Synergistic degradation of bisphenol A by pulsed discharge plasma with granular activated carbon: Effect of operating parameters, synergistic mechanism and possible degradation pathway
Synergistic degradation of bisphenol A by pulsed discharge plasma with granular activated carbon: Effect of operating parameters, synergistic mechanism and possible degradation pathway
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脉冲放电等离子体与颗粒活性炭协同降解双酚A：操作参数的影响、协同机制和可能的降解途径
DOI：
10.1016/j.vacuum.2018.07.044
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发表时间：
2018-10-01
期刊：
影响因子：
4
通讯作者：
Wu, Yan
中科院分区：
文献类型：
--
作者：
Guo, He;Jiang, Nan;Wu, Yan
建立了气液混合脉冲放电等离子体（PDP）与颗粒活性炭（GAC）联合降解双酚A（BPA）的实验装置。结果表明，PDP与GAC复合体系对BPA的降解具有良好的协同效应。活性炭投加量为4g、BPA浓度为20 mg/L、酸性溶液条件和较高的气体流量有利于BPA的降解，最高BPA去除率、矿化率和动力学常数分别可达98.7%、34.6%和0.075min（-1）。添加活性炭后，水中O-3的减少和中心点OH的增加说明活性炭可以催化O-3的生成，并导致中心点OH的形成。自由基清除剂测试说明了中心点OH在BPA降解过程中的作用。通过三维激发发射荧光光谱研究了双酚A降解过程中荧光团的性质和浓度的变化。脉冲放电降解SPA过程中会产生甲酸、乙酸、草酸等有机酸和硝酸、亚硝酸等无机酸。利用液相色谱-质谱联用仪（LC-MS）对BPA降解过程中的中间产物进行了鉴定。基于中间体，提出了拟定的降解途径。扫描电子显微镜技术表明，活性炭可以通过放电过程再生。
A hybrid gas-liquid pulsed discharge plasma (PDP) system combined with granular activated carbon (GAC) was established to investigate the bisphenol A (BPA) degradation. The results exhibit excellent synergistic effect in PDP with GAC system (combination system) for BPA degradation. 4 g amount of GAC, 20 mg/L BPA concentration, acidic solution condition and higher gas flow rate are beneficial for BPA degradation; The highest BPA removal efficiency, mineralization and kinetics constants can reach 98.7%, 34.6% and 0.075 min(-1) respectively. The decreased O-3 and enhanced center dot OH in water after GAC addition illustrate O-3 can be catalyzed by GAC and lead to the formation of center dot OH. The radical scavenger test illustrates the role of center dot OH during BPA degradation. The aviation of nature and concentration of fluorophores during BPA degradation is explored by three-dimensional excitation emission fluorescence spectra. Organic acids including formic acid, acetic acids, oxalic acid and inorganic acid including nitric acid and nitrous acid can be produced during pulsed discharge and SPA degradation. The intermediates during the BPA degradation were identified by liquid chromatograph-mass spectrometer (LC-MS). Based on the intermediates, the proposed degradation pathway is presented. The SEM technology demonstrates that GAC can be regenerated by the discharge process.