Synthesis Of Spherical Chitosan-Zeolite Composite (Ch-Z Spherical) From Shrimp Shells Using Crosslinking Method As Adsorbent Of Metal Ca (Ii) And Mg (Ii)

Abstract Water quality is very important to know because it is related to the use of water for daily needs and has a direct effect on the health of humans who consume the water. Water quality includes three main parameters, namely physics, chemistry, and biology. One of Chemical water quality parameter is the level of water hardness. One of the efforts made to reduce hardness is to add materials that can bind Ca (II) and Mg (II) metal ions. In this study, the material used was chitosan from shrimp shell waste modified with zeolite into a chitosan/zeolite composite in a spherical form using Tripolyphosphate as a crosslinking which interacts to form bonds through ionic gelation. The spherical chitosan-zeolite composite was characterized using FT-IR. The results of characterization using FT-IR at a wavelength of 4000-450 cm-1 show a typical IR spectrum for Chitosan-Zeolite Spherical (Ch-Z Spherical) at wavelengths 1639 cm-1, 1638.71 cm-1, respectively. and 1638.58 cm-1 which is the -C⁼N strain or structural change (deformation) of NH2.Chitosan-Zeolite Spherical Composite was applied to reduce the concentration of Ca(II) and Mg(II) metals which can cause water hardness. To determine the effectiveness of the optimum absorption time of the Spherical Chitosan-Zeolite composite, contact time variations were made, namely 15, 30, 45, 60, 90 with a concentration of 500 ppm of Ca (II) and Mg (II) metals with a stirring process. The results showed that the optimum time for the absorption of metal Ca(II) was 90 minutes with an absorption concentration of 0.012 mol/g. The optimum contact time of the spherical chitosan-zeolite composite to Mg(II) metal ion is 15 minutes with an absorption concentration of 0.1 mol/g.