Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

Materials Research

Lindiane Bieseki²  Fábio Garcia Penha¹  Sibele Berenice Castellã Pergher² 

[1] ,Universidade Federal do Rio Grande do Norte - UFRN Programa de Pós-graduação em Ciência e Engenharia de Materiais Laboratório de Peneiras Moleculares - LABPEMOLNatal RN ,Brasil

关键词: zeolite A;    coal ash;    adsorption;    pigment;   

DOI  :  10.1590/S1516-14392012005000144

来源: SciELO

【 摘 要 】

Zeolite A was synthesized using the coal ash from Siderópolis/RS - Brazil. The synthesis was based on a standard IZA synthesis using coal ash as the Si and Al source. XRF analysis showed that the coal ash has a Si/Al ratio of 1.52, which is close to the Si/Al ratio required to produce zeolite A (1.0). The synthesized materials were analyzed by XRD, SEM and N2 adsorption. More crystalline materials were obtained during synthesis when an additional treatment was applied at a temperature of 353 K at the dissolution of NaOH step. The product formed after 4 hours was the most crystalline, but even the product formed after 1 hour proved to be better than that formed using the standard 4 hours IZA synthesis. The zeolites synthesized by this method had an adsorption capacity of 120 mg.g-1 for Ca2+, half the capacity of commercial zeolite A (300 mg.g-1). It was not possible to obtain blue or green pigments using the synthesized zeolite A.

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