Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University. Chongqing, People's Republic of China.
Chongqing Rong tong Lv yuan Environmental Protection Company limited, Chongqing, People's Republic of China.
Environ Technol. 2022 Sep;43(23):3580-3590. doi: 10.1080/09593330.2021.1928292. Epub 2021 May 21.
Recently, the micro-nano bubble (MB) technology has attracted people's attention due to its special advantages. Here, we carried out the technology of combining MB and hydrogen peroxide (MB/HO) to achieve efficient degradation of tetracycline wastewater. The effect of MB/HO technology on the degradation efficiency of tetracycline was deeply analysed by investigating the reaction time, HO dosage, pH and MB inlet flow. The results showed that the degradation rate of tetracycline hydrochloride by MB/HO technology can reach 92.43%, which is 9.44 and 3.94 times that of MB and HO alone. Through electron spin resonance (ESR) analysis and free radical quenching experiments, a possible mechanism for MB/HO technology to efficiently degrade TC was proposed. In the MB/HO system, the high temperature and high pressure environment generated when MB ruptures can activate HO to obtain a higher number of active oxygen species. •OH is the main reactive oxygen radical in the process of MB/HO degradation of TC, followed by HO•/•O-. In addition, the possible intermediate products of the oxidation TC process were identified by HPLC-MS technology. Under the action of •OH and HO•/•O- free radicals, TC molecules undergo demethylation and hydroxylation, ring-opening reactions, isomerization, deethylation, deacylation, deamination and dehydration reactions to generate intermediate products and finally convert them into CO and HO. The development of MB/HO technology can potentially be used to efficiently remove TC substances in the water environment and provide a new method for water purification.
最近，由于其特殊优势，微纳米气泡（MB）技术引起了人们的关注。在这里，我们结合 MB 和过氧化氢（MB/HO）技术，实现了四环素废水的高效降解。通过考察反应时间、HO 用量、pH 值和 MB 入口流量，深入分析了 MB/HO 技术对四环素降解效率的影响。结果表明，MB/HO 技术对盐酸四环素的降解率可达 92.43%，分别是 MB 和 HO 单独作用的 9.44 倍和 3.94 倍。通过电子顺磁共振（ESR）分析和自由基猝灭实验，提出了 MB/HO 技术高效降解 TC 的可能机制。在 MB/HO 体系中，MB 破裂时产生的高温高压环境可以激活 HO，从而获得更多的活性氧物质。在 MB/HO 降解 TC 的过程中，•OH 是主要的反应性氧自由基，其次是 HO•/•O-。此外，还通过 HPLC-MS 技术鉴定了氧化 TC 过程中的可能中间产物。在•OH 和 HO•/•O-自由基的作用下，TC 分子经历脱甲基化和羟化、开环反应、异构化、去乙基化、去酰化、去氨化和脱水反应，生成中间产物，最终转化为 CO 和 HO。MB/HO 技术的发展有望高效去除水环境中的 TC 物质，为水净化提供新方法。
