Abstract
Molecular oxygen activated by visible light to generate radicals with high oxidation ability exhibits great potential in environmental remediation The efficacy of molecular oxygen activation mainly depends on the separation and migration efficiency of the photoinduced charge carriers. In this work, 2D/2D CdIn2S4/g-C3N4 heterojunctions with different weight ratios were successfully fabricated by a simple electrostatic self-assembled route. The optimized sample with a weight ratio of 5:2 between CdIn2S4 and g-C3N4 showed the highest photocatalytic activity for tetracycline hydrochloride (TCH) degradation, which also displayed good photostability. The enhancement of the photocatalytic performance could be ascribed to the 2D/2D heterostructure; this unique 2D/2D structure could promote the separation and migration of the photoinduced charge carriers, which was beneficial for molecular oxygen activation, leading to an enhancement in photocatalytic activity. This work may possibly provide a scalable way for molecular oxygen activation in photocatalysis.
Highlights
The energy crisis and environmental pollution are serious problems worldwide
The high-resolution TEM (HRTEM) pattern of the CIS is illustrated in Figure 2f; the observable lattice space of 0.324 nm marked in Figure 2f could be indexed to the (311) crystal plane of CdIn2 S4
5d shows the UV-vis spectra of tetracycline hydrochloride (TCH) at different periods of the photocatalytic proof visible light irradiation, the decrease in TCH could be attributed to photocatalysis
Summary
The energy crisis and environmental pollution are serious problems worldwide. Environmental pollution originating from refractory organic pollutants, especially antibiotics, has an extremely negative influence on humans. Nanomaterials 2021, 11, 2342 could inhibit the speedy recombination of photoexcited charge carriers and alleviate the photo-corrosion more efficiently, owing to the spatial location of photoexcited electrons and holes. Described an ultrasonic exfoliation route for fabricating g-C3 N4 nanosheets with boosted photocatalytic performance; the abundant reaction active sites and the low recombination rate of charge carriers were attributed to the enhanced photocatalytic performances [34]. Qu et al combined freeze-dried, ultrasonic and solvothermal process-synthesized g-C3 N4 nanosheets with an atomically thin mesoporous structure that exhibited superior photocatalytic hydrogen evolution performance; the ultrathin nanostructure could promote light absorption as well as shorten the migration time and migration distance of photoexcited charge carriers [35]. The constructed 2D/2D nanostructures could efficiently facilitate the separation and transfer of photoexcited charge carriers between hetero-interfaces, which is favorable for the process of molecular oxygen activation, resulting in improved photocatalytic activity
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