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1、江苏大学硕士学位论文摘要Ti02半导体光催化降解染料废水是一种新兴的治理技术，其具有无毒、廉价、稳定性好、处理效率高等优势。但是目前Ti02光催化技术多以人工紫外光源为主，成本高昂，严重限制其工业化应用。且光催化反应的光照多集聚于溶液表面，光线难以穿透至溶液内部，是污水处理的一大难点。此外，对于Ti02光催化技术的研究也多集中在催化剂的改性、固载等方面，利用光纤介质将溶液外部光照引至内部，则有利于提高光源利用率。因此，探索一条新的道路，对其治理技术的研究具有重要意义。利用不同材质的侧光光纤将可见光引至溶液内部，以增大溶液内部的光强，提高光催化效率。用溶胶凝胶法制备Ag+Ti02和Fe3+Ti0
2、2活性炭粉体光催化剂，用紫外漫反射、x射线衍射(XRD)对其进行表征。XRD图谱显示两种催化剂均为锐钛矿与金红石型混晶，具有高的催化活性。紫外可见漫反射光谱表明利用离子掺杂对Ti02改性进一步拓宽其在可见光区的光谱范围。并用傅里叶红外光谱仪、紫外可见光分光光度计和气相色谱一质谱联用仪对亚甲基蓝染料的光催化过程进行了分杯。探索了亚甲基蓝的降解过程。以亚甲基蓝模拟印染废水，分别探究了Ag+Ti02和Fe3+Ti02活性炭在石英芯侧光光纤和塑料侧光光纤体系下亚甲基蓝的降解效果。考察了催化剂量、光纤数量、光照强度、pH值等因素对亚甲基蓝降解实验的影响。结果表明，在石英芯侧光光纤体系下，选用20 mgL
3、的亚甲基蓝溶液1500 mL，选择Ag+ri02ffcJ催化剂。当催化剂量为1167 gI,，500根侧光光纤，光照强度为1722 lrncm2，pH值约为1122时，光催化降解效果最佳，达到9703，比不加入侧光光纤体系提升近20。同样是石英芯光纤体系，选用Fe3+Ti02活性炭为催化剂，当催化剂量为0333 gL，加入500根侧光光纤，浸没深度为30锄，光照强度为1722 lmcm2，pH值为89，光催化降解效果最佳，最佳效果能达到100。即使是亚甲基蓝溶液初始浓度增加到30 mgL时，其催化降解率也能达到969。当浸没深度增加到1 m时，光照强度降至0934 Iraera2，光催化降解率
4、比浸没30 cnl降低约20。在塑料侧光光纤体系下，选择Ag+Ti02为催化剂，当催化剂量为1167 gL，加入侧光光纤引导可见光降解亚甲基蓝500根塑料侧光光纤，浸没深度为30 cm，光照强度为1498 lmcm2，pH值为1120，其光催化降解效果最佳。催化降解率达到9085，比不加侧光光纤体系提高约10。江苏大学硕士学位论文AbstractTi02 semiconductor photocatalytic oxidation is a novel pollution treating approach todyeing wastewater degradation，whose virtu
5、es are low price，no toxic，chemical stability andhigh treatment efficiencyBut now it is expensive to use artificial UV light in practicesThislimits the application of photocatalytic technology in industryAnd the light of photocatalysisgathered in solution surface，which is difficult to penetrate to th
6、e solutionIt is one of thedifficulties in sewage treatmentIn addition，the research on Ti02 photocatalysis alwaysfocuses on the catalyst modification，immobilization and SO OilBut it is benefit of improvingthe utilization rate of light source by using opticalfiber changing the external light intointer
7、nalsTherefore，it is significance for research of the new technologySOFs were used to increase the intensity of light in solutionAg+Ti02 and Fe3+Ti02Cpowder has been prepared by solgel method，and characterized by ultraviolet visiblespectroscopy of solid diffuse reflectance(UVVis DRS)，X-ray diffractio
8、n(XRD)XRDpatterns show that the two catalysts are the mixed crystal of anatase and rutile Ti02UVVisDRS show that it could broaden absorbing visible light range by doping ag+or Fe3+iron inTi02And the photocatalytic reaction of methylene blue(MB)Was analyzed by usingUV-Visible，Fourier Transform Infrar
9、ed Spectroscopy(FHR)and Gas Chromatography andMass Spectroscopy(GCMS)And the mechanism was exploredMB was chosen as goal degradantThe MB degradation efficiency of adding Ag+Ti02 orFe3+Ti02C in solution under the visible light irradiation Was evaluatedThe sideglowingoptical fibers(SOFs)systems were q
10、uartz core and plastic SOFsThe author investigateddifferent reaction conditions between quartz core and plastic SOFs systemThe impact factorsinclude the dosage of catalyst，quantity of optical fiber,illumination intensity，and pH and SOonThe results show that，under the system of quartz core SOF，the MB
11、 was degradedeffectively to 9703by within 8 h under the conditions that the dosage of Ag+Ti02 was1167 gL，initial concentration of MB was 20 m扎the quality of SOFs was 500，pH was1 122 light intensity was 1722 lmcm2 and submergence was 30 cmCompared with no fiberIII侧光光纤引导可见光降解亚甲基蓝system the degradation
12、 efficiency nearly increased 20And in the same system，the MB wasdegraded effectively to 100by within 5 h under the conditions that the dosage ofFej+Ti02C was 0333 gL，initial concentration of MB Was 20 m比the quality of SOFs wag500，pH was 89 and light intensity was 1722 lmcm2Even the initial concentra
13、tion of MBwas30 meL,the degradation efficiency could attach 969When submergence was 1 m，theefficiency dropped about 20compared with the 30 cnlWhile under the system of plasticSOF，the MB Was degraded effectively to 9085by within 8 h under the conditions that thedosage of Ag+Ti02 was 1167比initial conc
14、entration of MB was 20 mL，the quality ofSOFs was 500，pH was 1 120 and light intensity was 1498 lrrdcrn2Compared with no fibersystem the degradation efficiency nearly increased 10Keywords：Methylene Blue，photocatalytic degradation，Ag+Ti02，Fe3+Ti02C，sideglowingoptical fiber江苏大学硕士学位论文目 录第一章引 言11概j2罡112 Ti02光催化氧化技术113 Ti02光催化氧化基本原理214影响光催化反应的因素3141催化剂的晶型。3142光源类别4143光照强度4144光催化剂投加量。5145溶液初始浓度5146溶液pH值5147外加氧化剂的影响515光纤。6151侧光光纤的特性6152塑料光纤7153光纤的应用816染料废水降解的研究进展817选题目的与研究内容
