Nagaraja Bhari Mallanna, Abimanyu Haznan, Jung Kwang Deog, Yoo Kye Sang
Clean Energy Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Republic of Korea.
J Colloid Interface Sci. 2007 Dec 15;316(2):645-51. doi: 10.1016/j.jcis.2007.09.004. Epub 2007 Sep 7.
The spherical and cubic mesoporous BaSO(4) particles with high surface area were successfully produced via one-step process through precipitation reaction in aqueous solution of Ba(OH)(2) and H(2)SO(4) with ethylene glycol (n-HOCH(2)CH(2)OH) as a modifying agent. The BaSO(4) nanomaterial revealed that the high surface area and the mesoporous was stable up to 400 degrees C. Agglomerate mesoporous barium sulfate nanomaterials were obtained by the reaction of Ba(2+) and SO(2-)(4) with ethylene glycol aqueous solution. The ethylene glycol was used to control the BaSO(4) particle size and to modify the surface property of the particles produced from the precipitation. The dried and calcined mesoporous BaSO(4) nanomaterials were characterized by X-ray diffraction (XRD), BET surface area and N(2) adsorption-desorption isotherm, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared resonance (FTIR) and thermogravimetric analysis (TGA). The as-prepared mesoporous dried BaSO(4) possesses a high BET surface area of 91.56 m(2) g(-1), pore volume of 0.188 cm(3) g(-1) (P/P(0)=0.9849) and pore size of 8.22 nm. The SEM indicates that the morphology of BaSO(4) nanomaterial shows shell like particles up to 400 degrees C, after that there is drastically change in the material due to agglomeration. Synthesis of mesoporous BaSO(4) nanomaterial is of significant importance for both sulphuric acid decomposition and oxidation of methane to methanol.
通过在Ba(OH)₂和H₂SO₄的水溶液中以乙二醇（n-HOCH₂CH₂OH）作为改性剂进行沉淀反应的一步法，成功制备出了具有高比表面积的球形和立方介孔BaSO₄颗粒。BaSO₄纳米材料显示出其高比表面积和介孔结构在高达400℃时是稳定的。通过Ba²⁺和SO₄²⁻与乙二醇水溶液反应获得了团聚的介孔硫酸钡纳米材料。乙二醇用于控制BaSO₄的粒径并改变沉淀产生的颗粒的表面性质。通过X射线衍射（XRD）、BET比表面积和N₂吸附-脱附等温线、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外共振（FTIR）和热重分析（TGA）对干燥和煅烧后的介孔BaSO₄纳米材料进行了表征。所制备的介孔干燥BaSO₄具有91.56 m² g⁻¹的高BET比表面积、0.188 cm³ g⁻¹的孔体积（P/P₀ = 0.9849）和8.22 nm的孔径。SEM表明，BaSO₄纳米材料在高达400℃时的形态呈壳状颗粒，之后由于团聚材料发生了剧烈变化。介孔BaSO₄纳米材料的合成对于硫酸分解和甲烷氧化制甲醇都具有重要意义。
