Adsorption cellulose beads

Luo XG, Zhang LN (2009) High effective adsorption of organic dyes on magnetic cellulose beads entrapping activated carbon. J Hazard Mater 171 340-347... 

In this study the AFM colloidal probe technique was used to investigate the forces between cellulose beads in aqueous solutions of simple electrolyte and xylan. Particular attention was paid to the behaviour of the cellulose beads. The adsorption kinetics and characteristics of adsorbed xylan on cellulose was studied with a quartz crystal microbalance with dissipation (QCM-D). 

In bulk experiments the interaction between cellulose and hemicellulose is often described as sorption rather than adsorption, implying that xylan may also be embedded into the fibre interior. There is no indication of sorption of xylan into the cellulose beads in our experiments. Such sorption would certainly imply changes in the elective radii of the bead with xylan concentration. It has b n shown in the studies of sorption of xylan on birch kraft pulp that the xylan content on the fibre surfaces is much larger than in the bulk fibres (33). We therefore believe that our experiments are of direct relevance to the adsorption behaviour of xylan in chemical pulps. For mechanical pulps, with large amounts of lignin and extractive material in the surface, the situation will be different. 

Adsorption of reactive dye K-2BP by immobilized Aspergillus fumigatus in Na-carboxymethyl-cellulose (Na-CMC), Na-ALG, PVA, and CTS was studied by Wang et al. [61]. The dye culture mediums were almost completely decolorized 48 h using CTS and Na-CMC immobilized beads. The adsorption efficiency of SA and PVA-SA immobilized beads exceeded 92 and 79.8% in 48 h, respectively. 

Invertase Biospecific adsorption adsorption on Con A-bead cellulose... 

In principle, liquid partition chromatography (LPC) is a liquid-liquid extraction where one of the liquid phases is stationary and attached to a supporting material, and the other liquid phase is mobile. It can be carried out with either the aqueous or die organic phase stationary in the latter case the technique is referred to as reversed phase LPC. The aqueous phase can be made stationary by adsorption on silica gel, cellulose powder, etc. In order to make the organic phase stationary, beads (usually 50 - 200 pta) of PVC, teflon, Kel-F, etc., are being used. 

Li, N. and Bai, R. 2005. Copper adsorption on chitosan-cellulose hydrogel beads Behaviors and mechanisms. Sep. Purif. Technol. 42, 237-247. 

Zhou D, Zhang LN, Zhou JP, Guo SL (2004) Cellulose/chitin beads for adsorption of heavy metals in aqueous solution. Water Res 38 2643-2650... 

F re4.7 Electron micrograph of silica-polystyrene composite particles showing large silica particles surrounded by small heterocoagu-lated polystyrene particles. The silica beads have been made hydrophobic through the adsorption of hydroxypropyl cellulose. Reprinted from [56] 1986, with permission from Else-... 

AN, 0-Carboxy methyl chitosan/cellulose acetate blend nano filtration membrane was prepared in acetone solvent. It had been tested to separate chromium and copper fiom effluent treatment. The highest rejection was observed to be 83.40% and 72.60%, respectively (Alka et al., 2010). A chitosan/cellulose acetate/polyethylene glycol ultra filtration membrane was prepared with DMF as solvent. It was focused to be efficient in removing chromium from artificial and tannery effluent wastewater. The highest rejection rate was responding (Sudha et al., 2008).Cross-linked chitosan/polyvinyl alcohol blend beads were prepared and studied for the adsorption capacity of Cd from wastewater. The maximum adsorption of Cd(II) ions was foimd to be 73.75% at pH 6 (Kumar et al., 2009). 

Bead cellulose is a macroporous highly hydrophilic rigid material in a regular spherical form (Stamberg et al., 1982 Stamberg and Peska, 1983). It has excellent flow properties and a very low nonspecific adsorption. 

Dewangan, T., Tiwari, A., and Bajpai, A. K. 2010. Adsorption of Hg(II) Ions onto binary bio-polymeric beads of carboxymethyl cellulose and alginate. J. Dispersion Sci. Technol. 31 844-851. 

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