新型可见光催化剂的开发及其应用
发布时间：2018-10-19 12:45
【摘要】：在进入21世纪后,人类可开发的能源资源已经严重不足,并且大量的环境污染问题都是来自于能源的利用,这些都严重影响了人类的生存。相对其它化石能源而言,太阳能是大自然给予人类的巨大财富,它储量丰富,清洁安全,廉价易得。现在国内外的研究者们越来越重视太阳能激发的半导体光催化技术,该技术不但可以解决能源问题,在太阳能驱动下裂解水,从而得到清洁能源氢气;也可以解决环境问题,将水体中的有机污染物降解,转化为二氧化碳和水。因此,半导体光催化技术被看作是最有应用潜力的太阳能技术之一。本论文中,我们以g-C_3N_4,草酸亚铁,BiOI作为催化剂,在可见光下降解罗丹明B和甲基橙,通过我们的研究和创新,他们都有较好的可见光催化性能。g-C_3N_4在可见光下很难降解甲基橙,当在g-C_3N_4体系中加入少量草酸,甲基橙可以在很短时间内被彻底降解。将草酸与块状g-C_3N_4体系结合可以很大的提高g-C_3N_4光催化降解甲基橙的性能。这可能是因为有草酸参与的g-C_3N_4体系会使分子氧产生过氧化氢。在草酸辅助下用草酸亚铁作为催化剂降解罗丹明B和甲基橙时,我们发现在草酸存在的情况下,光降解速率.以被很大的提高。因此,我们对它的光催化机理也进行了分析,认为在可见光驱动催化体系中草酸是一种独特且高效的牺牲因子。我们采用一种新颖的研磨方法制备β-草酸亚铁,该方法是将硫酸亚铁和草酸混合后用简单的研磨法研磨,得到新颖的纳米片状β-草酸亚铁,然后在100℃条件下沉化10小时,使得β-草酸亚铁转化为α-草酸亚铁。通过它们在可见光下对罗丹明B的降解能力来估算它们的光催化活性。实验证明,它们都具有良好的光催化活性。在乙酸钠辅助下,在不同溶剂体系中制备的所有BiOI都是小且薄的纳米片,在XRD图中(110)/(102)的强度比率比标准值(JCPDS card no.10-0445)大很多,表明了其优先生长方向是(110)方向。它们在可见光照射下的光催化降解甲基橙的能力比没有乙酸钠辅助的时候高。因此,这为制备具有高光催化活性的暴露面为{001}的BiOI纳米片提供了新的途径。
[Abstract]:After entering the 21st century, the energy resources that can be exploited by human beings have been seriously insufficient, and a large number of environmental pollution problems come from the use of energy, which have seriously affected the survival of human beings. Compared with other fossil energy, solar energy is a great wealth given by nature. It is abundant, clean, safe and cheap. Now researchers at home and abroad are paying more and more attention to the semiconductor photocatalysis technology, which can not only solve the energy problem, but also can solve the environmental problems. The organic pollutants in the water are degraded and converted into carbon dioxide and water. Therefore, semiconductor photocatalytic technology is regarded as one of the most promising solar energy technologies. In this paper, we use g-C3N4, ferrous oxalate, BiOI as catalyst, and decompose Rhodamine B and methyl orange in visible light. Through our research and innovation, they all have better catalytic performance in visible light. It is very difficult for g-C_3N_4 to degrade methyl orange under visible light. When a small amount of oxalic acid is added to g-C_3N_4 system, methyl orange can be completely degraded in a very short time. The combination of oxalic acid and bulk g-C_3N_4 system can greatly improve the photocatalytic degradation of methyl orange by g-C_3N_4. This may be due to the presence of oxalic acid in the g-C_3N_4 system, which causes molecular oxygen to produce hydrogen peroxide. In the presence of oxalic acid, the photodegradation rate of Rhodamine B and methyl orange was found when ferrous oxalate was used as catalyst. To be greatly improved. Therefore, the photocatalytic mechanism of oxalic acid is also analyzed. It is considered that oxalic acid is a unique and efficient sacrificial factor in visible light driven catalytic system. A novel grinding method was used to prepare ferrous 尾 -oxalate. The method was to grind ferrous sulfate and oxalic acid with a simple grinding method to obtain novel nano-flake 尾 -oxalate, and then sink at 100 鈩，
本文编号：2281154
[Abstract]:After entering the 21st century, the energy resources that can be exploited by human beings have been seriously insufficient, and a large number of environmental pollution problems come from the use of energy, which have seriously affected the survival of human beings. Compared with other fossil energy, solar energy is a great wealth given by nature. It is abundant, clean, safe and cheap. Now researchers at home and abroad are paying more and more attention to the semiconductor photocatalysis technology, which can not only solve the energy problem, but also can solve the environmental problems. The organic pollutants in the water are degraded and converted into carbon dioxide and water. Therefore, semiconductor photocatalytic technology is regarded as one of the most promising solar energy technologies. In this paper, we use g-C3N4, ferrous oxalate, BiOI as catalyst, and decompose Rhodamine B and methyl orange in visible light. Through our research and innovation, they all have better catalytic performance in visible light. It is very difficult for g-C_3N_4 to degrade methyl orange under visible light. When a small amount of oxalic acid is added to g-C_3N_4 system, methyl orange can be completely degraded in a very short time. The combination of oxalic acid and bulk g-C_3N_4 system can greatly improve the photocatalytic degradation of methyl orange by g-C_3N_4. This may be due to the presence of oxalic acid in the g-C_3N_4 system, which causes molecular oxygen to produce hydrogen peroxide. In the presence of oxalic acid, the photodegradation rate of Rhodamine B and methyl orange was found when ferrous oxalate was used as catalyst. To be greatly improved. Therefore, the photocatalytic mechanism of oxalic acid is also analyzed. It is considered that oxalic acid is a unique and efficient sacrificial factor in visible light driven catalytic system. A novel grinding method was used to prepare ferrous 尾 -oxalate. The method was to grind ferrous sulfate and oxalic acid with a simple grinding method to obtain novel nano-flake 尾 -oxalate, and then sink at 100 鈩，
本文编号：2281154
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