Graphite carbon nitride nanosheets decorated with ZIF-8 nanoparticles: Effects of the preparation method and their special hybrid structures on the photocatalytic performance

Publication date: 25 September 2018 Source:Journal of Alloys and Compounds, Volume 762 Author(s): Dashui Yuan, Jing Ding, Jie Zhou, Lei Wang, Hui Wan, Wei-Lin Dai, Guofeng Guan A highly efficient ZIF-8/g-C3N4 photocatalyst was prepared by a facile ultrasonic in-situ method. The structure-property relationship of ZIF-8/g-C3N4 composite was analysed by various characterization techniques. The comprehensive study illustrated that ZIF-8 served as an adsorbent to capture the substrates in the contaminated solution and increased the contact possibilities of the active species and substrates. The formation of ZIF-8/g-C3N4 hybrids helped to significantly enhance visible light absorption and facilitate charge transfer and separation of the photogenerated electron-hole pairs, eventually improving the photocatalytic efficiency. Meanwhile, compared with ZIF-8/g-C3N4 composites obtained by incipient wetness impregnation method, ultrasonic in-situ synthesis contributed to hindering the aggregation of g-C3N4 nanosheets and simultaneously promoting ZIF-8 well dispersed on the surface of g-C3N4 nanosheets. The synergistic effect of preparation method and special hybrid structure was studied in-depth and could significantly enhanced photocatalytic activity and stability for the degradation of organic pollutants (such as tetracycline, rhodamine B and methyl orange) under visible light irradiation. The reaction rate constant K values of optimal ratio sample for degradation of TC, RhB an...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research