摘要
建立以Fe@Fe_2O_3/非催化碳毡(NCF)为阴极电极的生物电Fenton(BEF)系统,研究其对微囊藻毒素-LR(MCLR)的去除效果,并对反应机理进行探究。实验采用从培养的铜绿微囊藻中提取得到的MC-LR。结果表明,以80%甲醇作提取剂,采用磁力搅拌技术时,MC-LR的提取效率最高,达到1.066 mg·g-1干藻细胞。BEF系统4 h内能完全降解初始浓度为0.5 mg·L-1的MC-LR。由于MC-LR是极性化合物,BEF系统对MC-LR的吸附很少,主要通过Fenton氧化作用去除。通过液相色谱-质谱联用检测到2种可能的降解产物质荷比m/z 947.8和971.3,推测MC-LR在BEF系统中可能的降解途径主要包括:Mdha上CC—CO键的氧化;酰胺键的水解;Adda上苯环的氧化。
The removal of MC-LR in the bio-electro-Fenton （BEF） system with an Fe@ Fe2O3/non-cata- lyzed carbon felt （NCF） cathode was investigated, along with its degradation mechanism. Microcystis aeruginosa was cultivated for the extraction of MC-LR. Results indicate that using 80% methanol as the extractant under magnetic stirring improves the MC-LR extraction, resulting in an efficiency of 1. 066 mg · g-1 of dry algal cells. In the BEF system, an initial concentration of 0.5 mg · L-1 MC-LR is completely removed within 4 h. Due to the high polarity of MC-LR, its removal is mainly due to Fenton oxidation with minor adsorption. Two feasible products with m/z values of 947.8 and 971.3 were detected with liquid chromatography-mass spectrometry. MC- LR should degrade via the following pathways in the BEF system ： oxidation of C =C-C =O in Mdha, hydroly- sis of amido bonds, then oxidation of benzene in Adda.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期4783-4788,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51309005)
深圳市科技研发资金资助项目(JCYJ20130329180830371)
