Abstract
Ag2CO3/AgBr/graphene oxide (Ag2CO3/AgBr/GO) ternary composites with different percentages of GO were fabricated by a facile co-precipitation strategy. The composites were characterized in the aspect of phase composition, light absorption performance, and micromorphology etc. The activity of the composites was studied by photocatalytic degradation of colored organic dye (rhodamine B, RhB) and colorless organics (phenol) under the shine of visible light. The optimized Ag2CO3/AgBr/GO-7.5 composites revealed the most excellent photocatalytic activity, which exhibited an apparent reaction rate constant exceeding that of pristine AgBr and Ag2CO3 by a factor of 107 and 5.63, respectively. The outstanding performance can be attributed to the effective separation of electrons and holes as well as the strong light absorption ability resulting from the Ag2CO3/AgBr/GO heterostructure. Moreover, it was verified that h+ and •O2− were two major active substances responsible for the decomposition of organic pollutants according to the free radical-trapping experiments. Besides, a probable reaction mechanism referring to the charge transfer and separation in the composites was proposed and discussed in detail.
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This work was supported by the Guangzhou Science and Technology Project (grant number 201904010131); the National Natural Science Foundation of China (grant number 51302043); the National Natural Science Foundation of China-Guangdong Joint Fund (grant number U1401246); and the Science and Technology Program of Guangdong Province of China (grant numbers 2017B050504004, 2015B010135011).
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Si, M., Wang, W., Guan, Q. et al. Facile fabrication of highly catalytic-active Ag2CO3/AgBr/graphene oxide ternary composites towards the photocatalytic wastewater treatment. Environ Sci Pollut Res 28, 4173–4183 (2021). https://doi.org/10.1007/s11356-020-10740-0
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DOI: https://doi.org/10.1007/s11356-020-10740-0