电聚合固定化介体催化强化2,6-二硝基甲苯生物还原

难生物降解的水溶性氧化还原介体会随出水而流失,造成二次污染.采用活性炭毡(ACF)电极上电聚合吡咯单体掺杂蒽醌二磺酸盐技术制备的固定化氧化还原介体,AQDS/PPy/ACF,考察了其作为一种新型固态介体催化2,6-二硝基甲苯(2,6-DNT)生物还原的可行性.结果表明,基体材料对聚吡咯复合材料的表面形貌特性影响很大,在铂片上形成的聚吡咯呈菜花状,而在ACF上则呈现微球状;AQDS/PPy/ACF对2,6-DNT具有较强的生物催化活性和催化稳定性;它的加入可使2,6-DNT的生物还原速率提高近4倍,一级降解动力学常数达到0.0345h-1;在该反应体系中,2,6-DNT首先被还原为中间产物2-氨基-6-硝基甲苯(2-A-6-NT),后者再被还原为终产物2,6-二氨基甲苯(2,6-DAT).

Enhanced biological reduction of 2,6-dinitrotoluene by catalysis of electropolymerization-immobilized redox mediators

The continuous dosing and discharge of water-soluble redox mediators,such as biologically recalcitrant compounds,will result in the secondary contamination.The immobilized redox mediator prepared by incorporation of anthraquinonedisulphonate(AQDS) during the electropolymerization of pyrrole monomer on active carbon felt(ACF) electrode,AQDS/PPy/ACF,was used for catalyzing anaerobic biotransformation of 2,6-dinitrotoluene(2,6-DNT) .The results show that the morphology of the PPy film largely depends on the su...