固定化醌耦合生物驱动的芬顿反应对芳香胺的降解

Degradation of aromatic amines via immobilized quinone coupling microbiallydriven Fenton reaction

构建了蒽醌-2-磺酸改性聚氨酯泡沫(AQS-PUF)耦合生物驱动的芬顿反应过程,并研究了其对芳香胺的降解性能。结果表明:芬顿反应所需的H2O2来自于AQS-PUF厌氧生物还原-好氧自氧化循环过程,而Fe2+来自于AQS-PUF介导的柠檬酸铁厌氧生物还原过程;芬顿反应的最适条件为0.20 mmol·L^-1固定化AQS,0.16 g·L^-1生物量,40 mmol·L^-1乳酸钠和4.5 mmol·L^-1柠檬酸铁;在最适条件下,通过厌氧-好氧(21 h/3 h)循环过程产生的H2O2最高可达42.9μmol·L^-1,循环7次后,苯胺和2-氨基-8-N-(4,6-二氯-1,3,5-三嗪-2-基)氨基-1-萘酚-3,6-二磺酸钠的去除率分别为48.6%和43.3%。傅里叶红外光谱分析表明,反应过程中AQS-PUF的结构损伤程度很小,可重复使用。由此可见,AQS-PUF应用在生物驱动的芬顿反应中,不仅降低了对生物产H2O2能力的要求,而且加速了厌氧还原柠檬酸铁过程,从而使AQS-PUF耦合生物驱动的芬顿反应在处理芳香胺类污染物方面具有潜在的应用价值。

Anthraquinone-2-sulfonate sodium-modified polyurethane foam(AQS-PUF)coupling microbiallydriven Fenton reaction was explored to degrade aromatic amines.The results showed that species of H2O2 for Fenton reactions were prepared via anaerobic bioreduction-aerobic autooxidation circles of AQS-PUF,whereas Fe2+was produced through AQS-PUF-mediated anaerobic bioreduction of citrate-Fe.The optimal Fenton reaction conditions were following:0.20 mmol·L^-1 immobilized AQS,0.16 g·L^-1 biomass,40 mmol·L^-1 sodium lactate and 4.5 mmol·L^-1 citrate-Fe.The generated H2O2 reached 42.9μmol·L^-1,and after 7 anaerobic-aerobic cycles,the removal efficiencies of aniline and 2-amino-8-(4,6-dichloro-1,3,5-trianzin-2-ylamino)-1-naphthol-3,6-disulfonate sodium were 48.6% and 43.3%,respectively.Through analysis by Fourier transform infrared spectroscopy,the structure of AQS-PUF was negligibly destroyed and could be recycled.This system of AQSPUF coupling microbially-driven Fenton reaction not only diminished H2O2 requirement generated by bacteria,but also accelerated anaerobic reduction of citrate-Fe,which provides a feasible approach for the treatment of aromatic amine pollutants.