摘要
为提高光催化反应中光生电子与空穴的分离效率,提出了微生物燃料电池产电辅助转盘式双极液膜光催化降解染料废水的方法。以苋菜红为目标污染物配制模拟染料废水,利用微生物燃料电池产电作为转盘液膜光催化反应器的外加电场,以期提高液膜光催化对染料废水的降解效率。通过考察微生物燃料电池组连接方式、转盘转速、废水初始浓度、pH值以及电解质浓度等因素,优化了光催化降解反应条件,并通过对降解中间产物的测定初步推测了苋菜红的光催化降解机制。结果表明,2组燃料电池串联可有效提高光催化降解效率,在转速为90 r/min、pH值为4.40、废水初始浓度不高于40 mg/L条件下可以实现理想的脱色率和脱色量;溶液电导率的增加对降解效果有抑制作用;MFC辅助光催化反应主要通过破坏染料分子中的偶氮共轭发色体系实现脱色,可对降解中间产物起到一定的矿化作用。
In this study,we proposed a method that microbial fuel cells assist dual-rotating disk thin-film photocatalytic reactor for dye wastewater degradation to improve the separation efficiency of photoelectron and hole generated by photocatalysis reaction.Taking amaranth as target pollutant to prepare simulating dye wastewater,microbial fuel cells were utilized as external electric field of the photocatalytic reactor to improve dye wastewater degradation efficiency by thin-film photocatalysis.The photocatalytic degradation reaction conditions were optimized by investigating single factor including microbial fuel cells connection patterns,rotating speed,dye wastewater initial concentration,pH value and electrolyte concentration.The photocatalytic degradation mechanism of amaranth was initially proposed by detecting degradation byproducts using UV-vis spectrum.The results showed two series connected MFCs can effectively enhance photocatalytic efficiency.Desirable decolorization efficiency and color removal quantity were obtained under rotating speed of 90 r/min,pH value of 4.40,and initial amaranth concentration less than 40 mg/L.Increasing of solution conductivity showed inhibition effect on degradation efficiency.MFC assisting photocatalytic reaction mainly achieves decolorization by destroying azo conjugate chromogenic system in dye molecules,and has certain mineralization effect on intermediate products.
作者
李珏秀
刘纪林
杨草原
刘金茗
马毅豪
王夷楠
LI Juexiu;LIU Jilin;YANG Caoyuan;LIU Jinming;MA Yihao;WANG Yinan(School of Energy and Environment,Zhongyuan University of Technology,Zhengzhou 450007,China)
出处
《中原工学院学报》
CAS
2022年第2期51-57,共7页
Journal of Zhongyuan University of Technology
基金
国家大学生创新训练项目(202110465019)
河南省重点研发与推广专项(科技攻关)(212102310506)
中原工学院自然科学基金(K2022QN027)
中原工学院研究生教育质量提升项目(JG202217)。
关键词
微生物燃料电池
光催化
液膜
苋菜红
降解
microbial fuel cell
photocatalysis
aqueous thin-film
amaranth
degradation
