Abstract
Novel visible-light-responsive diatomite/g-C3N4 composite was successfully synthesized via a facile im- pregnation-calcination method. The sample was characterized by TG, XRD, FE-SEM, HR-TEM, FT-IR, XPS, UV-Vis-DRS, and PL spectra. The photocatalytic activities of samples were evaluated by degradation of RhB under visible light irradiation. Experimental results indicated that 2.32wt% diatomite/g-C3N4 composite exhibits high effi- ciency for the degradation of RhB. The photoreaction kinetics constant value is about 1.9 times as high as that of g-C3N4 under visible light irradiation. The radical trap experiments indicate that ·O2 - serves as the main active species for the photodegradation of RhB over 2.32wt% diatomite/g-C3N4 under visible light irradiation. The enhanced photo- activity is mainly attributed to the electrostatic interaction between g-C3N4 and negatively charged diatomite, synergis- tic effect lead to the efficient migration of the photogenerated electrons and holes of g-C3N4.
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