| 题名 | 一种新型固定式光催化膜反应器的探索研究 |
| 作者 | 孙国瞳 |
| 学位类别 | 硕士 |
| 答辩日期 | 2011-06-29 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 袁方利 |
| 关键词 | 一维纳米ZnO 光催化膜反应器 多孔氧化铝陶瓷 氧化锌陶瓷膜 |
| 其他题名 | An Exploratory Research on a New Type Immobilized Photo-catalytic Membrane Reactor |
| 学位专业 | 材料学 |
| 中文摘要 | 非均相半导体光催化技术在水污染控制，尤其是处理废水中难降解有机污染物方面具有独特的优越性。本文拟利用等离子体制备的一维纳米氧化锌之间搭接形成的孔道来获得多孔氧化锌陶瓷膜，既实现纳米氧化锌光催化降解有机污染物，同时又能有效地进行降解物分离。首先以氧化铝为骨料，加入活性炭作为成孔剂，PVA溶液作为胶黏剂，压力成型，高温烧结，获得了氧化铝多孔陶瓷基体。研究了烧结温度、成孔剂添加量对多孔陶瓷孔隙率的影响。1600 ℃烧结1 h制备的多孔氧化铝陶瓷支撑体，孔隙率为30%-40%，微观图片显示孔道分布均匀，大小在几个到几十个微米之间。利用高频热等离子体制备的一维纳米氧化锌在Al2O3多孔陶瓷支撑体上烧结制备了陶瓷膜，研究了烧结温度、ZnO分散液种类等对陶瓷膜性能的影响。实验发现随着烧结温度升高，一维纳米氧化锌的长度逐渐变短，氧化锌棒之间通过烧结颈结合形成薄膜，利用乙醇作为一维纳米氧化锌分散介质，能够在480℃的低温实现稳定烧结。制备的陶瓷膜的显微结构表明，烧结一维纳米氧化锌棒状形貌能够较好保持，棒与棒之间形成的孔道分布均匀。利用制备的多孔氧化锌陶瓷膜，建立了新型光催化膜反应器装置，分别对悬浮态纳米棒状氧化锌和新型光催化膜反应器下的光催化反应降解亚甲基蓝溶液进行了对比研究。研究发现，新型光催化膜反应器具有较好的光催化效果。并对新型光催化膜反应器的光催化机理进行了初步探讨，新型光催化膜反应器不仅能够有效供地应氧气，并且能够降低空穴和电子的复合几率，表现出良好的光催化效果。 |
| 英文摘要 | Heterogeneous phase semiconductor photo-catalytic technology has show unique advantages in the treatment of degradation of polluted water, especially in the non-biodegradable waste water. In this thesis, one-dimensional ZnO nanorod has been used to prepare ZnO membranes, which have the porous structure. The ZnO membrane acts not only as photo-catalyst, but also make the separation easily. We use alumina as aggregate, active carbon powder as pore-forming agent, PVA as adhesive. Porous alumina ceramic support was prepared by pressure molding, and sintered at high temperature. The effects of sintering on porosity were studied. Porous alumina ceramic supports sintered at 1600 ℃ have porosity of 30%-40%. The microscopic images showed that pores are well distributed with pore size from several to tens of micrometers. Experiments have been carrying out on the membrane sintered on the support using nanorod ZnO produced by radio frequency thermal plasma. The effects of sintering temperature、dispersive solution on the property of prepared ZnO membrane were studied. Results indicate that the length of the nanorod ZnO has been shorten as the increase of the sintering temperature, and film was formed with the formation of sintering necks. The prepared ZnO film which consists of ZnO nanorods sintered at 480℃ with ZnO dispersed in the ethanol, SEM shows that the nanorod kept its shape well. Third, we have built a new type of photo-catalytic membrane reactor (PMR). In this PMR, oxygen has been divided into small size and blow through the catalytic layer of ZnO nanorod membrane. In contrast with traditional suspension reactor, new PMR shows better photo-catalytic features. And the mechanism of this photo-catalytic membrane reactor has been investigated that the new PMR can supply O2 effectively which help to prevent the recombination of electrons and holes by which accelerated the photo-catalytic reaction. |
| 语种 | 中文 |
| 公开日期 | 2013-09-24 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1761]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 孙国瞳. 一种新型固定式光催化膜反应器的探索研究[D]. 中国科学院研究生院. 2011. |
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