Bifunctional mesoporous g-C3N4/Fe3O4 composites were prepared
and used for the simultaneous
visible-light catalysis and adsorption of arsenic from aqueous solution.
The as-prepared composites were characterized by wide-angle X-ray
powder diffraction, transmission electron microscopy, high-resolution
transmission electron microscopy, X-ray photoelectron spectroscopy,
ultraviolet–visible diffuse reflectance spectroscopy, a vibrating
sample magnetometer, and Brunauer–Emmett–Teller surface
analysis. Experimental results showed that meso-g-C3N4/Fe3O4 composites could
oxidize As(III) to As(V), which was in turn effectively removed by
the composites. The photocatalytic activity was significantly enhanced
by the synergistic effect between g-C3N4 and
Fe3O4. In addition, a reasonable visible-light
catalytic oxidation mechanism of As(III) was investigated.
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