Structural and physicochemical properties of natural zeolites: clinoptilolite and mordenite

Korkuna, O.; Лебода, Р.; Ba, Jingwen; Vrublevska, Teodoziya; Гунько, В.М.; Ryczkowski, J.

doi:10.1016/j.micromeso.2005.08.002

Cited by 302 publications

(171 citation statements)

References 35 publications

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“…The second stage occurs at 300-700°C because of dehydroxylation (i.e., associative desorption of water molecules on removal of the surface hydroxyls). These data are in good correlation with previous results [18]. Dye adsorption does not significantly influence the thermal stability of the modified zeolite (Table 3) because of its high structural stability and rigidity and the absence of rearrangement of particles due to the dye adsorption observed for the modified clay.…”

Section: Resultssupporting

confidence: 91%

Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

Sternik

Majdan

Deryło–Marczewska

et al. 2010

J Therm Anal Calorim

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Influence of physically adsorbed basic red 1 (BR1) dye on the physicochemical properties of natural zeolite (clinoptilolite) and clay (bentonite) was compared using adsorption, FTIR, and TG/DTA methods. A larger adsorption of the dye was observed for bentonite (0.143 mmol/g) than for clinoptilolite (0.0614 mmol/g) per gram of an adsorbent. However, the adsorption values are the same per surface unit (1.8 lmol/m 2 ). The result (per gram) is due to location of dye molecules in interlayer and interparticle space of bentonite with much larger specific surface area than that of clinoptilolite. The dye adsorption leads to a decrease in the specific surface area and the pore volume of both minerals. The adsorption changes also a character of active sites and thermal stability. A TG study shows that the dye adsorption on bentonite changes adsorbed water amounts, weight loss, and decomposition temperature. In the case of zeolite, the dye adsorption insignificantly influences the thermal stability. The dehydration energy distributions calculated from the Q-TG and Q-DTG data demonstrate a complex mechanism of water thermodesorption and the influence of adsorbed dye on this process.

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Section: Resultssupporting

confidence: 91%

Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

Sternik

Majdan

Deryło–Marczewska

et al. 2010

J Therm Anal Calorim

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“…This is due to de-catination, de-alumination and the dissolution of amorphous silica fragments blocking the channels. A study by Korkuna and coworkers also revealed that there is a change in the clinoptilolite structure after acid treatment with dilute acid activations accounting for improved removal capability of the HCl-clinoptilolite (Korkuna et al, 2006). Studies by Vasylechko and co-workers confirm the findings of this study with respect to the effect of acid-activation of natural clinoptilolite (Vasylechko et al, 1999;Vasylechko et al, 2000).…”

Section: Copper and Cobalt Removal Using Hcl-activated Clinoptilolitesupporting

confidence: 83%

The effect of conditioning with NaCl, KCl and HCl on the performance of natural clinoptilolite’s removal efficiency of Cu<sup>2+</sup> and Co<sup>2+</sup> from Co/Cu synthetic solutions

Mamba¹,

Nyembe²,

Mulaba‐Bafubiandi³

2010

WSA

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Southern African clinoptilolite's capability as an ion-exchanger with respect to Cu 2+ and Co 2+ was investigated in order to consider its viability in the removal of metal cations from aqueous solutions. The effect of chemical conditioning was investigated using sodium chloride (NaCl), hydrochloric acid (HCl) and potassium chloride (KCl). The most efficient activating or conditioning reagent was found to be HCl at 0.02 M concentration, followed by KCl at 0.04 M and then NaCl at 0.04 M. The worst performing clinoptilolite was the original form under the conditions described in this study and it thus served as a control. The HCl-conditioned clinoptilolite was the most efficient in metal removal (79% Co 2+ and 73% Cu 2+) followed by the NaCl-conditioned form (69% Co 2+ and 54% Cu 2+ ), while the KCl-conditioned form adsorbed 54% and 73% of Co 2+ and Cu 2+, respectively. The column method was used for the cation-exchange processes with synthetic solutions of 0.0020 M, 0.0698 M and 0.2000 M of Co 2+ and Cu 2+ concentrations which were measured using atomic absorption spectroscopy (AAS).

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“…The complexion of cations by stable bonds with the negative radicals on the mineral surfaces is promoted by higher pH values. Zeolite minerals can play a significant role in thus surface complexion because of their high specific surface (Korkuna et al, 2006 andSponer et al, 2001). The increase pH value of treated soil by the tested amendments (Table 2) confirmed the buffering effect (Radulescu, 2013) and suggested the opportunity of using zeolitic materials for conditioning and remedying contaminated soil from sulfide mines.…”

Section: Discussionmentioning

confidence: 52%

Reduction of Toxic Element Mobility in Mining Soil by Zeolitic Amendments

Giannatou¹,

Vasilatos²,

Mitsis³

et al. 2017

geosociety

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Structural and physicochemical properties of natural zeolites: clinoptilolite and mordenite

Cited by 302 publications

References 35 publications

Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

The effect of conditioning with NaCl, KCl and HCl on the performance of natural clinoptilolite’s removal efficiency of Cu<sup>2+</sup> and Co<sup>2+</sup> from Co/Cu synthetic solutions

Reduction of Toxic Element Mobility in Mining Soil by Zeolitic Amendments

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