Three-in-one multifunctional luminescent metal-organic gels/sodium alginate beads for high-performance adsorption and detection of chlortetracycline hydrochloride, and high-security anti-counterfeiting

Lanthanide-Functionalized Carbon Quantum Dot-Based Dual-Emission Hydrogels for Multilevel Anti-counterfeiting and Repeatable Information Loading

“…30 Moreover, Alg hydrogel with affluent carboxyl and hydroxyl groups can establish a robust hydrogel network via simple cationic crosslinking, which has found broad applications in anti-counterfeiting, fluorescence sensing, and various other fields. 9,31,32 Due to the presence of numerous deprotonated carboxyl and hydroxyl groups within the poly(vinyl alcohol)-sodium alginate (PVA-Alg) hydrogel network, CDs, serving as filler components and possessing numerous hydrogen donor and acceptor sites on their surface, readily interact with the PVA-Alg hydrogel network through hydrogen bonding, resulting in the formation of a CDs@PVA-Alg hydrogel. 33,34 Furthermore, Ln 3+ ions not only can serve as the metal cross-linking agents, enhancing the mechanical properties of the hydrogel network via strongly chelating with carboxyl groups in Alg, but also introduce an additional luminescence center for the CDs@ PVA-Alg hydrogel.…”

“…Furthermore, the incorporated CDs improve the mechanical properties of hydrogels and impart additional functionality, such as multilevel anti-counterfeiting and repeatable information loading. , Among the synthetic polymers capable of forming hydrogels, PVA has garnered increasing attention due to its desirable physical properties, including excellent biocompatibility, biodegradability, and chemical resistance . Moreover, Alg hydrogel with affluent carboxyl and hydroxyl groups can establish a robust hydrogel network via simple cationic cross-linking, which has found broad applications in anti-counterfeiting, fluorescence sensing, and various other fields. ,, Due to the presence of numerous deprotonated carboxyl and hydroxyl groups within the poly­(vinyl alcohol)-sodium alginate (PVA-Alg) hydrogel network, CDs, serving as filler components and possessing numerous hydrogen donor and acceptor sites on their surface, readily interact with the PVA-Alg hydrogel network through hydrogen bonding, resulting in the formation of a CDs@PVA-Alg hydrogel. , Furthermore, Ln 3+ ions not only can serve as the metal cross-linking agents, enhancing the mechanical properties of the hydrogel network via strongly chelating with carboxyl groups in Alg, but also introduce an additional luminescence center for the CDs@PVA-Alg hydrogel . Lanthanide-functionalized CDs-based hydrogel anti-counterfeiting materials with dual-emitting properties have not been reported in prior studies.…”

Facile Preparation of Cellulose Beads with Tunable Graded Pores and High Mechanical Strength

“…Porous beads, possessing spherical particles, a uniform pore structure, a good functional surface, and a controllable size, can match different application scenarios in adsorption [ 1 ], separation [ 2 ], chromatography packing [ 3 ], catalyst support [ 4 ], drug delivery [ 5 ], drug release [ 6 ], etc. Normally, porous beads have been made from inorganic or organic compounds, such as silica [ 7 ], carbon [ 8 ], cellulose [ 9 ], chitosan [ 10 ], alginate [ 11 ], polyacrylonitrile [ 12 ], etc. In comparison with other materials, cellulose is more attractive as a green advanced material due to its abundant source, renewability, non-toxicity, environmental friendliness, easy modification, and low cost [ 13 , 14 ].…”

Progress in Research and Application of Metal–Organic Gels: A Review

“…Metal–organic gels show a semi-solid state because metal ions and ligands form a specific three-dimensional network structure in the process of interaction, which hinders the flow of solvents so that a large number of solvent molecules are wrapped in the internal structure of the system, thus transforming the initial liquid state into non-flowing and stable semi-solid-state substances. Ligand-based gels can confer other physicochemical properties of metal ions, such as magnetism, color, rheology, adsorption, emission, photophysical properties, catalytic activity, and oxidation-reduction behavior, and ligands can also provide corresponding functional groups [ 6 , 7 , 8 , 9 ]. Both metal–organic gels and metal–organic frameworks are materials composed of metal ions and organic ligands.…”