Fabrication of direct Z-scheme black phosphorus nanosheets/Ag2CO3 heterojunction photocatalyst with enhanced stability and visible light photocatalytic activity

Abstract

In this paper, PDDA-functionalized black phosphorus nanosheets (BP) was used to construct BP/Ag 2 CO 3 heterojunction photocatalyst by a simple co-precipitation process. The morphology, photoelectrochemical, and photocatalytic performance of BP/Ag 2 CO 3 heterojunction photocatalyst were systematically characterized and analyzed. BP was proved to enhance the transport efficiency and restrain the recombination efficiency of the carriers in the BP/Ag 2 CO 3 heterojunction. At the same time, BP greatly suppressed the Ag 2 CO 3 photocorrosion and improved the stability for methyl orange (MO) degradation. After four cycles, compared with the 19.2% degradation rate of MO in pure Ag 2 CO 3 , the photocatalytic activity remained as high as 87.1% in 15-BP/Ag 2 CO 3 heterojunction. The Mott-Schottky and active species capture experiments enabled us to obtain the BP/Ag 2 CO 3 heterojunction band gap configuration, and propose the reaction mechanism of the direct Z-scheme. The in-situ X-ray photoelectron spectroscopy (XPS) analysis and work function calculation verified the charge transfer in BP/Ag 2 CO 3 direct Z-scheme heterojunction. This Z-scheme mechanism interpreted the enhanced photocatalytic stability of BP/ Ag 2 CO 3 for inhibiting the Ag ? photoreduction in the conduction band of Ag 2-CO 3 , and meanwhile elucidated the extremely improved photocatalytic activity by restraining the recombination of electron-hole pairs. This work is expected to Handling Editor: Mark Bissett.

Silver-decorated black phosphorus: a synergistic antibacterial strategy

“…Decorating metal nanoparticles such as silver (Ag) on BP was ideal potential countermeasure to improve the photocatalytic antibacterial activity [24][25][26]. On one hand, combining the tunable bandgap of BP nanosheet and the LSPR effect of AgNPs, the BP@AgNPs nanohybrid is highly expected to achieve synergistically enhanced photocatalytic activity under visible light irradiation [27][28][29]. On the other hand, AgNPs could also act as efficient electron acceptors to accelerate electron transfer, thus suppressing the recombination of electron-hole pairs in the photocatalyst process [30].…”

Construction of novel flower-like functionalized black phosphorus nanosheets/P-doped BiOCl S-scheme photocatalysts with improved photocatalytic activity in RhB and Cr(vi) degradation

“…Generally, Pt nanoparticles, reduced from H 2 PtCl 6 by accepted electrons, can be used for the characterization of photogenerated electron flow, and MnO 2 , oxidized from MnCl 2 by accepting the hole, characterizes the hole transfer route. 41–43 Fig. 14 illustrates the TEM images of photodeposition of MnO 2 nanoparticles on 15%-BP/P-BiOCl.…”

Renaissance of elemental phosphorus materials: properties, synthesis, and applications in sustainable energy and environment

“…Wang et al have synthesized a direct Z-scheme heterojunction photocatalyst composed of PDDA-functionalized black-P nanosheets and Ag 2 CO 3 by co-precipitation. 708 The black-P/Ag 2 CO 3 composite has a high degradation efficiency as exemplified by the mineralization of 94.1% of methyl orange into CO 2 and H 2 O within 30 minutes, which is better than that of Ag 2 CO 3 (43.3%). After four irradiation cycles, the activity of the black-P/Ag 2 CO 3 composite photocatalytic activity is 87.1%, whereas the pristine Ag 2 CO 3 shows a 19.2% degradation rate (Fig.…”