Construction of exfoliated g-C3N4 nanosheets–BiOCl hybrids with enhanced photocatalytic performance

Abstract

Exfoliated g-C 3 N 4 nanosheets (CNs) were composited with bismuth oxychloride (BiOCl) to fabricate a series of hybrids via a facile chemical deposition-precipitation method in this investigation. The as-synthesized BiOCl-CNs hybrids were then fully characterized by a collection of analytical techniques. It was obviously observed that CNs were in intimate contact with hierarchical BiOCl flowerlike units to form heterojunction structures, which facilitates transfer and efficient separation of photoinduced electronhole pairs, thus greatly increasing catalytic activity upon visible light irradiation. Together with other merits such as enlarged specific surface area, favorable optical properties, and suitable energy-band structures, these robust BiOCl-CNs hybrids showed significantly enhanced photocatalytic performance towards Rhodamine B (RhB) dye removal. Under identical conditions, the apparent photocatalytic reaction rate of the best hybrid BiOCl-CNs-3% was about 2.1 and 26.6 times as high as those of BiOCl and CNs alone, respectively. A possible photocatalytic mechanism was also proposed by means of active species trapping measurements, revealing that superoxide radicals (cO 2 À ) played a crucial role during the catalytic process.

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

“…The blue shift of characteristic adsorption peak of RhB during photocatalysis is observed in Fig. S5 and is attributed to the deethylation phenomenon [46]. The experimental data were subsequently fitted by a pseudo-first-order model to study reaction kinetics of the RhB degradation and the corresponding apparent reaction constants (k) were listed in Table 1.…”

“…To fully understand the photocatalytic process and further propose a reasonable mechanism, hydroxyl radicals and holes trapping experiments were conducted to realize roles of both oxidative species through addition of a desired amount of IPA [46,47] and EDTA-2Na [38,39,46], respectively. From Fig.…”

Construction of novel ternary component photocatalyst Sr0.25H1.5Ta2O6·H2O coupled with g-C3N4 and Ag toward efficient visible light photocatalytic activity for environmental remediation

“…Photoluminescence spectra has been widely applied to reveal the migration of photogenerated charge carriers in the semiconductor heterojunctions [69,70]. From Fig.…”

Bismoclite (BiOCl) in the San Francisco de los Andes Bi–Cu–Au Deposit, Argentina. First Occurrence of a Bismuth Oxychloride in a Magmatic–Hydrothermal Breccia Pipe and Its Usefulness as an Indicator Phase in Mineral Exploration

“…By means of FTIR spectroscopy, they recorded the sharpest absorption bands of pure BiOCl at 529, 524, 535 and 523 cm´1, respectively, and a weak peak at approximately 1650 cm´1 (Table 8). Chang et al (2014) and Xie et al (2014) [71,72] reported a broad, weak absorption at 3450 cm´1 (Table 8). Ye et al (2012) [69] and Bai et al (2014) [70] published IR spectrums up to 2000 cm´1 and documented a minor peak at 1395 cm´1 (Table 8).…”

“…The [69][70][71][72]. By means of FTIR spectroscopy, they recorded the sharpest absorption bands of pure BiOCl at 529, 524, 535 and 523 cm´1, respectively, and a weak peak at approximately 1650 cm´1 (Table 8).…”