Modification of cotton-cellulose by preirradiation grafting

Hydrolysis of bamboo fiber cellulose in formic acid

“…6). These two regions are -OH stretching of intramolecular hydrogen bonds and -OH bending of substances with hydroxyl absorbed by cellulose, respectively (Hinterstoisser et al, 2001;Ruan et al, 2004;Oh et al, 2005a;Taká cs et al, 2005). After the treatment for 1.5 h, the absorption specific to bands in the region of wave numbers between 3340 and 3375 cm 21 and between 1420 and 1730 cm 21 was more intensive than that of the control sample, especially at 1721 cm 21 .…”

A comparative study of natural, formaldehyde-treated and copolymer-grafted orange peel for Pb(II) adsorption under batch and continuous mode

“…In another study, polyacrylamide was grafted onto coconut coir pith for Cr(VI) sorption with a capacity of 127 mg g −1 at pH 3 [11]. Polyacrylamide has been grafted onto other biosorbents, like cotton [12], banana stalks [13], fungal biomass [14], and cellulose [15] with similar success. This grafting method improves the adsorption capacity and also prevents the organic leaching, but also increases the stability of the adsorbent material, which is an important aspect of commercial development of the biosorbent.…”

Preparation, characterization, and process performance of composite fibrous adsorbents as cation exchangers for high throughput and high capacity bioseparations

“…Therefore, it is desirable that the modification in base polymer is only skin deep and this is achieved through technique utilized in this work. The swelling of cellulose in water is limited as a consequence of the presence of crystalline regions which restrict the mobility of the polymer chains [20]. The degree of swelling was observed as 2.95 g/g (∼300%) in distilled water at 24 • C and having a substantially cross section; the fiber diameter increases upon swelling compared to the fiber in its completely dry state.…”

“…None of these methods, however, are appropriate to the production of potential chromatographic supports, since grafting is in-homogeneous and limited to substrate external surface, swelling properties are difficult to control, ligand immobilization is complicated due to steric hindrance and the mechanical and chemical stability are poor for the resultant composite. Moreover, there is a lack in internal hydrogel which reduces the swelling ability and concomitantly the specific adsorption properties [17][18][19][20][21][22][23][24]. In the recent years, only a few limited studies can be found on the activation of membrane fabrics by surface grafting as an alternative to cotton fabric for bioseparations with low throughput and low dynamic binding capacities which are equal to or lower than commercial bead packed columns [25][26][27][28].…”