LTA zeolite synthesis using natural materials and its evaluation by Green Star methodology

Abstract

The industrial costs of zeolite synthesis can be diminished by the substitution of traditional raw materials by natural sources. In this work, we obtained LTA zeolite from four natural materials, three different diatomites and expanded perlite, and characterize them by X-ray diffraction, X-ray fluorescence and scanning electron microscopy. It was possible to observe the formation of the zeolitic materials through the identification of the Bragg reflections and the cubic morphology characteristic of the aluminosilicate. The Si/Al ratio of the samples resulted next to the unit as expected for this topology. We found small differences between the zeolitic products, remarking the possibility of adapting this process using natural materials to industry. These results were used for the Green Star evaluation, calculating the synthesis degree of greenness, resulting greener due to the complete substitution of the traditional silica source.

Comparative lead adsorptions in synthetic wastewater by synthesized zeolite A of recycled industrial wastes from sugar factory and power plant

“…ZBG and ZCF illustrated the crystalline phases at 2θ of 7.2, 10.3, 12.6, 16.2, 21.8, 24, 26.2, 27.2, 30, 30.9, 31.1, 32.6, and 33.4 which represented the specific peaks of zeolite A characteristic. The results were correctly matched to the crystalline phases of STD and zeolite A standard pattern of JCPDS 39-222 [ 63 ] which confirmed that ZBG and ZCF were zeolite A [ 64 ].

Figure 3 XRD diffraction patterns of (a) ZBG, (b) ZCF, and (c) STD.

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Interzeolitic Transformation of Clinoptilolite into GIS and LTA Zeolite

“…To reduce the production costs of synthetic zeolites, alternative sources of silicon and aluminum have been used. High-quality synthetic zeolites can be synthesized using a wide range of alternative sources, including natural aluminosilicates such as clays [8][9][10][11][12][13][14][15][16][17][18][19], natural zeolites [20,21], diatomite [22,23], and waste resources [24][25][26][27][28][29][30][31][32].…”