“…For diffraction peak 2θ at 35.54° and 39.41° shows converges after irradiation, produce single diffraction peak 2θ at 37.42°. These phenomena at low composition of CuO (≤ 4 wt%) indicated that the atoms are unstable when exposed to radiation, some of the atom break the bond with binder (cement) and moves or come out from the atomic structure of composite 44 . Figure 1 ( a ) X-ray diffraction (XRD) spectra, ( b ) Crystallite Size determined from XRD spectra, and ( c ) Fourier transform infra-red (FTIR) spectra of composites PBFC for various amount of CuO in composite for irradiation and non irradiation.…”
Section: Results and Discassionmentioning
confidence: 99%
“…The very small peak at the wavenumber of 1740 cm −1 was identified stretching of the C=O group and the broad and pronounced peak at the wavenumber of 1437 cm −1 indicated C–O–C stretching CH 3 bending vibrations 1 , 48 . The absorption bands in the wavenumber at 3500 cm −1 are attributed to the O–H stretching vibration of adsorbed water molecules 44 .…”
Composite cement/BaSO4/Fe3O4/CuO with a thickness of 0.6 cm for various amounts of CuO: 2 wt%, 4 wt%, 6 wt%, and 8 wt% were successfully synthesized for the X-ray radiation shield. The bonding characteristics of composite and structural properties were determined using Fourier transform infrared spectra for the wavelength range of 4000–400 cm−1 and X-ray diffraction with the range of 2θ from 25° to 50°, respectively. The shielding ability was measured using a mobile X-ray with an energy of 55, 66, and 77 keV for determining the mass and linear attenuation coefficient, electronic and atomic cross-section. These shield characteristics best agreement with theoretical calculation from the XCOM database for energy < 77 keV with half value layer (HVL) < 0.3 cm. The best shielding in this study indicated by the lowest HVL and MFP is composite for CuO 8 wt%. The HVL and MFP shows better values compared to the previous reported using composite rubber-based, indicated high potentials composite in this study for design new and efficient radiology rooms as an alternative concrete, especially for X-ray radiation, in the future.
“…For diffraction peak 2θ at 35.54° and 39.41° shows converges after irradiation, produce single diffraction peak 2θ at 37.42°. These phenomena at low composition of CuO (≤ 4 wt%) indicated that the atoms are unstable when exposed to radiation, some of the atom break the bond with binder (cement) and moves or come out from the atomic structure of composite 44 . Figure 1 ( a ) X-ray diffraction (XRD) spectra, ( b ) Crystallite Size determined from XRD spectra, and ( c ) Fourier transform infra-red (FTIR) spectra of composites PBFC for various amount of CuO in composite for irradiation and non irradiation.…”
Section: Results and Discassionmentioning
confidence: 99%
“…The very small peak at the wavenumber of 1740 cm −1 was identified stretching of the C=O group and the broad and pronounced peak at the wavenumber of 1437 cm −1 indicated C–O–C stretching CH 3 bending vibrations 1 , 48 . The absorption bands in the wavenumber at 3500 cm −1 are attributed to the O–H stretching vibration of adsorbed water molecules 44 .…”
Composite cement/BaSO4/Fe3O4/CuO with a thickness of 0.6 cm for various amounts of CuO: 2 wt%, 4 wt%, 6 wt%, and 8 wt% were successfully synthesized for the X-ray radiation shield. The bonding characteristics of composite and structural properties were determined using Fourier transform infrared spectra for the wavelength range of 4000–400 cm−1 and X-ray diffraction with the range of 2θ from 25° to 50°, respectively. The shielding ability was measured using a mobile X-ray with an energy of 55, 66, and 77 keV for determining the mass and linear attenuation coefficient, electronic and atomic cross-section. These shield characteristics best agreement with theoretical calculation from the XCOM database for energy < 77 keV with half value layer (HVL) < 0.3 cm. The best shielding in this study indicated by the lowest HVL and MFP is composite for CuO 8 wt%. The HVL and MFP shows better values compared to the previous reported using composite rubber-based, indicated high potentials composite in this study for design new and efficient radiology rooms as an alternative concrete, especially for X-ray radiation, in the future.
“…CuO has a narrow band gap and is an excellent candidate in the context, owing to its outstanding optical, electrical, and thermal properties. 13 Yu et al investigated CuO-modified TiO 2 in aqueous glycerol solution; the material exhibited efficient hydrogen evolution at a rate of 2061 μmol g −1 h −1 under UV illumination. 14 Zhu et al synthesized a one-dimensional core−shell heterostructure with CuO nanowires (NWs) as the core and anatase TiO 2 nanosheets (NSs) as the shell, in which the CuO NWs not only played the role of skeletons but also acted as good cocatalysts, significantly enhancing the hydrogen yield.…”
Section: Introductionmentioning
confidence: 99%
“…Using this strategy, TiO 2 can be designed to form composites with other narrow-band-gap semiconductors, expanding their absorption to cover a larger portion of the solar spectrum, even including the visible region. CuO has a narrow band gap and is an excellent candidate in the context, owing to its outstanding optical, electrical, and thermal properties . Yu et al investigated CuO-modified TiO 2 in aqueous glycerol solution; the material exhibited efficient hydrogen evolution at a rate of 2061 μmol g –1 h –1 under UV illumination .…”
The development of photocorrosion-resistant, recoverable, and stable photocatalysts for high-efficiency visible light photocatalytic production of hydrogen is a very urgent task. Herein, a strategy to fabricate CuO@TiO 2 heterojunction photocatalysts (CuTi-X) by calcining a dual metal−organic framework at different temperatures has been reported. The results reveal that the CuTi-X catalysts have a regular morphology, highly porous structure, and large specific surface area, providing more contact sites for surface mass transfer in photocatalytic reactions. The TiO 2 component is in close contact with the CuO layer uniformly supported on the surface, which facilitates the migration and separation of photogenerated carriers. Optical and electrochemical analyses further confirm that the optimized CuO@TiO 2 (CuTi-450) heterojunction exhibits an extended photogenerated carrier lifetime and a reduced mass transfer resistance. CuTi-450 shows a photocatalytic hydrogen evolution rate under visible light irradiation of 1458.1 μmol g −1 h −1 , which is 36.2 and 5.5 times higher than that of the single TiO 2 (Ti-450) and CuO (Cu-450) components, respectively, and remains stable after four reaction cycles. This work opens an avenue to design stable and efficient oxide heterojunction photocatalysts derived from dual MOFs.
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