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(NO_3)_2·6H_2O与NH_3·H_2O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^1μm,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。
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 flowerlike 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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2016年第2期241-249,共9页
Chinese Journal of Inorganic Chemistry
基金
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)
国家自然科学基金(No.21567026)资助
关键词
氧化锌
球形和花形结构
光催化
乙二醇
ZnO
spherical and flower-like nanostructures
photoeatalytic
ethylene glycol
