Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 19, Pages 16569-16576Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03885
Keywords
BiOCl; thiourea; hydroxyl radical; hierarchical nanostructure; visible light
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Funding
- National Natural Science Foundation of China [51602281]
- Natural Science Foundation of Jiangsu Province [BK20160473]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [XSJCX18-064]
- China Postdoctoral Science Foundation [2017M621832]
- Yangzhou University High -end Talent Support Program
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It remains an exciting challenge to achieve a direct production of large quantities of center dot OH, generated from photogenerated h(+) using visible-light-driven photocatalysts fabricated by a one-step method. In this work, a series of hierarchical interconnected BiOCl materials with a tunable absorption range for visible light have been successfully prepared through a one-pot molecular self-assembly technology at room temperature. Depending on the modification of polar organic molecules [i.e., thiourea (TU)], the nonpolar layered semiconductor (BiOCl) turned into an efficient visible-light photocatalyst because it possesses a narrower band gap by surface modification introducing oxygen defects. Meanwhile, the tunable three-dimensional hierarchical architecture of BiOCl was fabricated via the self-assembly of two-dimensional nanosheets with the aid of TU, leading to an enhanced specific surface area along with efficient electron-hole pair separation. Moreover, the obtained BiOCl-10 showed a more positive valence band with an optimized hierarchical porous structure, which produced a sufficient amount of center dot OH directly from the reaction between photogenerated h(+) and water molecules under visible light. Thereby, the BiOCl-10 materials exhibit high photocatalytic activities for almost completely degrading tetracycline and rhodamine B in 20 min, about 20 times better than that of pure BiOCl. Our work provided an innovation strategy that may deliver a promising way to fabricate BiOCl materials with highly efficient visible photocatalytic activity by direct production of large quantities center dot OH through its photogenerated h(+).
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