| Abstrakt: |
The aim of this study is to investigate the operating conditions involved in the hydrothermal synthesis of Linde Type A LTA zeolite. Initially, we conducted a preliminary examination focusing on the impact of the reaction medium's alkalinity, temperature, and crystallization time using X-ray diffraction. Subsequently, a more in-depth analysis of the reaction medium's alkalinity was conducted through Thermogravimetric Analysis, Laser diffusion for particle size distribution determination, and the BET (Brunauer, Emmett and Teller) method for estimating the surface area. The results revealed that elevating the crystallization temperature can effectively decrease the synthesis time of LTA zeolite. Additionally, an increase in the alkalinity of the solution was found to lower both the crystallization temperature and time. The zeolite possessing the greatest surface area was employed to adsorb chromium present in a real effluent sourced from a tannery located in the Fez city. The synthesized LTA zeolite demonstrated high efficacy in removing chromium from tannery effluent. In particular, when exposed to the waste for 24 h with an adsorbent dose of 10 g/l, the chromium retention reached approximately 70 mg/g per gram of adsorbent. The study of adsorption kinetics involved the examination of the Pseudo-first-order, Pseudo-second-order models, and the intraparticle diffusion model. |
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