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This study aims to determine the surface area and adsorption power of the chitosan membrane against Pb (II) metal ions in the Tallo river basin and determine the optimization of Pb (II) ion absorption by chitosan membrane adsorbents and the adsorption time of the chitosan membrane against Pb (II) metal ion in Tallo river basin. The method used in this study consisted of chitosan synthesis from crab shell waste, chitosan membrane design with various membrane variations comprised of a concentration ratio of chitosan and cellulose acetate respectively 35%, 65%, 45%: 55%, 50 %: 50% and 65%: 35% with variations in adsorption time of 10; 25; 45; 60 minutes, then followed by the adsorption mechanism of the chitosan membrane against Pb (II) metal ions. Determination of the surface area was carried out using the Brunner Emmer Teller (BET) analysis. In contrast, the optimization of Pb (II) ion absorption and adsorption power was carried out using UV Vis spectrophotometry. The results showed that the surface area of the chitosan membrane reached 765 m 3  / g, a pore volume of 1,267 cc / g, and a pore diameter of 4.7 nm, the adsorption capacity of the chitosan membrane against Pb (II) metal ions was 76.34%. In comparison, the adsorption capacity of the chitosan membrane against ions Pb (II) metal was 68.5 mg / g for 100 minutes. This study recommends the use of a chitosan membrane to reduce the levels of Pb (II) metal ions and improve the quality of Tallo river water for consumption.

Chitosan membrane technology as adsorbent media: management of Tallo River Basin Makassar City, South Sulawesi, Indonesia