摘要
将镁铝层状双氢氧化物分散在锌盐与尿素的混合液中,加热使尿素水解、锌离子沉淀,经洗涤、干燥、煅烧,再用碳酸钠溶液浸渍、煅烧,得到还原后的氧化锌/镁铝复合氧化物。用X-射线衍射(XRD)、透射电子显微镜(TEM)、氮等温吸附和傅里叶红外光谱(FTIR)等方法对所制备的氧化锌/镁铝复合氧化物的结构和性能进行了表征。以酸性红G为模型污染物评价了其去除效率及光催化活性。碳酸钠还原处理过的氧化锌/镁铝复合氧化物结构发生了改变,氧化锌的晶粒变小,复合氧化物变成了片状结构,其对酸性红G的去除效率也明显提高,质量比为2∶1的氧化锌/镁铝复合物经还原后表现出了良好的光催化活性。
Mg-Al layered double hydroxides with carbonate anions （Mg-Al-CO3-LDHs） were dispersed into a mixed solution of zinc salt and urea. Upon heating, the hydroxide ions released by the urea hydrolysis promoted the precipitation of zinc ions in the solution, and ZnO/Mg-Al mixed oxides were obtained after washing, drying and calcining. The ZnO/Mg-Al mixed oxides were restructured by soaking in Na2CO3 solution and the restructured ZnO/Mg-Al mixed oxides （re-ZnO/LDHs）were obtained after subsequent calcination. The nanocomposites were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, nitrogen adsorption-desorption, and Fourier transform infrared spectra （FTIR）. The removal efficiencies and the photocatalytic activities of the nanocomposites were investigated by the degradation of acid red G aqueous solution. After the reduction treatment by Na2CO3, the grain size of the ZnO decreased and the shape of the Mg-Al mixed oxides in re-ZnO/ LDHs changed into the sheet-like structure. The removal efficiencies of them increased apparently and the re- ZnO/LDHs with a mass ratio of 2：1 had a better photocatalytic activity.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2009年第11期1977-1981,共5页
Chinese Journal of Inorganic Chemistry
基金
国家科技支撑计划(No.2006BAA04B02-1)
上海市重点学科基金(No.B603)资助项目
关键词
光催化
吸附
氧化锌
层状双氢氧化物
photocatalysis
adsorption
ZnO
layered double hydroxide
