| Summary: | <p>Disulfonato- silica hybrid have been prepared by immobilization of 3-chloropropiltrimethoxy-silane (CTS) and monosodium salt acid 4-amino-5hydroxy-2,7-naphtalenadisulfonat (NAHD) onto silica by sol-gel method. The NAHD and CTS bonding was carried out by reflux process with methanol as solvent producing propiltrimethoxysilanesulfonat filtrate. This propiltrimethoxysilanesulfonat filtrate is then added to sodium silicate solution produced from rice hull ash that was extract with sodium hydroxide solution, and then was given hydrochloric acid until pH=7, produced Disulfonato-Silica Hybrid (DSSH). The DSSH was used to adsorp Ca(II), Cd(II), and Cu(II) metal ions. The result of analysis showed that DSSH is much easier to adsorpt Ca than Cd and Cu wich the adsorption rate of Ca is faster than adsorption for Cu.</p>
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