Fe-Si-B系非晶合金表面微纳米化与催化性能的研究

发布时间：2018-05-11 00:29

  本文选题：铁基非晶合金 + 多孔结构　； 参考：《长春工业大学》2017年硕士论文

【摘要】：近几年来,由于具有独特的性能以及优异的催化性能,铁基非晶合金受到广泛关注,部分铁基非晶合金被发现能作为零价铁对工业废水进行快速降解。尽管目前研究尚处于初始阶段,涉及铁基非晶合金的降解性能的众多问题还不清楚,但其展示出的优异的污水降解性能对工程应用具有很大吸引力,因此开展相关研究具有重要科学意义和实用价值。本研究以Fe-Si-B系三元非晶合金为基础,系统地研究了铁基非晶合金表面多孔结构的制备工艺,以及具有多孔结构的典型铁基非晶合金催化苯酚废水降解反应的动力学过程和催化反应机理。本研究采用去合金化法,通过选择不同的腐蚀溶液,并控制反应时间、反应温度、溶液浓度及超声波辅助频率,来调控多孔结构的制备工艺。最终,成功在Fe-Si-B系三元非晶合金表面制备出孔径尺寸在30~150nm范围内的均匀多孔结构。经研究发现,与相同成分的非晶合金条带相比,具有多孔结构的Fe-Si-B三元非晶合金在苯酚溶液的降解过程中,表现出更低的降解反应活化能和更高的降解速率。通过改变实验参数,得出纳米多孔Fe_(76)Si_(7.2)B_(9.6)P_(7.2)非晶催化剂降解50mL、浓度为1g/L苯酚的最优实验条件,当反应温度为50℃,溶液初始pH值为4,加入催化剂浓度及双氧水浓度分别为4g/L及0.3mol/L,反应30min后,苯酚的完全降解效率达到95%以上。在相同实验条件下,分析表明,Fe-Si-B三元非晶合金对苯酚溶液降解机理与晶态材料相同,具有多孔结构的Fe-Si-B三元非晶合金所具有的高的降解性能一方面是由于非晶态结构相对于晶态具备更高活性;另一方面是由于多孔结构的存在促进了物质交换,从而提高了降解速率。同时研究发现,具有多孔结构的Fe-Si-B非晶合金条带具有良好的重复利用性能,具有优异的应用前景。
[Abstract]:In recent years, due to their unique properties and excellent catalytic properties, Fe-based amorphous alloys have attracted wide attention. Some Fe-based amorphous alloys have been found to be able to rapidly degrade industrial wastewater as zero-valent iron. Although the current research is still in its initial stage and many problems related to the degradation properties of Fe-based amorphous alloys are not clear, its excellent wastewater degradation performance is attractive for engineering applications. Therefore, it is of great scientific significance and practical value to carry out relevant research. Based on the Fe-Si-B system ternary amorphous alloy, the preparation process of porous structure on the surface of Fe-base amorphous alloy was studied systematically. The kinetic process and mechanism of catalytic reaction of phenol wastewater catalyzed by typical Fe-based amorphous alloys with porous structure were also discussed. In this study, the preparation process of porous structure was controlled by selecting different corrosion solution, controlling reaction time, reaction temperature, solution concentration and ultrasonic assisted frequency by dealloying. Finally, the uniform porous structure with pore size in the range of 30~150nm was successfully prepared on the surface of Fe-Si-B ternary amorphous alloy. It is found that the Fe-Si-B ternary amorphous alloy with porous structure exhibits lower activation energy and higher degradation rate in the degradation of phenol solution than the amorphous alloy strip with the same composition. By changing the experimental parameters, it is obtained that the optimum experimental conditions for the degradation of 1g/L phenol on amorphous catalyst are as follows: the reaction temperature is 50 鈩，

本文编号：1871617