The effectiveness of photocatalytic and Fenton reactions
in the
synergistic treatment of water pollution problems has become indisputable.
In this paper, nitrogen-doped TiO2 was selected as the
catalyst for the photocatalytic reaction and manganese-substituted
phosphomolybdic acid was used as the Fenton reagent, the two of which
were combined together by acid impregnation to construct a binary
photocatalysis-Fenton composite catalyst. The degradation experiments
of the composite catalyst on RhB indicated that under UV–vis
irradiation, the composite catalyst could degrade RhB almost completely
within 8 min, and the degradation rate was 19.7 times higher than
that of N-TiO2, exhibiting a superior degradation ability.
Simultaneously, a series of characterization methods were employed
to analyze the structure, morphology, and optical properties of the
catalysts. The results demonstrated that the nitrogen doping not only
expanded the photo response range of TiO2 but reduced the
work function of TiO2, which facilitated the transfer of
electrons to the loaded Mn-HPMo side and further promoted the electron–hole
separation efficiency. In addition, the introduction of Mn-HPMo provided
three pathways for the activation of hydrogen peroxide, which enhanced
the degradation activity. This study provides novel insights into
the construction of binary and efficient catalysts with multiple hydroxyl
radical generation pathways.