The invention discloses a Pd / Fe@Fe3O4 compound catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) culturing
enterococcus faecalis to a stable period, filtering, , washing and preparing into freeze-dried
powder; (2) adding the
enterococcus faecalis freeze-dried
powder into a
palladium pecursor solution, and carrying out culturing, so as to obtain bacterial suspension; (3) adding
sodium formate into the bacterial suspension, and carrying out constant-temperature culturing, ultrasonic crushing, wahsing and
drying, so as to obtain biologically recycled
palladium; and (4) ultrasonically dispersing biologically recycled
palladium, Fe3O4 and ferrite into water to obtain dispersion liquid, dropwise adding a
sodium borohydridesolution into the dispersion liquid for reaction, washing, and
drying, so as to obtain the Pd / Fe@Fe3O4 compound catalyst.
Palladium in the Pd / Fe@Fe3O4 compound catalyst is derived from biologically recycled palladium, the preparation method is simple, the use amount of palladium is reduced, and the prepared compound catalyst is uniform in particle size and is high in catalytic activity, low in
pollution and cost and easily available in the application in the
catalytic degradation of environmental organic pollutants.