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Article Dans Une Revue Environmental Engineering and Management Journal Année : 2021

Application of thermal analysis to improve the preparation conditions of zeolitic materials from flying ash

Résumé

The aim of this study is to gain a better understanding of ash properties that makes it suitable for obtaining geopolymeric/zeolitic materials, as well as to demonstrate that thermal analysis can be used as an innovative procedure to compare different activation methods. Establishing a relationship between the physical and chemical characteristics of ash and materials obtained from fly ash is an important step towards producing large quantities of zeolitic materials with pre-established properties. In this paper, a direct relationship between TG analysis and the type of materials obtained from the local fly ash, by different methods, was proved for the first time. The experimental results demonstrated that the materials with a surface area over 40 m(2)/g and pores volume over 0.12 cm(3)/g exhibited the highest thermal loss. The samples exhibiting thermal loss over 10% contained zeolites phases, a fact confirmed by FT-IR and XRD, and more than 7% sodium in samples structure, as demonstrated by EDAX analysis. The results shown that thermal analysis allowed identification of the materials, as well as elucidation of the processes occurring during the thermal heating. Concordant to this study, the conditions for the optimum activation method consisted in: direct activation method, temperature equal to 363 K-o, contact time 4 h, 1/3 solid/liquid ratio and use of 5M NaOH activation solution. It is known that TG/DTG analysis is an easy and the economic feasible method. TG analysis for establishing the zeolitization degree on the base of the number of stages (four stages), but more important, on the base of total mass losses (over 10%) is recommended.

Domaines

Chimie
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Dates et versions

hal-03245076 , version 1 (01-06-2021)

Identifiants

Citer

Gabriela Buema, Gabriela Lisa, Olga Kotova, Gabriela Ciobanu, Liliana Ivaniciuc, et al.. Application of thermal analysis to improve the preparation conditions of zeolitic materials from flying ash. Environmental Engineering and Management Journal, 2021, 20 (3), pp.377-388. ⟨10.30638/eemj.2021.038⟩. ⟨hal-03245076⟩
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