# Enhanced Visible-Light Absorption of Fe2O3Covered by Activated Carbon for Multifunctional Purposes: Tuning the Structural, Electronic, Optical, and Magnetic Properties
> Tahir D.

URL kanonis: https://discover.unhas.ac.id/publications/enhanced-visible-light-absorption-of-fe2o3covered-by-activated-carbon-for-multif
Jurnal / Konferensi: ACS Omega
Tahun terbit: 2021
DOI: https://doi.org/10.1021/acsomega.1c04526
ISSN: 24701343
Kuartil SJR: Q1
Citations: 47

## Authors
- Tahir D.

## Abstract
Visible-light absorption is a critical factor for photocatalyst activity and absorption of electromagnetic (EM) interference application. The band gap of Fe<sub>2</sub>O<sub>3</sub> is 2 eV, which can be increased by doping with a high-band-gap material such as carbon from activated carbon (AC) with a band gap of 4.5 eV for increased visible-light absorption. The porosity decreases from 88 to 81.6%, and the band gap increases from 2.14 to 2.64 eV by increasing the AC from 10 to 25%, respectively. The photocatalytic activity takes 120 min to produce a harmless product for 10-20% AC, but 25% AC shows 89.5% degradation in only 90 min and the potential to attenuate the EM wave up to 99% due to the RL being below -20 dB. The second- and third-cycle degradation achieved by the composite Fe<sub>2</sub>O<sub>3</sub>-AC having 25% AC is 88.2 and 86.5% in 90 min, respectively. The pore of the surface state of AC contains a trapped charge, and interaction occurs between the charge (electron/hole) and O<sub>2</sub> or H<sub>2</sub>O to produce OH and superoxide (O<sub>2</sub> <sup>-</sup>) radicals. These radicals move inside the molecule of the pollutant (methylene blue (MB)) to break up the bond, with the final products being H<sub>2</sub>O and CO<sub>2</sub>. The X-ray photoelectron (XPS) spectra show that oxygen plays a key role in the interatomic bonding with Fe, C, and MB atoms. The best absorption of EM interference is -21.43 dB, with degradation reaching 89.51% in only 90 min for 25% AC due to its higher band gap and anisotropy constant. Fe<sub>2</sub>O<sub>3</sub>-carbon is a multifunctional material for the green environment because of its electromagnetic interference absorption and photodegradation of wastewater.

## Keywords
- Visible spectrum
- Absorption (acoustics)
- Materials science
- Optoelectronics
- Band gap
- Carbon fibers
- Interference (communication)
- Photocatalysis
- Optics
- Chemistry
- Physics
- Telecommunications
- Composite number
- Composite material
- Catalysis
- Computer science
- Biochemistry
- Channel (broadcasting)

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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