Abstract
The novel 2D/2D S-scheme heterostructure of BiOCl nanosheets coupled with CaIn2S4 nanosheets (CaIn2S4/BiOCl-SOVs), which contains surface oxygen vacancies (SOVs), has been successfully prepared by high-temperature calcination combined with a solvothermal synthetic strategy. Under visible-light irradiation, the apparent rate constant (Kapp/mim−1) for phenol degradation on the 1 wt% CaIn2S4/BiOCl-SOVs photocatalyst is about 32.8 times higher than that of pure BiOCl. The superior performance was attributed to the synergistic effect between the SOVs, CaIn2S4, and BiOCl, which can effectively narrow the bandgap and accelerate the interfacial charge separation of CaIn2S4/BiOCl-SOVs heterojunctions. Subsequently, it significantly promotes the generation of superoxide radicals (O2−), hydroxyl radicals, and h+, which participate in the photodegradation process of phenol. The catalyst still maintained a relatively high activity after repeated tests as a demonstration of its photostability. This work successfully proposed an efficient method to design a new 2D/2D S-scheme heterostructure with SOVs as possible photocatalysts in the field of environmental remediation.
Highlights
During the past few decades, with the rapid development of modern industrial and agricultural technology, energy and environmental issues have become important topics on a global level [1,2,3,4]
We report the construction of a new, well-designed 2D/2D CaIn2 S4 /bismuth oxychloride (BiOCl) S-scheme heterojunction by high-temperature calcination combined with a solvothermal method
The diffraction peak positions and corresponding crystal faces of the prepared BiOCl and BOC-surface oxygen vacancies (SOVs) can be indexed to JCPDS 06-0249.34 Pure BiOCl and all calcined samples exhibit main diffraction peaks attributed to (101), (110), (102), (200), (201), (113), (211), and (212) [34]
Summary
During the past few decades, with the rapid development of modern industrial and agricultural technology, energy and environmental issues have become important topics on a global level [1,2,3,4]. The removal of highly toxic and persistent organic pollutants contained in wastewater by employing semiconductor photocatalysis technology can be used as an attractive method to solve the problem of environmental water pollution. This technology has demonstrated unique advantages, including high efficiency, favorable economy, green and sustainable aspects, and environmental protection [5,6,7,8,9,10,11,12]. We report the construction of a new, well-designed 2D/2D CaIn2 S4 /BiOCl S-scheme heterojunction by high-temperature calcination combined with a solvothermal method. Based on the proven advantages, the applied strategy and methods can be used to design and construct other similar photocatalytic systems to fully utilize the abundant solar energy
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