Separation Media Research Articles

Modeling the CO2 separation capability of poly(4-methyl-1-pentane) membrane modified with different nanoparticles by artificial neural networks

Membranes are a potential technology to reduce energy consumption as well as environmental challenges considering the separation processes. A new class of this technology, namely mixed matrix membrane (MMM) can be fabricated by dispersing solid substances in a polymeric medium. In this way, the poly(4-methyl-1-pentene)-based MMMs have attracted great attention to capturing carbon dioxide (CO2), which is an environmental pollutant with a greenhouse effect. The CO2 permeability in different MMMs constituted of poly(4-methyl-1-pentene) (PMP) and nanoparticles was comprehensively analyzed from the experimental point of view. In addition, a straightforward mathematical model is necessary to compute the CO2 permeability before constructing the related PMP-based separation process. Hence, the current study employs multilayer perceptron artificial neural networks (MLP-ANN) to relate the CO2 permeability in PMP/nanoparticle MMMs to the membrane composition (additive type and dose) and pressure. Accordingly, the effect of these independent variables on CO2 permeability in PMP-based membranes is explored using multiple linear regression analysis. It was figured out that the CO2 permeability has a direct relationship with all independent variables, while the nanoparticle dose is the strongest one. The MLP-ANN structural features have efficiently demonstrated an appealing potential to achieve the highest accurate prediction for CO2 permeability. A two-layer MLP-ANN with the 3-8-1 topology trained by the Bayesian regulation algorithm is identified as the best model for the considered problem. This model simulates 112 experimentally measured CO2 permeability in PMP/ZnO, PMP/Al2O3, PMP/TiO2, and PMP/TiO2-NT with an excellent absolute average relative deviation (AARD) of lower than 5.5%, mean absolute error (MAE) of 6.87 and correlation coefficient (R) of higher than 0.99470. It was found that the mixed matrix membrane constituted of PMP and TiO2-NT (functionalized nanotube with titanium dioxide) is the best medium for CO2 separation.

Adsorption of rare earth elements onto diatomite M45: Experimental investigations and modeling with statistical physics theory

The separation of rare earth elements using diatomite M45 from aqueous solutions was studied. The experimental isotherms for the adsorption of trivalent lanthanum, cerium, and neodymium cations on this adsorbent were quantified under strongly acidic conditions (pH 2) at 298–328 K. The adsorption equilibria of these earth elements were analyzed using two statistical physics models (homogeneous and heterogeneous monolayer models). The results show that the adsorption of these ions implies a multi-ionic mechanism, which is exothermic. Si-containing functional groups are responsible for the adsorption of these rare-earth elements on the diatomite surface. A heterogeneous statistical physics model confirms that two Si-based functional groups participate in the separation of these cations. The calculated adsorption capacities at saturation follow the order: neodymium > cerium > lanthanum. Calculated interaction energies range from 28600 to 40100 J/mol, indicating physical adsorption on diatomite M45. This study demonstrates that diatomite M45 is a promising separation medium that can be used for the recovery of REEs dissolved in aqueous solutions via adsorption.

A novel dynamic coating medium for single stranded DNA separation in capillary electrophoresis: Thermosensitive hydrogel nanoparticles

Nowadays, research on single-stranded DNA (ssDNA) requires a quick, effective and easy operation method to separate small ssDNA fragments from the organism and ssDNA production process to realize their application in gene therapy and drug diagnosis. Herein, a novel separation matrix of thermosensitive hydrogel nanoparticles (NPs) was proposed, which has been successfully applied to the isolation of biomacromolecules such as enzymes, peptides and proteins, based on the desirable properties of various monomers and advantages, such as high sieving capacity, tunability of hydrophilic and hydrophobic performance and non-toxicity. The flexible particles were prepared by precipitation polymerization method in aqueous solution while N-isopropylacrylamide (NIPAm), acrylic acid (AAc) and N-t-butyl acrylamide (TBAm) was performed as co-monomer, which were first used as the dynamic coating to separate small fragments of ssDNA in capillary electrophoresis (CE). The synthesized NPs were bound to the inner wall of the capillary through non-covalent interactions forming stable dynamic coating to affect the electroosmotic flow and improve the separation reproducibility of ssDNA fragments. Based on the formulation design of NPs and condition optimization of electrophoresis, the running buffer TG (25 mM Tris, 192 mM glycine, pH 8.3) was modified by 4 mg·mL−1 optimized NPs aqueous suspension addition while its molar feed ratio of NIPAm /AAc /TBAm /BIS was 83/5/10/2 and particle size was about 214 nm. Both the formulation design and temperature sensitivity of hydrogel nanoparticles contributed to the DNA separation efficiency. The designed NPs with low viscosity provide an approach to increase their capability as the separation medium for small fragment DNA with important physiological functions great potential and promise.

Defective UiO-66-NH2 monoliths for optimizing CO2 capture performance

Zirconium-based metal–organic frameworks (Zr-MOFs) have been considered promising sorbents for guest adsorption owing to their high porosity, structural and chemical versatility, and exceptional stability. Nevertheless, issues with the powder and the modest CO2 adsorption remain as major challenges for their use in industrial processes. Herein, a series of defective monolithic UiO-66-NH2 xerogels (G66-NH2-X) are prepared via adjusting the modulator concentration, featuring tunable porous structure, simple and scalable preparation process and high space–time yield. With a change in the modulator concentration, the missing linker deficiency varies from 0.57 to 1.80 per secondary building unit. The porosity and CO2 uptake capacity of the adsorbents are strongly affected by the defect concentration. At 25 ℃ and 1 bar, the defective G66-NH2-12 exhibits optimal CO2 adsorption capacity of ∼ 2.50 mmol/g and CO2/N2 ideal adsorbed solution theory selectivity of ∼ 33, exceeding those of many other CO2 benchmark adsorbents. Moreover, the G66-NH2-X adsorbents can be easily regenerated with obtained lower isosteric heat of adsorption (Qst) and show excellent sustainability of up to ∼ 99% even after five adsorption–desorption cycles. This provides a solid foundation for the development of defective granular G66-NH2-X adsorbents as future CO2 adsorption and separation media.

Social Media Use and its impact on Egyptian MSMEs’ Growth

Micro, small and medium enterprises (MSMEs) have benefited significantly from the use of social media (SM) in reaching customers and growing sales in a most efficient way. This study compares Facebook and Instagram as two separate social media platforms and examines to what extent the use of each of these SM platforms affects the growth of MSMEs. It distinguishes financial growth and non-financial growth and uses two theories to conceptualize the relations within the context of social media usage: the Social Exchange Theory (SET) and the Task Technology Fit (TTF) Theory. Results of the quantitative and qualitative analysis based on data of 383 MSMEs show that using social media (SM) has helped MSMEs achieve both financial and non-financial growth. Facebook, more specifically, leads to financial growth (higher sales volume in the short-term), while Instagram leads to more customer engagement and higher brand performance, with the positive and significant moderating effect of the length of social media use.

Influence of Lennard-Jones Parameters in the Temperature Dependence of Real Gases Diffusion through Nanochannels.

Umbrella Sampling Molecular Dynamics has been used to determine transition energies for different guest molecules through hydroquinone β-clathrate nanochannels, as well as their temperature trend. This clathrate has been shown to successfully enclathrate different types of small gases with remarkable selectivity, and thus it has been proposed as a potential gas separation and storage medium. Most of these potential guest gases can be successfully modeled as single Lennard-Jones spheres. Then, to obtain a general view of diffusion probabilities for different potential guest molecules, a comparative study for different virtual guest molecules described by different Lennard-Jones parameters has been performed. A regular temperature trend has been obtained for the transition energies for the molecular model characteristic parameter range explored. Finally, to locate the transition energy values of real gases within the space of phases explored, calculations have been repeated for molecular models of different noble gases and H2. The correlation results presented allow a wide interpolation ability for determining the transition energies of potential guest molecules stored or diffusing through the nanochannels of the studied clathrate structure.

Assessment of flow pattern and rheological properties of SF6 hydrate slurry

Sulfur hexafluoride (SF6) has extremely high global warming potential and must be separated and recovered to avoid its emission into the atmosphere. Hydrate-based gas separation, which uses only water as the separation medium and has low environmental impact, is expected to become a new separation and recovery technology for SF6. However, this technique has the drawback that hydrate particles in the slurry can block equipment piping. Therefore, this study investigated the flow pattern and rheological properties of SF6 hydrate slurry using a loop-tube flow apparatus. SF6 hydrate slurry was observed to have three flow patterns as the flow velocity varied: homogeneous flow, heterogeneous flow, and moving-bed flow. We developed experimental relationships based on the Turian–Yuan equation to estimate the flow velocities at which the flow patterns change. These experimental equations were able to predict these velocities within an error of approximately 10%. The rheological properties of SF6 hydrate slurry were found to exhibit Newtonian tendency at low solid fractions and pseudoplastic tendency at high solid fractions. The relative viscosity of the slurry could be estimated within 25% error using the Krieger–Dougherty model.

Fabrication and application of hydrangea-like magnetic titanium dioxide (Fe3O4–TiO2) particles: Development of magnetic “one-step” pretreatment method for multi-pesticide residues analysis in fish

Magnetic titanium dioxide (Fe3O4–TiO2) was prepared and utilized as the cleanup adsorbent and separation medium to modify the QuEChERS method, affording a facile, robust, and rapid magnetic “one-step” pretreatment method for the determination of multi-pesticide residues in fish. The pretreatment key parameters, such as the dosages of the purification adsorbents (Fe3O4–TiO2 and PSA), the dehydrating and salting out reagents, were systematically optimized by the orthogonal test method. Under the optimal conditions, satisfactory results of method evaluation were obtained. Good linearity of 127 target analytes was obtained from 1 to 250 μg L−1. The recoveries of 127 analytes at five spiked levels of 10, 25, 50, 125, and 250 μg kg−1 ranged from 71.0% to 129% with RSDs less than 15.0%. The method LOQs (MLOQs) of 127 analytes were 10 μg kg−1, meeting the requirement for multi-pesticide residues analysis in fish. Additionally, this magnetic “one-step” method was used for the analysis of multi-pesticide residues in real fish samples collected from Zhejiang Province, China. In summary, this method can work as a viable tool for multi-pesticide residues monitoring in fish.

Composing Real Time Adapting Weather Music based on Nyquist

Contemporarily, as computer music is becoming more popular, plenty of people start to make their own music through the computer. In general, there are so many different types of software or language for people to use to create music. In this paper, we will introduce several basic lines that one can use for making music in terms of Nyquist, and the sound one can produce in Nyquist. The main idea of this paper is to create different pieces of main melodies and add sound effects according to the data obtained from a website related to weather conditions of Earth. By completing the work, we will demonstrate the way to create new scores by writing codes, abstract real time data from a separate media and letting it control the codes on Nyquist. The application of this product can help people emotionally and offer a tool and a direct feel of the variation of the planet by using acoustic techniques. However, there are still limitations that restricts the project from having a higher value, and worth more study and development in the future. These results shed light on further developments in creating music that will change and adapt according to a real time data.

Methacrylate bonded covalent organic framework monolithic column online coupling with high-performance liquid chromatography for analysis of trace estrogens in food

Covalent organic frameworks (COFs) are a burgeoning class of crystalline porous materials with unique properties and have been considered as a promising functional extraction medium in sample pretreatment. In this study, a new methacrylate-bonded COF (TpTh-MA) was well designed and synthesized via the aldehyde-amine condensation reaction, and the TpTh-MA was incorporated into poly (ethylene dimethacrylate) porous monolith by a facile polymerization reaction inside capillary to prepare a novel TpTh-MA monolithic column. The fabricated TpTh-MA monolithic column was characterized with scanning electron microscope, Fourier transform infrared spectrometer, X-ray diffraction, and N2 adsorption–desorption experiments. Then, the homogeneous porous structure, good permeability and high mechanical stability of TpTh-MA monolithic column was used as separation and enrichment media of capillary microextraction, which was coupled with high-performance liquid chromatography fluorescence detection for online enrichment and analysis of trace estrogens. The main experimental parameters influencing the extraction efficiency were systematically investigated. The adsorption mechanism for three estrogens was also explored and discussed based on hydrophobic effect, π-π affinity and hydrogen bonding interaction, which contributed to its strong recognition affinity to target compounds. The enrichment factors of the TpTh-MA monolithic column micro extraction method for the three estrogens were 107–114, indicating a significant preconcentration ability. Under optimal conditions, a new online analysis method was developed and exhibited good sensitivity and wide linearity range of 0.25–100.0 µg·L-1 with a coefficient of determination (R2) higher than 0.9990 and a low limit of detection with 0.05–0.07 µg·L-1. The method was successfully applied for online analysis of three estrogens of milk and shrimp samples and the recoveries obtained from spiking experiments were in range of 81.4–113% and 77.9–111%, with the relative standard deviations of 2.6–7.9% and 2.1–8.3% (n = 5), respectively. The results revealed the great potential for the application of the COFs-bonded monolithic column in the field of sample pretreatment.

PH Effects of Soda, Brew, and Citrus on Adhesive Bond Strength of Orthodontic Brackets to the Enamel. Scanning Electron Microscopy and Adhesive Remnant Index Analysis

Aim: To assess the effects of milk tea, carbonated drink, orange juice, and artificial saliva on the shear bond strength (SBS) of orthodontic brackets and assess their mode of failure under a scanning electron microscope (SEM). Material and Methods: Eighty non-carious extracted premolars were disinfected, etched, had primer applied and cured, and bracket bonded with light cure composite adhesive. These teeth were then immersed in separate media of milk tea, carbonated drink, orange juice, and artificial saliva for 10 minutes per day for three months. After which, they were thermocycled and subjected to shear stress in the Universal testing machine, and the shear load was recorded. Following debonding, the teeth were analyzed under SEM for failure analysis using adhesive remnant Index (ARI). Data were analyzed using ANOVA and Tukey multiple comparison tests. Results: Carbonated drink and milk tea showed comparable shear bond strength which differed significantly from that of orange juice and artificial saliva. Conclusion: Carbonated drink had the most erosive effect on the tooth’s surface and showed the least shear bond strength and adhesive remnant score than the teeth immersed in other media.

Constructiveness of constructive journalism in a conflict-generating social-communication environment

The article considers the potential communication possibilities of such a new media phenomenon as constructive journalism / solution journalism in relation to its impact on the level of conflict-genicity of the social-communication space. the prospects of constructive journalism / solution journalism in overcoming the competition of classical journalism with social media and overcoming the crisis of traditional journalism are also analyzed. Reflections on the potential of traditional journalism in the aspect of reducing the level of conflict-genicity of the social and communication environment in the article unfold against the background of ideas about the receptive requests of the modern media audience for quality, verified, exclusive and useful information and appear to be justified and relevant in the context of the analysis of the communication potential of constructive journalism / solution journalism as a new media phenomenon. Constructive journalism / solution journalism is a new trend in the field of journalism, which is characterized by several fundamental features that give grounds for asserting that it is able to provide a new impetus to overcome competition with non-professional journalism and help professional media activity to get out of the crisis in which it found itself and satisfy the above-described audience requests. 1. Constructive journalism is a “revision” of journalistic intentions and opportunities for communicating with the media audience and restoring social dialogue. 2. Constructive journalism is a new approach to journalism. 3. Constructive journalism is a new journalistic proposal regarding the communicator in the process of mass communication. 4. Constructive journalism is an effective competition of professional mass media activity with the information activity of social media. Constructive journalism / solution journalism can be implemented in the form of separate materials in traditional mass media, separate sections in traditional mass media with the appropriate name, and also as separate media projects. Constructive journalism / solution journalism is able to reduce the conflict-genicity of the social communication environment because it has the potential and prospects to make the position of the media audience more adequate, reducing the level of its emotional instability and expanding the field of perceived and adequately seen phenomena, processes, issues of the current socio-cultural life. In the variant of constructive journalism, professional mass media activity can show, explain, explain the position of the “other”, so that it becomes less distant, less unacceptable, more tolerated where there is a prospect of avoiding collision and confrontation. Reducing the level of conflict-genicity of the social-communication space should become a special communication intention, which fits constructive journalism in particular.

Gradient to sectioning CUBE workflow for the generation and imaging of organoids with localized differentiation

Advancements in organoid culture have led to various in vitro mini-organs that mimic native tissues in many ways. Yet, the bottleneck remains to generate complex organoids with body axis patterning, as well as keeping the orientation of organoids during post-experiment analysis processes. Here, we present a workflow for culturing organoids with morphogen gradient using a CUBE culture device, followed by sectioning samples with the CUBE to retain information on gradient direction. We show that hiPSC spheroids cultured with two separated differentiation media on opposing ends of the CUBE resulted in localized expressions of the respective differentiation markers, in contrast to homogeneous distribution of markers in controls. We also describe the processes for cryo and paraffin sectioning of spheroids in CUBE to retain gradient orientation information. This workflow from gradient culture to sectioning with CUBE can provide researchers with a convenient tool to generate increasingly complex organoids and study their developmental processes in vitro.

The AERosol and TRACe gas Collector (AERTRACC): an online-measurement-controlled sampler for source-resolved emission analysis

Abstract. Probing sources of atmospheric pollution in complex environments often leads to the measurement and sampling of a mixture of different aerosol types due to fluctuations of the emissions or the atmospheric transport situation. Here, we present the AERosol and TRACe gas Collector (AERTRACC), a system for sampling various aerosol types independently on separate sampling media, controlled by parallel online measurements of particle, trace gas, and meteorological variables, like particle number or mass concentration, particle composition, trace gas concentration, and wind direction and speed. AERTRACC is incorporated into our mobile laboratory (MoLa) which houses online instruments that measure various physical and chemical aerosol properties, as well as trace gas concentrations. Based on preparatory online measurements with the whole MoLa setup, suitable parameters measured by these instruments are used to define individual sampling conditions for each targeted aerosol type using a dedicated software interface. Through evaluation of continuously online-measured data with regard to the sampling conditions, the sampler automatically switches between sampling and non-sampling for each of up to four samples, which can be collected in parallel. The particle phase and gas phase of each aerosol type, e.g., source emissions and background, are sampled onto separate filters with PM1 and PM10 cutoffs and thermal desorption tubes, respectively. Information on chemical compounds in the sampled aerosol is obtained by means of thermal desorption chemical ionization mass spectrometry (TD-CIMS) as the analysis method. The design, operation, and characterization of the sampler are presented. For in-field validation, wood-fired pizza oven emissions were sampled as targeted emissions separately from ambient background. Results show that the combination of well-chosen sampling conditions allows more efficient and effective separation of source-related aerosols from the background, as seen by the increases of particle number and mass concentration and concentration of organic aerosol types, with minimized loss of sampling time compared to alternative sampling strategies.

Open-cell PDMS polyHIPEs prepared using polymethylvinylsiloxane to prevent pore collapse

Polymerized high internal phase emulsions (PolyHIPEs) are porous polymers made using an emulsion template. Our group has previously shown that polydimethylsiloxane (PDMS) polyHIPEs prepared using a thiol-ene crosslinking reaction could obtain a maximum total porosity of ∼63%. Attempting to increase total porosity by increasing the volume fraction dispersed phase resulted in collapse of the porous material due to the soft nature of PDMS. In this work, polymethylvinylsiloxane (PMVS) was synthesized to impart high crosslinking density in the network. This polymer can be blended with divinyl-PDMS in the continuous phase to obtain a large range of storage moduli (25–900 kPa) in the final polyHIPEs with higher total porosity (74–77%). Finally, the use of these PDMS PolyHIPEs as separation media for oil/water mixtures has been demonstrated.

Aligned porous Chitosan/Ti3C2 MXenes monolith as a high-performance fixed-bed separation medium toward globular albumin separation

Designing and tuning macropores into aligned structure is of considerable importance in promoting mass transfer, improving chromatographic performance and enhancing column efficiency. Herein, we have synthesized an innovative aligned porous Chitosan/Ti3C2 MXenes monolith via a facile, versatile and reproducible unidirectional “freeze-casting” method. Typically, the accumulation of Ti3C2 MXenes directs the formation of aligned structure during the unidirectional freezing process and thus aligned macropores are formed by a subsequent freeze-drying process. By various physical characterization, the distribution of aligned macropores, micropores and specific surface area are determined to be 21 μm, 2.53 nm and 103.09 m2·g−1, respectively. In addition, monolith bed permeability is calculated to be 1.94 × 10-12 m2, approximately 10 times than conventional monolith. Batch adsorptive experiments confirm that adsorptive capacities to bovine serum albumin and bovine hemoglobin are remarkably elevated on account of the high affinity of proteins onto those imbedding Ti3C2 MXenes. Meanwhile, continuous mass transfer equation describes the aligned macropores facilitate the film mass transfer factor ([kLa]f) in a separation process thus driving the global mass transfer factor ([kLa]g). It is expected that the aligned porous Chitosan/Ti3C2 MXenes monolith promises great potential for a continuous separation of proteins when a wholesale production is required.

PROPOSED STRATEGY TO OBTAIN OPTIMUM INTER-STATION DISTANCE FOR GPS CORS DEVELOPMENT SCENARIO

Abstract. The critical part in the development of GPS CORS network is known as the inter-station distance between the CORS or baseline length. Due to the diversity of baseline length can be implemented for the CORS network, this paper presents an alternative strategy to obtain the optimum inter-station distance between the CORS. The optimum inter-station distance between the CORS can be achieved by analysing the quality of GPS baseline data and applying GPS CORS Optimal Prediction Number Calculator (ONPC). Three baselines have been designed with appropriate range of baseline length which short (0–30km), medium (30–70km) and long (70–180km) baselines in order to examine the quality of GPS data and GPS CORS ONPC. The GPS baseline data quality analysis presents the performance of short, medium, and long baselines in term of percentage of ambiguity resolution (AR) and separated medium of GPS distance-dependent errors. The GPS CORS ONPC shows the distribution of CORS network using the length of short, medium, and long baselines within the frame and the total cost required for the establishment of the CORS network. From the result, it is found that the short and medium baselines have superior performances in term of GPS data quality which has stated higher success rate of AR (more than 50 percent) and less than 1cm standard deviation for dispersive and non-dispersive medium of GPS distance-dependent errors compared to long baseline. However, in term of cost, the longer baseline stated the cheapest, followed by medium baseline and short baseline which is 12 times and 182 times greater than longer baselines respectively. Therefore, the medium baseline is chosen as optimum inter-station distance in the development of CORS network due to better coverage and satisfied quality of GPS data with acceptable cost.

Switchable Separation Strategy via Host–Guest Locks

Universal separation strategies are the ultimate goal in separation science. However, there is always a tradeoff between universality and selectivity due to the negative influence among different recognition domains. With the goal of universal separation in mind, an unprecedented, switchable, and versatile separation strategy using reversible supramolecular host-guest interactions has been developed. These adjustable separation mediums were prepared using surface-grafted cationic cyclodextrin to firmly bind negatively charged adamantane derivatives. By changing guest structures, the surface functionality of the separation medium can be precisely regulated to be selective for a variety of substrates including chiral or achiral molecules, thus producing satisfactory single-column universality. This method offers a new approach to move beyond conventional separation methodologies and should stimulate the design of switchable functional materials.

Fabrication and application of Zn5 functionalized copolymer monolithic column for pipette tip micro-solid phase extraction of 4 polycyclic aromatic hydrocarbons in edible oil

The contamination of polycyclic aromatic hydrocarbons (PAHs) in edible oil is a health threat. Thus, trace analysis of PAHs is of high necessity. Based on the efficient adsorption of PAHs on Zn5 metal cluster, a Zn5 functionalized copolymer monolithic column was rationally designed for pipette tip micro-solid phase extraction (μ-SPE). The modified Zn5 improved the adsorption selectivity and capacity of the monolith for naphthalene, phenanthrene, fluoranthene and pyrene. Chemical doping and copolymerization stabilized the monolith with a long life. Under optimal extraction conditions, a μ-SPE-high performance liquid chromatography with ultraviolet detector method was established for the detection of 4 PAHs in edible oils. The method yielded detection ranges of 0.15–250 μg L−1 (R2 > 0.997), detection limits of 0.050–1.5 μg L−1, satisfactory recoveries (86.3–101.5 %), and high precisions (RSDs < 7.9 %). The results indicated that the Zn5 functionalized copolymer monolithic column was an ideal separation medium for the detection of PAHs residues in edible oils.

High Gradient Magnetic Separation of Pure Gd2O3 Particles from Pure La2O3 Particles

Rare earth oxides such as La2O3 and Gd2O3 are abundant in waste optical glass. The separation of rare earth oxides is beneficial to the recycling of rare earth resources. In this study, the rare earth oxide Gd2O3 particles were separated from La2O3 particles using high gradient magnetic separation, and the influence of different fluid media (i.e., water, anhydrous ethanol, and their mixture) on the separation results was investigated. By using the measured zeta potential of oxide particles in water/ethanol of different pH and water with different dispersants (Na2SiO3 9H2O, citric acid, Na2CO3, and sodium hexametaphosphate), the DLVO (Derjaguin–Landau–Verwey–Overbeek) potential calculations and their analysis applied to high gradient magnetic separation results were also performed. The results showed that using anhydrous ethanol or adding a dispersant in water as a fluid medium can promote the separation of magnetic Gd2O3 particles under a high-gradient magnetic field. Among the different conditions, anhydrous ethanol can improve the grade of Gd2O3 to 95% from 70% with water. Furthermore, ethanol can be reused after filtration, making it an environmentally friendly fluid medium. Among the four dispersants, sodium hexametaphosphate, Na2SiO3, and Na2CO3 can also increase the separation rate of La2O3 and Gd2O3 to about 95%. The effect of citric acid on the separation performance is slightly worse, and the recovery rate of Gd2O3 is 80%. This study provides a new reference for selecting a fluid medium for magnetic separation.