水溶液
化学
催化作用
降级(电信)
核化学
矿化(土壤科学)
化学工程
材料科学
有机化学
氮气
电信
工程类
计算机科学
作者
Nanditta Nandy,Amarnath Pasupathi,Jennifer Arokiaraja,Nagaraj Thirumurugan,K. Suresh,Yugeswaran Subramaniam
标识
DOI:10.1016/j.seppur.2024.127822
摘要
The present study focused on the degradation of antibiotic Chloramphenicol, an emerging contaminant, using submerged thermal plasma technology. Almost 99 % degradation and 82 % mineralization were achieved within 20 min of treatment by Ar/CO2 plasma, generated at 6.2 kW discharge power using a customized thermal plasma torch inside the aqueous solution. Kinetic analysis revealed first-order reaction for Chloramphenicol degradation with a rate constant of 0.257 min−1. Long-lived species, such as H2O2, O3, NO2–, NO3–, and Cl- formed during plasma treatment were quantified. LaMnO3 perovskites nanopowder prepared through a novel thermal plasma route, was introduced as catalyst into the treatment system which enhanced the degradation and mineralization efficiency by 34 % and 17 %, respectively, showing a strong synergetic effect between submerged thermal plasma and catalyst. The energy yield was elevated from 102 mg/kWh to 144 mg/kWh with the addition of catalyst into the submerged thermal plasma treatment system. Liquid Chromatography-mass spectroscopy was used to identify the various degradation intermediates produced during thermal plasma treatment and correspondingly possible degradation pathways were proposed. The antibacterial activity assessment results revealed a significant reduction in the antimicrobial activity of all treated solutions against Gram-positive Bacillus cereus and Gram-negative Pseudomonas aeruginosa bacteria. Additionally, seed germination and growth assessment revealed a reduction in phytotoxicity of the treated solutions. Submerged thermal plasma, combined with the LaMnO3 nanopowder, proved highly effective in treating pharmaceutical contamination in aqueous medium.
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