Authors:E. Yörükoğulları, G. Yılmaz, and S. Dikmen
In this study, the zeolitic tuffs having clinoptilolite obtained from Bigadic region of western of Anatolia, Turkey were investigated
as regards to whether it is possible to be transformed into amorphous phase from them. At first, the zeolite tuffs rich in
clinoptilolite were characterized using XRD, DTA, TG, DSC, and FTIR standard methods. All the samples were heated at 110 °C
for 2 h and then were expanded within 5 min between the temperatures 1200 and 1400 °C. In addition, porosity and density were
determined. The resistance values of all the samples were measured in acidic and basic media. These samples were also analyzed.
As a result of this study, zeolitic tuffs in clinoptilolite were transformed into amorphous phase, and especially in chemical
industry were found convenient.
Authors:B. Egrdoğan Alver, M. Sakici, E. Yörükoğullari, Y. Yilmaz, and M. Güven
The water adsorption properties of sepiolite having dolomite supplied from Eskisehir region and their exchanged forms (K+, Na+, Mg2+ and Ca2+) were investigated. The sepiolite samples were characterized using XRD, TG-DTA, DSC and nitrogen adsorption methods. The
temperature ranges were determined for the dehydrations of hydroscopic and zeolitic water as 30–200°C, for the dehydration
of the bound water as 250–750°C and for the dehydroxylation of hydroxyls as 810–850°C in the sample. It was observed that
the value of percent mass loss for natural and modified samples varied in the range from 36.70 to 39.05%. Two mass loss steps
for all samples were observed using a differential scanning calorimetry (DSC) in the range of 30–550°C. Adsorption isotherms
for water on natural and modified forms were obtained at pressures up to 2.39 kPa. Uptake of water increased as K-SEP.<Na-SEP.<Mg-SEP.<Ca-SEP.
for sepiolite samples at 293 K.