Adsorption Properties of Ionic Species on Cross-linked Chitosans Modified with Catechol and Salicylic Acid Moieties

Abstract

Catechol-type chitosan resin and salicylic acid-type chitosan resin were easily synthesized for use in estimating the adsorption behavior of 34 elements at pH 1 -7 in aquatic media. The catechol-type chitosan resin could adsorb Cu(II) at pH 3 -7, In(III) at pH 4 -6, Pb(II) and lanthanoids at pH 5 -7, and U(VI) at pH 4 -7 more effectively than the salicylic acid-type chitosan resin and the cross-linked chitosan resin (base material). Adsorption ability was in the order: catecholtype chitosan resin > salicylic acid-type chitosan resin > cross-linked chitosan resin.

Mussel-Inspired Carboxymethyl Chitosan Hydrogel Coating of Titanium Alloy with Antibacterial and Bioactive Properties

“…Dopamine (DA), a mussel-inspired polymer with abundant catechol, can form a polydopamine film on different ranges of both inorganic and organic surfaces by spontaneous oxidative polymerization [21,22]. Besides, over the past decade, a variety of catechol-rich chemicals have been connected to the chitosan backbone [23], such as 3,4-dihydroxyhydrocinnamic acid [6,24,25], 3,4dihydroxybenzealdehyde [26,27], ferulic acid [28][29][30], etc. Gallic acid (GA) is currently the most used phenolic acid to be grafted onto chitosan, owing to its antioxidant properties and low cost [31].…”