氧化铜/氧化锌/3A分子筛光催化剂的制备及其可见光脱氮性能

doi:10.11944/j.issn.1000-0518.2015.09.150075

摘要/Abstract

摘要：

采用浸渍法合成了氧化铜/氧化锌/3A分子筛(CuO/ZnO/3A)复合催化剂,并利用X射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)、X射线光电子能谱(XPS)等技术手段对催化剂的结构及性能进行了系统的表征;以吡啶-正辛烷体系为模拟油品氮源,系统研究了该催化剂在可见光作用下的光催化脱氮行为,并系统考察了催化剂的制备条件、用量及催化时间对其脱氮性能的影响。结果表明,随着锌源与铜源加入量的增加,CuO/ZnO/3A复合物的光催化活性,呈现先增大后降低的规律。在400 ℃煅烧5 h的情况下,当锌源的加入质量分数为9.8%,铜源的加入质量分数为28.6%时,在可见光照射条件下,反应150 min后,CuO/ZnO/3A复合催化剂对50 mL吡啶质量分数为100 μg/g的模拟油品中吡啶的脱氮率达到74.78%。

关键词: 氧化铜/氧化锌/3A分子筛, 光催化, 可见光, 脱氮

Abstract:

Copper oxide/zinc oxide/3A molecular sieve(CuO/ZnO/3A) photocatalyst was prepared by impregnation method and calcined in 450 ℃, and the structure of CuO/ZnO/3A was characterized by X-ray diffraction(XRD), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS), and X-ray photoelectron spectroscopy(XPS). Its photocatalytic denitrification behavior was studied by pyridine-n-octane system for simulated oil source of nitrogen under visible light irradiation. The influences of the preparation conditions of the photocatalyst, the amount of photocatalyst and the time of light irradiation on the photocatalytic denitrification performance were investigated. With the increase of the amount of metal oxide, photocatalytic activity of the complex increased at first and then decreased. The CuO/ZnO/3A composite photocatalyst calcined at 400 ℃ for 5 h with 9.8% mass fraction of zinc and 28.6% of copper enabled 74.78% denitrification of the simulated oil system, after a reaction under visible light of 50 mL solution containing 100 μg/g of pyridine for 150 min.

Key words: copper oxide/zinc oxide/3A molecular sieve, loaded amount, photocatalysis, denitrification, light absorption

陈峰,黄莹莹,颜桂炀,樊海梅,黄仁昆. 氧化铜/氧化锌/3A分子筛光催化剂的制备及其可见光脱氮性能[J]. 应用化学, 2015, 32(9): 1040-1047.

CHEN Feng,HUANG Yingying,YAN Guiyang,FAN Haimei,HUANG Renkun. Preparation and Visible Light Denitrification Performance of Copper Oxide/Zinc Oxide/3A Molecular Sieve Photocatalyst[J]. Chinese Journal of Applied Chemistry, 2015, 32(9): 1040-1047.

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