Efficient Degradation of Phenol and 4‐Nitrophenol by Surface Oxygen Vacancies and Plasmonic Silver Co‐Modified Bi₂MoO₆ Photocatalysts

Abstract

In this work, the surface plasmon resonance effect of metallic Ag, surface oxygen vacancies (SOVs), and Bi 2 MoO 6 (BMO) material werer ationally combined to construct new oxygen-vacancy-rich Ag/Bi 2 MoO 6 (A/BMO-SOVs) photocatalysts. Their synergistic effect on the photocatalytic degradation of phenol and4 -nitrophenol under visible-light irradiation (l ! 420 nm) was also investigated. TEM, EPR, and Raman spectra demonstrate the co-existence of metallicA g nanoparticles, surface oxygen vacancies, and Bi 2 MoO 6 due to ac ontrolled calcination process. The experimental results disclose that the 2%A/BMO-SOVs-375 sample exhibited the highest photocatalytic activity for the degradation of both phenol and 4-nitrophenol under visible-light irradiation, achieving nearly 100 and 80 %r emoval efficiency,r espectively, and demonstrated the apparent reactionr ate constants (k app )1 83 and 26.5 times, respectively,h ighert han that of pure Bi 2 MoO 6 .T he remarkable photodegradation performance of A/BMO-SOVs for organic substances is attributed to the synergistic effect between the surface oxygen vacancies, metallic Ag nanoparticles, and Bi 2 MoO 6 ,w hich not only improves the visible-light response ability,but also facilitates charge separation. Thus, this work provides an effective strategy forthe design and fabrication of highly efficient photocatalysts through integrating surface oxygen vacancies and the surfacep lasmon resonance effect of nanoparticles, which has the potential for both water treatment and air purification.

Controllable Hydrothermal Synthesis and Photocatalytic Performance of Bi2MoO6 Nano/Microstructures

“…Figure 5b shows the Raman spectra of BMO and BMO-CTAB. Both pure BMO and BMO-CATB show many identical characteristic peaks at 294, 349, 399, 718, 798 and 839 cm −1 , which illustrates the consistency of the crystal structure of the prepared samples [44]. The characteristic peaks at 718, 798 and 839 cm −1 correspond to the asymmetric, symmetric and asymmetric tensile vibrations of the MoO 6 octahedron, respectively.…”

Synergism of carbon quantum dots and Au nanoparticles with Bi2MoO6 for activity enhanced photocatalytic oxidative degradation of phenol

“…The photogenerated electrons can thus be shuttled freely along the conducting paths of the CQDs, promoting e − /h + pairs separation at the same time limiting their recombination by accumulating holes on the BMO surface ( Scheme 2 ). The as-fabricated CQDs/Au/BMO composite exhibited a superior catalytic activity, compared to previously reported catalysts for the degradation of phenolic compounds, such as CQDs/Bi 2 MoO 6 , 36 Au/Bi 2 MoO 6 @TiO 2 NTAs, 43 Au/Bi 2 MoO 6 , 46 Ag/Bi 2 MoO 6 -SOVs, 56 Pd-rGO-Bi 2 MoO 6 , 66 F–Bi 2 MoO 6 , 67 and Bi 2 MoO 6− x @Bi 2 MoO 6 , 68 Bi 2 MoO 6 /CNTs/g-C 3 N 4 , 69 CdS/Bi/Bi 2 MoO 6 , 70 and so on (Table S2 † ). The analytical superiority of CQDs/Au/BMO confirms the composites practical work ability for removing phenol from wastewater under visible light irradiation.…”

“…Meanwhile, the ROS capture experiments were also carried out by employing ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), isopropyl alcohol (IPA) and benzoquinone (BQ) as scavengers for h + , ˙OH and ˙O 2 -, respectively. 56 The results indicate that EDTA-2Na and BQ could inhibit the photocatalytic degradation of phenol. However, IPA's effect on photocatalytic activity was negligible (Fig.…”

Plate-to-Layer Bi2MoO6/MXene-Heterostructured Anode for Lithium-Ion Batteries

“…4a. The XRD pattern of the as-prepared Bi 2 MoO 6 nanoplates consists of strong (020) peak at 10.9° and (131) peak at 28.2° as well as several weak peaks corresponding to the (200), (060), (151), (202), and (062) planes of pristine Bi 2 MoO 6 [49][50][51]. After the assembly process, the (002) peak of MXene occurs in the patterns of the composites, indicating the successful combination of Bi 2 MoO 6 and MXene.…”

“…The Ti 2 p core level was fitted with seven components, including three doublets (Ti 2 p 3/2 –Ti 2 p 1/2 ) and a single peak located at 460.8 eV. The three doublets centered at 454.7/462.2, 455.9/464.4, and 458.7/466.1 eV could be assigned to Ti–C, Ti(II), and Ti–O, respectively, while the single peak might result from TiO 2 , implying the partial oxidation of the MXene during the construction of the Bi 2 MoO 6 /MXene heterostructure [ 40 , 50 ].…”