Nanoporosity of MCM-41 Materials and Y-Zeolites Created by Deposition of Tournefortia hirsutissima L. Plant Extract

Abstract

Hybrid materials based on MCM-41 silica and Y-zeolites with a variable Si/Al ratio and an appropriate countercationic composition were prepared by impregnating inorganic substrates with an organic extract. The organic phase was previously characterized by GC-MS and IRTF, while XRD, SEM, TEM, N 2 -physisorption, and TPD of NH 3 were used to analyze the selected inorganic supports. The effect of size-and shape-selectivity was manifested in MCM-41 and Y-zeolites. Texture results confirm that the extract containing relatively large branched organic molecules is deposited in the internal voids of MCM-41 material and on the outer area of Yzeolites. In the case of Y-zeolites, the results demonstrate the effect of the SiO 2 /Al 2 O 3 molar ratio and countercations on the textural properties of the samples.

Study of adsorption of selected organic species from aqueous solution on nh4be ta zeolite

“…Adsorption is one of the most frequently used methods thanks to its performance simplicity, as well as efficiency, and to the greatest extent it is determined by adsorbent characteristics, in terms of finding adsorbents of high selectivity, adsorption capacity and ecological acceptability (De Haro-Del Rio et al, 2018;Greg and Sing, 1982;Inglezakis, 2010;Penavin-Skundric et al, 2013;Sucurovic, 2017). A good choice are zeolites, since due to their unique characteristics they meet the mentioned requirements (Baerlocher, 2013;Chuaykleang and Ratanawilai, 2014;Dyer, 1988;Hernández et al, 2017;Krisnandi et al, 2015;Rakic et al, 2003;Sladojevic et al, 2014;), and also have the ability of regeneration and repeated use in many cycles. This study observed adsorption of EDTA and H 2 C 2 O 4 from the aqueous environment on the synthetic zeolite NH 4 BETA, with the purpose of obtaining more complete information on the adsorption capacity of this zeolite, as well as on its potential use in purification of waste waters from the organic polluters.…”