Abstract
Bismuth vanadate (BiVO4) is a promising photocatalyst for the degradation of organic pollutants, which is, however, limited by low surface area, poor charge separation, and sluggish oxygen activation. In this study, hollow BiVO4 (HBVO) architecture with oxygen vacancies was obtained from the bismuth-organic-framework CAU-17 via the Kirkendall effect. The optimized HBVO had porous walls of about 150 nm, a length of 5 µm, a diameter of 2 µm, and a surface area increased by a factor of four compared to BiVO4 nanoparticles (BVO-NP). HBVO exhibited good activity for the degradation of 2-chlorophenol via a hole-dominated direct dechlorination pathway. The photoactivity could be further improved by attaching an appropriate amount of copper tetraphenyl porphyrin (CuTPP) through hydrogen bonds and electrostatic interactions to HBVO. The amount-optimized 1.5CuTPP/HBVO demonstrated an activity that was higher by a factor of 4.5 and 2.3 than those of BVO-NP and HBVO, respectively. The improved visible-light activities are attributed to the enhanced charge separation via the constructed Z-scheme CuTPP/HBVO heterojunction, and the increased wide-visible-light response and promoted oxygen activation via the Cu-N4 sites due to the coupled CuTPP.
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