Photocatalytic degradation of organic dyes is considered as an ideal strategy to solve the dye pollution problem. In this study

melamine

graphene oxide (GO)

and hollow ZnFe

2

O

4

were used as precursors to construct a 3D ZnFe

2

O

4

/g-C

3

N

4

/rGO skeleton by heat treatment. Then

the silver (Ag) as a co-catalyst was immobilized on the ZnFe

2

O

4

/g-C

3

N

4

/rGO skeleton to prepare the 3D ZnFe

2

O

4

/g-C

3

N

4

/rGO@Ag composite photocatalyst. The structure

morphology

and chemical composition of the obtained materials were characterized with Fourier transform infrared (FT-IR)

X-ray diffraction patterns (XRD)and scanning electron microscopy (SEM). The experimental results showed that the degradation activity of ZnFe

2

O

4

/g-C

3

N

4

/rGO@Ag composite catalyst for Rhodamine B (RhB) was significantly enhanced

and the degradation rate of RhB reached 97% within 20 min under visible light irradiation

which was twice as high as that of ZnFe

2

O

4

/g-C

3

N

4

/rGO. In addition

the introduction of ZnFe

2

O

4

endowed the ZnFe

2

O

4

@g-C

3

N

4

/GO@Ag composite with good magnetic properties

which can be easily separated from the reaction system under the action of an external magnetic field. After repeated use for 5 times

the photocatalytic activity did not decrease significantly

indicating that the catalytic material has excellent stability and recyclability.