121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-516
Subject Synthesis of LTA Zeolites with Controlled Crystal Sizes for Selective Removal of Radioactive Ions
Authors Suyeon Yu, Seungdon Kwon, Kyungsu Na*
Department of Chemistry, Chonnam National University, Korea
Abstract LTA zeolites with various crystal sizes were synthesized by hydrothermal synthesis method, wherein various synthetic variables were carefully controlled. More specifically, effect of pH was investigated by controlling the relative ratio of tetramethylammonium hydroxide and sodium hydroxide in the synthesis gel composition. In addition, effects of aging time, synthesis time and hydrothermal temperature were also investigated profoundly. The resultant LTA zeolites were characterized with X-ray diffraction and scanning electron micrograph analyses. The results show that the variation of synthetic parameters enables systematic control of LTA zeolite crystal sizes with uniform distributions: 75±20 nm, 90±27 nm, 110±20 nm, 150±26 nm, 245±30 nm, 500±22 nm, 1.5 μm±350 nm and 3 μm±540 nm. The series of LTA zeolites with controlled crystal sizes is ion-exchanged to Na+-form, which is typically known as NaA zeolites with LTA framework structure having pore aperture size of 4 Å. These zeolites were further investigated in the selective removal of radioactive ions such as Cs+ and Sr2+ from the sea water. Depending on the crystal sizes of LTA zeolites, the adsorption kinetics and quantities were changed. The details of synthesis of LTA zeolites with controlled sizes and application in pollutant removal will be addressed in this presentation.
E-mail suyeon.sue.yu@gmail.com