Clean Water and Sanitation (SDG 6), Climate Action (SDG 13)
Plasma activation of peroxymonosulfate in presence of microbubble for degradation of glucocorticoids in water Andere C. Miruka 1* , Xiaoting Gao 2 , Li Cai 2 , Yinyin Zhang 2 , Pengcheng Luo 2 , Geoffrey Otieno 1 , Han Zhang 2 , Zhiqi Song 2 , Yanan Liu 2,3 1 School of Chemistry and Material Science, Technical University of Kenya, Nairobi 52428- 00200, Kenya. 2 College of Environmental Science and Engineering, Donghua University, Shanghai, China. 3 Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. * Corresponding author: E-mail: andere.miruka@tukenya.ac.ke The degradation mechanisms of glucocorticoids (GCs) in water using dielectric barrier discharge (DBD) plasma was analysed by monitoring peroxymonosulfate (PMS) activation effect in the presence of microbubbles (MB) [1] . At neutral pH and ambient temperature, hydrocortisone (HC), betamethasone (BT) and fluocinolone acetonide (FA) were degraded effectively by the DBD/MB/PMS system. The 90-min degradation efficiencies of 77%, 80% and 82%, for HC, BT and FA, respectively, were achieved (discharge power: 83.5 W; PMS:GC concentration: 20:1). In comparison, the 90-min degradation efficiencies for HC, BT and FA by DBD/MB system (discharge power: 83.5 W, pH unadjusted, flow rate 40 mg/L) were only 49%, 54% and 60% respectively [2] . The pseudo-first order for GC degradation increased with the increase in PMS concentration and initial solution pH. This work not only proves of the ability of plasma activation of PMS but also highlights the synergistic effect among plasma, MB and PMS in water decontamination [3] . Key words: Plasma, Peroxymonsulfate, Microbubble, Glucocorticoids, Degradation References 1. M. Takahashi, K. Chiba and P. Li, Free-Radical Generation from Collapsing Microbubbles in the Absence of a Dynamic Stimulus, The Journal of Physical Chemistry B 111 (2007) 1343-1347 2. M. Qasim, M.S. Rafique and R. Naz, Water purification by ozone generator employing non-thermal plasma, Materials Chemistry and Physics 291 (2022) 126442 3. A. Yusuf, H.K. Amusa, J.O. Eniola, A. Giwa, O. Pikuda, A. Dindi, et al., Hazardous and emerging contaminants removal from water by plasma-based treatment: A review of recent advances, Chemical Engineering Journal Advances 14 (2023) 100443
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