Energy of rehydration of natural clinoptilolite and its lithium form as a function of the dehydration temperature

1989 ◽  
Vol 38 (11) ◽  
pp. 2211-2213
Author(s):  
M. M. Dubinin ◽  
A. A. Isirikyan ◽  
E. V. Kobaladze ◽  
G. V. Tsitsishvili
Keyword(s):  
Natural Clinoptilolite ◽  
Lithium Form

scholarly journals Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

2021 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
Muhammad Yusuf Prajitno ◽  
Mohamad Taufiqurrakhman ◽  
David Harbottle ◽  
Timothy N. Hunter
Keyword(s):  
Adsorption Capacity ◽  
Tubular Reactor ◽  
Process Intensification ◽  
Kinetic Studies ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Batch Studies ◽  
Shear Mixing ◽  
Natural Clinoptilolite ◽  
Kinetics Of

Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

Removal of Mg from spring water using natural clinoptilolite

Clay Minerals ◽  
2012 ◽  
Vol 47 (1) ◽  
pp. 81-92 ◽  
Author(s):  
S. Tomić ◽  
N. Rajić ◽  
J. Hrenović ◽  
D. Povrenović
Keyword(s):  
Ion Exchange ◽  
Kinetic Studies ◽  
Spring Water ◽  
Zeolite A ◽  
Zeolitic Tuff ◽  
Rate Limiting Step ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Natural Clinoptilolite ◽  
Rate Limiting

AbstractNatural zeolitic tuff from Brus (Serbia) consisting mostly of clinoptilolite (about 90%) has been investigated for the reduction of the Mg concentration in spring water. The sorption capacity of the zeolite is relatively low (about 2.5 mg Mg g-1for the initial concentration of 100 mg Mg dm-3). The zeolitic tuff removes Mg from water solutions by ion exchange, which has been demonstrated by energy dispersive X-ray analysis (EDS). The extent of ion exchange was influenced by the pH and the initial Mg concentration. Kinetic studies revealed that Lagergen's pseudo-second order model was followed. Intra-particle diffusion of Mg2+influenced the ion exchange, but it is not the rate-limiting step. Rather than having to dispose of the Mg-loaded (waste) zeolite, a possible application was tested. Addition to a wastewater with a low concentration of Mg showed that it could successfully make up for the lack of Mg micronutrient and, accordingly, enabled the growth of phosphate-accumulating bacteriaA. Junii, increasing the amount of phosphate removed from the wastewater.

Antimicrobial activity of metal oxide nanoparticles supported onto natural clinoptilolite

Chemosphere ◽  
2012 ◽  
Vol 88 (9) ◽  
pp. 1103-1107 ◽  
Author(s):  
Jasna Hrenovic ◽  
Jelena Milenkovic ◽  
Nina Daneu ◽  
Renata Matonickin Kepcija ◽  
Nevenka Rajic
Keyword(s):  
Antimicrobial Activity ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Natural Clinoptilolite

Equilibrium Kinetic and Thermodynamics Studies of Uranium Adsorption by Natural Clinoptilolite from Acidic Medium

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Mohamed Atrees ◽  
Hagar El-Shamy ◽  
Mostafa Khalil ◽  
El-Sayed haggag ◽  
Mohamed Elawady ◽  
...  
Keyword(s):  
Acidic Medium ◽  
Uranium Adsorption ◽  
Natural Clinoptilolite

Adsorption of sulfur dioxide on chemically modified natural clinoptilolite. Acid modification

2009 ◽  
Vol 152 (2-3) ◽  
pp. 389-395 ◽  
Author(s):  
Stephen J. Allen ◽  
Emilia Ivanova ◽  
Bogdana Koumanova
Keyword(s):  
Sulfur Dioxide ◽  
Acid Modification ◽  
Chemically Modified ◽  
Natural Clinoptilolite

Hardwood lignin pyrolysis in the presence of nano-oxide particles embedded onto natural clinoptilolite

2013 ◽  
Vol 176 ◽  
pp. 162-167 ◽  
Author(s):  
Nevenka Rajić ◽  
Nataša Zabukovec Logar ◽  
Aleksander Rečnik ◽  
Mohamad El-Roz ◽  
Frederic Thibault-Starzyk ◽  
...  
Keyword(s):  
Nano Oxide ◽  
Oxide Particles ◽  
Natural Clinoptilolite
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