Effective sonophotocatalytic degradation of tetracycline in water: Optimization, kinetic modeling, and degradation pathways

Ansaf Karim; Grzegorz Boczkaj; Amritanshu Shriwastav

doi:10.1016/j.cep.2024.109979

Effective sonophotocatalytic degradation of tetracycline in water: Optimization, kinetic modeling, and degradation pathways

Abstract

Hybrid advanced oxidation processes (AOPs) are gaining interest in degradation of variety of recalcitrant compounds for water and wastewater treatment, due to possible synergistic effects. The present study systematically evaluated the degradation of tetracycline (TC) with a sonophotocatalytic process combining acoustic cavitation (sonocavitation) and photocatalysis based on N-doped TiO2 catalyst. The TC degradation rate constant was 2.4 × 10−2 min−1, i.e., much higher than individual sonocatalytic (0.5 × 10−2 min−1) and photocatalysis (0.6 × 10−2 min−1) processes at the optimized conditions. The synergy index was 2.14, which reveals a significant improvement in the process performance. Maximum TC degradations of 55.5 ± 1.8 % for photocatalysis, 66.4 ± 1.8 % for sonocatalysis, and 79.5 ± 0.3 % for sonophotocatalysis were observed for 10 mg L−1 initial TC concentration after 90 min of treatment. The photocatalytic experiments were extended further to 210 min to achieve a maximum degradation of 78.9 ± 0.2 % at the optimized condition. Scavenging experiments confirmed that hydroxyl radicals (•OH), electron holes (h+), and superoxide radical anions (O2−•) played a significant role in the degradation of TC. Further, the degradation intermediates for each process were identified and degradation pathways were proposed. Empirical kinetic models based on operational parameters were also developed and validated.

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Authors (3)

Ansaf Karim dr
Grzegorz Boczkaj dr hab. inż.
Amritanshu Shriwastav
- Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai 400 076, India

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Articles

Type:

artykuły w czasopismach

Published in:

CHEMICAL ENGINEERING AND PROCESSING no. 205,
ISSN: 0255-2701

Language:

English

Publication year:

2024

Bibliographic description:

Karim A., Boczkaj G., Shriwastav A.: Effective sonophotocatalytic degradation of tetracycline in water: Optimization, kinetic modeling, and degradation pathways// CHEMICAL ENGINEERING AND PROCESSING -Vol. 205, (2024), s.109979-

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