【作者】 房献宝；

【导师】 李明玉；

【作者基本信息】 暨南大学 ， 环境工程， 2007， 硕士

【摘要】 本文以热氧化法制备的TiO₂/Ti薄膜电极为阳极、石墨电极为阴极和饱和甘汞电极为参比电极，设计了一种新型的两槽光电化学催化反应器。在该反应器中，染料废水在阳极槽被TiO₂/Ti薄膜催化氧化降解；同时，利用石墨还原溶解氧产生的H₂O₂与UV构成H₂O₂/UV体系，使阴极槽中的染料废水得到降解。H₂O₂是构成H₂O₂/UV体系的关键因素，因此在处理印染废水之前，本文探寻了阴极产生H₂O₂的较佳条件。考察了溶液初始pH、阴极电位、反应时间、鼓空气、搅拌、支持电解质浓度、槽电压等因素对过氧化氢产量的影响。在上述实验基础上，本文对模拟染料废水活性艳红X-3B进行了降解脱色研究，首先对比研究了不同体系（光照、电解、光催化、光电催化）的处理效果。结果表明，阴极槽中光电联合氧化X-3B溶液的脱色效果比光照、电解单独作用的效果好；阳极槽中X-3B溶液的脱色效果有一定的光电催化协同作用。然后本文研究了在光电化学催化体系下，阴极槽溶液初始pH、阴极电位、反应时间、溶液初始浓度等因素对X-3B溶液氧化效果的影响。结果表明，阴极槽中X-3B溶液在酸性和碱性条件下的脱色率比中性条件下的脱色率好，最佳溶液初始pH为3.0；脱色率并非随阴极电位E_c的降低而一直增加，最佳的阴极电位值E_c=-0.6V；脱色率随初始浓度的增加而降低。在支持电解质硫酸钠浓度为0.02mol·L^-1、阴极槽溶液初始pH=3、阳极槽溶液初始pH=6.5、阴极电位E_c=-0.6V和反应时间为80min的条件下，对30mg·L^-1活性艳红X-3B溶液进行光电化学催化降解脱色处理，阴阳两极槽X-3B溶液的脱色率分别达到99.3％和88.7％。与仅有TiO₂/Ti薄膜阳极对X-3B进行降解的双极单效光电催化反应器相比，该新型反应器对X-3B的催化降解效率显著提高，阴阳两槽对X-3B溶液都具有较高的降解脱色效果，达到了双极双效。最后，为了研究该光电化学催化反应器对其它染料降解的可行性，本文又分别对酸性大红3R、直接耐晒黑、碱性品红三种染料进行了降解脱色实验。结果表明，该反应器对这几种染料溶液均具有较好的降解脱色效果。更多还原

【Abstract】 A new two-compartment photo-electro-chemical catalytic reactor was designed, in which thermally formed TiO₂/Ti was used as anodes, graphite as cathode and a saturated calomel electrode as the reference electrode. In this reactor, dye wastewater was degraded with TiO₂/Ti electrode in anodic compartment; simultaneously, hydrogen peroxide produced by graphite electrode reducing dissolved oxygen and UV structured the H₂O₂/UV system, and dye wastewater was also degraded in cathodic compartment.H₂O₂ is the crucial element of the H₂O₂/UV system. The favorable condition of obtaining H₂O₂ was investigated before treating dye wastewater firstly. The initial pH of solution, cathodic potential, reactive time, aeration, stirring, the concentration of electrolyte, cell voltage and so on factors which affect H₂O₂ output were studied.Based on above experiments the treating of reactive red X-3B was performed. Firstly, the effect of photolysis, electrolysis, photocatalysis and photoelectrocatalysis on the reactive red X-3B were compared.The results showed that the decolorizing rate of photoelectrooxidation was higher than those of direct photolysis and electrolysis in cathodic compartment; the synergetic effect of the photoelectrocatalysis was obtained in anodic compartment.Then, the influence of the initial pH of solution, cathodic potential, reactive time and the initial concentration of solution on the reactive red X-3B oxidation were analyzed in photo-electro-chemical catalytic system. Results showed that the decolorizing rate of the reactive brilliant red X-3B solution got down to the lowest in neutral pH solution and increased at both acid and basic pH range, and the optimum pH was 3.0; the decolorizing rates didn’t always increase with the decreasing of the cathodic potential（E_c）, the optimum E_c was-0.6V; the decolorizing rates decreased with the increasing of the initial concentration of solution. Under the conditions of the supporting electrolyte concentration was 0.02mol·L^-1, initial solution pH=3.0 in cathodic compartment and pH=6.5 in anodic compartment, cathodic potential E_c=-0.6V, the reaction time was 80min, the highest decolorizing rate of 99.3% was obtained in cathodic compartment, and 88.7% in anodic compartment when the initial concentration of reactive red X-3B dye was 30mg·L^-1.Compared with the"two electrodes and single effect"reactor only having photoelectrocatalysis with TiO₂/Ti anodic electrode, the new reactor has obviously enhanced the degradation of the reactive red X-3B and achieved the purpose of"two electrodes and double effects". In the end, in order to study feasibility of the reactor, the experiments had chosen some dyes such as acid scarlet 3R、direct fast black and fuchsin basic to degrade. The results showed that the new type of reactor had preferable catalytic degradation effects on these dyes.更多还原