The invention relates to a
cuttlefish melanin-based nano-silver
composite material and a preparation method and catalytic application thereof.The preparation method comprises the following steps that S1,
cuttlefish ink sacs are taken and
cut, ink is squeezed out, after deionized water is added for soaking treatment,
centrifugation,
solid-liquid separation and
vacuum drying are conducted,
cuttlefish melanin powder is obtained, then the cuttlefish
melanin powder is ultrasonically dispersed into a proper amount of deionized water, standing and precipitating are performed to remove large particles which cannot be ultrasonically dispersed, and upper-layer dispersion liquid is taken; and s2, PVP
powder, deionized water and the cuttlefish melanin dispersion liquid in the step S1 are put into a reaction container according to the proportion and subjected to
ultrasonic dispersion, then a newly-prepared silver-
ammonia solution is added,
nitrogen is introduced to remove air, under the protection of
nitrogen, the temperature is increased to 70 DEG C and maintained, stirring is conducted till the reaction is complete, and finally
centrifugation,
water washing and
vacuum drying are conducted to obtain the cuttlefish melanin
composite material. The cuttlefish melanin-based nano-silver
composite material has the beneficial effects that the cuttlefish melanin is used as a carrier of the silver nanoparticles for the first time, and the silver-loaded composite material with excellent catalytic performance is prepared; and the composite material is good in catalytic performance, and the silver nanoparticles are firmly combined on the surface of the carrier and are not easy to
agglomerate or fall off.