Cobalt ferrite CoFe 2 O 4 nanoparticles were prepared via a polyacrylamide gel route and were characterized by XRD, SEM, XPS and VSM. It is demonstrated that the sample (designated S1) prepared without using the cross-linking agent bis-acrylamide has an average grain size of 45 nm, while the sample (designated S2) prepared by introducing an amount of bis-acrylamide which is about 1/5 times the amount of acrylamide has an average grain size of 23 nm. The two kinds of particles are shaped like spheres. The cation distribution is determined, from Co 2p 3/2 and Fe 2p 3/2 XPS spectra, to be (Co 0.4 Fe 0.6 )[Co 0.6 Fe 1.4 ]O 4 for both the samples, where (Co 0.4 Fe 0.6 ) and [Co 0.6 Fe 1.4 ] represent cations in the tetrahedral and octahedral sites, respectively. Magnetic measurement reveals a saturation magnetization of 67.3 A·m 2 ·kg ¹1 for sample S1 and 62.3 A·m 2 ·kg ¹1 for sample S2, but a similar coercivity of about 87.5 kA·m ¹1 for both the samples. [

Herein a new type of 2D/0D/2D face-to-face contact g-C 3 N 4 @Au@Bi 4 Ti 3 O 12 heterojunction photocatalysts have been developed. The ternary composite photocatalysts are constructed by coupling Bi 4 Ti 3 O 12 nanosheets with g-C 3 N 4 nanosheets face-to-face and sandwiching Au nanoparticles between Bi 4 Ti 3 O 12 and g-C 3 N 4 nanosheets. The as-prepared g-C 3 N 4 @Au@Bi 4 Ti 3 O 12 composite photocatalysts were systematically investigated by various characterization techniques including XRD, UV-vis DRS, FTIR, SEM, TEM and XPS. The degradation experiments were carried out by removing rhodamine B (RhB) from water under simulated sunlight. It is found that the g-C 3 N 4 @Au@Bi 4 Ti 3 O 12 composite photocatalysts exhibit much enhanced photodegradation performance when compared with bare Bi 4 Ti 3 O 12 and g-C 3 N 4 nanosheets, and moreover they exhibit excellent photocatalytic stability in recycling dye degradation. The underlying photodegradation mechanism of the g-C 3 N 4 @Au@Bi 4 Ti 3 O 12 composite photocatalysts was systematically investigated and discussed.

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