FTIR spectroscopy of framework aluminosilicate structures: carnegieite and pure sodium nepheline

Removal of copper ions from aqueous solutions by kaolinite and batch design

“…FTIR spectra of calcinated kaolinite at 600 • C are also shown in Fig. 7 and the vibration bands for metakaolinite are given in Table 4 [26,31,32]. The broad bands of metakaolinite, located at 795 and 800 cm −1 assigned to the Al O bonds in Al 2 O 3 is observed.…”

“…7 presents the IR spectra of natural and calcinated kaolinite samples. Assignment of the FTIR vibrational frequencies of the experimental and literature data of kaolinite are given in Table 3 [26][27][28][29][30]. The main IR functional bands of the kaolinite given in Fig.…”

Structural characterization of pure Na-nephelines synthesized by zeolite conversion route

“…7), and results of 29 Si MAS NMR. Overall, from the two IR bands of ps-Ne-s, a degree of short range ordering of T-cations can be revealed [67].…”

Sonochemical Synthesis of Zeolite A from Metakaolinite in NaOH Solution

“…The band at around 557 cm À1 is closely related to the formation of double four-membered rings (D4R) in zeolite structure. 21) In addition, the band at 1070 cm À1 was shifted to around 1000 cm À1 , which is an important assignment of Si-O-Al bonds in TO 4 tetrahedra in zeolite or HS structure, strongly suggests that SiO 2 and Al 2 O 3 of the starting sample were transformed into aluminosilicates structure with an aid of ultrasound. 22) On the other hand, the bands of weak intensity detected at 721, 694 and 663 cm À1 in the product obtained at an extended sonicating time of 240 min are in good agreement with the characteristic bands for HS structure.…”