微波诱导催化氧化降解甲基橙

发布时间：2018-10-10 18:35

【摘要】：微波诱导催化氧化技术处理难降解的有机废水具有反应快速、降解程度高、不产生二次污染物等优点。本文围绕微波诱导催化氧化这一关键技术,分别采用活性炭、Fe-、Fe2O3/AC和Fe2O3/GC作为催化剂,对甲基橙模拟废水进行处理,研究各主要工艺参数对染料废水降解效率的影响,并对微波协同催化剂处理废水的机理进行了探究。对微波诱导催化氧化降解甲基橙的影响因素进行研究。结果表明,甲基橙的降解率随微波功率增大、微波辐照时间增加和催化剂的用量增加而增大；酸性条件下有利于甲基橙的降解。针对微波-活性炭体系,紫外可见光谱(UV-vis),红外光谱(IR),扫描电镜(SEM)分析降解过程。结果表明,吸附降解反应后,大量的中间产物残留在活性炭表面,使其重复使用的性能能降低。进行微波辐照再生活性炭,结果表明,微波辐照能有效的再生活性炭,6个反应周期后活性仍可达原活性的74.1%。针对微波-Fe-B体系,考察了不同处理方法对甲基橙降解性能的影响。结果表明,在微波诱导作用下,Fe-B催化剂对甲基橙的降解效果显著。使用X射线衍射(XRD)和SEM,对催化剂进行了表征。结果表明,Fe-B催化剂在经过降解反应后,Fe-B转化为γ-Fe2O3。UV-vis和IR分析表明,Fe-B催化剂对甲基橙有吸附和降解的双重功效。针对微波-碳载铁体系,XRD、SEM和X射线能谱(EDS)分析表明,非晶态球形氧化铁颗粒团聚负载于活性炭表面；球形α-Fe2O3颗粒负载于石墨碳表面。考察了不同处理方法对甲基橙降解性能的影响。结果表明,在微波诱导作用下,类Fenton法对甲基橙的降解效果显著。UV-vis和IR分析表明,催化剂对甲基橙有吸附和降解的双重功效；微波能直接促使H2O2产生·OH降解甲基橙；微波的热效应促进了整个体系的反应进行。
[Abstract]:Microwave induced catalytic oxidation has the advantages of rapid reaction, high degree of degradation and no secondary pollutants. Around the key technology of microwave induced catalytic oxidation, activated carbon, Fe-,Fe2O3/AC and Fe2O3/GC were used as catalysts to treat methyl orange simulated wastewater, and the effects of main process parameters on the degradation efficiency of dye wastewater were studied. The mechanism of microwave synergistic catalyst for wastewater treatment was also discussed. The factors affecting the degradation of methyl orange by microwave induced catalytic oxidation were studied. The results show that the degradation rate of methyl orange increases with the increase of microwave power, microwave irradiation time and the amount of catalyst, and is favorable to the degradation of methyl orange under acidic conditions. The degradation process was analyzed by UV-vis (UV-vis) and infrared (IR) (IR), scanning electron microscope (SEM) for microwave-activated carbon system. The results showed that after adsorption and degradation, a large number of intermediate products remained on the surface of activated carbon, which reduced its reusing performance. The activated carbon was regenerated by microwave irradiation. The results showed that microwave irradiation could effectively regenerate activated carbon, and the activity of activated carbon could still reach 74.1% of the original activity after six reaction cycles. The effects of different treatment methods on the degradation of methyl orange were investigated for microwave-Fe-B system. The results showed that the degradation of methyl orange by Fe-B catalyst was remarkable under microwave induction. The catalyst was characterized by X-ray diffraction (XRD) and SEM,. The results showed that after the degradation of Fe-B catalyst, Fe-B was transformed into 纬-Fe2O3.UV-vis and IR. The results showed that Fe-B catalyst had the dual function of adsorption and degradation of methyl orange. For microwave-carbon-supported iron system, XRD,SEM and X-ray (EDS) analysis show that amorphous spherical iron oxide particles are agglomerated on the surface of activated carbon, and spherical 伪-Fe2O3 particles are loaded on graphite carbon surface. The effects of different treatment methods on the degradation of methyl orange were investigated. The results showed that the degradation of methyl orange by Fenton method was remarkable under microwave induction. The results of UV-vis and IR analysis showed that the catalyst could adsorb and degrade methyl orange, microwave could directly induce H2O2 to produce OH to degrade methyl orange. The thermal effect of microwave accelerates the reaction of the whole system.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O643.32;X703

【参考文献】