An effective uranium removal using diversified synthesized cross-linked chitosan bis-aldehyde Schiff base derivatives from aqueous solutions

Abstract

Three new cross-linked chitosan derivatives were yielded through intensification of chitosan with diverse types of bis-aldehydes. The prepared cross-linked chitosan was characterized by FTIR, 1H NMR, XRD, and TGA techniques. TGA indicated an improvement in thermal stability of the cross-linked chitosan compared with pure chitosan. Batch adsorption experiments showed that the three novel cross-linked chitosan bis-aldehyde derivatives possessed good adsorption capacity against U(VI) in the order of BFPA > BFB > BODB (adsorption capacity of the three adsorbents for U(VI) reaches 142, 124, and 114 mg/g respectively) and the adsorption isotherm and kinetic were well described by the Langmuir and the pseudo-second-order kinetic model, respectively. In addition, the prepared cross-linked chitosan bis-aldehyde derivatives were examined as U(VI) catcher from waste solutions. Graphical Abstract

In Situ Preparation of High-Performance Silicon-Based Integrated Electrodes Using Cross-Linked Cyclodextrins

“…The pyrolysis temperature of β-CD itself is 313 °C, and that of CA is 233 °C, whereas that of β-CD-CA/c-β-CD-CA is 249 °C, which is between them. Thus, it is clear that cross-linking changes the pyrolysis temperature of the material …”

“…Thus, it is clear that cross-linking changes the pyrolysis temperature of the material. 29 To detect the interaction between the binder and active particles by X-ray diffraction (XRD), the β-CD-CA or c-β-CD-CA was mixed with Si at 1:1, followed by vacuum drying at 120 °C. As shown in Figure 5, since commercial silicon is applied directly without any treatment, usually commercial silicon has a crystalline silicon core and an outside silicon oxide layer.…”

PEG-grafted arsenic trioxide-loaded mesoporous silica nanoparticles endowed with pH-triggered delivery for liver cancer therapy

“…22,39 The successful modification of NH 2 -MSN with mPEG-CHO was confirmed by the asymmetrical stretching vibration and asymmetrical scissoring vibration of -CH 2from PEG at 2915 cm −1 and 1465 cm −1 , respectively, which indicated that mPEG had been conjugated on the surface of NH 2 -MSN successfully. 40,41 Surface attachment with ATO brought about van der Waals force and hydrophobic interactions and enabled the association of hydrocarbon chains between the external NH 2 -MSN and PEG. A core-shell structure was formed between the amine groups of NH 2 -MSN and the aldehyde groups of mPEG-CHO, which further increased the diameter of PEG-MSN.…”

Adsorbents for the Uranium Capture from Seawater for a Clean Energy Source and Environmental Safety: A Review

“…The important proceedings in this study include the new improvement in the preparation of uranium adsorbents including nanostructured materials, which includes the research on porous organic polymers, ,, porous aromatic frameworks, ,− metal–organic frameworks, − covalent organic frameworks, nanofibers, − organic/inorganic nanocomposites, − and biomaterials including cellulose, − chitosan, etc. ,− …”