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可见光光催化氧化与生物降解的相互作用研究
Interaction of Visible Light Photocatalytic Oxidation and Biodegradation of Phenol in an Integrated Visible Light Photocatalytic-biological Reactor
【作者】 高航；
【作者基本信息】 吉林大学 ， 环境工程（专业学位）， 2015， 硕士
【摘要】 光催化-生物直接耦合技术自被提出得到广泛关注。本研究在原有的光生直接耦合基础上，采用掺杂上转换发光剂的光催化材料与生物降解直接耦合，实现了光生技术在可见光下降解苯酚，并探究在严峻环境条件下生物所产生的一种自我保护作用。本研究通过制备三种不同的光催化剂用于光催化-生物直接耦合技术中，探究不同的光催化强度带来的光生体系中的差异，通过测试反应体系中生物膜胞外聚合物含量随时间的变化。通过SEM表征微生物在载体的空间分布变化，通过CLSM分析载体上微生物胞外聚合物和活死菌的空间分布变化。从表观与微观两个角度说明微生物的自我保护作用。研究结果表明：光催化-生物直接耦合最终实现苯酚的去除率为90%以上，表明光生的可行性。在光催化-生物直接耦合体系中，生物通过分泌更多的胞外聚合物来保护自身不受外界不良环境的影响，同时SEM和CLSM结果表明微生物在载体上的空间位置迁移也起具有一定的自我保护作用。
【Abstract】 The intimate coupling of photocatalysis and biodegration technology has gotwidespread concern since it were raised. This research base on the original intimatecoupling of photocatalysis and biodegration technology, achieving degration ofphenol within visible light by the use of upconversion luminescence agent dopedphotocatalysist, and explore a self-protective action of microorganisms in harshenvironment.Preparing three kinds of photocatalysts is for intimate coupling of photocatalysisand biodegration technology to explore different photocatalytic intensity in intimatecoupling of photocatalysis and biodegration system, and test extracellular polymericsubstances content changes over time. By SEM characterizes the spatial distributionchanges of the microorganism in carriers. Analysis the distribution changes ofextracellular polymeric substances and the living dead bacteria in carriers by the useof CLSM. We explain the self-protective action of microorganisms from themicrocosmic and macro view.The results showed that: the intimate coupling of photocatalysis and biodegrationtechnology achieves the removal of phenol was above90%, which indicates thefeasibility of intimate coupling of photocatalysis and biodegration. In the intimatecoupling of photocatalysis and biodegration system, microorganism excreted moreextracellular polymeric substances to protect themselves from the impact of adverseexternal environment. While the results of SEM and CLSM showed that spatiallocation migration of microorganisms in the carrier is a kind of self-protection actionof microorganisms, too.