PRECONCENTRATION AND CADMIUM ION ANALYSIS USING ION-IMPRINTED INTERPENETRATING POYMER NETWORKS (IPNs)

• Main Author: YUNITASARI (NIM:20516054), DIAH
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26595
• Institution: Institut Teknologi Bandung

Cadmium is a type of heavy metal which is found in relatively small quantities from the natural processes such as volcanic activity and weathering of rocks. The presence of cadmium in the environment can increase because of the process of industrial waste disposal and the use of oil as fuel. Cadmium is classified as a dangerous metal because it cannot be degraded by microorganisms and will accumulate if it enters in the human body. In small amounts, cadmium has a toxic and carcinogenic effect on the human body. According to government regulation number 82 of 2001 about concerning water quality management and control of water pollution, heavy metal cadmium in the waters for class II must not exceed 0,01 mg/L. Cadmium concentration can be analyzed using Atomic Absorption Spectrophotometry (AAS). However, this instrument has a low sensitivity in determining the concentration of cadmium in water at low levels. Therefore, it is necessary to do the preconcentration stage using ion-printing polymers before the determination of cadmium levels using spectrophotometry. In this research, silica xerogel, poly(resorcinol-formaldehyde), interpenetrating polymer networks (IPNs) and Cd(II) ion-imprinted interpenetrating polymer networks (IPNs). Cd(II) ion-imprinted interpenetrating polymer networks (IPNs) are used for the preconcentration phase of Cd (II) ions in water. Characterization of Cd(II) ion-imprinted IPNs using infrared spectroscopy showed the absorption at wavenumbers 3412 cm-1, 1618 cm-1, 1512 cm-1, 1442 cm-1, 1089 cm-1, 972 cm-1 and 796 cm-1 which shows the existence of functional groups –OH, C=O, C=C aromatic, Si-O-Si, Si-OH, and CH. Characterization by Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS) shows the differences in surface morphology of polymeric materials of IPNs, Cd(II) ion-imprinted IPNs, and Cd(II) ion-imprinted IPNs after the ion release process. The SEM-EDS results show that the Cd(II) ion-imprinted have the ability to absorb and release Cd (II) ions. Characterization using the Thermo Gravimetric Analyzer (TGA) showed that polymer material experienced a change in mass percent per temperature change when heated to a temperature of 1000 0C. Evaluation of adsorption parameters was carried out by batch method and showed that the Cd(II) ion-imprinted IPNs worked optimally at pH 5 with a contact time of 15 minutes. Cd(II) ion-imprinted IPNs has a retention capacity of 21,20 mg/g at 150 ppm analyte concentration by following the pseudo-second order adsorption kinetics and Freundlich adsorption isotherm. The adsorption-desorption process gives a recovery value of around 100% with concentration factor 2 times and without concentration factor. The application of Cd(II) ion-imprinted IPNs for the analysis of Cd (II) ion concentrations in river water samples showed that the Cd (II) ion concentration in the river water sample was 70,93 ppb.