摘要
利用不添加表面活性剂和模板的水热法合成了纳米结构的花状氧化铜。产物通过场发射扫描电镜(FE-SEM)和X-射线粉末衍射(XRD)进行了表征,并探讨了NaOH浓度和水热反应时间对产物形貌、物相和催化活性的影响。由FE-SEM结果可知制备的CuO的形貌是由纳米片组成的花状结构,NaOH浓度和水热反应时间对产物形貌有影响,NaOH浓度越大反应时间越短,越有益于花状结构的生成;XRD结果可知花状CuO具有单斜晶型,NaOH浓度和水热反应时间不影响产物的晶型;制备的CuO的催化活性通过甲苯在空气中的催化氧化反应来验证,选择性通过CO_2生成率来表示。所制备的纳米结构CuO都展示出良好的催化活性、选择性和使用寿命,表明CuO对减少挥发性有机物具有潜在的应用前景。
Flower-like copper oxide used as a catalyst in degrading toluene by combustion was synthesized with a facile hydrothermal process of neither templates nor surfactants. The products prepared were characterized by field emission scanning electron microscope （FE-SEM） and X-ray powder diffraction （XRD）, and the effects of NaOH concentration and hydrothermal reaction time on the morphology, crystal phase and catalytic activity of the final product were studied. FE-SEM images showed that the flower-like CuO nanostructures were composed of nano-sheets; concentration of NaOH and hydrothermal reaction time considerably influenced the morphology of CuO nanostructures; and flower-like oxides were easily fabricated by increasing NaOH concentration or shorten hydrothermal reaction time. The XRD patterns revealed that the formation of monoclinic CuO had nanostructures; and NaOH concentration and hydrothermal reaction time did not affect the crystal phase of the products. In addition, catalytic activity of the as-prepared CuO nanostructures could be verified by catalytic oxidation of toluene in air and the selectivity was expressed by the production rate of CO2. Summarily, all of the as- prepared copper oxides showed a good catalytic activity, catalytic selectivity and service life, suggesting their potential applications in reducine volatile oraanic compounds.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第8期30-35,49,共7页
Environmental Science & Technology
基金
新疆维吾尔自治区自然科学基金项目(2015211C284)
关键词
花状氧化铜
催化氧化
甲苯
flower-like copper oxide
catalytic oxidation
toluene
