Ion Imprinted Polymer for Chromium(VI) Adsorption in Tannery Waste Water Alya Amalia, M. Bachri Amran
Bandung Institute of Technology
Abstract
This research aims to perform the adsorption of chromium(VI) ions in the liquid waste of the leather tanning industry using ion imprinted polymers. Ion Imprinted Polymers (IIP) were developed on the same principle as the lock and key mechanism for recognizing and removing ions. In this research, synthesis of chromium(VI) ion imprinted polymer which is selective for chromium(VI) ion in leather tanning industry waste samples was carried out. IIP preparation was carried out using Cr(VI) ion, 1,5-diphenyl carbazide as a complexing agent, methacrylic acid as a monomer, EGDMA as a crosslinker and benzoyl peroxide as an initiator. Determination of the optimum conditions for IIP adsorption which include: pH, contact time, and mass of adsorbent. The optimum conditions for Cr(VI) adsorption were obtained at pH 3, with a contact time of 240 minutes, and a Cr(VI)-IP mass of 50 mg. The characterization of the obtained IIP was analyzed using the FTIR instrument, which showed a typical spectrum at 1261.45 dan 472.56 cm-1. The adsorption isotherm model obtained is following the Freundlich isotherm model, where based on the value of 1/n, the adsorption of Cr(VI) by Cr(VI)-IP shows that the adsorbent surface is heterogeneous, with the R2 value of the Freundlich isotherm 0.9876. The adsorption kinetics model follows the pseudo-second-order kinetics model. The synthesized Cr(VI)-IP are selective against other metal ions by having a value of K^ (relative selective coefficient > 1 for Cr3+ and Cd2+ ions. Adsorption-desorption test gives a % Recovery of 87.15%. Analysis of Cr(VI) in leather tanning industry have a % Recovery of 70.06%.
Keywords: ion imprinted polymer, chromium, leather tanning industry
