摘要
采用喷雾热解法结合二次煅烧的方法合成了多孔的Al_(2)O_(3)纳米微球,研究不同工艺条件对产物微观形貌和物相的影响,并进一步探讨了热解温度、尿素含量及煅烧对吸附性能的影响。结果表明:600℃热解0.2 mol/L的硝酸铝溶液,产率较高,能得到形貌最佳的粒径分布均匀的小粒径粉体,经煅烧后,粉体可变得分散。当在上述基础上再加入造孔剂或加入与前驱体质量比为4∶1的尿素时,可得到多孔的氧化铝粉体;对比发现,经900℃高温煅烧的氧化铝的吸附效果最佳,对刚果红的吸附率达到98.9%。这是由于煅烧中部分造孔剂冲破外壳层,形成的疏松结构能给氧化铝的吸附提供更多的位点、更大的接触面积,使吸附率显著提升,本文所述方法可作为一种理想的多孔氧化铝绿色可控合成方法。
Porous Al_(2)O_(3)nanospheres were synthesized by spray pyrolysis combined with secondary calcination.The effects of different process conditions on the microstructure and phase of the products were studied.The effects of pyrolysis temperature,urea content and calcination on the adsorption performance were further discussed.The results show that the aluminum nitrate solution of 0.2 mol/L is pyrolyzed at 600℃,the yield is higher,and the small particle size powder with the best particle size distribution can be obtained.After calcination,the powder can become dispersed.Porous alumina powder can be obtained by adding pore-forming agent or urea with a mass ratio of 4∶1 to the precursor.It was found that the alumina calcined at 900℃had the best adsorption effect,and the adsorption rate of Congo red reached 98.9%.This is because some pore-forming agents break through the shell layer during calcination,and the loose structure formed can provide more sites and larger contact area for the adsorption of alumina,so that the adsorption rate is significantly improved.The method described in this paper can be used as an ideal porous alumina synthesis method.
作者
陈雪谊
钟洪彬
张平
稂雨繁
赖葆芬
胥锦洋
Chen Xueyi;Zhong Hongbin;Zhang Ping;Lang Yufan;Lai Baofen;Xu Jinyang(Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials,School of Materials and Environmental Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China)
出处
《广东化工》
CAS
2024年第3期36-38,19,共4页
Guangdong Chemical Industry
基金
2022年度湖南省大学生研究性学习和创新性实验计划项目(湘教通2022[174]号S202210553018)
2020年娄底市科技计划项目(娄财教指[2020]43号)
湖南省教育厅优秀青年项目(20B322)
湖南省企业科技特派员计划(2021~2022年)项目(湘科计[2022]4号)
2022年度精细陶瓷与粉体材料湖南省重点实验室开放基金项目(TC202205)。
