Jo Hye-Soo, Kim Hyeonjin, Yoon Seog-Young
Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea.
Materials (Basel). 2022 May 16;15(10):3562. doi: 10.3390/ma15103562.
Aluminum silicate powder was prepared using two different syntheses: (1) co-precipitation and (2) two-step sol-gel method. All synthesized powders were characterized by various techniques including XRD, FE-SEM, FT-IR, BET, porosimeter, and zetasizer. The particle morphology of the synthesized aluminum silicate powder was greatly different depending on the synthesis. The synthesized aluminum silicate powder by co-precipitation had a low specific surface area (158 m/g) and the particle appeared to have a sharp edge, as though in a glassy state. On the other hand, synthesized aluminum silicate powder by the two-step sol-gel method had a mesoporous structure and a large specific surface area (430 m/g). The aluminum silicate powders as adsorbents were characterized for their adsorption behavior towards Pb (II) ions and methylene blue in an aqueous solution performed in a batch adsorption experiment. The maximum adsorption capacities of Pb (II) ions and methylene blue onto the two-step sol-gel method powder were over four-times and seven-times higher than that of the co-precipitation powder, respectively. These results show that the aluminum silicate powder synthesized with a two-step sol-gel method using ammonia can be a potential adsorbent for removing heavy metal ions and organic dyes from an aqueous solution.
（1）共沉淀法和（2）两步溶胶 - 凝胶法。所有合成的粉末都通过各种技术进行了表征，包括XRD、FE - SEM、FT - IR、BET、孔隙率仪和zeta电位仪。合成的硅酸铝粉末的颗粒形态因合成方法而异。通过共沉淀法合成的硅酸铝粉末比表面积低（158 m²/g），颗粒似乎有尖锐的边缘，好像处于玻璃态。另一方面，通过两步溶胶 - 凝胶法合成的硅酸铝粉末具有介孔结构和大的比表面积（430 m²/g）。在批量吸附实验中，对作为吸附剂的硅酸铝粉末在水溶液中对Pb（II）离子和亚甲基蓝的吸附行为进行了表征。两步溶胶 - 凝胶法粉末对Pb（II）离子和亚甲基蓝的最大吸附容量分别比共沉淀法粉末高出四倍和七倍以上。这些结果表明，使用氨水通过两步溶胶 - 凝胶法合成的硅酸铝粉末可能是一种从水溶液中去除重金属离子和有机染料的潜在吸附剂。
