Body temperature-responsive gels derived from hydroxypropylcellulose bearing lignin II: adsorption and release behavior

Abstract

The lower critical solution temperature (LCST) of hydroxypropylcellulose bearing lignin (HPC-L) prepared from unbleached pulp depends on the amount of residual lignin. An HPC-L gel having thermal properties reflective of original HPC-L was prepared using ethyleneglycol diglycidylether as a crosslinker, as previously reported [Uraki et al. (2004) Carbohydr. Polym. 58:123 -130], and the volume transition temperature was detected as an endothermic peak by differential scanning calorimetry (DSC). The adsorption and release behavior of the guest molecules to/from this gel was then examined. When the adsorption of cationic and anionic guests was compared, cationic methylene blue (MB) was adsorbed in larger amounts than anionic methyl orange (MO). In addition, MB adsorption into the HPC-L gel was greater than MB adsorption into the HPC gel prepared from commercially available HPC. This suggests that residual lignin affects the adsorption of organic dyes. Significant differences were not observed with respect to the release of MB from HPC-L at 38°C and lower temperatures. In the adsorption of surfactants, marked adsorption at around the critical micelle concentration of the ionic surfactants and gel swelling were observed. Such swelling did not occur in the aqueous nonionic surfactant solution, although the nonionic surfactant was adsorbed into the gel. Gel swelling may have been caused by the electrostatic repulsion of the ionic surfactants adsorbed onto the polymer chains within the gel structure.

Hydrothermal route to twinned-hemisphere-like CuO architectures with selective adsorption performance

“…22,[33][34][35] Therefore, developing facile methods to eliminate and separate MB has become an imperative issue. In this paper, we find that the as-obtained twinned-hemisphere CuO showed very highly selective sorption of the cationic dye (MB) but they were found not to remove the anionic dye (MO) (MO is a typical anionic dye, which acts as a contrast dye in this experiment and is used to explore the preferential adsorption capability of our product 36,37 ).…”

Synthesis of cellulose derivative based superabsorbent hydrogels by radiation induced crosslinking

“…Recently, several cellulose derivative-based hydrogels were synthesized using various methods (Chang and Zhang 2011;Saglam et al 2002;Yang et al 2011). While carboxymethyl cellulose is in the center of such research, various alkyl (Haque and Morris, 1993) and hydroxyalkyl (Rosén et al 1998;Das et al 2012;Uraki et al 2006) derivatives may also be used for the purposes mentioned before. Both physical (Li et al 2001;Saglam et al 2002) and chemical gels were successfully synthesized, the latter by using various crosslinking agents (Anbergen and Oppermann 1990;Seki et al 2014).…”

Elimination of Microcystis aeruginosa Kütz. by modified walnut and peanut shells with phosphoric acid

“…Liu et al (1994) and Jia (2012) determined the chemical composition of walnut and peanut shells and found the main components as cellulose and lignin (Table 4). The modified cellulose and lignin have been found effective as excellent metal and basic dye sorbents (Karsheva et al 2000, O'Connell et al 2008, Gurgel and Gil 2009, Zhang et al 2010, Uraki et al 2006, Gong et al 2008. Therefore, in the present investigation, the use of modified walnut and peanut shells as algaecides might be due to their high contents of cellulose and lignin.…”