerium
incorporation was done by wet impregnation. The hydrothermal syntheses were carried out with a Cu/(Cu+Ti)
ratios of 0.1
and 0.2. The anatase phase of titanium dioxide was found for all of
the samples. The Ti-PB calcined at 500
°C gave a basal spacing value of 4.41 nm, a specific BET surface area of 348 m2
g-1, and a micropore volume of 0.093 cm3g-1. While the post
incorporation of copper and iron caused decrease in the micropore properties,
the hydrothermally synthesized copper titanium samples reflected the similar
behavior with Ti-PB. Energy dispersive X-ray spectroscopy (EDS) analyses
indicated that TiO2 content of all PBs was near 40 wt % and metal
incorporation to Ti-PB was succesfully performed by the impregnation method. Ti-PB exhibited both
the Lewis and Brønsted acidities. The copper impregnation resulted in an increase in the Lewis
acidity. The hydrotermally synthesised copper containing
sample and cerium-iron and cerium-copper impregnated samples yielded an
increase in the Brønsted acidity. Approximately 90 % phenol conversion at 30 °C in an hour was achived with the cerium and iron containing sample and the completion of photocatalytic
oxidation was reached at 2 hours. An increase of temperature rised the
conversion of phenol, and the iron
containing sample resulted in approximately 100 % conversion at an hour at 50
°C. Hydroquinone, benzoquinone and catechol and
formic, malic, fumaric acids were observed as the reaction intermediates. The
leaching of metals was observed at low values and the stability of iron was
found six times higher than the copper.
Keywords
References
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Details
Primary Language
English
Subjects
-
Journal Section
Research Article
Authors
Funda Turgut Başoğlu
Gazi University
Türkiye
Publication Date
June 29, 2018
Submission Date
October 13, 2017
Acceptance Date
April 27, 2018
Published in Issue
Year 2018 Volume: 39 Number: 2
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