Preparation of lactic acid modified cellulose nanoparticles by microwave heating for preconcentration of copper from blood and food samples

Diaminated Cellulose Beads as a Sustainable Support for Industrially Relevant Lipases

“…However, the absorption intensity between 1580 and 1690 cm –1 was still higher than the absorption of cellulose prior to the reductive amination reaction, confirming the successful reduction of the imine and, thus, the presence of diaminated moieties on the cellulose (Figure b). Cellulose functionalization was further confirmed by the increase of the alkane C–H stretching (2840–3000 cm –1 ) in the imine and 1,6 DAB samples (Figure a) . Differences in absorption in the region between 3000 and 3500 cm –1 can be attributed to the variation of intramolecular/intermolecular, and cellulose/water hydrogen bonding (O–H stretching) .…”

“…This could be explained by the formation of hydrated carbonyl species present in the unmodified cellulose, such as hemiacetal and hemialdol, which adsorb in the same region. , The Schiff base intermediate (imine) was characterized by the presence of a distinct increased absorption in the region between 1580 and 1690 cm –1 (Figure b). Infrared absorption in this region can be associated with the presence of imine/oxime (1640–1690 cm –1 , CN stretching) and amine (1650–1580 cm –1 , N–H bending) both confirming the grafting of cellulose with the diaminated compounds. , After the reduction step and washing, the Schiff base intermediate showed a significant reduction of CN stretching and N–H bending absorption. However, the absorption intensity between 1580 and 1690 cm –1 was still higher than the absorption of cellulose prior to the reductive amination reaction, confirming the successful reduction of the imine and, thus, the presence of diaminated moieties on the cellulose (Figure b).…”

“…Cellulose functionalization was further confirmed by the increase of the alkane C−H stretching (2840−3000 cm −1 ) in the imine and 1,6 DAB samples (Figure 5a). 34 Differences in absorption in the region between 3000 and 3500 cm −1 can be attributed to the variation of S1. intramolecular/intermolecular, and cellulose/water hydrogen bonding (O−H stretching).…”

Chemically modified rice husk as an effective adsorbent for removal of palladium ions

“…The sorbent dose is a major factor that impacts the adsorption process. The quantitative separation of metal ions can't successfully be done when the sorbent dose is low [ 30 ]. Oppositely, using large amount of sorbent delays desorption of the retained metal ions by a small volume of eluent, in addition to the possible agglomeration of sorbent particles and the consequent reduction in its adsorption capacity [ 31 ].…”

Isothermal and Kinetic Investigation of Exploring the Potential of Citric Acid-Treated Trapa natans and Citrullus lanatus Peels for Biosorptive Removal of Brilliant Green Dye from Water

“…It is a basic dye, and on dissolution in an aqueous solution, it provides cations (BGD + ). ese adsorbents were also treated with different chemicals separately, such as ethanol, methanol, isopropanol, 0.1 M HCl, and 0.1 M NaOH, and some chelating agents such as urea [30], thiourea [31], EDTA [32], tartaric acid [33,34], citric acid [35][36][37], lactic acid [38], and acetone [39]. Both adsorbents were chemically processed with organic solvents (ethanol, methanol, and isopropanol) for their modifications in glass beakers covered with aluminum sheets for a period of 3 to 4 hours.…”