期刊
CATALYSTS
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/catal12030247
关键词
g-C3N4; photodegradation; dyeing wastewater; thermal polymerization; crystallinity; active species
资金
- [21473126]
- [B2017010]
A highly efficient graphitic carbon nitride photocatalyst was synthesized for the visible light photodegradation of dyeing wastewater. The photocatalyst showed excellent performance and the O-2(-) and OH radicals were identified as the main active species. The photodegradation mechanism was proposed based on the characterization results.
A highly-efficient graphitic carbon nitride (g-C3N4) photocatalyst for visible light photodegradation of rhodamine B (RhB) and methyl orange (MO) simulating dyeing wastewater was synthesized by the thermal polycondensation of melamine. The photocatalysts were characterized by TG-DTG-DSC, XRD, EA, XPS, FT-IR, SEM, TEM, BET, PL and UV-vis DRS. The results showed that the photocatalytic performance of g-C3N4 at a higher calcination temperature was significantly enhanced, and its photocatalytic activities for the photodegradation of RhB and MO were remarkably improved by 64.91% and 41.83%, respectively, which was mainly attributed to the satisfactory crystallinity, stable graphene-like structure, large surface area, and excellent optical properties. It was found that center dot O-2(-) radicals and center dot OH radicals were the main active species for the photodegradation process by the free radicals trapping experiments and ESR analysis. The photodegradation mechanism of g-C3N4 was proposed predicated using the characterization results.
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