| The organic semiconductors applied in photocatalytic degradation as photosensitizers or catalysts have attracted wide attention due to wide range of light absorption and the regulation of molecular and electronic structure.But the large binding energy and short transmission distance of excitons restrict the photocatalytic activity.The photocatalytic degradation system of organic semiconductor-porphyrin aggregates was optimized,and the activity was improved by interface charge transfer interact,activating persulfate and constructing photocatalytic-Fenton synergistic system.In the degradation system of porphyrin aggregate（CTAB-TCPP）and its composite with peryleneimide aggregate（TCPP/PDINH）,hole and electron can be separated by introducing Fe3+through interfacial charge transfer to inhibit the recombination of carriers.The photocatalytic activity was improved by holes left and various active species.The rate constants of degradation in TCPP/PDINH/Fe3+,PDINHs/Fe3+and CTAB-TCPP/Fe3+systems were 16.8,65.3 and 14.4 times of that without Fe3+,respectively.In the degradation system of porphyrin aggregate CTAB-TCPP,peroxodisulfate（PDS）was introduced as electron trapping agent,and PDS was also activated by photocatalysis to degrade phenol.The degradation rate in CTAB-TCPP/PDS system was87%higher than without PDS.PDS activated by porphyrin aggregates improves the separation efficiency of photocarriers and degrades pollutants by various active species.TypeⅡheterojunction compositeα-Fe2O3/TCPP was constructed to achieve photocatalytic-Fenton synergistic degradation of tetracycline.The degradation rate ofα-Fe2O3/TCPP was 72%and 25%higher than TCPP andα-Fe2O3.The degradation rate constant was 17.7 and 2.4 times larger than photocatalysis and Fenton.The charge transfer betweenα-Fe2O3/TCPP heterojunction improves the carrier separation,electrons promote the conversion of Fe3+to Fe2+,improving the Fenton reaction efficiency.Figure 58;Table 4;Reference 117... |
