Enhanced biodecolorization of azo dyes by electropolymerization-immobilized redox mediator.
Enhanced biodecolorization of azo dyes by electropolymerization-immobilized redox mediator.
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DOI：
10.1016/j.jhazmat.2009.02.152
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发表时间：
2009-09
影响因子：
13.6
通讯作者：
Wang Jing;Li Lihua;Zhou Ji-ti;Lu Hong;Liu Guangfei;Jin Ruofei;Yang Fenglin
中科院分区：
文献类型：
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作者：
Wang Jing;Li Lihua;Zhou Ji-ti;Lu Hong;Liu Guangfei;Jin Ruofei;Yang Fenglin
偶氮染料的生物脱色率可以通过添加一些可溶性的奎宁类氧化还原介体来提高，但由于这些介体的顽固性，连续投放会导致二次污染。研究了聚吡咯(PPy)与2，6-二磺酸(AQDS)结合的活性炭毡(ACF)对偶氮染料厌氧生物脱色的影响，并与固定在铂上的AQDS进行了比较。结果表明，在AQDS/PPy/ACF存在下，偶氮染料RR15在最适pH值为7的条件下，8h内脱色率可达80%以上，连续10次重复实验保持稳定。相反，在上述条件下，在AQDS/PPy/铂存在下，RR15的生物脱色率低于60%，并且在第三次生物脱色实验中，AQDS掺杂的PPy从衬底材料铂上脱落。此外，在AQDS/PPy/ACF存在下，5种活性染料、4种酸性染料和2种直接染料的生物脱色效率比没有AQDS时提高了3倍以上。这表明电聚合固定化AQDS(AQDS/PPy/ACF)在加速偶氮染料厌氧生物脱色方面具有潜在的应用前景。
The biodecolorization rate of azo dyes can be improved by the addition of some soluble quinoid redox mediators, but continuous dosing and discharge of these mediators will result in the secondary contamination due to their recalcitrant trait. In this study, the effect of anthraquinone-2,6-disulfonate (AQDS) bound into polypyrrole (PPy) on activated carbon felt (ACF) on anaerobic biodecolorization of azo dyes was investigated and compared with that immobilized on platinum (Pt). The results showed that in the presence of AQDS/PPy/ACF, the biodecolorization efficiency of azo dye RR15 reached over 80% at the optimal pH 7 in 8h and kept stable during successive 10 times repeated experiments. In contrast, in the presence of AQDS/PPy/Pt biodecolorization efficiency of RR15 was less than 60% under the above conditions, and the PPy doped by AQDS desquamated from the substrate material Pt at the third biodecolorization experiment. In addition, in the presence of AQDS/PPy/ACF biodecolorization efficiencies of 5 reactive dyes, 4 acid dyes and 2 direct dyes increased more than 3-fold than that without AQDS. This indicates that electropolymerization-immobilized AQDS (AQDS/PPy/ACF) has potential applications in accelerating the anaerobic biodecolorization of azo dyes.