Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 3, Pages 998-1004Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10046b
Keywords
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Funding
- National Natural Science Foundation of China [51522303, 21602154]
- National Key Research and Development Program of China [2017YFA0207500]
- Natural Science Foundation of Tianjin [17JCJQJC44600]
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Covalent organic frameworks (COFs) have received increasing research interest as an emerging class of crystalline and porous polymers. Herein, we prepared two new benzothiadiazole (BT) functionalized COFs (i.e. TPB-BT-COF and TAPT-BT-COF), which exhibit good crystallinity, high porosity, and excellent stability in harsh conditions. Their applications for photoreduction of Cr(VI) species under visible light irradiation were investigated. Over 99% Cr(VI) was reduced by utilizing TPB-BT-COF as catalyst without any sacrificial agents or additional pH adjustment. The photocatalytic rate of TPB-BT-COF is faster than that of TAPT-BT-COF, which can be attributed to more negative conduction band and narrower bandgap. Our results indicate that co-condensation of electron deficient units into the COF skeleton is conducive to efficient separation of photoexcited electrons and holes, which in turn leads to superior photocatalytic activities.
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