Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

Abstract

This paper focuses on the synthesis of nanocomposite materials TiO 2 /SAPO-34 using the sol-gel method, which involves preparing a mixture between as-synthesized or calcined SAPO-34 zeolite and TiO 2 gel under hydrothermal crystallization and then calcined at 400 °C for the formation of TiO 2 anatase phase. The structural and textural features of the obtained materials were determined by various physico-chemical techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), Nitrogen sorption at 77 K, energy dispersive X-ray analysis (EDX) and ultravioletvisible (UV-vis). The DRX results showed that calcination at 400 °C of the mixture between calcined SAPO-34 and TiO 2 gel led to the collapse of the original framework of zeolite but forms the anatase TiO 2 in a nano-spherical morphology, but the use of as-synthesized SAPO-34 supports provides a mixture phase between SAPO-34 and TiO 2 anatase after calcination. The photocatalytic properties of SAPO-34/TiO 2 andTiO 2 type materials were tested for the removal of methylene blue (MB) dye. The MB degradation proved to be increasing as a function of contact time, catalyst mass and the initial concentration of MB.

New Porous High Surface Area, TiO2 Anatase/SAPO‐35 Mild Brønsted Acidic Nanocomposite: Synthesis, Characterization and Studies on it's Enhanced Photocatalytic Activity.

“…These results have matched well with the characteristic alignments of anatase form of TiO 2 (JCPDS no. 01–086‐1157) . The XRD results in case of 2:1 ratio of TiO 2 /SAPO‐35 composite clearly showed the domination of TiO 2 patterns over the SAPO‐35 patterns, this is due to the excellent dispersion of TiO 2 on the surface of SAPO‐35, as a consequences the SAPO‐35 crystal patterns are absent.…”

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

“…Zeolites or zeolitic materials, a big family of porous materials, show many distinct properties, such as framework component controllability and high adsorption. Aluminosilicalites and aluminosilicophosphates (SAPOs) are usually used as catalysts in cracking, isomerization, and alkylation reactions, such as SAPO-34 [5,6], Y-type [7,8], and ZSM-5 [9]. Recently, it was found that aluminosilicalites and SAPOs also exhibited photocatalytic activity for the charge transfer excited state of [Al 2+ –O − ]* under UV illumination, which has been demonstrated in some literature [9,10].…”