Bio-based chitosan and cellulose ionic liquid gels: polymeric soft materials for the desulfurization of fuel

Abstract

Desulfurization of fuel, that avoids the introduction in the atmosphere of toxic sulfur volatile compounds, usually formed during combustion, is a viable strategy to reduce pollution. To find new efficient...

UV-Cured Chitosan and Gelatin Hydrogels for the Removal of As(V) and Pb(II) from Water

“…The polymeric chains of chitosan are composed of a random mixture of β-(1→4)- d -glucosamine and N -acetyl- d -glucosamine units possessing many reactive groups such as amino and hydroxyl ones that can be easily modified [ 22 ]. Therefore, in recent years chitosan-based gels and membranes have attracted widespread research interest [ 23 , 24 , 25 ]. Another interesting natural polymer is gelatin which is an animal protein consisting of linear ionic polymeric chains bearing different amino and carboxylic functional groups.…”

How Ionic Liquid Gels Work on the Removal of Bisphenol A from Wastewater

“…The porosity and swelling of all ILGs were determined according to reported procedures ,, using hexane as the solvent. Hexane was cast on gels for 24 h. By knowing the initial weight of the empty vial ( W 1 ), the weight of the vial and the gel before ( W dry ) and after ( W 2 ) adding hexane and the final weight of the vial and gel after removing hexane ( W 3 = W wet ), it was possible to determine the porosity ( P ) and swelling ( Q ) using the following equations V normalg = 4 .25em − .25em ( W 2 − W 1 − W d r y ρ h ) V normalp = W 2 .25em − .25em W 3 .25em − .25em W normald normalr normaly ρ normalh P = V normalP V normalp + V normalg × 100 Q = W normalw normale normalt − W normald normalr normaly ...…”

“…We previously observed such competitive action in regenerat-ing biobased polymer gels used to remove sulfur compounds from fuels. 28 After examining the performance of our gels under static adsorption conditions, we moved to investigate their ability to remove BPA from flowing aqueous phases. To this aim, we used the gels as loading for syringes, a BPA aqueous solution (4 × 10 −4 M) was allowed to flow through the gel, and the ensuing solution was treated sequentially in the same way two other times.…”

Holding it together: noncovalent cross-linking strategies for ionogels and eutectogels

“…84 In this case, both hydrogen bonding and solvophobic interactions between methylcellulose chains played a role in forming a robust noncovalent scaffold. The group of D’Anna has also demonstrated biopolymer-supported ionogels, 85 as well as ionogels formed using LMWGs of ammonium/phosphonium 86 or imidazolium salts, 87 within all of which hydrogen bonding was shown to be a key noncovalent interaction.…”