Properties and characterization of a metakaolin phosphate acid–based geopolymer synthesized in a humid environment

Solidification and Stabilization of Spent TBP/OK Organic Liquids in a Phosphate Acid-Based Geopolymer

“…e Si-O symmetrical vibration of metakaolin at 1090 cm − 1 shifted to 1128 cm − 1 after solidification. is indicates that the network structure of SPT comprises -Si-O-P-O-Si-and -P-O-Al-as well [12]. e products were nearly the same for PAG and SPT.…”

“…In Figure 14, in the spectra of the CST, DST, and EST samples, the bands at 924 cm − 1 were attributed to -P-O-Pvibrations [12,13]. New bands at 732 cm − 1 are in agreement with the formation of -P-O-Al-.…”

“…Bands at 805 cm − 1 , 688 cm − 1 , and 568 cm − 1 ascribed to -Si-O-Al(IV), -Si-O- Al(V), and -Si-O-Al(VI), respectively, appeared in the spectra of calcined kaolin. ese bands disappeared after geopolymerization, and new bands at 726 cm − 1 , indicative of the formation of -P-O-Al-, were observed in the spectra of PAG [12]. e bands at 926 cm − 1 are attributed to -P-O-Pvibrations [12,13].…”

“…ese bands disappeared after geopolymerization, and new bands at 726 cm − 1 , indicative of the formation of -P-O-Al-, were observed in the spectra of PAG [12]. e bands at 926 cm − 1 are attributed to -P-O-Pvibrations [12,13].…”

“…is implies that the formation of -Si-O-P-O-Si-occurred in the geopolymer network [15]. Figure 11: X-ray diffraction patterns of kaolin (KA) [12], calcined kaolin (MK) [12], and phosphate acid-based geopolymer (PAG). [12], calcined kaolin (MK) [12], and phosphate acid-based geopolymer (PAG).…”