Mahdieh Ghobadifard - Department of Chemistry, Faculty of Science, University of Kurdistan, Sanandaj, Iran
Sajjad Mohebbi - Department of Chemistry, Faculty of Science, University of Kurdistan, Sanandaj, Iran

Environmental pollution has become the main concern to humans [۱,۲]. From the point ofview of numerous and permanent solar energy, photocatalysis has attracted much attentionworldwide in environmental improvement and energy generation in the last years [۳-۵]. Herein,the synthesis of cobalt(II, III) oxide QDs-Ag۲MoO۴ heterojunction was reported by hydrothermalmethod and identified by different techniques such as FT-IR, XRD, FE-SEM, EDS, TEM, DRS,PL, and UV–Vis spectroscopy. The SEM images illustrate that silver molybdate particles andcobalt(II, III) oxide QDs-AMO have a morphology of ۳D-hexagons and nanosheets collected onthe surface of ۳D-hexagons with an average size of ۳۶ and ۲۸ nm, respectively. The cobalt(II, III)oxide QDs-silver molybdate photocatalyst was used toward the decolorization of MB with aconversion rate of ۹۱%, which is ۱۵ times faster than pure AMO. The higher photocatalyst activityof cobalt(II, III) oxide QDs-AMO should be attributed to its lower charge recombination ratecompared with pure silver molybdate. The stability of this photocatalyst was determined byreusing it for five times without a remarkable decline in its activity. In addition, a postulatedmechanism by the hydroxyl radical way was suggested.

Conversion of Dyes, Heterojunction Photocatalyst, Semiconductor Quantum Dots