Nowadays, the following techniques are used :

  Hydrothermal, Adsorbtion , Hydrothermal, sol-gel methods.

 I think the sol-gel methods is very good.

The best techniques are sol-gel and hydrothermal.

  Nowadays, the following techniques are used :

  Hydrothermal, Adsorbtion , Hydrothermal, sol-gel methods.

 I think the sol-gel methods is very good.

See these paper

https://www.researchgate.net/publication/266374380_Magnetically_recyclable_Ni0.5Zn0.5Fe2O4Zn0.95Ni0.05O_nano-photocatalyst_Structural_optical_magnetic_and_photocatalytic_properties

https://www.researchgate.net/publication/236096647_Synthesis_and_characterization_of_structural_optical_thermal_and_dielectric_properties_of_polyanilineCoFe2O4_nanocomposites_with_special_reference_to_photocatalytic_activity

Article Magnetically recyclable Ni0.5Zn0.5Fe2O4/Zn0.95Ni0.05O nano-p...

Article Synthesis and characterization of structural, optical, therm...

please follow the links given below:

1. http://pubs.acs.org/doi/pdf/10.1021/ic700688f

2. http://jss.ecsdl.org/content/2/7/Q118.abstract

3Adv. Mater. 2009, 21, 2233–2239

4. http://pubs.acs.org/doi/abs/10.1021/cm900608d

Dear Jamal Alizadeh

Hi

There are so many preparation procedures for fabrication of heterogeneous photocatalysts. Based on my experience in this field, firstly it is simple to select the photocatalyst you want to prepare. Based on this selection, you can decide about the preparation method. Moreover, after selecting the photocatalyst, I can help you about the procedure. It is very important to say that in some cases, you have to prepare a photocatalyst by combination of some methods, instead of a method. For example, please refer to the published papers by my research group.   

Please find the second attached paper.

Please find the third attached paper.