Photocatalytic degradation of the acetaminophen by nanocrystal-engineered TiO<sub>2</sub> thin film in batch and continuous system

doi:10.1007/s11783-020-1319-9

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (2) : 27 https://doi.org/10.1007/s11783-020-1319-9

SHORT COMMUNICATION

Photocatalytic degradation of the acetaminophen by nanocrystal-engineered TiO₂ thin film in batch and continuous system

Reza Katal¹, Mohammad Tanhaei², Jiangyong Hu¹(

)

¹. Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore
². Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, Singapore 138634, Singapore

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Abstract

• Photocatalytic activity was improved in TiO₂ thin film by rapid thermal annealing.

• Photoreactor was designed for TiO₂ thin film.

• Considerable reusability and durability of prepared photocatalysts were studied.

Un-biodegradable pharmaceuticals are one of the major growing threats in the wastewaters. In the current study, TiO₂ thin film photocatalysts were designed by nanocrystal engineering and fabricated for degradation of the acetaminophen (ACE) in a photocatalytic reaction under UV light irradiation in batch and continuous systems. The photocatalyst was prepared by sputtering and then engineered by thermal treatment (annealing at 300℃ (T300) and 650℃ (T650)). The annealing effects on the crystallinity and photocatalytic activity of the TiO₂ film were completely studied; it was found that annealing at higher temperatures increases the surface roughness and grain size which are favorable for photocatalytic activity due to the reduction in the recombination rate of photo-generated electron-hole pairs. For the continuous system, a flat plate reactor (FPR) was designed and manufactured. The photocatalytic performance was decreased with the increase of flow rate because the higher flow rate caused to form the thicker film of the liquid in the reactor and reduced the UV light received by photocatalyst. The reusability and durability of the samples after 6 h of photocatalytic reaction showed promising performance for the T650 sample (annealed samples in higher temperatures).

Keywords Acetaminophen TiO₂ Thin film Batch Continuous

Corresponding Author(s): Jiangyong Hu

Issue Date: 01 September 2020

Cite this article:

Reza Katal,Mohammad Tanhaei,Jiangyong Hu. Photocatalytic degradation of the acetaminophen by nanocrystal-engineered TiO₂ thin film in batch and continuous system[J]. Front. Environ. Sci. Eng., 2021, 15(2): 27.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1319-9
https://academic.hep.com.cn/fese/EN/Y2021/V15/I2/27

Fig.1 X-ray diffraction spectra for as-deposited TiO₂ film. T300 (deposited and annealed at 300℃) and T650 (deposited and annealed at 650℃).

Fig.2 The concentration of the ACE during the photocatalytic reaction and k_app (min⁻¹) of the TiO₂ samples.

Fig.3 ACE concentration in FPR with different flowrates under UV light irradiation.

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