In:
Environmental Science: Nano, Royal Society of Chemistry (RSC), Vol. 8, No. 12 ( 2021), p. 3655-3664
Kurzfassung:
Bismuth oxide (Bi x O y ), an important bismuth-based semiconductor with visible-light response, good structural stability and non-toxicity, has been identified as a potential candidate for chromium (Cr( vi ))-containing wastewater remediation. However, the poor broadband light response and easy electron–hole recombination generally lead to unfavorable catalytic activity. Constructing a heterostructure is demonstrated to be an effective strategy for improving the catalytic performance of Bi x O y -based photocatalysts due to the improved photoresponse and promoted interfacial carrier mobility. Herein, CdS nanoparticles with low work function and good visible-light response were chosen as the cocatalyst to construct the p–n type Bi x O y /CdS heterostructure via a solvothermal method. Due to the formation of typical II-type induced mechanism, the interfacial carrier mobility and broadband light response were effectively improved; thereby, remarkably enhanced simulated solar-light (SSL)-induced aqueous Cr( vi ) reduction activity (0.1265 min −1 ) was achieved by the optimum Bi x O y /CdS catalyst in the absence of scavengers, which is ∼34.2-fold greater than pristine Bi x O y (3.7 × 10 −3 min −1 ) and possesses distinct advantage compared with previous reports. Also, the promoted carrier transfer effectively suppresses photocorrosion of the CdS microstructure, resulting in a desirable photostability under long-term photoinduction. This study provides a feasible strategy for aqueous Cr( vi ) pollution remediation.
Materialart:
Online-Ressource
ISSN:
2051-8153
,
2051-8161
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
2758235-8
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