APCATA 456-2013-144

Electrochemical strategy for grown ZnO nanoparticles deposited onto
HY zeolite with enhanced photodecolorization of methylene blue:
Effect of the formation of Si O Zn bonds

Nanoparticles of electrogenerated zinc-supported HY zeolite (EGZnO/HY) catalyst were prepared by a
simple electrochemical method. The interaction between zinc species and HY support during the electrolysis
was found to affect the EGZnO/HY structure. In addition to the formation of EGZnO nanoparticles
(<30 nm in size) that distributed on the surface of HY support, an isomorphous substitution of Al with
Zn also occurred in the aluminosilicate framework to result in a Si O Zn bonds. The photoactivity of
EGZnO/HY was tested on the decolorization of methylene blue (MB). An amount of 0.375 g L−1 of 1 wt%
EGZnO/HY was found to be the optimum dosage for 10 mg L−1 MB, which resulted in 80% of maximum
decolorization after 6 h of contact time at pH 3 under fluorescent light (420 nm). Increasing the EGZnO
loading led to additional formation of Si O Zn bonds and lessened the number of EGZnO nanoparticles,
which then reduced the photodecolorization percentage of MB.The photocatalytic reaction was follows
the first-order Langmuir–Hinshelwood model, and gives partially mineralization. The photocatalyst was
still stable after five cycling runs with no Zn leaching.