Preparation And Application Of Magnetic Zeolite Catalyst

Modern industry produced a large amount of wastewater which contained non-decompose organics and heavy metal ions, traditional treatments were easy to bring some new ions, induce secondary pollution, and hard to separate it from water. Nano-TiO2 could be widely applied in photocatalysis degradation because of its advantages of large specific surface area, non-toxicity, low cost, and long service life. But nano-TiO2 in water and organic media was likely to reunite, and the effective action area of nano-TiO2 was decreased. Depositing TiO2 nanoparticles in the pores of porous material may be an effective solution, and this method becomes a hot spot of research around the world. Meanwhile, we deposited magnetic nanoparticles Fe3O4 in the porous material, and recovered the material easily in the magnetic field. In the paper, we prepared magnetic zeolite catalyst Fe3O4/TiO2/MCM-41, and then researched the applications in photodegradation phenol and absorption Cr (Ⅵ) from wastewater.We took nano-sized modified Fe3O4 particles as the cores, cetrltrimethylammionium bromide (CTAB) and tetraethyl orthosilicate (TEOS) were used as the template and silica source respectively, then molecular sieves MCM-41 layers were coated on their surface, TiO2 nanoparticles were deposited in the pores by sol-gel process, thus the magnetic Fe3O4/TiO2/MCM-41 nanocomposites were successfully prepared. The products were characterized by TEM、FT-IR、XRD, etc, most of the particles were spherical with the average diameter between 90-150nm and the specific surface area was about 645m2·g-1.The photodegradation phenol and absorption Cr (VI) from water with the magnetic nanocomposites were carried out, showing that the as-synthesized magnetic nanocomposites had high photocatalytic degradation (94.12%) for organic substances and absorption capabilities (95.05%) for heavy metal ions, and could be separated rapidly from water under magnetic field. So the prepared Fe3O4/TiO2/MCM-41 is a new functional material which can treat organic contamination as well as heavy metal ion from wastewater.