TiO2/SiO2光催化剂制备及对偶氮染降解的研究

以多孔硅胶为基质，钛酸四丁酯和环已烷为源，通过浸渍的方法，合成了表面键联型TiO2／SiO2光催化剂，通过Zeta电位、BET和粒度分析、XRD分析、FUR分析，确定氧化钛是通过Ti-O-Si键的联结负载在多孔硅胶表面上。探讨了催化降解条件的变化对降解活性艳红X-3B；活性亮橙K—R和阳离子红CIR-22的影响，最后确定了TiO2／SiO2催化降解偶氮染料的最佳工艺条件。     

偶氮染料对小球藻的毒性研究

本文研究了偶氮染料对藻类生长及若干生理代谢过程的影响。 实验结果表明,偶氮染料对藻的生长速率及生物量均有一定的影响。与藻的叶绿素合成相比,藻的光合放氧对偶氮染料较敏感。偶氮染料能抑制藻的ATP酶活性,其原因之一可能与偶氮染料与ATP的相互作用有关。 统计分析结果表明,藻对偶氮染料具较强的耐受性,这就为实际工作中利用藻类净化印染废水提供了保证。      

Hydroxyl radical concentration profile in photo-Fenton oxidation process: generation and consumption of hydroxyl radicals during the discoloration of azo-dye Orange II

Dynamic behaviors of hydroxyl (OH) radical generation and consumption in photo-Fenton oxidation process were investigated by measuring OH radical concentration during the discoloration of azo-dye Orange II. The effects of operating parameters for photo-Fenton discoloration, i.e. dosages of H₂O₂ and Fe, initial dye concentration, solution pH and UV irradiation, on the generation and consumption of OH radicals playing the main role in advanced oxidation processes were extensively studied. The scavenger probe or trapping technique in which coumarin is scavenger of OH radical was applied to estimate OH radical concentration in the photoreactor during the photo-Fenton discoloration process. The OH radical generation was enhanced with increasing the dosages of Fenton regents, H₂O₂ and Fe. At the initial stage of photo-Fenton discoloration of Orange II, the OH radical concentration rapidly increased (Phase-I) and the OH radical concentration decreased after reaching of OH radical concentration at maximum value (Phase-II). The decrease in OH radical concentration started when the complete discoloration of Orange II was nearly achieved and the H₂O₂ concentration became rather low. The dynamic behavior of OH radical concentration during the discoloration of Orange II was found to be strongly linked with the change in H₂O₂ concentration. The generation of OH radical was maximum at solution pH of 3.0 and decreased with an increase of solution pH. The OH radical generation rate in the Fenton Process was rather slower than that in the photo-Fenton process.     

藻菌系统对偶氮染料降解作用的研究

研究了藻菌系统对偶氮染料降解的可能性,机理和环境条件的影响,49种不同类型的偶氮染料降解试验表明,藻菌对染料有较好的降解作用.发现藻类也能直接参与染料的降解,动摇了藻类在稳定塘有机物降解过程中仅能为好氧菌供氧的传统观念.根据典型染料实验研究表明,该系统降解偶氮染料的机理是:染料先被藻菌降解成芳香胺.尔后芳香胺在有氧条件下进一步降解成无机物;在无氧条件下,芳香胺降解受阻。环境条件试验表明,在相当广的pH值、温度、光强和碳源营养水平条件下,该系统仍有较高的降解效果。