Synthesis of mordenite and its composite material using chemical reagents for Cs decontamination

Abstract

Mordenite was synthesized using chemical reagents of amorphous SiO 2 and sodium aluminate without the addition of a template agent and a seed powder. The single phase of the mordenite was obtained for the Al/Si ratios of 0.0850.120 as the starting material in the reaction temperature range of 170200°C for 24 h. The cation exchange capacity (CEC) was ca. 180210 cmol/kg and it increased with the Al/Si ratio. The Cs + adsorption ability from 100 ppm Cs + 100 mL solutions of water and seawater for the mordenite (1.0 g) was >99% and ca. 8592%, respectively. A composite material consisting of the mordenite and magnetite (10, 20, 30 wt %) was synthesized for the magnetic collection. The total Cs decontamination rates using the magnetic collection material after the Cs + adsorption in water were also higher than 95% for all the examined magnetite-containing composite materials.

Magnetic Adsorbents for Wastewater Treatment: Advancements in Their Synthesis Methods

“…Zeolites, a group of aluminosilicate compounds that are widely used as adsorbents in environmental remediation, have been combined with magnetic particles, to improve the performance of adsorbents. The preparation of magnetic zeolites using conventional hydrothermal methods with different frameworks has been reported, including P zeolite [ 110 ], ZSM-5 [ 115 ], NaA [ 118 ], and mordenite [ 111 ]. The synthesis begins by mixing Fe 3 O 4 with a zeolite precursor solution, before transferring it to a stainless steel autoclave, followed by crystallization at specific temperatures, for a determined amount of time.…”

Cs+ decontamination properties of mordenites and composite materials synthesized from coal fly ash and rice husk ash

“…This mixture was heated at 170°C for 24 h in an autoclave, and then washed several times by centrifugal separation with deionized water to remove the excess alkali. It was next dried at 70°C for 24 h. Another mordenite was also prepared using chemical reagents for as the control comparison (Sample (b)) [21].…”

“…For the rice husk ash, the main phase was the amorphous silica with potassium oxide as an impurity. The calcination temperature of 700°C was selected for the preparation of the rice husk ash, because amorphous SiO 2 powder was necessary for the reaction using the NaOH solution [21]. In this case, the yield of the rice husk ash was 15.7 wt% from the rice husk.…”

“…Although the synthesis of mordenite has been reported by a hydrothermal method using the reagents of Na, Al, and Si sources without the template and the seed, the conditions for the preparation have not been established in detail [18,19]. We established the preparation method for the mordenite or the composite materials of mordenite and nanosized magnetite from the diatomite or chemical reagents [20,21]. The most suitable Al/Si ratio of the raw materials was determined for the preparation of the mordenite.…”

Utilization of Various Analogy of Synthetic Nanoporous Zeolites and Composite of Zeolites for Decontamination/Detoxification of CWA Simulants—An Updated Review

“…Degradation mechanism of parathion methyl by mesoporous MnO 2 .A. Hiromichi et al[101] (2016) reported synthesis of mordenite zeolite and its composite material using for toxic Cs ion decontamination. Reagents SiO 2 and NaAlO 2 used for synthesis without addition of a template and a seed powder.…”