Synthesis of SBA-15 encapsulated ammonium molybdophosphate using Qaidam natural clay and its use in cesium ion adsorption

Abstract

The ordered hexagonal mesoporous silica (SBA-15) encapsulated ammonium molybdophosphate (AMP) was successfully synthesized using low-grade natural clay from Qaidam Basin as silica and aluminum source, through a one-pot synthesis method. The final product was fully characterized, which indicated that the composite material had better AMP dispersion and immobilization in the mesoporous structure of SBA-15. The adsorption capacity of the final product for removing cesium ions in solution was also 10 investigated. Results suggested that Qaidam natural clay is a promising low-cost precursor for the production of mesoporous silicate support, and the final composite material is effective for the adsorption of cesium ions from solution containing some other alkali metal ions. 65 consideration in potassium recovery processes. Therefore, the primary objective of the present work is to develop an easily accessible one-pot method for synthesis of composite material AMP/SBA-15 from natural clay which were collected directly from a salt lake in Qaidam Basin, Qinghai, and denoted QHS. 70 The adsorption capacity of the final product obtained in this work for removing cesium ions in solution was also investigated Experimental SectionMaterials A raw representative sample of clay (QHS) was collected from 75

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

“…In contrast to bulk HPMo, the thermal stability of HPMo increases substantially after immobilization in AlSiM, which coincides with previous reports [61,65]. This may be due to the formation of intermolecular bonding between AlSiM and HPMo and indicated the presence of chemical interactions between them, behavior similar to that previously reported for HPMo deposited in mesoporous silicas [59,60,61,62,65,66,70].…”

“…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 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.…”

Batch and fixed-bed column studies for selective removal of cesium ions by compressible Prussian blue/polyurethane sponge

“…3 A variety of adsorbents, such as zeolites, clays, permutite, activated carbon, carbon nanotubes, chitosan, alginate, cellulose and their composites, have been employed to remove cesium ions from wastewater. [7][8][9][10][11][12] Transition metal ferrocyanides such as iron ferrocyanide (also known as Prussian blue, PB) have special lattice structure and can exchange metal ions with cesium ions. 13 They have been widely applied in the adsorption of cesium ions from radioactive wastewater due to their low cost, non-toxicity, good stability and high selectivity.…”