SYNTHESIS Pb(II)-IMPRINTED POLYMER(Pb-IP) FOR SOLID PHASE EXTRACTION AND PRECONCENTRATION OF Pb(II)

• Main Author: Marsita, Lia
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34965
• Institution: Institut Teknologi Bandung

Rapid industrial growth in addition to provide benefits of economy also have a negative impact, in the form of hazardous industrial wastes such as heavy metal waste. Several heavy metals that pollute the environment are Pb, Hg, Cd, Cu, and Zn and all of them have high toxicity. One of the heavy metals which become the major pollutant is lead (Pb). Preconcentration method for the analysis of Pb (II) has been developed, such as liquid-liquid extraction, co-precipitation and solid phase extraction. However as we all know, heavy metals such as Pb (II) are commonly found in industrial waste and other solutions that have a complex matrix so method of separation with high selectivity and preconcentration method for Pb (II) becomes necessary. Development of solid phase extraction method to enhance the selectivity is continuously improved, either by solvent impregnated resins (SIR), chelating polymer and recently by using polymer functionalization, ion imprinted polymers (IIPs). In this research has been successfully synthesized Pb (II)-imprinted polymer (Pb-IP) through the polymerization of salicylic acid and formaldehyde in the presence of metal complexes of Pb (II) - 4 - (2-pyridylazo) resorcinol. Stoichiometric ratio for binary complex of Pb and 4 - (2-pyridylazo) resorcinol determined using the job and the maximum ratio for Pb (II): PAR obtained 1:1. Synthesis of Pb (II)-imprinted polymer was carried out with the thermal method, heating for 10 hours at a temperature of 140 ± 10 ° C with HCl 2M as catalyst. Resulting polymer were washed with aqua dm then dried in an oven at a temperature of 50oC. Functional group of synthesized polymers were characterized the by FTIR to determine if the polymer has been successfully prepared. Pb (II)-imprinted polymer grinded to 60-100 mesh size for subsequent use. Pb (II) on Pb (II)-imprinted polymer can be removed with a solution of EDTA 0.05 M. Polymers that have been released ions Pb (II) used to characterize the retention properties by batch method. The maximum adsorption capacity for Pb (II) was 254.86 µg/g at pH 6 with a contact time of 80 minutes. Retention that occurs follow both types of adsorption isotherm, adsorption isotherm of Langmuir and Freundlich . Gibbs free energy for both types of adsorption isotherm of Langmuir and Freundlich is smaller than 20 kJ / mol and negative. Negative value indicates that the adsorption process occure spontaneous and value less than 20 kJ/mol indicates that the adsorption process was chemical adsorption but weak. Ion imprinted polymer was used repeatedly for the adsorption and desorption up to 3 times with the percent of recovery not less than 95%, in regeneration term means that this polymer can be used repeatedly with a good performance. Value relative selectivity factor (?r) for Pb (II) / Cu (II), Pb (II) / Zn (II), and Pb (II) / Cd (II) respectively was 1.16, 1.21, and 1.49. The value of this selectivity factors show that the Pb-imprinted polymer is selective for Pb (II) despite in the presence of other metal ions. Ion imprinted polymer that has been developed also used for preconcentration of Pb (II) in river water samples before analysis by atomic absorption spectrometry method. The obtained preconcentration factor is 16 times and concentrations of Pb (II) in samples of 0.33 ppm with the percent recovery of 97.98%. The obtained value of preconcentration factor and the percent recovery showed that functional materials are well enough to use in the trace analysis of Pb (II). Several parameters in the characterization of retention batch method showed good results, so that the Pb-imprinted polymer can be used as preconcentration column flow injection analysis system (FIA)