Sorbents
A sorbent is a material that absorbs or adsorps gases, liquids or other atoms and molecules. “Absorb” refers to incorporating the molecules within the structure of the sorbent; “adsorp” refers to attaching the molecules to the surface of the sorbent. (RDC 11/22/2010)
(Wikipedia, Sorbents, 11/22/2010)
Applications
Imprinting Sorbents
Chitosan Sorbents
Nanoparticle Sorbents
Superabsorbents
Tannin Sorbents
Recent US Patents
11/2/2010
7,825,169
Water-absorbent composition, process for production thereof, absorbent and absorbing product
Wada et al of Nippon Shokubai Co., Japan,has developed a water-absorbent composition including a specific plant extract; a water-absorbent resin whose surface portion and/or periphery thereof is treated; and/or a water-absorbent resin having a specific property. Specifically, it is preferable to use a water-absorbent resin having three characteristics: (1) a specific neutralization rate, (2) a specific particle diameter, and (3) a specific plant extract. The water-absorbent composition has a superior deodorant performance and an absorbent characteristic when the water-absorbent composition is used (provided) in an absorbing product such as a paper diaper, thereby providing a superior deodorant performance and a superior absorbent characteristic to the foregoing absorbing product. (RDC 3/2/2011)
9/28/2010
7,803,277
Process for removing fluorosurfactant from an aqueous fluoropolymer dispersion using sorbent pouches
Noelke et al of DuPont developed a process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a container with fluoropolymer dispersion, inserting into the container a fabric pouch containing a fluorosurfactant sorbent and, then, removing the fabric pouch. (RDC 12/7/2010)
Recent Journal Articles
12/3/2010
An investigation into transition metal ion binding properties of silk fibers and particles using radioisotopes
( 3630–3639)Journal of Applied Polymer Science 119 #6 (2010)
Rajkhowa et al found that in all cases the silk powders absorbed metal ions faster than their respective silk fibers. Intensive degumming of the fibers and powders significantly reduced the time to absorb respective metal ions and the time to reach equilibrium was reduced from hours to 5–15 min at pH 8. Once bound, 45–100% of the metal ions were released from the sorbents after exposure to pH 3 buffer for 30 min. They showed that The total amount of each metal ion absorbed and time taken to reach equilibrium occurred in the following order: Cu2+ > Cd2+ > Co2+. (RDC 12/9/2010)
Synthesis and Characterization of Iron(III)-Coordinated Amine-Modified Poly(glycidylmethacrylate)-Grafted Densified Cellulose and Its Applicability in Defluoridation from Industry Effluents
(12254–12262) Industrial & Engineering Chemistry Research 49 #23 (2010)
Anirudhan and Suchithra of the University of Kerala, India showed that the adsorbent exhibits very high adsorption potential (>99.9%) at an optimum equilibrium pH 7.0. The nonlinear form of a pseudo second-order kinetic model and Langmuir isotherm model adequately described the experimental kinetic and equilibrium data. Adsorbed fluoride ions were desorbed effectively by 0.1 M HCl. (RDC 12/8/2010)
Comparative boron removal performance of monodisperse-porous particles with molecular brushes via “click chemistry” and direct coupling
(102-106) Colloids and Surfaces A: Physicochemical and Engineering Aspects 372 #1-3 (2010)
Samatya et al developeda new sorbent based on micron-size, monodisperse-porous particles for boron removal by a hybrid process involving “adsorption” and “membrane separation”. The sorbent was synthesized by a multi-stage polymerization involving the production of monodisperse polymer particles and the generation of dextran based molecular brushes on the particles via “click chemistry” The azide groups were obtained on the particles by the reaction between NaN3 and the epoxypropyl functionality. An alkyne carrying ligand, propiolic acid was covalently linked to the dextran via activation with a water soluble carbodiimide. Monodisperse-porous particles with dextran based molecular brushes can be used for boron-removal from water. (RDC 12/6/2010
Review Articles
Water-soluble functional polymers in conjunction with membranes to remove pollutant ions from aqueous solutions (294-322) Progress in Polymer Science 36 #2 (2011)
Rivas et al of the University of Concepción, Chile reviews water-soluble polymers that contain one or more amine, amide, carboxylic acid, hydroxyl, phosphonic acid, quaternary ammonium salts, and sulfonic acid groups at the backbone or side chain and their ability to remove ion pollutants from aqueous solutions. In additional, this review differentiates between different experimental procedures, including the liquid-phase polymer based retention (LPR) technique that combines the use of water-soluble polymers and ultrafiltration membranes, as well as arsenic removal by combining LPR and electrocatalytical oxidation (EO) techniques. EO and LPR can also be coupled off-line to remove arsenic inorganic species from aqueous solutions. A variety of studies show that the functional groups on the polymer and the solution pH have a marked effect on ion removal. (RDC 2/9/2011)