| Summary: | In this work, zeolite beta (Zβ) was synthesized using fly ash (CV) from coal-fired Power Plant, Termopaipa, at Paipa, Boyacá (Colombia). The silicon and aluminum were extracted from fly ash, wich performed by means an acid pretreatment followed by hydrothermal process with NaOH,. To obtain the zeolite beta, silicon source and aluminum source of gel mother and crystallization time were varied, keeping a nominal composition, so that 50SiO2: 1Al2O3: 25TEAOH: Na2O: K2O: 17H2O. In the first experiment, the CV provided the aluminum source, while the silicon source was obtained by CVand fumed silica, wich were prepared by hydrothermal synthesis, kept at 170 °C for 40 h, which led to obtain ZSM-5 together with a secondary phase of Mordenite. In the second experiment, the CV provided the source of silicon and were necesary the addition of aluminum sulphate octadecahydrate to complete the amount of aluminum source, wich were prepared by hydrothermal synthesis, kept at 170 °C for 60 h, which led to a phase of beta zeolite (Zβ) highly pure. The zeolitic phases were characterized using DRX, FTIR, and SEM and by XRF. The zeolites were modified using (3-aminopropyl) triethoxysilane (APTES) and hexadecyltrimethylammonium bromide (HDTMA-Br). The results show that the zeolite Zβ-APTES with an adsorption capacity of 5 mmol NO3- / 100g have the mayor potential for controlled fertilizer release.
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