Amorphous Silica Material Prepared from Kaolin and Its Adsorption Properties to Ca2+ and Mg2+

作者：Li Jian; Li Yan; Mou Zhan-Jun; Zhang Xin-Ying; Hao Yun-Hong; Wu Zhao-Jun^*

来源：Chinese Journal of Inorganic Chemistry, 2016, 32(11): 2049-2057.

DOI：10.11862/CJIC.2016.254

• amorphous silica material
• preparation
• kaolin
• adsorption

A novel amorphous silica material (ASM) was successfully prepared from kaolin and characterized by several techniques, including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and N-2 adsorption-desorption. The preparation procedure of ASM involved two aspects: SiO32- leaching from kaolin and preparation of ASM. The optimum Si032- leaching condition was confirmed at calcination temperature of 960 degrees C, NaOH concentration of 20%, reaction temperature of 90 degrees C and reaction time of 90 min. Under this condition, SiO32- leaching yield arrived at 60.45%(w/w). The ASM was then easily prepared from Si032- leaching at the silica concentration of 12 g reaction temperature of 90 degrees C, reaction time of 60 min and aging time of 2 h. The removal behavior of Ca2+ and Mg2+ revealed that the removal rate of Ca' and Mg' on the ASM could arrived at 94.99% and 62.32%, respectively.

• 出版日期2016-11-10
• 单位内蒙古工业大学