蒽醌-2-磺酸盐强化电辅助微生物体系对偶氮染料的脱色效果  

Enhanced Decolorization of Azo Dye in Electro-Assisted Microbial System by Anthraquinone-2-Sulfonate (AQS)

作　　者：张明慧[1] 曹占平[1] 李松松[1] 

机构地区：[1]天津工业大学环境与化学工程学院,天津300387

出　　处：《环境科学研究》2017年第3期471-477,共7页Research of Environmental Sciences

基　　金：国家自然科学基金项目(51078265)

摘　　要：为了提高微生物对偶氮染料的降解效率,将电辅助引入微生物还原降解过程,对比研究了EAMS(电辅助微生物体系)、ECS(电化学体系)和MS(微生物体系)对偶氮染料活性艳红X-3B的降解效果,并考察了不同摩尔浓度的AQS(蒽醌-2-磺酸盐)对电微生物体系降解染料的强化作用.结果表明:反应24 h时,EAMS对活性艳红X-3B的去除率达到99.8%,比MS(去除率为61.9%)和ECS(去除率为27.1%)二者之和还要大10.8%;EAMS对活性艳红X-3B的降解过程符合一级反应动力学特征.当c(AQS)为0.050 mmol/L时,降解最快,一级动力学常数为1.962 h^(-1),是未添加AQS(0.264 4 h^(-1))的7.42倍.加入AQS后,体系中电流升高,说明AQS加快了降解过程中电子传递速率.研究显示,AQS的加入实现了电极-远离电极的微生物-染料之间多相反应界面远程电子传递过程,使整个体系的微生物都可以快速发挥作用,达到强化降解偶氮染料.In order to improve the biodegradation efficiency of azo dye,electro-assist was introduced to the process of microbial reduction.The degradation rate of azo dye reactive brilliant red X-3B in an electro-assisted microbial system（EAMS） was studied compared with that in an electro-chemical system（ECS） and a microbial system（MS）. The accelerating effects of redox mediator anthraquinone-2-sulfonate（AQS） on degradation of dyes were studied in EAMS. The results indicated that the degradation rate of azo dye in EAMS was 99. 8%within 24 h,which was 10. 8% higher than the sum of degradation in ECS（61. 9%） and in MS（27. 1%）. The decolorization process of reactive brilliant red X-3B with time followed first-order kinetics in EAMS. Dye degradation was fastest when the concentration of AQS was0. 050 mmol/L. The first-order kinetic constant was 1. 962,which was 7. 42 times that without AQS（0. 2644 h^-1）. The current of the system rose after adding AQS,which demonstrated that AQS promoted the speed of electrons transferring in the degradation process. The long-range electron transfer processes of the multiphase interface between electrode,microorganism away from electrode and pollutants were implemented after adding AQS. The process made microorganism of the whole system work quickly,which strengthened the degradation of azo dyes.

关 键 词：电辅助微生物 活性艳红X-3B 反应动力学 蒽醌-2-磺酸盐 远程电子传递 

分 类 号：X703.1[环境科学与工程—环境工程]