球形纳米氧化镁的制备及其粒度影响因素
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摘要
纳米氧化镁作为吸附剂和催化剂,在环保、催化等领域具有重要的应用。本文利用溶胶-凝胶法,以四水乙酸镁为镁源,CTAB为表面活性剂,二水草酸为pH调节剂,通过控制不同制备条件制备出不同粒度的纳米氧化镁,粒度范围在16.3 nm-44.3 nm。四水乙酸镁的用量、反应温度、煅烧温度和煅烧时间都影响纳米氧化镁粒度大小,其中四水乙酸镁的用量和反应温度是影响粒度大小的主要因素。由于采用的原料来源广泛,价格低廉,方法简单,对纳米材料的制备具有重要的指导意义。
Nano-MgO can be used as an adsorbent and catalyst,and has important applications in environmental protection,catalysis and other fields.The main research direction of this paper is to prepare nanometer magnesium oxide of different particle sizes.By using sol-gel method,magnesium acetate tetrahydrate is used as the magnesium source,CTAB is the surfactant,and oxalic acid dihydrate is used as the pH regulator to control different preparation conditions.Finally,nanometer magnesium oxide with particle sizes ranging from 16.3 nm to 44.3 nm was prepared.The amount of magnesium acetate tetrahydrate,reaction temperature,calcination temperature and calcination time all affect the size of nano-magnesium oxide.The amount of magnesium acetate tetrahydrate and the reaction temperature are the main factors affecting the particle size.Due to the wide range of raw materials used,low prices,and simple methods,it has important guiding significance for the preparation of nanomaterials.
Nano-MgO can be used as an adsorbent and catalyst,and has important applications in environmental protection,catalysis and other fields.The main research direction of this paper is to prepare nanometer magnesium oxide of different particle sizes.By using sol-gel method,magnesium acetate tetrahydrate is used as the magnesium source,CTAB is the surfactant,and oxalic acid dihydrate is used as the pH regulator to control different preparation conditions.Finally,nanometer magnesium oxide with particle sizes ranging from 16.3 nm to 44.3 nm was prepared.The amount of magnesium acetate tetrahydrate,reaction temperature,calcination temperature and calcination time all affect the size of nano-magnesium oxide.The amount of magnesium acetate tetrahydrate and the reaction temperature are the main factors affecting the particle size.Due to the wide range of raw materials used,low prices,and simple methods,it has important guiding significance for the preparation of nanomaterials.
引文
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[3]赵海燕,蒋楠.纳米氧化镁对Cr(Ⅵ)、Cr(Ⅲ)和Cu(Ⅱ)的吸附特性[J].化学研究与应用,2017,29(5):715-720.
[4]张娟.粒径和形貌对纳米颗粒吸附热力学和动力学的影响[D].太原理工大学,2017.
[5]Hemmingson S L,Feeley G M,Miyake N J,et al.Energetics of 2D and 3D gold nanoparticles on MgO(100):influence of particle size and defects on gold adsorption and adhesion energies[J].Acs Catalysis,2017,7(3):2151–2163.
[6]Wang S,Wen Y,Cui Z,et al.Size dependence of adsorption kinetics of nano-MgO:a theoretical and experimental study[J].Journal of Nanoparticle Research,2016,18(1):1-9.
[7]高慧芳.立方体纳米氧化镁的可控合成及其粒度影响因素的探究[J].应用化工,2018,29(2):148-158.
[8]Mastuli M S,Ansari N S,Nawawi M A,et al.Effects of cationic surfactant in sol-gel synthesis of nanosized magnesium oxide[J].Apcbee Procedia,2012,3(8):93-98.
[9]王彦,薛永强,谢献娜.不同粒度纳米TiO2的制备[J].广东化工,2011,38(1):1-2.
[10]韩业斌.形貌粒径可控纳米CeO2的制备及其形成机理研究[D].北京工业大学,2006.
[11]王艳荣.沉淀法制备纳米二氧化铈[D].成都理工大学,2004:35-44.
[12]朱履冰,包兴.表面与界面物理[M],天津:天津大学出版社,1992.
[13]王毓娟,揭雪飞,董新法,等.CeO2在氧化催化反应中的作用[J].电源技术,2002,26(1):43-46.
[14]Mastuli M S,Roshidah R,Mahat A M,et al.Sol-gel synthesis of highly stable nano sized MgO from magnesium oxalate dihydrate[J].Advanced Materials Research,2012,545:137-142.