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Adsorption and Ion-Exchange Processes
Published in Thomas E. Carleson, Nathan A. Chipman, Chien M. Wai, Separation Techniques in Nuclear Waste Management, 2017
The area of extraction chromatography, although not as popular as ion-exchange chromatography, has been used at various times by a variety of researchers. There are examples of its use sprinkled throughout the literature. Extraction chromatography appears to have become much more popular in the last decade, perhaps due to the lack of commercial chelating resins available for removal of specific metal ions. These extraction chromatographic materials are sometimes called solvent-impregnated resins. The work in this field was reviewed in 1973.49 The concept or need for ion-specific resins has not led to the development of ion-exchange resins that are specific for only one or two particular species. In fact, this may be almost impossible due to the similar chemistry exhibited by the various metal ions within a periodic family. The rationale behind the solvent-impregnated resins is that a specific extractant can be loaded onto a substrate; either a polymeric resin, or silica gel, or some other inert substrate. This solvent-impregnated resin now can be used to extract the specific metal ions without extracting many of the other ions that may be present in solution. There are many examples of their use in the literature over the past two decades.50–61
Ultrasound-assisted Aliquat 336 functionalized natural resin for improved removal of Bisphenol-A and Biochanin-A from aqueous solution
Published in Chemical Engineering Communications, 2023
Sakshi Batra, Govind Singh Selakoti, Anusha Jain, Shubham Malhotra, Akshita Lodha, Niksha Lamba, Dipaloy Datta
Recently, the use of solvent impregnated resin for the treatment of pollutants from wastewater is gaining attention. The technique combines the principles of ion exchange, solvent extraction, and adsorption. The main advantage of this method is the minimum loss of the solvent (Marinsky and Marcus 1997). The solvent molecules attach inside the resin pores making the resin hydrophobic (Burghoff et al. 2008). Also, the problem of emulsification and phase separation can be reduced. The solute molecules could easily interact with the solvent and surface of the resin with better selectivity (Aguilar and Cortina 2008). Almond gum or natural almond resin (NAR) is extracted from the bark of the almond tree (Prunus Dulcis) and contains L-arabinose, L-galactose, aldobionic acid, and D-mannose which are used as an emulsifier, suspending agent, stabilizing agent, thickener, viscosity enhancer and sweetener (Asai et al. 2005; Hassan et al. 2017). Generally, commercially available resins are comparatively expensive, and use on a large scale becomes uneconomical. Therefore, naturally available resins could be an alternative to the commercial ones. The focus of the present study was to modify and enhance the characteristics of natural almond resin (NAR) by impregnating Aliquat-336 (A336) molecules into the pores of the resin. The modified resin was used for the removal of endocrine-disrupting compounds (Bisphenol-A and Biochanin-A) from their aqueous solutions.
Phytic acid modified N1923 solvent impregnated resins for adsorption of in(III)
Published in Journal of Dispersion Science and Technology, 2022
Xuezhen Gao, Yuanyuan Wan, Junshen Liu, Xunyong Liu, Lei Guo, Shengxiao Zhang
Solvent impregnated resins (SIRs) as a kind of adsorption resins combine the advantages of resins and extractants, which load the extractant in the porous network of the resin through physical adsorption.[19] So, SIRs can be as alternative adsorbents used to extract indium. In recent years, there have been some reports on SIRs extraction of indium.[10,20–22] Although there are several articles about SIRs absorption of indium, most of which are prepared by choosing conventional extractants. However, the SIRs with a novel extractant or modified extractant used in indium adsorption have rarely been reported.
Synthesis of Adsorbents with Anion Exchange and Chelating Properties for Separation and Recovery of Precious Metals – A Review
Published in Solvent Extraction and Ion Exchange, 2020
Solvent-impregnated resins (SIRs) have attracted much attention in recent years due to their ability to selectively extract different metals. These materials feature synthetic routes much less complicated than in the case of many ion exchange and chelating resins. Basically, the synthesis of SIRs allows the utilization of liquid-liquid extractants in the manner of solid-liquid ones. Such an approach allows combining the advantages of a target-selective extractant or ionic liquid with the ease-of-use of a chelating resin.[78,79]