Putz Ana-Maria, Ivankov Oleksandr I, Kuklin Alexander I, Ryukhtin Vasyl, Ianăşi Cătălin, Ciopec Mihaela, Negrea Adina, Trif László, Horváth Zsolt Endre, Almásy László
"Coriolan Drăgulescu" Institute of Chemistry, Bv. Mihai Viteazul, No. 24, 300223 Timisoara, Romania.
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Russia.
Gels. 2022 Jul 15;8(7):443. doi: 10.3390/gels8070443.
In this work, the synthesis of ordered mesoporous silica of MCM-41 type was investigated aimed at improving its morphology by varying the synthesis conditions in a one-pot process, employing different temperatures and solvent conditions. 2-methoxyethanol was used as co-solvent to ethanol. The co-solvent ratio and the synthesis temperature were varied. The pore morphology of the materials was characterized by nitrogen porosimetry and small angle neutron scattering (SANS), and the particle morphology by transmission electron microscopy (TEM) and ultra-small angle neutron scattering (USANS). The thermal behavior was investigated by simultaneous thermogravimetry-differential scanning calorimetry (TG-DSC) measurements. The SANS and N sorption results demonstrated that a well-ordered mesoporous structure was obtained at all conditions in the synthesis at room temperature. Addition of methoxyethanol led to an increase of the pore wall thickness. Simultaneously, an increase of methoxyethanol content led to lowering of the mean particle size from 300 to 230 nm, according to the ultra-small angle scattering data. The ordered porosity and high specific surfaces make these materials suitable for applications such as adsorbents in environmental remediation. Batch adsorption measurements of metal ion removal from aqueous solutions of Cu(II) and Pb(II) showed that the materials exhibit dominantly monolayer surface adsorption characteristics. The adsorption capacities were 9.7 mg/g for Cu(II) and 18.8 mg/g for Pb(II) at pH 5, making these materials competitive in performance to various composite materials.
在这项工作中，研究了MCM-41型有序介孔二氧化硅的合成，旨在通过在一锅法中改变合成条件、采用不同温度和溶剂条件来改善其形态。使用2-甲氧基乙醇作为乙醇的共溶剂。改变共溶剂比例和合成温度。通过氮气孔隙率测定法和小角中子散射（SANS）对材料的孔形态进行表征，通过透射电子显微镜（TEM）和超小角中子散射（USANS）对颗粒形态进行表征。通过同步热重-差示扫描量热法（TG-DSC）测量研究热行为。SANS和N吸附结果表明，在室温合成的所有条件下均获得了有序的介孔结构。添加甲氧基乙醇导致孔壁厚度增加。同时，根据超小角散射数据，甲氧基乙醇含量的增加导致平均粒径从300nm降低到230nm。有序的孔隙率和高比表面积使这些材料适用于环境修复中的吸附剂等应用。从Cu(II)和Pb(II)水溶液中去除金属离子的批量吸附测量表明，这些材料主要表现出单层表面吸附特性。在pH为5时，对Cu(II)的吸附容量为9.7mg/g，对Pb(II)的吸附容量为18.8mg/g，这使得这些材料在性能上与各种复合材料具有竞争力。
