**3. Preparation of catalyst**

The preparation of the "maghnite-H+ 0.25 M" was carried out by using a method similar to that described by Belbachir and coworkers [28]. Indeed, the raw-maghnite (20 g) was crushed for 20 min using a Prolabo ceramic balls grinder. It was then dried by baking at 105°C for 2 h. The maghnite was then weighed and placed in an Erlenmeyer flask together with 500 ml of distilled water. The maghnite/water mixture was stirred using a magnetic stirrer and combined with 0.25 M of sulfuric acid solution, until saturation was achieved over 2 days at room temperature, the mineral was washed with distilled water until it became sulfate free, and then dried at 105°C [29, 30].

The thermal characterizations of the catalyst include thermogravimetric analysis (TGA). **Figure 3** shows the weight losses (%) versus temperature (°C) curves for pure maghnite-Na<sup>+</sup>

Mag below 100°C is a result of the release of free water. The second weight loss around 600°C is associated with the dehydroxylation of silicate structure [35]. The total weight loss is only

absorption peaks of MMT are assigned to the Si–O–Si skeleton vibration at 1043–1116 cm−<sup>1</sup>

obtained in nitrogen atmosphere at heating rate of 10°C/min.

.

the strong absorption bands of Si–O and Al–O bending vibration at 525–628 cm−<sup>1</sup>

[36, 37].

show two stages of weight loss. The first weight loss in Na<sup>+</sup>

Synthesis and Characterization of Polymeric Material Consisting on Acrylamide Catalyzed…

shows a high thermal stability.

http://dx.doi.org/10.5772/intechopen.80033

and Magh-H+

The TGA of pure maghnite-Na+

stretching vibration at 3425 cm−<sup>1</sup>

**Figure 3.** TGA curves of a maghnite-Na+

**Figure 4.** FTIR spectra of raw-maghnite and maghnite-H+

13.94% up to 800°C. As can be expected, maghnite-Na<sup>+</sup>

**Figure 4** shows the characteristic FT-IR spectra of Magh-Na+

.

115


,

. The characteristic

and the OH
