Preparation and metal uptake studies of modified forms of chitin

Selective sorption of Fe(III) using modified forms of chitosan beads

“…The possible mechanism of iron removal by PCB, CCB, and GCB are given in Figure 6. The lone pair of electrons present in O and N of the respective hydroxyl and aminogroups in the chitosan chelates Fe(III) 17–19. PCB removes iron by ion exchange mechanism while CCB removes by means of ion‐exchange as well as chelation as it contains both exchangeable H + ions and metal chelating amino groups.…”

“…Chitosan is the second most abundant biopolymer in nature, obtained from the shells of shrimp, crabs, and lobsters, which are waste products of seafood processing industries 14–16. Chitosan,17 crosslinked chitosan beads,17 chitin,18 modified chitin,18 nanohydroxypatite,19 nanohydroxyapatite/chitosan composite,19 nanohydroxyapatite/chitin composite,19 Cicer arientinum husk,20 olive cake,21 natural silica sand,22 thioglycolic modified oil‐palm fiber,23 etc., were tried for iron removal. Raw CB are soluble in dilute mineral acids, except in sulfuric acid and hence necessary to reinforce chemical stability using crosslinking agents like glutaraldehyde.…”

Chemical modification of chitin with polypyrrole for the uptake of Pb(II) and Cd(II) ions

“…This behavior may be attributed to the number of factors such as ion charge, size and concentration of the metal ions [24]. stretching vibration of amide group I and amide group II of chitin [5,12,14]. While, the peaks seen at 1558.2, 1415.67, 1070.08 and 784.12 cm −1 are corresponded to stretching vibrations of C C, C N, C H and C H ring-wagging vibration of polypyrrole [12].…”

Poriferan Chitin as a Versatile Template for Extreme Biomimetics

“…A number of reviews have been published regarding chitin chemistry [69], solubility [70,71] and chitin applications in biotechnology [72], waste water treatment [73][74][75], enzyme immobilization [76] and in biomedicine [72,77,78]. We, therefore, decided to focus this review on the specific properties of chitin that render it suitable for use in the more modern field of biomimetics, with a particular emphasis on extreme biomimetics.…”