Controlled preparation and reactive silver-ion sorption of electrically conductive poly(N-butylaniline)-lignosulfonate composite nanospheres

摘要

Electroconductive poly(N-butylaniline)-lignosulfonate (PBA-LS) composite nanospheres were prepared in a facile way by in situ, unstirred polymerization of N-butylaniline with lignosulfonate (LS) as a dispersant and dopant. The LS content was used to optimize the size, structure, electroconductivity, solubility, and silver ion adsorptive capacity of the PBA-LS nanospheres. Uniform PBA-LS10 nanospheres with a minimal mean diameter of 375nm and high stability were obtained when the LS content was 10wt . The PBA-LS10 nanospheres possess an increased electroconductivity of 0.109S cm~(-1) compared with that of poly(N-butylaniline) (0.0751S cm~(-1)). Furthermore, the PBA-LS10 nanospheres have a maximal silver-ion sorption capacity of 815.0mg g-1 at an initial silver ion concentration of 50mmol L~(-1) (25 °C for 48h), an enhancement of 70.4 compared with PBA. Moreover, a sorption mechanism of silver ions on the PBA-LS10 nanospheres is proposed. TEM and wide-angle X-ray diffraction results showed that silver nanoparticles with a diameter size range of 6.8-55nm was achieved after sorption, indicating that the PBA-LS10 nanospheres had high reductibility for silver ions. Silver nanospheres: Lignosulfonate (LS) as a dispersant has been exploited to generate poly(N-butylaniline)-LS composite nanospheres with controllable size and silver-ion adsorptivity (see figure). The non-monotonic variation of the silver-ion adsorption capacity with LS content indicates the existence of a synergistic effect of the functional groups on the composite chains.