| 球形和花形ZnO纳米结构的可控制备及其光催化机理 | |
| Controllable Synthesis and Photocatalytic Mechanism of Spherical and Flower-like ZnO Nanostructures | |
| 摘要: 报道了一种简单的制备球形和花形ZnO纳米结构的无模板水热法。在Zn(NO3)2·6H2O与NH3·H2O的体系中,通过改变乙二醇和水的体积比,140℃水热反应2 h分别制备出球形和花形ZnO纳米结构。采用SEM、XRD、UV-Vis DRS和PL对其进行了表征和分析,结果表明球形ZnO纳米结构的直径为500 nm~1 μm,它是由纳米颗粒自组装而成;花形ZnO纳米结构是由长度为300~700 nm,直径为100~300 nm的纳米棒组装而成。研究了乙二醇在球形和花形ZnO纳米结构形成过程中的作用并提出了可能的生长机理。室温下分别以球形和花形ZnO纳米结构为光催化剂,以偶氮染料甲基橙MO作为光催化研究对象,紫外光照2 h,对MO的降解率分别为83%和55%。以叔丁醇(t-Butanol)、乙二胺四乙酸二钠(EDTA-2Na)为自由基和空穴的捕获剂,推测其催化机理主要为空穴氧化和自由基协同氧化历程。 | |
| 关键词: 氧化锌 球形和花形结构 光催化 乙二醇 | |
| 基金项目: 新疆大学先进功能材料自治区重点实验室开放课题(No.XJDX0902-2013-03)和国家自然科学基金(No.21567026)资助。 | |
| Abstract: The spherical and flower-like ZnO nanostructures have been synthesized by a simple hydrothermal reaction of Zn(NO3)2·6H2O with NH3·H2O by varying the volume ratio of ethylene glycol and water at 140℃ for 2 h, respectively. The products were characterized by SEM, XRD, UV-Vis DRS and PL, the results showed that the products were single crystalline with the wurtzite structure. The diameter of spherical ZnO nanostructure assembled nanoparticles is ranged from 500 nm~1 μm. The flower-like ZnO nanostructures are assembled from one-dimensional nanorods with the diameter is ranged from 100~300 nm and length is ranged from 300~700 nm. The influence of ethylene glycol on the morphology development was investigated. Possible growth mechanisms of the spherical and flower-like ZnO nanostructures were proposed. Photocatalytic activities of the spherical and flower-like ZnO nanostructures in the degradation of methyl orange were investigated. The degradation rate of the spherical and flower-like ZnO nanostructures under 2 h UV irradiation were 83% and 55%, respectively. The study on photocatalytic mechanism confirmed that h+ and·OH were the main reactive species during the photocatalytic process. | |
| Keywords: ZnO spherical and flower-like nanostructures photocatalytic ethylene glycol | |
| 投稿时间：2015-08-07 修订日期：2015-12-11 | |
| 摘要点击次数: 1819 | |
| 全文下载次数: 1575 | |
| 李丽,刘晓明,周舒婷,刘仕涛,贾殿赠.球形和花形ZnO纳米结构的可控制备及其光催化机理[J].无机化学学报,2016,32(2):241-249. | |
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