Extraction of Perchlorate Using Porous Organosilicate Materials

Abstract

Sorbent materials were developed utilizing two morphological structures, comprising either hexagonally packed pores (HX) or a disordered pore arrangement (CF). The sorbents were functionalized with combinations of two types of alkylammonium groups. When capture of perchlorate by the sorbents was compared, widely varying performance was noted as a result of differing morphology and/or functional group loading. A material providing improved selectivity for perchlorate over perrhenate was synthesized with a CF material using N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride. Materials were applied in batch and column formats. Binding isotherms followed the behavior expected for a system in which univalent ligands of varying affinity compete for immobilized sites. Performance of the sorbents was also compared to that of commercial Purolite materials.

Improving Sorbents for Glycerol Capture in Biodiesel Refinement

“…0.4–0.7) corresponding to capillary condensation in mesopores ( Figure 2 ). The silicate scaffolds have ordered mesostructures in which cylindrical mesopores are arranged with 2D-hexagonal packing; the pore sizes of 56 Å (S65-Ph(1)) and 64 Å (S85-Ph(1)) are influenced by the amounts of mesitylene, the micelle swelling agent, included in their syntheses [ 24 , 25 ].…”

“…This effort did not focus on purification of glycerol. However, we have previously demonstrated the use of this type of sorbent in solid phase extraction for increasing the concentration of perchlorate and nitroenergetic targets [ 20 , 25 , 29 , 33 ]. In these cases, the target is adsorbed from aqueous solution and eluted from the sorbent using a solvent or an acid containing solution.…”

“…Scaffold materials were synthesized based on a previously published procedure [ 24 , 25 ]. Pluronic P123 (4.0 g) and 0.65 g (S65) or 0.85 g (S85) mesitylene were dissolved in 12.0 g of 1.0 M HNO 3 with heat (~65 °C) and magnetic stirring.…”

Adsorption and Elution of Nucleic Acids: Mesoporous Materials and Methods

“…Sorbents with alkylammonium groups. The alkylammonium group bearing materials were synthesized based on a previously published approach [50,51,53]. For synthesis of the HX sorbent, 4.0 g of Pluronic P123 and 0.85 g of TMB were dissolved in 12.0 g of 1.0 M HNO3 with magnetic stirring and heating at 60 ∘ C. The stirring mixture was allowed to cool to room temperature and 5.15 g of TMOS was added drop-wise.…”