Activation and Modification of Natural Silica for Anion Adsorbent

Silica is a mineral that is abundant in the earth's surface. Silica has also been used in
human civilization, such as making glass, electronic devices, adsorbents, fertilizers and others.
Utilization of natural silica requires technology that is reliable enough so that impurities in the
natural silica do not interfere with its use. In this study, tests have been carried out on natural
silica, such as chemical and physical activation, reactions with certain reagents and also
modifications made to the natural silica. The desired result is that natural silica can be used as
an adsorben, ion exchange and also a stationary phase in the chromatography column. From this
research a natural silica modification has been obtained using dimethylamine (DMA) to convert
natural silica into positive charge so that it can be used to increase the absorption of some anions.