Effect of ultrasound on the kinetics of cation exchange in NaX zeolite

Abstract

a b s t r a c tIn this study, we focused on the effect of ultrasound on ion exchange kinetics to obtain the Li-, Ca-and Cerich NaX zeolite. The results were compared to those obtained from the traditional batch exchange method under similar conditions. Contact time and initial cation concentration (fold equivalent excess) were studied. Ultrasound enhanced the replacement of Na + ion with Li + , Ca 2+ and Ce 3+ ions in the extra-framework of zeolite up to 76%, 72% and 66%, respectively. The intraparticle diffusion is the rate limiting step in the ion exchange for both exchange methods. As compared to the traditional exchange method, the ultrasonic method applied in this study was found to be very effective on the exchange amount at equilibrium.

Adsorption of carbon dioxide on MIL53(Al), CuBTC and K- NaX zeolite

“…In preparation of KNaX, ultrasound is employed as an alternative method to traditional ion exchange method as given detailed in the previous study. 18 2 g of zeolite were mixed with 20 mL of 1 M KCl solution for 2h at 50 °C or 70 °C with water bath shaker (GFL 1092) at 130 rpm (in traditional method) or ultrasonic processor (Sonics-Vibracell-VC 505) at 16 kHz frequency (in ultrasonic method). The mixtures were centrifuged and then zeolite phases were washed with water until Clfree solutions were obtained.…”

“…In literature, ultrasonic method as compared to the traditional exchange method was found to be very effective on the exchanged amount at equilibrium. 18 In this paper, we studied CO2 adsorption on two types of adsorbents: K exchanged NaX zeolites (KNaXs) which were prepared with ultrasonic and traditional methods and commercial metal organic frameworks (MOFs): Cu-BTC and MIL53 (Al).…”

Use of chitosan-modified fly ashes and zeolites for removal of heavy metal ions Zastosowanie popiołów lotnych i zeolitów modyfikowanych chitozanem do usuwania jonów metali ciężkich

“…mechanizm sorpcji mógł obejmować reakcje chemiczne na powierzchni, w tym chemisorpcję z wytworzeniem wiązań pomiędzy jonami metali a chitozanem. Analogiczne rezultaty uzyskano również w przypadku prac innych autorów [22][23][24] .…”

“…Adsorpcja jonów metali na chitozanie może zachodzić zgodnie z różnymi mechanizmami. Rozróżnić tu można proces wymiany tych jonów z protonami pochodzącymi z grup aminowych, wymianę anionów na anion metalu, może też przebiegać proces koordynacji z udziałem grup aminowych chitozanu czy reakcje z grupami hydroksylowymi chitozanu 16,17) . Natura tych oddziaływań zależy od wielu parametrów związanych zarówno z sorbentem, jak i chemizmem danego jonu metalu.…”

Modified Zeolite with Transition Metals Cu and Fe for Removal of Methylene Blue from Aqueous Medium: Mass Spectrometry Study

“…New and innovative methods are of great importance to devise technologies for dealing with environmental problems [10]. The application of modified catalyst technology to solve environmental problems is one of these methods that have received considerable attention in recent years [11,12].…”