Selective Sorbent Research Articles

Selective capture and determination of doxycycline in marine sediments by using magnetic imprinting dispersive solid-phase extraction coupled with high performance liquid chromatography.

Antibiotics are frequently used in aquaculture as feed additives and finally enter the marine environment that can pose potential threat to humans. In this study, magnetic molecularly imprinted nanocomposites were prepared by surface imprinting and applied as selective sorbents for specific capture of doxycycline. A multivariate approach based on response surface methodology with Box-Behnken design was adopted to optimize the dispersive solid-phase extraction of doxycycline from marine sediment. Three key parameters, including adsorbent amount and type of washing/eluting solvent, were screened. Under optimum conditions, the limit of detection was 0.03μgg-1 with good linearity from 0.5 to 20μgg-1 followed by HPLC detection. Finally, two sediment samples were analysed and satisfactory recoveries between 90.60% and 93.76% were obtained with acceptable relative standard deviations (≤4.12%), suggesting a promising applicability of the developed method for efficient extraction and sensitive quantification of antibiotics in complex marine environmental matrix.

Nitrogen replacement strategy to efficiently enhance methane recovery of the methane purification process using nitrogen equilibrium selective sorbent

MIL-100(Cr) is a very promising sorbent based on an equilibrium effect for rejecting nitrogen from substandard quality natural gas. In this work, methane purification from a 25% N2/75% CH4 mixture has been studied using MIL-100(Cr) as a sorbent, on the basis of which an N2 displacement-assisted vacuum-pressure swing adsorption (N2DIS-VPSA) process is proposed. Adsorption equilibrium isotherms of N2 and CH4 have been measured over MIL-100(Cr) powder and pellets, and N2/CH4 selectivity has also been calculated based on ideal adsorbed solution theory (IAST). A rigorous mathematical model has been used to investigate gas- and solid-phase concentration evolution histories to deeply understand the internal mechanism of the N2 replacement process. Breakthrough experiments have revealed that a returned N2 flow could replace almost all of the co-adsorbed CH4, greatly improving the CH4 recovery. At the same time, both experimental and simulation results showed that the N2 replacement process had no effect on the purity of CH4. However, it should be noted that an excessively long N2 replacement time led to incomplete subsequent regeneration of the sorbent, thereby reducing the purity of CH4 in the N2DIS-VPSA process. By optimizing the N2 replacement duration, a high purity CH4 (97%) product gas could be obtained with 92% recovery, much higher than that of MIL-100(Cr) applied into common PSA process (58%).

Polymer ligands of taurine – New class of high selective sorbents for exctraction of silver from multicomponent solutions

The systematic study on the properties of the taurine polymer ligand has made it possible to determine the influence of the structure of the sorbents on their selective properties towards silver (I). It has been shown that an increase in the degree of modification of the sulfoethyl groups resulted in an increase in the selectivity of silver(I) sorption from multicomponent solutions onto the materials based on polyallylamine (the values of the KAg/Cu selectivity coefficients for the sorbent with the maximum degree of modification exceeded 103). Sorbents based on polyethyleneimine, unlike other sulfoethylated aminopolymers, are appropriate materials for the group extraction of a number of transition metal ions. The pKa values of amino groups in the composition of sorbents based on poly(N-2-sulfoethyl)ethylenimine and poly(N-2-sulfoethyl)allylamine were determined, and a correlation between the acid-base and selective properties of sorbents was established. A significant effect of the nature of the aminopolymer matrix on the selectivity of sorption was revealed, and recommendations were formulated for the use of N-derivative of taurine polymer ligand in separation and preconcentration processes.

Computational Design for The Development of Monomer Selectivity to α-Mangostin in Molecularly Imprinted Polymer

α-mangostin is the largest content in Garcinia mangostana rind, which has a wide range of biological activities and pharmacological properties. The extraction process to separate α-mangostin from complex matrices requires selectivity. A novel method of molecularly imprinted polymer (MIP) has characterization high selectivity, high stability, and low cost. MIP uses as a selective sorbent with adsorption method that α-mangostin has the higher binding capacity and specific recognition with MIP. The computational approach was developed to study monomer selectivity towards α-mangostin as a template for rational MIP design. The purpose of this research is to study molecular interaction between template and monomer and monomer template ratio optimization in computational design to find the best pre-polymerization complex for MIP preparations. The structure of α-mangostin and nine functional monomers was drawn using Marvin Sketch and then optimized by Hyperchem 8.0.10 software. Monomer positions are placed on the template structure in various complex ratios. Each conformation was calculated using a semi-empirical PM3 simulation method to obtain the lowest bond free energy. The results showed that the α-mangostin-methacrylic acid complex with 1:6 molar ratio had the most stable structure, the most hydrogen bonds, and the highest ∆G was -27.5114588 kcal/mol. This study presented a method of selecting numerous functional monomers and determining appropriate monomer ratios with a template to obtain MIP for α-mangostin.

Recruiting chemical grafting method for surface modification of stainless steel to fabricate a selective sorbent for solid phase microextraction of mercury metal ion.

Keeping selectiveness and efficiency in view with solid-phase microextraction (SPME) of metal ions, this work was aimed at synthesis of a novel modified sorbent on a stainless-steel surface to fabricate a selective and efficient fiber for SPME of mercury ions from real food and biological samples. After the confirmation of sorbent structure grafted on the stainless-steel surface, by different techniques, the synthesized fiber was utilized for extraction and preconcentration of mercury before its measurement by an inductively coupled plasma-optical emission spectroscopy (ICP-OES). For optimizing the efficiency, the influences of various factors on the extraction of Hg (II) ion were scrutinized. The optimized values used for extraction were pH 7.0, adsorption time 8min, desorption time 5min, 5mL of eluent solvent containing nitric acid with concentration of 0.5mol L-1, and stirring rate of 300rpm. Underneath optimum condition, the relative standard deviation for 30 extractions, done by one synthesized fiber, was calculated to be 2.89% and for five extractions, done by 5 synthesized fibers, was calculated to be 1.78%. The high performance of the synthesized fiber was checked with high recoveries obtained from 30 successive sorption-desorption cycles, using a unique synthesized fiber. Finally, the suggested procedure was triumphally exploited for extraction and pre-concentration of Hg (II) ion in real food and biological samples.

Factors Affecting the Analytical Performance of Magnetic Molecularly Imprinted Polymers.

During the last few years, separation techniques using molecular imprinting polymers (MIPs) have been developed, making certain improvements using magnetic properties. Compared to MIP, Magnetic molecularly imprinted polymers (MMIPs) have high selectivity in sample pre-treatment and allow for fast and easy isolation of the target analyte. Its magnetic properties and good extraction performance depend on the MMIP synthesis step, which consists of 4 steps, namely magnetite manufacture, magnetic coating using modified components, polymerization and template desorption. This review discusses the factors that will affect the performance of MMIP as a selective sorbent at each stage. MMIP, using Fe3O4 as a magnetite core, showed strong superparamagnetism; it was prepared using the co-precipitation method using FeCl3·6H2O and FeCl2·H2O to obtain high magnetic properties, using NH4OH solution added for higher crystallinity. In magnetite synthesis, the use of a higher temperature and reaction time will result in a larger nanoparticle size and high magnetization saturation, while a higher pH value will result in a smaller particle size. In the modification step, the use of high amounts of oleic acid results in smaller nanoparticles; furthermore, determining the correct molar ratio between FeCl3 and the shielding agent will also result in smaller particles. The next factor is that the proper ratio of functional monomer, cross-linker and solvent will improve printing efficiency. Thus, it will produce MMIP with high selectivity in sample pre-treatment.

Preparation of Molecular Imprinted Polymer Based on Chitosan as the Selective Sorbent for Solid-Phase Microextraction of Phenobarbital.

This study reports the construction of a novel SPME fiber based on chitosan and glutaraldehyde as coating material composites combined with high-performance liquid chromatography with an ultraviolet detector (HPLC-UV) for extraction and detection of phenobarbital. In this technique, the chitosan biopolymer, as a new coating of SPME fiber, was produced on the stainless-steel wire, using glutaraldehyde and phenobarbital as cross-linker and template, respectively. For comparison, a nonimprinted polymer was created using the same procedure to evaluate fiber selectivity (but without the addition of phenobarbital). The SPME-MIP fiber coating was characterized by field emission scanning electron microscopy, Fourier-transform infrared spectroscopy, and thermal gravimetric analysis. The efficiency of fiber was then improved by adjusting the impact of numerous factors such as pH, extraction time, desorption time, desorption solvent, and stirring rate. The results showed that the proposed fiber has a linear range of 0.01–4 μg·mL−1, and detection limit of 7.5 ng·mL−1. The average recoveries in the four concentration levels for the spiked river and well water samples were 95.7 and 95.3%, with relative standard deviations of 3.8 and 5.9% for single fiber and between fibers, respectively.

Catalytic Activity of Fibrous Complexites

The ecological situation in the world requires the solution of environmental problems associated with the processes of wastewater treatment, hydrogen sulfide pollution of various industrial facilities in order to remove such harmful impurities. The unpleasant odor that appears in industrial and adjacent waste processing areas is a constant concern for the protection of the environment. To solve these problems, it is advisable to use selective sorbents - complex. The introduction of metal ions into complex fibers due to the formation of a coordinated bond between the groups of the metal and the polymer ligand gives high molecular weight complex compounds. The operational and selective properties of the materials based on high-molecular-weight complex compounds can be determined by the type of metal ion introduced into macromolecules, the nature of the polymer chain, and thermodynamic stability. By changing the action of the above factors, complexites can be synthesized for use as highly selective catalysts for various chemical processes. The paper presents data on the catalytic activity of fibers with Cu2+, Co2+, Ni2+ ions with complexing fibers containing carboxyl, amidoxime, hydroxamic groups, using the example of the decomposition of hydrogen peroxide and oxidation of H2S, Na2S. An inhibitory effect on the oxidation of fiber functional groups in the pH range 5.5 - 12.5 was revealed. The operational and selective properties of materials based on complexites can be determined by the type of metal ion introduced into the macromolecules, by the nature of the polymer chain. By changing the action of the above factors, complexites can be synthesized to be used as highly selective catalysts for various chemical processes. It was found that the catalytic activity of the complex depends on pH, the stereochemistry of the coordination centers in the fiber matrix and significantly exceeds the activity of model low-molecular-weight complex compounds.

Magnetic solid-phase extraction based on the Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine followed by atomic absorption spectrometry for cadmium monitoring in water, tomato and cabbage samples

Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine (CCF/ZIF-71/Fe3O4/PTh) was fabricated, characterized, and applied as efficient magnetic sorbent in magnetic solid-phase extraction (MSPE) of cadmium from water and food samples before determination by flame atomic absorption spectrometry (FAAS). This modification of carbonized cotton fabric led to making a great surface area and porosity, increase extraction efficiency, and acceptable selectivity. The characterization of this proposed sorbent was performed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and Fourier transform-infrared (FT-IR) spectroscopy analysis techniques. The impact of several analytical parameters including pH, sorbent dosage, time of extraction, desorption condition, chelating agent concentration, the amount of salt and effect of potentially interfering ions on the selectivity and extraction recoveries of cadmium, were evaluated and optimized. In this proposed methodology, the limit of detection (LOD), the limit of quantification (LOQ), and relative standard deviation (RSD, n = 3) were found to be 0.21 ng mL−1, 0.6 ng mL−1 and lower than 3.0%, respectively. The validation and accuracy of the new advanced procedure were confirmed by applying the proposed procedure for certified reference materials (SRM1570A). Eventually, CCF/ZIF-71/Fe3O4/PTh can be utilized as a selective sorbent, for the rapid, accurate and sensitive determination of Cd (II) in the samples.

Ni-alginate hydrogel beads for establishing breakthrough curves of lead ions removal from aqueous solutions

The scientific impact of this work is the protection of the environment from hazardous pollutants using a column technique. Besides its higher stability at working pH and its time persisting, Ni-alginate has a higher ability to remove lead ions compared to the other prepared beads (Sr-alginate, Co-alginate, and Ca-alginate). Also, Ni-alginate possessed a higher removal percent, 93.3%, toward Pb2+ than the other ions, taking the sorption order of Pb2+ > Sr2+ > Co2+ > Cd2+ > Zn2+. Therefore, this study focused on using Ni-alginate as a selective sorbent for lead ions. Fixed-bed column was employed for the sorption process. The results for that efficiency are presented as breakthrough curves in view of the impact of various parameters; influent flow rate (1.5, 3.0, and 5.0 mL/min), lead concentration (100, 150, and 200 mg/L), and bed depth of sorbent (3.0, 5.0, and 7.0 cm). Breakthrough modeling including Thomas and Yan models was employed. The outcomes indicated that Thomas theory is more applicable. The overall outcomes indicated that Ni-alginate is recommended for selective removal of Pb2+ from waste solutions.

Preparation of Rosin-Based Composite Membranes and Study of Their Dencichine Adsorption Properties.

In this work, rosin-based composite membranes (RCMs) were developed as selective sorbents for the preparation of dencichine for the first time. The rosin-based polymer microspheres (RPMs) were synthesized using 4-ethylpyridine as a functional monomer and ethylene glycol maleic rosinate acrylate as a crosslinking. RCMs were prepared by spinning the RPMs onto the membranes by electrostatic spinning technology. The optimization of various parameters that affect RCMs was carried out, such as the ratio concentration and voltage intensity of electrospinning membrane. The RCMs were characterized by SEM, TGA and FT-IR. The performances of RCMs were assessed, which included adsorption isotherms, selective recognition and adsorption kinetics. The adsorption of dencichine on RCMs followed pseudo-second-order and adapted Langmuir–Freundlich isotherm model. As for the RCMs, the fast adsorption stage appeared within the first 45 min, and the experimental maximum adsorption capacity was 1.056 mg/g, which is much higher than the previous dencichine adsorbents reported in the literature. The initial decomposition temperature of RCMs is 297 °C, the tensile strength is 2.15 MPa and the elongation at break is 215.1%. The RCMs have good thermal stability and mechanical properties. These results indicated that RCMs are a tremendously promising adsorbent for enriching and purifying dencichine from the notoginseng extracts.

New boron selective sorbents for sorption – membrane hybrid system

The synthesis and properties of core-shell sorbents dedicated to the removal of borates from aqueous solutions were described. By modification of polymer matrices with vinylbenzyl chloride followed by its derivatization with N-methyl glucamine a new kind of sorbents were obtained. The testing of boron sorption reviled that the process efficiency was related to the pore diameter and the content of ligand in the sorbent. The best material for use in a hybrid system, where boron is absorbed by fine particles and removed in microfiltration, was Poropak Q with a specific surface area of 300 m2/g.

Surface Functionalized Magnetic Nanoparticles as a Selective Sorbent for Affinity Fishing of PPAR-γ Ligands from Choerospondias axillaris.

Coronary heart disease (CHD), which has developed into one of the major diseases, was reported to be treated by the target of peroxisome proliferators-activate receptor γ (PPAR-γ). As a natural medicine long used in the treatment of CHD, there are few studies on how to screen the target active compounds with high specific activity from Choerospondias axillaris. To advance the pace of research on target-specific active compounds in natural medicines, we have combined magnetic ligand fishing and functionalized nano-microspheres to investigate the active ingredients of PPAR-γ targets in Choerospondias axillaris. The PPAR-γ functionalized magnetic nano-microspheres have been successfully synthesized and characterized by vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The specificity, reusability, and reproducibility of the nano-microspheres were investigated with the help of the specific binding of rosiglitazone to PPAR-γ. In addition, the incubation temperature and the pH of the buffer solution in the magnetic ligand fishing were optimized to improve the specific adsorption efficiency of the analytes. Finally, with the aid of ultraperformance liquid chromatography plus Q-Exactive Orbitrap tandem mass spectrometry (UHPLC-Q-Exactive Orbitrap-MS/MS), the 16 active ligands including 9 organic acids, 5 flavonoids, and 2 phenols were found in the ethanolic extracts of Choerospondias axillaris. Therefore, the study can provide a successful precedent for realizing the designated extraction and rapid isolation of target-specific active ingredient groups in the complex mixtures.

Nanoarchitectonics of a MOF-in-Nanochannel (HKUST-1/TiO2) Membrane for Multitarget Selective Enrichment and Staged Recovery.

Enrichment and separation of specific endogenous molecules are essential for disease diagnosis and the pharmaceutical industry. Although many solid sorbents have been developed for target molecule enrichment, simultaneous separation of multitargets is still a challenge for adsorbents. In this study, we develop a multitarget selective sorbent based on a nanochannel membrane prepared by the anodization of a Ti-Cu alloy. The in situ growth of a metal-organic framework (MOF, herein using Cu-based HKUST-1) in the nanochannels enables the resulting MOF-in-nanochannel membrane to act as a nanofilter. Benefitting from the size-exclusion effect of MOFs and the distinct surface characteristics of each component in the HKUST-1/TiO2 nanochannels, the as-proposed membranes can be simply operated as a filter and exhibit satisfactory selectivities and enrichment capacities in the separation of aromatic amino acids, histidine-rich proteins, and phosphoproteins. More importantly, the adsorbed multitargets can be further controllably released from the membrane in a sequence via a staged recovery process. The use of this system is envisioned to provide an innovative and potential design for efficient sorption media for the selective enrichment and staged separation of specific biomolecules.

Silver ion functionalized covalent organic polymer for selective online solid phase microextraction of unsaturated fatty acid methyl esters

In this work, silver ion functionalized covalent organic polymer (COPTAPB-BPDA@SA@Ag+) was fabricated via the introduction of silver ion to COP, and utilized as selective sorbent for online SPME of unsaturated fatty acid methyl esters (UFAMEs). The synthesis of COPTAPB-BPDA@SA@Ag+ was confirmed by using the SEM, EDS, FT-IR, XRD and XPS characterization techniques. Due to the charge-transfer interaction between silver ion and C = C double bonds, COPTAPB-BPDA@SA@Ag+ displayed satisfactory extraction ability towards UFAMEs. Several SPME factors, such as ACN content in the sampling solution and eluent, sampling and elution flow rate, were investigated with respect to the extraction efficiency of UFAMEs. Under the optimized conditions, an online Ag+-SPME-Ag+-HPLC method for analysis of target trans-UFAMEs was proposed. A good linearity was established in the range of 0.04 ∼ 2 mg/kg for two target trans-UFAMEs in milk tea samples. The limits of detection (LODs) and limits of quantitation (LOQs) were not more than 8.8 μg/kg and 19 μg/kg respectively, while the intra-day RSDs (n = 3) and the inter-day RSDs (n = 3) were less than 2.1% and 2.9% respectively. The recoveries for the proposed method was ranged from 82.3% to 93.5% with RSDs (n = 4) less than 5.9%. The above results demonstrated the selective extraction of COPTAPB-BPDA@SA@Ag+ towards UFAMEs from complex real samples, as well as the satisfactory detection sensitivity for trans-fatty acids of the proposed method. This study provided a facile approach for the preparation of metal ion functionalized COP sorbent and showed its wide potential for sample preparation.

A Polysulfone/Cobalt Metal–Organic Framework Nanocomposite Membrane with Enhanced Water Permeability and Fouling Resistance

Ultrafiltration membranes are widely used in water and wastewater applications. The two most important membrane characteristics that determine the cost-effectiveness of an ultrafiltration membrane process are membrane permeability and fouling resistance. Metal–organic frameworks (MOFs) have been intensively investigated as highly selective sorbents and superior (photo) catalysts. Their potential as membrane modifiers has also received attention recently. In this study, a non-functionalized, water-stable, nanocrystalline mixed ligand octahedral MOF containing carboxylate and amine groups with a cobalt metal center (MOF-Co) was incorporated into polysulfone (PSF) ultrafiltration (UF) membranes at a very low nominal concentration (2 and 4 wt %) using the conventional phase inversion method. The resultant PSF/MOF-Co_4% membrane exhibited water permeability up to 360% higher than of the control PSF membrane without sacrificing the selectivity of the membrane, which had not been previously achieved by an unmodified MOF. In addition, the PSF/MOF-Co_4% membrane showed strong resistance to fouling by natural organic matter (NOM), with 87 and 83% reduction in reversible and irreversible NOM fouling, respectively, compared to the control PSF membrane. This improvement was attributed to the increases in membrane porosity and surface hydrophilicity resulting from the high hydrophilicity of the MOF-Co. The capability of increasing membrane water permeability and fouling resistance without compromising membrane selectivity makes the MOF-Co and potentially other hydrophilic MOFs excellent candidates as membrane additives.

Rapid effectual entrapment of arsenic pollutant by Fe2O3 supported on bimodal meso-macroporous silica for cleaning up aquatic system

Arsenic (As) contamination in aqueous media is a major concern due to its adverse impacts on humans and the ecosystem more broadly because of its non-biodegradability. Consequently, an effective and selective sorbent is needed urgently to scavenge As pollutant. Herein, the adsorption behaviors of As(V) by Fe2O3 and Fe2O3 supported on different silica materials, consisting of unimodal mesoporous silica (Fe2O3/U–SiO2) and dual meso-macroporous silica (Fe2O3/B–SiO2), were compared to examine their structure-efficiency relationships in the elimination of As(V). Fe2O3/B–SiO2 was much faster at As(V) removal and had an impressively higher uptake capability, reaching nearly 50% and 2.5 mg g−1 within 5 min compared to bare Fe2O3 (6% and 0.3 mg g−1) and Fe2O3/U–SiO2 (11.9% and 0.59 mg g−1). These better results were because of the highly dispersed Fe2O3 nanoparticles on the B–SiO2 support that provided abundant reactive sites as well as a macropore structure facilitating As(V) diffusion into adsorptive sites. The maximum adsorptive capacity of Fe2O3/B–SiO2 (4.7 mg As per 1 g adsorbent) was 1.3- and 1.7-fold greater than for Fe2O3/U–SiO2 and Fe2O3, respectively. The outstanding performance and reusability of Fe2O3/B–SiO2 with its ease of production, economical and environmentally friendly features made it even more attractive for As(V) remediation. The explored relationship between the structure of SiO2-supported Fe2O3 sorbents and their performance in removing As(V) could be informative for the future design of highly efficient adsorbents for the decontamination of water.

A novel magnetic molecularly imprinted polymer for selective extraction and determination of quercetin in plant samples

Molecularly imprinted polymers that mimic the binding mechanism of antibodies and their antigens exhibit several advantages, such as fast synthesis, low cost, high stability, and allow to overcome the ethical issues associated with antibody farming in animals. Herein, a novel strategy combining the magnetic molecularly imprinted polymer (MMIP) as an artificial antibody with a fluorescence procedure for the detection of quercetin in plant samples was designed. The MMIP was synthesized via a radical polymerization process to recognize specific functional groups of quercetin using a green technique based on high energy ultrasound irradiation. The developed MMIP was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning/transmission electron microscopy, and thermal gravimetric analysis, which confirmed the successful preparation of MMIP. The adsorption capacity and selectivity of the MMIP for quercetin and other interferents analogous were performed. The MMIP was applied in the solid-phase extraction (SPE) technique as a selective sorbent for the sample preparation. Besides, a sensitive fluorometric method for the quantitation of quercetin was developed. A linear response was obtained within the concentration of 0.005–1.25 μg mL−1 of quercetin. The limit of detection and quantitation were 1.1 ng mL−1 and 3.7 ng mL−1, respectively. The average recoveries for quercetin were between 92.2% and 104.7% with an RSD less than 5.06% in spiked orange juice and tea extract samples. Furthermore, the developed procedure was successfully combined with a new paper-based analytical device for on-site smartphone analysis of quercetin.

Synthesis and application of magnetic surface molecularly imprinted polymers in selective solid-phase extraction of epoxy triglyceride from deep frying oil

As the major oxidized triglycerides (ox-TGs), epoxy triglyceride is one of the toxic polar components from deep frying oil. However, the conventional methods are difficult to separate epoxy triglyceride from other ox-TGs due to their similar molecular and structures. To address the problem, a novel magnetic solid-phase extraction approach based on a surface molecularly imprinted polymers was developed. The polymers coated on Fe3O4 nanoparticles (Fe3O4@MIPs) were synthesized and used as highly selective sorbents for capture epoxy triglyceride from deep frying oil. They have high adsorption capacity (58.3 mg/g), stable equilibrium adsorption time (60 min) and excellent specificity. This method had a satisfactory linear relationship in the range of 0.2–10 mg/L (R2 = 0.997), and the detection limit of epoxy triglyceride was 0.0599 mg/L. Results indicated that Fe3O4@MIPs could not only specifically separate epoxy triglycerides, but also provided a potent idea for the separation of other ox-TGs from deep frying oil.

The Effect of the Synthesis Method on Physicochemical Properties of Selective Granular Polymer Sorbents

Investigation of the effect of the polymer synthesis method on physicochemical properties of sorbents is one of the topical problems in the chemistry of macromolecular compounds that has high scientific and practical interest. Determination of the optimal synthesis method will make it possible to create sorbents with physicochemical properties that led to the realization of effective sorption. In this work, we investigated the effect of synthesis methods (Pickering emulsion polymerization and precipitation polymerization in solution) of granular polymers based on 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate on physicochemical and sorption properties. The synthesis by Pickering emulsion polymerization led to improvement of the n-propyl alcohol diffusion into the polymer network and to the formation of more homogeneous and structurally stable polymer networks. Creating selective polymer networks by Pickering emulsion polymerization compared to precipitation polymerization in solution led to an increase in porosity, creation of more segregated surface of granules, improvement of binding sites availability at the temperature of 37 °C, and formation of the homogeneous sorption surface with high affinity to target molecules at 25 °C and 37 °C. Selective polymers synthesized by both polymerization methods had the largest values of available sorption surfaces areas for target molecules at 37 °C.