Synthesis, characterization and application of cancrinite in ground water treatment from Wadi el-Assiuti area, Assiut-Egypt

الملخص EN

Cancrinite is one of the rarest members of the feldspatboids group; it is classified also as a zeolite, due to its open pore structure, which confers molecular sieve properties.

It was successively synthesized in the absence of organic template by hydrothermal method at 180'C for 5 days after stirring at high speed and aging in the synthesis mixture with the molar composition of ISafi: 6SiO~: l.&Alfif 9BjO.

The produced samples were investigated using X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-ER) and Thermo Gravimetric Analysis (TGA) DTA'TG.

Cancrinite was tested as adsorbents for the removal of nitrate ions from the ground water samples from Wadi El- Asauti-Egypt.

The adsorption capacities of nitrate ions by cancrinite, as a function of its concentration, were determined at room temperature by varying the cancrinite concentration for each water samples.

During the process, aD the other parameters (pH and contact time) were kept constant with respect to the initial concentration of nitrate ions in the water samples.

It was found cancrinite has good removal efficiency obtained at pH 6-7.6, adsorbent dosage 10 g/L, and contact time 60 min.

The Langmuir constants model for NO , ion sorption on the adsorption isotherms is fitted well The R, value in the present investigation was equal or less than one, indicating that the adsorption of NO j ion by cancrinite is favorable.