In the present research work, a highly recyclable catalyst of Ag-based agarose (HRC-Ag/Agar) hydrogel was successfully fabricated through a simple and e cient in situ reduction method without the aid of additional surface active agent. The interaction between the rich -OH groups in agarose and the Ag nanoparticles can effectively control the growth and dispersion of Ag nanoparticles in the HRC-Ag/Agar hydrogel. Moreover, HRC-Ag/Agar hydrogel without freeze drying and calcination can be directly used as a highly active catalysts in reducing aromatic organic pollutants (4-NP, RhB and MB) by KBH 4 . HRC-Ag/Agar hydrogel also show great advantages in separation and reusability of catalysts due to Ag attach to the agarose toughly via the interaction between Ag NPs and -OH groups and the chemical reactant has no signi cant damage to the Ag NPs, which can maintain high catalytic e ciency with no signi cant loss during ten cycles testing. The advantages of simple synthetic procedure, no secondary pollution, strong stability and the product easily separated make the HRC-Ag/Agar hydrogel have great potential prospect for environmental applications. The successful synthesis of the material was con rmed through SEM, EDS, XRD, Raman and FTIR techniques.
Intermolecular hydrogen bonds are formed through the electrostatic attraction between the hydrogen nucleus on a strong polar bond and high electronegative atom with an unshared pair of electrons and a partial negative charge. It affects the physical and chemical properties of substances. Based on this, we presented a physical method to modulate intermolecular hydrogen bonds for not changing the physical–chemical properties of materials. The graphite and graphene are added into the glycerol, respectively, by being used as a viscosity reducer in this paper. The samples are characterized by Raman and 1H-nuclear magnetic resonance. Results show that intermolecular hydrogen bonds are adjusted by graphite or graphene. The rheology of glycerol is reduced to varying degrees. Transmission electron microscopes and computer simulation show that the spatial limiting action of graphite or graphene is the main cause of breaking the intermolecular hydrogen bond network structure. We hope this work reveals the potential interplay between nanomaterials and hydroxyl liquids, which will contribute to the field of solid–liquid coupling lubrication.
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