Adsorption Selectivity of Fatty Acid Collector by Synthetic Magnetite

2014 ◽  
Vol 552 ◽  
pp. 263-268
Author(s):  
Han Quan Zhang ◽  
Feng Ling Wang
Keyword(s):  
Fatty Acid ◽  
Sodium Oleate ◽  
Selective Adsorption ◽  
Indirect Measurement ◽  
Adsorption Rate ◽  
Separation Performance ◽  
Mineral Surface ◽  
Adsorption Selectivity ◽  
Synthetic Magnetite ◽  
Concentrate Grade

Selective adsorption of collectors on mineral surface can directly impact the flotation separation performance. Mineral flotation tests indicated that reverse flotation of synthetic magnetite can only bring a 2 to 4 percent increase in the concentrate grade, tailings grade remains high. The amounts of commonly used fatty acid collector, such as sodium oleate, adsorbed onto mineral surface are measured with indirect measurement to investigate adsorption selectivity of fatty acid collectors by synthetic magnetite. Results showed a higher selectivity in collector adsorption for natural magnetite, with 38.25% difference in the average adsorption rate of sodium oleate between the valuable minerals and gangue, but a less selective adsorption of fatty acid collector onto artificial magnetite, with only 1% difference in the average adsorption rate between its valuable and gangue.

Core-Shell Molecularly Imprinted Polymer Nanocomposites for Biomedical and Environmental Applications

2019 ◽  
Vol 25 (34) ◽  
pp. 3633-3644
Author(s):  
Nasrullah Shah ◽  
Saba Gul ◽  
Mazhar Ul-Islam
Keyword(s):  
Food Processing ◽  
Selective Adsorption ◽  
Environmental Applications ◽  
Core Shell ◽  
Template Molecule ◽  
Hollow Core ◽  
Imprinted Polymer ◽  
Adsorption Selectivity ◽  
Molecularly Imprinting Polymers ◽  
Relative Adsorption

: Core-shell polymers represent a class of composite particles comprising of minimum two dissimilar constituents, one at the center known as a core which is occupied by the other called shell. Core-shell molecularly imprinting polymers (CSMIPs) are composites prepared via printing a template molecule (analyte) in the coreshell assembly followed by their elimination to provide the everlasting cavities specific to the template molecules. Various other types of CSMIPs with a partial shell, hollow-core and empty-shell are also prepared. Numerous methods have been reported for synthesizing the CSMIPs. CSMIPs composites could develop the ability to identify template molecules, increase the relative adsorption selectivity and offer higher adsorption capacity. Keen features are measured that permits these polymers to be utilized in numerous applications. It has been developed as a modern technique with the probability for an extensive range of uses in selective adsorption, biomedical fields, food processing, environmental applications, in utilizing the plant's extracts for further applications, and sensors. This review covers the approaches of developing the CSMIPs synthetic schemes, and their application with special emphasis on uses in the biomedical field, food care subjects, plant extracts analysis and in environmental studies.

Study on Adsorption of Crosslinked Starch Microspheres towards Heavy Metal Ions

2013 ◽  
Vol 834-836 ◽  
pp. 531-535
Author(s):  
Li Yan Yang ◽  
Yi Hui Guo ◽  
Li Li Yu ◽  
Jing You
Keyword(s):  
Metal Ions ◽  
Reversed Phase ◽  
Adsorption Rate ◽  
X Ray Diffraction ◽  
Adsorption Selectivity ◽  
X Ray ◽  
Starch Microsphere ◽  
Other Substances ◽  
Effects Of Media ◽  
Kinetics Of

A type of cross-linking starch microsphere (CSMs) has been synthesized via reversed phase suspension method. Crosslinked starch microsphere has good adsorption performance to metal ions in water. The adsorption kinetics of Co (II) on the CSMs, selectivity of adsorption CSMs towards Co (II),Cu (II),Pb (II),Cd (II) and adsorption effects of media towards Co (II) were investigated. The CSMs and its adsorption product were comparatively characterized by X-ray diffraction (XRD). The results showed that The adsorption rate is mainly controlled by liquid film diffusion, and the constant of adsorption rate is 0.0686min-1 at 308K. The crystal structure of the CSMs decreased greatly after the incorporation of Co (II). Co (II) has better adsorption selectivity on CSMs. Ions coexist and other substances in the solution have certain impact on adsorption. Those data are helpful for treatment of the wastewater containing heavy ions.

scholarly journals Optimization of Mordenite Membranes Using Sucrose Precursor for Pervaporation of Water-Ethanol Mixtures

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 160
Author(s):  
Abdulaziz A. Alomair ◽  
Yousef Alqaheem
Keyword(s):  
Pyrolysis Temperature ◽  
Operating Temperature ◽  
Selective Adsorption ◽  
Sucrose Concentration ◽  
Low Cost ◽  
Water Flux ◽  
Separation Performance ◽  
Carbon Membranes ◽  
Adsorption Of Water ◽  
High Separation

Post-treated mordenite membranes were prepared using sucrose (C12H22O11) as a carbon precursor to block any pinholes and defects in the zeolite layer. The pervaporation (PV) process was used to separate ethanol from the water. The effects of the sucrose concentration and the pyrolysis temperature (650–850 °C) were investigated, and the resulting high separation performance compared to those post/pre-treated membranes was reported in the literature. In this study, mordenite carbon membranes yielded a water/ethanol separation factor of 990.37 at a water flux of 9.10 g/m2h. The influence of the operating temperature on the performance of the membrane also was considered. It was concluded that the selective adsorption of water through zeolite pores was achieved. The entire preparation procedure was achieved using a rapid, low-cost preparation process.

scholarly journals Husk of Agarwood Fruit-Based Hydrogel Beads for Adsorption of Cationic and Anionic Dyes in Aqueous Solutions

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1437
Author(s):  
Chih Ming Ma ◽  
Bo-Yuan Yang ◽  
Gui-Bing Hong
Keyword(s):  
Aqueous Solutions ◽  
Selective Adsorption ◽  
Order Model ◽  
Anionic Dyes ◽  
Adsorption Selectivity ◽  
Hydrogel Beads ◽  
Batch System ◽  
Initial Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Hydrogel beads based on the husk of agarwood fruit (HAF)/sodium alginate (SA), and based on the HAF/chitosan (CS) were developed for the removal of the dyes, crystal violet (CV) and reactive blue 4 (RB4), in aqueous solutions, respectively. The effects of the initial pH (2–10) of the dye solution, the adsorbent dosage (0.5–3.5 g/L), and contact time (0–540 min) were investigated in a batch system. The dynamic adsorption behavior of CV and RB4 can be represented well by the pseudo-second-order model and pseudo-first-order model, respectively. In addition, the adsorption isotherm data can be explained by the Langmuir isotherm model. Both hydrogel beads have acceptable adsorption selectivity and reusability for the study of selective adsorption and regeneration. Based on the effectiveness, selectivity, and reusability of these hydrogel beads, they can be treated as potential adsorbents for the removal of dyes in aqueous solutions.

Directly decorated CeY zeolite for O2-selective adsorption in O2/N2 separation at ambient temperature

2021 ◽  
Author(s):  
Hanbang Liu ◽  
Danhua Yuan ◽  
Liping Yang ◽  
Jiacheng Xing ◽  
Shu Zeng ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Selective Adsorption ◽  
Air Separation ◽  
Adsorption Selectivity ◽  
First Time

The traditional zeolites used in air separation are generally N2-selective adsorbents. It was found for the first time that the O2/N2 adsorption selectivity can be reversed by directly decorating the...

scholarly journals Analysis of Cuticular Lipids of the Pharaoh Ant (Monomorium pharaonis) and Their Selective Adsorption on Insecticidal Zeolite Powders

2018 ◽  
Vol 19 (9) ◽  
pp. 2797 ◽  
Author(s):  
Heleen Van Den Noortgate ◽  
Bert Lagrain ◽  
Tom Wenseleers ◽  
Johan Martens
Keyword(s):  
Chemical Composition ◽  
Insecticidal Activity ◽  
Selective Adsorption ◽  
Epicuticular Wax ◽  
Gas Chromatography Mass Spectrometry ◽  
Adsorption Selectivity ◽  
Adsorption Mechanisms ◽  
Pore Mouth ◽  
Adsorption Processes ◽  
Epicuticular Wax Layer

The pharaoh ant is a notorious and hard to eradicate pest, which poses a threat in hospitals, spreading pathogens and contaminating sterile equipment. When applied on ants, zeolites adsorb part of their epicuticular wax layer. The ants are then vulnerable to desiccation, since this layer regulates water exchange. We analyzed the chemical composition of this wax layer using GC-MS (Gas Chromatography-Mass Spectrometry). A hexane wash of M. pharaonis foragers resulted in the identification of 53 components, four of which were not previously defined in Monomorium species. Selective adsorption of specific compounds on zeolites assisted in the identification of compounds which could not be separated on the GC column and allowed for the identification of three additional compounds. Zeolites show different affinities for the wax compounds depending on pore structure and chemical composition. Selective adsorption of alkanes on zeolites is also investigated in the fields of refinery processes and catalysis. Pore mouth and key lock adsorption mechanisms and selectivity according to molecular weight and branching, investigated in these fields, are also involved in adsorption processes of epicuticular waxes. The insecticidal activity of a zeolite is related to adsorption selectivity rather than capacity. One of the best adsorbing zeolites showed limited insecticidal activity and can be considered as a non-lethal alternative for epicuticular wax sampling.

THE SORPTION OF SOAP BY TEXTILE FIBERS

1950 ◽  
Vol 28f (3) ◽  
pp. 51-61 ◽  
Author(s):  
A. S. Weatherburn ◽  
G. R. F. Rose ◽  
C. H. Bayley
Keyword(s):  
Molecular Weight ◽  
Fatty Acid ◽  
Aqueous Solutions ◽  
Sodium Oleate ◽  
Viscose Rayon ◽  
Free Alkali ◽  
Textile Fibers ◽  
Complex Process ◽  
Maximum Sorption ◽  
Preferential Sorption

The sorption of the sodium soaps of lauric, myristic, palmitic, stearic, and oleic acids from aqueous solutions by various textile fibers has been measured. The sorption of both the fatty acid and alkali components of the soaps by dull acetate rayon and dull nylon fibers was essentially the same as that shown by the corresponding bright (undelustered) fibers, while dull viscose rayon sorbed considerably more fatty acid than the bright fiber. In general, the order of increasing sorption was: cotton, nylon, acetate, bright viscose, dull viscose, and wool. Of the saturated soaps, the maximum sorption of fatty acid by all fibers was obtained with sodium myristate, while the alkali sorptions were approximately the same for myristate, palmitate, and stearate, all of which were higher than for laurate. The sorption from sodium oleate solutions corresponded approximately to that from the C14–C16 saturated soaps. Preferential sorption of alkali by cotton and viscose rayon was observed for all soaps, while acetate rayon, nylon, and wool showed preferential sorption of fatty acid with the lower molecular weight soaps and preferential sorption of alkali with the higher soaps. Suppression of hydrolysis by the addition of excess free alkali resulted in a reduction in fatty acid sorption in every case, and shifted the maximum from the C14 to the C16 soap. It is concluded that the sorption of soap by textile fibers is a complex process involving the more or less independent sorption of neutral soap, hydrolytic fatty acid (or acid soap), and hydrolytic alkali.

Impact of intrinsic framework flexibility for selective adsorption of sarin in non-aqueous solvents using metal–organic frameworks

2020 ◽  
Vol 22 (11) ◽  
pp. 6441-6448 ◽  
Author(s):  
Jongwoo Park ◽  
Mayank Agrawal ◽  
Dorina F. Sava Gallis ◽  
Jacob A. Harvey ◽  
Jeffery A. Greathouse ◽  
...  
Keyword(s):  
Selective Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Selectivity ◽  
Complex Molecules ◽  
Metal Organic

We assess the nontrivial deviation in predicting the adsorption selectivity from bulk mixtures of complex molecules using nanoporous adsorbents approximated as rigid and intrinsically flexible.

Floating Separation between Collophanite and Dolomite Affected by Inorganic Interaction

2014 ◽  
Vol 881-883 ◽  
pp. 1665-1669
Author(s):  
Xiao Tai He ◽  
Qin Zhang ◽  
Shu Hao Qin
Keyword(s):  
Aqueous Solution ◽  
Surface Properties ◽  
Theoretical Basis ◽  
Selective Adsorption ◽  
Electric Properties ◽  
Mineral Surface ◽  
Negative Effects ◽  
Adsorption Characteristics ◽  
Research Findings ◽  
Dissolved Components

According to the type of Guizhou marine sedimentary phosphorus ore, the main reason of refractory is the similar surface properties of collophane and dolomite.In addition,the interaction of dissolved components of mineral and external ion leads the new eguilibrium system in aqueous solution,which further affects the selective adsorption of the agent in mineral surface.Selecting collophanite-dolomite system as the research object, this article studies the effect of the interaction of some inorganic anions on the floatability difference of the two minerals in the flotation system. The effect of the interaction on the electric properties of the mineral surface and adsorption characteristics were also examined with the purpose to find out the interaction mechanism.It hopes to provide theoretical basis for practical mineral selection. The research findings shows that in the range of pH 3 to 5, the interaction of PO43- and SO42- has a better effect of the separation between collophanite and dolomite.The interactions of SiO32- and CO32- makes the floatability difference of collophanite and dolomite closer when the pH is greater than 9.25, and simultaneously shows some negative effects on the flotation separation of the two minerals.

Effects of Non-Ionic Surfactant on the Deep Temperature Flotation Agents of Hematite

2012 ◽  
Vol 538-541 ◽  
pp. 2354-2357 ◽  
Author(s):  
Xiao Jun Jiang ◽  
Yun Jin Wang ◽  
Hong Bo Xu ◽  
Jian Wang
Keyword(s):  
Surface Tension ◽  
Fatty Acid ◽  
Polyethylene Glycol ◽  
Sodium Oleate ◽  
Ionic Surfactant ◽  
Low Carbon ◽  
Optimal Composition ◽  
Different Temperatures ◽  
Deep Temperature ◽  
Tension Methods

This investigation involves the effects of non-ionic surfactant materials on the industrial sodium oleate, sodium naphthenate and their mixtures at different temperatures by the surface tension methods. The effects on the critical micelle concentration (CMC) of sodium oleate were assessed by the Toween 80(T-80) presence, polyethylene glycol, polyether and other non-ionic surfactant. T-80 was proved more effective than other non-surfactant in increasing the sodium oleate CMC at same concentration. Using the optimal composition of sodium fatty acid and the surfactant can reduce the temperature of separation hematite from 43°C to 23°C, achieve the purpose of low carbon and energy saving.

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