Adsorption of organophosphates from solution by porous organosilicates: Capillary phase-separation

Johnson, Brandy J.; Malanoski, Anthony P.; Leska, Iwona A.; Melde, Brian J.; Taft, Jenna R.; Dinderman, Michael A.; Deschamps, Jeffrey R.

doi:10.1016/j.micromeso.2014.04.031

Cited by 20 publications

(20 citation statements)

References 39 publications

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“…So far, many techniques have been introduced by various researchers in this field to effectively eliminate phosphate from an aqueous solution, like precipitation and floatation [14], enzymatic biodegradation [15], electrochemistry [16], and adsorption [17]. From all these techniques, adsorption is one of the extensively used technique for the elimination of phosphates from the water.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

et al. 2019

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Iron was incorporated into an LTA type zeolite using the sol-gel hydrothermal method to form Iron-zeolite-A (Iron-Z-A), and its phosphate adsorption-desorption efficiency were analyzed. Samples were characterized by EDS, SEM, XRD, EPR, FT-IR XPS, and Raman to ensure the apt synthesis of Iron-Z-A and to interpret the mechanism of adsorption-desorption of PO43− in an aqueous solution. EPR and XPS analysis confirmed that the iron was doped as Fe3+ in the LTA structure. The XPS peak shift (Fe-2p), FT-IR band shift, and intensity change (–OH) confirmed the existence of the ligand exchange mechanism. In the adsorption phase at pH 5, the derivative of phosphate (H2PO4−) acts as a ligand and interacts with OH of Fe on the zeolite surface to form “Iron-zeolite (oxy) hydroxide bound phosphate”. In the desorption phase at pH 10, phosphate ligand is detached and get mixed in the aqueous phase as HPO42−. The EDS data, Si–O–Al band shift and intensity change in FT-IR and XPS peak intensity change proved the contribution of Al in the process of adsorption. The data of adsorption fitted well with the Langmuir’s isotherm and pseudo-second-order kinetic model. The amount of PO43− adsorbed was a function of adsorbent’s surface area regardless of concentration. The amount of PO43− being adsorbed by the metal ions was found to be 382.296 mg PO43−/g Fe and 56.296 mg PO43−/g Al.

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Section: Introductionmentioning

confidence: 99%

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

et al. 2019

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“…We have shown previously that binding of targets by these sorbents can be described by a phenomenological model such as the Langmuir-Freundlich formulation [ 20 , 28 , 29 ],

where q is the amount of target bound per unit sorbent surface area, L is the free ligand, k is the affinity coefficient, n is the homogeneity factor, and A is the total sorbent surface area. The typically used saturation capacity is q s .…”

Section: Resultsmentioning

confidence: 99%

Improving Sorbents for Glycerol Capture in Biodiesel Refinement

et al. 2017

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Biodiesel is produced by transesterification of animal fat, vegetable oil, or waste cooking oil with alcohol. After production costs, the economic viability of biodiesel is dependent on what steps are necessary to remove impurities following synthesis and the effectiveness of quality control analysis. Solid-phase extraction offers a potentially advantageous approach in biodiesel processing applications. Nanoporous scaffolds were investigated for adsorption of glycerol, a side product of biodiesel synthesis that is detrimental to engine combustion when present. Materials were synthesized with varying pore wall composition, including ethane and diethylbenzene bridging groups, and sulfonated to promote hydrogen bonding interactions with glycerol. Materials bearing sulfonate groups throughout the scaffold walls as well as those post-synthetically grafted onto the surfaces show notably superior performance for uptake of glycerol. The sorbents are effective when used in biodiesel mixtures, removing greater than 90% of glycerol from a biodiesel preparation.

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“…Figure 3a presents data from RNA adsorption experiments and the calculated binding isotherms for N5. As in past studies of this type, adsorption of target using varied target and sorbent concentrations provides sampling across a larger region of the binding space and allows for generation of fit parameters with greater confidence [48].…”

Section: Target Adsorption and Elutionmentioning

confidence: 99%

“…The MSNs provided enhanced stability for extended periods allowing the adsorbed RNA to be eluted using simple buffers and employed directly for downstream molecular diagnostic assays. While promising, the RNA recovery rates from these MSNs were not ideal (less than 25%) [48]. The goal of the ongoing effort is to control interactions with the nucleic acids that result in degradation.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Elution of Nucleic Acids: Mesoporous Materials and Methods

Lin¹,

Johnson²,

Melde³

et al. 2017

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Physical protection of nucleic acids from the environment for improved stability through encapsulation or adsorption has been reported using various materials, including liposomes, metal particles, mesoporous silica nanoparticles, and polymers. In an extension of that approach, our previous study demonstrated the potential of mesoporous silica nanoparticles with and without covalently attached stabilizing reagents, such as sugar and bovine serum albumin, for improving the stability of RNA. The goal of the current study is to evaluate the potential of silicate sorbents bearing chemical functionalities for stabilization of nucleic acid targets. Materials offering charged groups, metal chelating sites, and -bonding sites are considered. Adsorption and elution of RNA, DNA, and single stranded DNA (ssDNA) are evaluated as is subsequent elution of the bound target. A sorbent functionalized with primary amine groups showed promising results for RNA and ssDNA stabilization. The impact of the sorbents on long term viability the targets is also evaluated. Storage of adsorbed targets at room temperature and 37 ∘ C over a period of 200 d indicates the potential for stabilization of RNA and ssDNA using several of the functionalities. None of the sorbents improved the stability of DNA either under room temperature or 37 ∘ C storage.

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Adsorption of organophosphates from solution by porous organosilicates: Capillary phase-separation

Cited by 20 publications

References 39 publications

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Improving Sorbents for Glycerol Capture in Biodiesel Refinement

Adsorption and Elution of Nucleic Acids: Mesoporous Materials and Methods

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