Adsorption of Ammonium Ions onto a Natural Zeolite: Transcarpathian Clinoptilolite

Abstract

A study was carried out of ammonium ion sorption from synthetic aqueous solutions by Transcarpathian clinoptilolite, a natural zeolite, under static conditions. The main physical properties of the clinoptilolite and the basic parameters of its porous structure were determined. Values of the specific surface area and of the pore volume occupied by sorbed substances were calculated using the relative moisture content established and the maximum sorption capacity exhibited towards ammonium ions as well as a nitrogen adsorption/desorption method. Ammonium ion sorption by the zeolite appeared to be complete within 24 h for all fraction sizes, initial NH + 4 ion concentration and adsorbate volumes. The amounts of NH + 4 ions sorbed increased with increasing initial NH + 4 concentration and decreasing adsorbate volumes, with the maximum sorption capacity exhibited by the clinoptilolite being 0.64 mequiv/g. The sorption effectiveness decreased somewhat with increasing fraction size. The Langmuir and Freundlich models were applied to the data obtained from the batch studies with the first model exhibiting the more satisfactory correlation coefficient value (0.996 and 0.959, respectively).

Mixed Agricultural Pollutant Mitigation Using Woodchip/Pea Gravel and Woodchip/Zeolite Permeable Reactive Interceptors

“…Breakthrough and exhaustion capacities for adsorption of NH 4 + ions were 3.36 and 4.26 mg/g (NH 4 + -N/zeolite), respectively. In the literature, q max values have not exceeded 14.82 mg/g for NH 4 + -N (Haralambous et al 1992;Lebedynets et al 2004;Njoroge and Mwamachi 2004), whereas this study reports q max values of 40 mg/g. Therefore, the cost of the pea gravel may be very low, but the longevity, based on the concentration of DSW, will be very short.…”

Removal of ammonium ion from aqueous solution by natural Turkish (Yıldızeli) zeolite for environmental quality

“…The calculated from the slope and intercept of the linear plot, the maximum amount of exchanged NH 4 + (b) and the Langmuir constant (k) were 9.64 mg g −1 and 0.0548 L mg −1 at 21 • C, respectively. Lebedynets et al [18] and Karadag et al [16] reported that the maximum amount of exchanged NH 4 + using the transcarpathian clinoptilolite and natural Turkish clinoptilolite were 11.5 and 8.12 mg g −1 at 25 • C, respectively. Weatherley and Miladinovic [19] found the ion exchange capacity of New Zealand clinoptilolite for NH 4 + ion as 6.588 mg g −1 .…”

Adsorption characteristics of ammonium ion by zeolite 13X

“…The maximum adsorption capacity of adsorbent (q 0 ) and the adsorption energy coefficient (k) calculated from the slope and the intercept of the linear plot were 8.61 mg/g and 0.044 L/mg at 25 • C, respectively. Lebedynets et al [19] and Karadag et al [10] reported that the maximum amounts of exchanged NH 4 + using the transcarpathian clinoptilolite and natural Turkish clinoptilolite were 11.5 and 8.121 mg/g at 25 • C, respectively. Weatherley and Miladinovic [20] found the maximum amounts of exchanged NH 4 + by New Zealand clinoptilolite and mordenite to be 6.588 and 9.479 mg/g, respectively.…”