Boosting charge separation in graphdiyne quantum dots/hollow tubular carbon nitride heterojunction for water pollutant degradation

Key Words:BISPHENOL-A; PHOTOCATALYTIC DEGRADATION; G-C3N4 NANOSHEETS; PEROXYMONOSULFATE; TIO2; NANOCOMPOSITES; COMPOSITES; PHOSPHORUS; ACTIVATION; CATALYSIS

Abstract:Non-desirable solar energy absorption and poor charge transfer efficiency are two problems that limit the per-oxymonosulfate (PMS) photocatalytic techniques. Herein, a metal-free boron-doped graphdiyne quantum dot (BGDs) modified hollow tubular g-C3N4 photocatalyst (BGD/TCN) was synthesized to activate PMS and achieved effective space separation of carriers for degradation of bisphenol A. With 0.5 mM PMS, the degradation rate of bisphenol A (20 ppm) was 0.0634 min-1, 3.7-fold higher than that of TCN itself. The roles of BGDs in the dis-tribution of electrons and photocatalytic property were well identified by experiments and density functional theory (DFT) calculations. The possible degradation intermediate products of bisphenol A were monitored by mass spectrometer and demonstrated to be nontoxic using ecological structure activity relationship modeling (ECOSAR). Finally, this newly-designed material was successfully applied in actual water bodies, which further renders its promising prospect for actual water remediation.

Volume:646

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Translation or Not:no