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Effect and mechanism analysis of MnO2 on permeable reactive barrier (PRB) system for the removal of tetracycline
Chemosphere ( IF 8.1 ) Pub Date : 2017-11-17 , DOI: 10.1016/j.chemosphere.2017.11.085
Guihua Dong , Lihui Huang , Xueyuan Wu , Chuang Wang , Yangyang Liu , Gaofeng Liu , Lisha Wang , Xiaowei Liu , Haibing Xia

Effect of manganese dioxide (MnO2) on tetracycline (TC) removal/degradation in zero-valent iron (ZVI) based permeable reactive barrier (PRB) system was investigated. To analyze the role of MnO2, three different PRB columns packed with ZVI, ZVI and a layer of MnO2, and MnO2 were set up to investigate the removal effect and reaction mechanism of ZVI coupling with MnO2 on TC removal, respectively. The results show that the removal efficiencies of three PRB columns are 65%, 85%, and 50%, respectively. MnO2 could accelerate the transformation of Fe2+ into Fe3+ and combine with Fe3+ to degrade TC in different reaction sites in the ZVI-MnO2 PRB system. Hydroxyl radicals (·OH) were produced in this process, which contributed to about 58.3% for the TC degradation. The UV–Vis spectrum demonstrated that A ring of TC was the main reaction site for interaction with Fe3+ and the BCD rings were crucial for interactions with MnO2. On the basis of intermediates identified by LC-ESI-MS, the ring structure of TC was opened, and low-molecular-weight compounds were produced in ZVI-MnO2 PRB system.



中文翻译:

MnO 2对可渗透反应屏障(PRB)去除四环素的作用及其机理分析

研究了二氧化锰(MnO 2)对基于零价铁(ZVI)的渗透性反应性阻挡层(PRB)系统中四环素(TC)去除/降解的影响。为了分析MnO 2的作用,建立了三种不同的PRB柱,分别装有ZVI,ZVI和一层MnO 2和MnO 2,以研究ZVI和MnO 2偶联对TC去除的去除效果和反应机理。结果表明,三种PRB色谱柱的去除效率分别为65%,85%和50%。MnO 2可以加速Fe 2+向Fe 3+的转化并与Fe 3+结合在ZVI-MnO 2 PRB系统的不同反应部位降解TC 。在此过程中产生了羟基自由基(·OH),约占TC降解的58.3%。UV-Vis光谱表明,TC的A环是与Fe 3+相互作用的主要反应部位,而BCD环对于与MnO 2的相互作用至关重要。在LC-ESI-MS鉴定的中间体的基础上,TC的环结构被打开,并在ZVI-MnO 2 PRB系统中产生了低分子量化合物。

更新日期:2017-11-19
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