Core-shell ZIF-8@MIL-68(In) derived ZnO nanoparticles-embedded In2O3 hollow tubular with oxygen vacancy for photocatalytic degradation of antibiotic pollutant

Self-Assembly of a 3D Hollow BiOBr@Bi-MOF Heterostructure with Enhanced Photocatalytic Degradation of Dyes

“…To further determine the active species ( • O 2 – , h + , or • OH) of the degradation reaction, ESR spectra of BiOBr@Bi-MOF were obtained via 5,5-dimethyl-1-pyrroline- N -oxide (DMPO) and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as probes. According to the results in Figure b,c, no signals of DMPO- • O 2 – and DMPO- • OH were observed under dark conditions, indicating that light was essential to produce active substances . After visible light irradiation, only the DMPO- • O 2 – signal appeared in the ESR spectra.…”

“…On the other hand, it can be seen from Figure b that the binding energies of 67.6 and 68.6 eV were assigned to Br 3d 5/2 and Br 3d 3/2 of BiOBr, respectively . As shown in Figure c, the O 1s XPS spectrum of BiOBr could be deconvoluted into three peaks at 529.4, 530.8, and 532.3 eV, which were attributed to Bi–O, the surface −OH, and absorbed H 2 O (O w ), respectively. , Significantly, the proportion of surface −OH was enhanced in comparison with pristine BiOBr, while the percentage of Bi–O decreased, which was in agreement with EDS results and further determined the existence of Bi-MOF on the surface of BiOBr. , Noteworthily, compared to the original BiOBr, the binding energies of Bi 4f, Br 3d, and O 1s in BiOBr@Bi-MOF show significant positive shifts, suggesting that photogenerated electrons on the surface of BiOBr tended to migrate to Bi-MOF, thereby improving the separation efficiency of electron–hole pairs . Additionally, the C 1s spectra showed three peaks at 284.3, 285.8, and 287.9 eV, which could belong to CC, C–C, and C–O of Bi-MOF, respectively (Figure d). , This demonstrated that Bi-MOF and BiOBr coexisted, which was consistent with the XRD results (Figure a).…”

“…According to the results in Figure 5b,c, no signals of DMPO-• O 2 − and DMPO-• OH were observed under dark conditions, indicating that light was essential to produce active substances. 53 After visible light irradiation, only the DMPO-• O 2 − signal appeared in the ESR spectra. On the contrary, the signal of TEMPO was obvious in the dark due to the absence of holes (Figure 5d), while the holes generated by light could neutralize the TEMPO signal and weaken it, further verifying that • O 2 − and h + were the main radical species formed in the photocatalytic reaction.…”

“…20,47 Significantly, the proportion of surface −OH was enhanced in comparison with pristine BiOBr, while the percentage of Bi−O decreased, which was in agreement with EDS results and further determined the existence of Bi-MOF on the surface of BiOBr. 24,48 Noteworthily, compared to the original BiOBr, the binding energies of Bi 4f, Br 3d, and O 1s in BiOBr@Bi-MOF show significant positive shifts, suggesting that photogenerated electrons on the surface of BiOBr tended to migrate to Bi-MOF, thereby improving the separation efficiency of electron−hole pairs. 49 Additionally, the C 1s spectra showed three peaks at 284.3, 285.8, and 287.9 eV, which could belong to CC, C−C, and C−O of Bi-MOF, respectively (Figure 3d).…”

Synthesis and properties of Sm‐TiO2 coupled with g‐C3N4 for improved photocatalytic degradation toward methylene blue and tetracycline under visible‐light irradiation

“…[5] Photocatalytic materials are the core components that determine the degradation and removal of the target pollutants. Owing to their good chemical stabilities and optical activities, [6][7][8] various semiconductor materials, such as titanium dioxide (TiO 2 ), [9,10] WO 3 , [11] Bi 2 WO 6, [12] SnO 2, [13] and ZnO [14] have been widely utilized for sewage treatment. TiO 2 is frequently used in photocatalytic fuel cells, solar cells, and gas sensors due to its nontoxicity, good stability, low price, and simple preparation.…”