Comparison of photocatalytic reaction-induced selective corrosion with photocorrosion: Impact on morphology and stability of Ag-ZnO

Abstract

In previous work, the photocatalytic stability during the recycled degradation is employed to evaluate the inhibitory effect of photocorrosion. Then, a significant question arises: is the photocatalytic stability only related to the photocorrosion for ZnO? The answer turns out to be no in our work. The phenomenon of photocatalytic reaction-induced selective corrosion of ZnO nanosheets was firstly revealed. It is found that the special corrosion not only needs UV light irradiation, but also results from the photocatalytic reaction. Then, the impacts of this special corrosion and photocorrosion on morphology and photocatalytic stability were compared. It is found that the PRIS corrosion shows more mass loss, more selective etching and more decrease of unit mass photocatalytic activity than that of photocorrosion. The results indicate that the special corrosion-induced active face loss rather than the photocorrosion-induced mass loss can be fatal for the photocatalytic stability. Accordingly, a direct and visual confirmation of inhibitory effect of loaded Ag against selective corrosion is revealed.

In-situ synthesis of amorphous silver silicate/carbonate composites for selective visible-light photocatalytic decomposition

“…However, the absorption peaks of RhB located at ~554 nm doesn’t change too much (Fig. 9) 39 . As for two cationic dyes MB and RhB, we speculate that the discrepancy in adsorption capacities among them can be ascribed to the molecule size 29,35 .…”

“…Figure 11A indicates that the recyclability for AgSiO/Ag 2 CO 3 -5:1 composite. After six successive cycles, AgSiO/Ag 2 CO 3 -5:1 composite still possesses ~89% degradation rate of MB after ~40 min VL irradiation, indicating its high recyclability 30,39,43 . The results indicate that the incorporation of AgSiO with Ag 2 CO 3 photocatalyst successfully improves the VL photocatalytic performance and restrains the photocorrosion in a large level 13,44 .…”

“…The characteristic peak intensities of MB gradually decrease by prolonging the irradiation time, and the adsorption peaks disappear within ~40 min irradiation 12,39 . The corresponding optical photographs of MB degradation using different photocatalysts under different irradiation times are collected and displayed in Fig.…”

RGO‐ZnSe Photocatalyst towards Solar‐Light‐Assisted Degradation of Tetracycline Antibiotic Water Pollutant

“…Various photocatalysts such as TiO 2 , V 2 O 5 , NaNbO 3 , gC 3 N 4 , BWO – GO were employed to degrade TC. The semiconductor photocatalysts such as TiO 2 and ZnO have broad bandgap and hence absorb only ultraviolet light. This accounts for only 3–4% of the sunlight.…”

Improving Photocatalytic Performance from Bi2WO6@MoS2/graphene Hybrids via Gradual Charge Transferred Pathway

“…At present, various types of semiconductor photocatalysts have been reported such as TiO 2 3–5 and ZnO 6–8 with broad bandgap which absorbs only ultraviolet light which accounts for only about 3~4% of sunlight. Others like CdS 9–11 and CdSe 12–14 , with narrow band gap which absorbs visible light, whereas contain cadmium element which is a widespread environmental pollutant with high toxicity.…”