One-Pot Fabrication of Hierarchical Floating Bi–Bi₂S₃–Bi₂WO₆/Expanded Perlite Photocatalysts for Efficient Photocatalysis of Organic Contaminants Utilized Sunlike Illumination

Abstract

Photocatalysis currently faces a number of challenging issues, such as low efficiency, expensive precursors of noble metals, and difficult recycling of powder, which are grievous impeders for powder photocatalysts in practical applications of environmental remediation. Hence, we have fabricated desirable cabbagelike floating Bi–Bi2S3–Bi2WO6@EP (expanded perlite) photocatalysts via a one-pot modified hydrothermal process. The structural morphology and reaction mechanism of as-fabricated designed photocatalysts were comprehensively investigated by physicochemical techniques. The photocatalytic efficacies of 1% Bi–Bi2S3–Bi2WO6@EP were obviously evaluated by the degradation of 4-chlorophenol (4-CP), rhodamine B (RhB), and methyl orange (MO) with enhanced rate constants (k) of 0.051, 0.073, and 0.075 min–1, respectively, utilizing sunlike irradiation. All these enhanced photocatalytic efficacies are assigned to the successful deposition of optimal contents of ternary heterojunction (3C), surface plasmon resonance effect (SPR) of Bi, enhanced photocurrent, maximum mobility of photoinduced charge carriers, efficient direct illumination, and aerated oxygenation and photogeneration of most reactive species.

Ultrafine Ag Nanoparticles Anchored on Hollow S-Doped CeO2 Spheres for Synergistically Enhanced Tetracycline Degradation under Visible Light

“…The formation of • OH and • O 2 – radicals in the photodegradation systems was further certified by electron paramagnetic resonance (EPR) spectra utilizing 5, 5-dimethyl-1-pyrroline- N -oxide (DMPO) as the capture agent. , Figure a depicts that the characteristic EPR signals of DMPO- • O 2 – were found for those samples after 3 min irradiation, which points out that • O 2 – was produced in the photocatalytic reaction. 3Ag/CeO 2– x S x shows significantly enhanced EPR signal intensity compared with CeO 2 and CeO 2– x S x , indicating that 3Ag/CeO 2– x S x has greater capacity to activate O 2 molecules into • O 2 – species.…”

Recent Progress on Metallic Bismuth‐Based Photocatalysts: Synthesis, Construction, and Application in Water Purification

“…Such a conventional type‐II heterojunction coupling with metallic Bi can facilitate the separation of photogenerated carriers in composites, similar works including Bi/α‐Bi 2 O 3 /g‐C 3 N 4 , [ 59 ] Bi/BiOI‐Bi 2 O 3 , [ 61 ] g‐C 3 N 4 @Bi@Bi 2 WO 6 , [ 107 ] Bi/BiOCl–TiO 2 ‐CQDs, [ 108 ] Bi/Bi 2 O 2 CO 3 /Bi 2 WO 6 , [ 109 ] and Bi–Bi 2 S 3 –Bi 2 WO 6 @EP. [ 110 ] However, the conventional type‐II heterojunction has an obvious shortcoming. Photogenerated holes and electrons will accumulate on the less positive VB and the less negative CB, respectively, which will reduce the redox capacity of charge carriers.…”

One-dimensional Z-scheme NiO/Bi2WO6 heterostructures for enhancing visible-light photocatalytic activity

“…Among them, bismuth tungstate (Bi 2 WO 6 ), a typical n-type semiconductor with Aurivillius-type layered structure and suitable band gap (Qiu et al 2019), possesses the strong oxidizing property due to the abnormal valence band (VB) position (Li et al 2018a). However, the photocatalytic activity of pristine Bi 2 WO 6 is dramatically hindered due to the limited optical response and rapid recombination of photogenerated electron-hole pairs (Radha et al 2019;Khan et al 2019). Therefore, it is essential to overcome these bottlenecks and provide new strategies for the development of highly efficient photocatalytic materials used in the environmental field.…”