Facile Preparation of Ammonium Molybdophosphate/Al‐MCM‐41 Composite Material from Natural Clay and Its Use in Cesium Ion Adsorption

Abstract

Ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source. We introduced a modified "liquid-phase transport" step, which allowed the use of impure natural clay as a starting material to directly produce pure product without sedimentation pretreatment. The resultant product was characterized by X-ray fluorescence (XRF) spectroscopy, FTIR spectroscopy, XRD,

Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

“…The least wide pore size distribution of the HPMo/AlSiM samples (10, 20, 30) are related to their less disordered mesostructures, as shown by the XRD standard (Figure 2a) and this is reflected in the less accentuated slope of the second stage of the isotherm values of 0.3 < p/p 0 > 0.4 (Figure 3a) compared to the AlSiM [64]. The data obtained from the adsorption and desorption branches of N 2 are in agreement with others already published for the mesoporous materials anchored with HPMo [59,60,61,62,65,66,67].…”

“…The vibration bands observed in the 790 and 460 cm −1 regions are attributed to the symmetrical and asymmetric bending of tetrahedral O–Si–O bonds, respectively [71], which are also slightly shifted to higher frequencies after calcination of the material [46,50]. The main characteristic bands of the Keggin structure in 1060 cm −1 (P–O), 967 cm −1 (Mo–O), 867 e 785 cm −1 (Mo–O–Mo) are observed for bulk HPMo material in consistency with previous reports [28,60,61,62,65,66]. The above vibrations are also visible on supported HPMo catalysts of less than 30 wt % and their corresponding intensities increase with increasing HPMo content, which indirectly proves that there are interactions between the silicon species and HPMo in the AlSiM framework hydrogen bonding [28,59,60,65].…”

“…The partial disappearance of the upper peaks suggested that the (10, 20 and 30) HPMo/AlSiM1 samples had a less ordered structure compared to AlSiM1, but the mesoporous structure and hexagonal ordering were maintained after the introduction of HPMo [30,59,60,61]. These results show that the impregnation of HPMo caused a decrease of d 100 and a 0 and an increase of W t , (Table 2), reported in the literature indicating that HPMo may be well dispersed on the surface and inside the AlSiM pores, forming thin layers [60,62]. A summary of the values of d 100 are presented in Table 2 along with the corresponding unit cell parameters (a 0 ) and wall thickness (W t ) of all samples.…”

“…The above vibrations are also visible on supported HPMo catalysts of less than 30 wt % and their corresponding intensities increase with increasing HPMo content, which indirectly proves that there are interactions between the silicon species and HPMo in the AlSiM framework hydrogen bonding [28,59,60,65]. Studies confirm that silane groups (967 cm −1 ) interact with HPMo species to form binding Si–O–Mo [37,60,61,62,66,72]. This observation is corroborated with the explanation reported by Khayoon and Hameed [59] in which the presence of silanol (Si–OH) groups in the silica porous wall contribute to react with HPMo to form Si–O–Mo–O bonds, which finally develop in thin layers on the inner walls of the surface pores of SBA-16.…”

Aminopropyl-grafted various silica mesostructures for adsorption of molybdenum ions from Re-containing effluent

“…Alternatively, the mesocellular foams (MCF) have also been the compelling representative mesoporous silica due to the handily achievable large spherical cell sizes (Schmidt-Winkel et al 1999;Dana and Sayari 2011). The addition of organic groups by grafting organosiloxane precursors onto the surface of the pores of mesoporous silicas results in functional mesoporous hybrid materials (Antoschuk and Jaroniec 2002;Bibby and Mercier 2002;Hossain and Mercier 2002;Walkarius et al 2002;Yoshitake et al 2002;Yee et al 2003;Messina et al 2006;Li et al 2008Li et al , 2013Li et al , 2015Idris 2015;Bordoni et al 2015;Yu et al 2015;Zhang et al 2007;Wu et al 2010;Maretto et al 2015;Coll et al 2009;Sun et al 2015;Kandula and Jeevanandam 2015). These organic-inorganic hybrid materials have been reported to exhibit improved sorption properties toward heavy metal ions.…”