Paper Title
Synthesis And Characterization Of Titanosilicate Compounds For Pb (Ii) Removal

Abstract
Lead (Pb) is considered a highly toxic element to both human and environment. In this study, titanosilicate (TSi) compounds were synthesized and tested for removal of lead (Pb). The TSi sorbent was synthesized using sol-gel synthesis of titanium (IV)-isopropoxide (TiPO) and tetraethylorthosilicate (TEOS) mixed together with sodium hydroxide at various onditions. The adsorbents were characterized for their morphology and phases using scanning electron microscope and X-ray diffraction (XRD). The maximum Pb(II) adsorption capacities of the sorbents obtained are very high and in the range of 300-400 mg Pb /g sorbent. By analyzing the ratio of the released sodium ion from the sorbent to the ratio of the adsorbed Pb(II), the Pb(II) removal mechanisms are inferred to be mainly the ion-exchange. X-ray diffraction patterns show that the synthesized sorbents are mostly in the amorphous to the semi-crystalline phases. The sorbent in the semi-crystalline state was prepared by the sol-gel synthesis followed by hydrothermal treatment at 200C for 6h and has the highest adsorption capacity. Further increase in hydrothermal time resulted in sorbent with crystalline structure, however, the sorption performance was reduced. Keywords- Titanosilicate, Lead, Adsorption