Abstract
Traditional hydrothermal method (TH) and alkali fusion-assisted hydrothermal method (AFH) were evaluated for the preparation of zeolites from waste basalt powder by using NaOH as the activation reagent in this study. The synthesized products were characterized by BET, XRD, FTIR and SEM. The effects of acid treatment, alkali/basalt ratio, calcination temperature and crystallization temperature on the synthesis process were studied. The results showed that AFH successfully synthesized zeolite X with higher crystallinity and no zeolite was formed by TH. The specific surface area of synthetic zeolite X was 486.46 m2·g−1, which was much larger than that of original basalt powder (12.12 m2·g−1). Acid treatment and calcination temperature had no effect on zeolite types, but acid treatment improved the yield and quality of zeolite. Alkali/basalt ratio and crystallization temperature not only affected the crystallinity of synthesized zeolites but also affected its type. The optimum synthesis condition of zeolite X are as follows: acid treatment of 5 wt% HCl solution, NaOH/basalt ratio of 1:1, a calcination temperature of 650 °C and crystallization temperature of 120 °C. The work shows that basalt can be used as a raw material to prepare zeolite.
Highlights
Zeolites, three-dimensional tetrahedral hydrated aluminosilicate minerals with meso and microporous structures, are widely used as catalysts in separation and refinery industries [1,2,3], feed additives in animal husbandry [4,5], adsorbents in wastewater treatment for the removal of heavy metal cations, anions and dyes [6,7,8]
It is the similarity in the chemical composition of basalt and Coal fly ash (CFA) that leads to the testing of basalt based zeolites growth
The results showed that synthesized products sampleasA,starting
Summary
Three-dimensional tetrahedral hydrated aluminosilicate minerals with meso and microporous structures, are widely used as catalysts in separation and refinery industries [1,2,3], feed additives in animal husbandry [4,5], adsorbents in wastewater treatment for the removal of heavy metal cations, anions and dyes [6,7,8]. The cost of industrial synthetic zeolites from chemical sources is pretty high, which limits its application to a large extent. A lot of attentions have been paid on searching for cheap raw materials for zeolites preparation in recent years. With the exploration of raw materials, the synthesis methods of zeolites have been continuously developed. In terms of the standard features, basalt may serve as another ideal raw material. It is the similarity in the chemical composition of basalt and CFA that leads to the testing of basalt based zeolites growth. The synthesis of zeolites from basalt may enhance its potential value and extend its serviceable scope and reduce the cost of traditional industrial synthetic zeolites. The present study centers on the synthesis of zeolites from wasted basalt powder by using TH and AFH, the main objectives being: (a) To obtain an effective synthesis method; (b) to illuminate the activation conditions for maximum synthesis efficiency; (c) to analyze the effects of different synthesis conditions; (d) to reveal the synthesis mechanism of basalt based zeolites
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
