Herein a simple and novel approach has been developed for surface modification of delaminate MXene with nano-mixed silver oxide which combined with mussel-inspired chemistry. Surface modification with dopamine as a secondary reaction platform for loading nano-silver compounds for removal of iodine was achieved. The internal structure and morphology were characterized by SEM and TEM. The element content and distribution analysis of EDS and XPS proved that nano silver compounds were successfully supported and uniformly dispersed on the surface of MXene. Then the adsorption batch experiment was carried out, adsorption time, pH and other factors on the adsorption performance of the adsorbents were studied in details. By calculating the enthalpy change, Gibbs free energy and thermodynamic parameters, the adsorption reaction was found to be an exothermic process. The adsorption kinetics measured the maximum adsorption capacity of 80 mg/g and the removal efficiency is as high as 80% and the adsorption equilibrium time has also been improved. The adsorption kinetics were well fitted by pseudo first-order and second-order models. All the above results demonstrated that the composite from mussel-inspired chemistry has excellent adsorption properties towards iodine ions. This study not only deepens the research on the adsorption behavior of iodine adsorption, but also provides new research directions and experimental methods for pseudo-iodine adsorption.
Conductive polymer composite scaffold displayed great advantages in nerve repair due to it could highly simulate the electrical microenvironment of natural tissues. However, the poor interfacial adhesion and the discrete distribution of conductive fillers in polymer matrix weaken its conductivity. Herein, Polydopamine (PDA) was grown in situ on PLLA microspheres, and then loaded with MXene nanosheets. Subsequently, a conductive MXene/PDA/PLLA conduit was fabricated by laser additive manufacture. During this processing, a three-dimensional continuous conductive network was constructed on the conduit utilizing its shearing-free properties. Meanwhile, PDA could form covalent and hydrogen bonds with MXene and PLLA through catechol, amino and imino groups, enhancing their interfacial compatibility. Additionally, PDA could generate photothermal for antibacterial under near-infrared radiation. DFT calculations proved the existence of favorable interfacial interactions between PDA and MXene and PLLA. Results showed that MXene was uniformly wrapped around the PLLA, forming a three-dimensional continuous conductive network in the conduit. At 7.5 wt% MXene, the permeation threshold and conductivity reach 1.81 % and 4.8 S/m, respectively. The enhanced current promoted cell nerve differentiation, as evidenced by a 2.4-fold upregulation of Nestin and a 4.3-fold increase in Ca 2 + influx. Besides, the conduit could effectively kill S. aureus and E. coli due to its excellent photothermal effect.
危险品化学品经营许可证（带存储）