Sintesis Membran Kitosan dengan Crosslinker Kalium Persulfat untuk Pemisahan Zat Warna Rhodamin B

Abstract

Chitosan membrane is a semipermeable porous medium that can separate particles of molecular size in a solution system by filtration and adsorption. Adsorption occurs because chitosan has an amino group (NH₃⁺), so it can adsorb negative ions. Membrane performance can be improved by adding crosslinker potassium persulfate. The test material is Rhodamine B because it has chlorine ion (Cl^-) so it can bind to NH3⁺ on the chitosan membrane. The membrane made by dissolving chitosan powder into 200 mL of 1% acetic acid, then added potassium persulfate with mass variations. Adsorption of Rhodamine B is carried out with a time variation. The relatively good mechanical properties of the membrane can be seen from the results of the Screw Test Stand with stress value 1.9726 MPa and  strain value 2.78%. The performance was relatively good obtained on 0.25 grams of potassium persulfate in 4 grams of chitosan with 75 minutes of adsorption time and was able to reduce the concentration of Rhodamine B from 2.8864 ppm to 1.7477 ppm. The morphological properties shown with the pore size 0.20 µm-1.00 µm and it is classified as ultrafiltration membrane so it can hold Rhodamine B particles with diameter 10 µm.