SYNTHESIS AND CHARACTERIZATION AMINATED POLY(METHYL METHACRYLATE) ELECTROSPUN FIBER FOR LEAD(II) ION ADSORPTION

• Main Author: BAHRI (NIM : 20514046), AFDAL
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25068
• Institution: Institut Teknologi Bandung

<p align="justify">Environmental pollution caused by heavy metal ions waste is an unresolved problem. Therefore, many techniques have been applied in order to solve this problem, one of them is adsorption technique. It is a commonly used method for treating environmental pollution, due to its cheaper price and easier application compared to others. Various types of adsorbent materials have been developed to increase the adsorption capacity. Electrospun fibers, as one of them. Electrospun fibers are fibers produced by electrospinning technique. They are the potential candidates of adsorbent for heavy metal ions adsorption. Adsorption performance of electrospun fibers are influenced by their polymer properties. Polymers that have high hydrophobicity, like polymethyl methacrylate as the example, has a poor adsorption performance. Adsorption performance can be improved through the addition of other materials (blending) or by functionalization. Polymethyl methacrylate (PMMA) electrospun fibers have been used as an adsorbent by blending it with chitosan. However, based on literature, there had not been any research yet showing the use of PMMA electrospun fibers by functionalization as adsorbent of heavy metal ions, lead (II)'s metal ions to be exact. In this study, PMMA electrospun fibers has been chemically modified using ethylenediamine, designed for lead (II) adsorption. The PMMA electrospun fibers were synthesized by electrospinning technique at ambient conditions, at 26º C temperature and relative humidity of 80 ± 10%. Selection of the concentration is an important factor in producing electrospun fibers. Production of electrospun fibers can not be achieved at the concentration below 11%, in the voltage range of 10 &#8722; 20 kV, flow rate of 0,001 to 0,0167 mL / min, and distance between the spinneret of the collector is from 10 to 15 cm. Electrospun fibers were succesfully produced at 12,2% and 13,7% w/w PMMA in DMF. Electrospinning conditions for both concentrations were performed on the voltages 13 and 19 kV, and the flow rate of the polymer solution of 0,001 and 0,0167 mL / min, with distance of the spinneret to collector of 15 cm. Based on the SEM image, PMMA electrospun fibers do not contain beads. Diameter of the PMMA of electrospun fibers is within the range of 940 nm to 1840 nm. Based on BET isotherm data, surface area of PMMA electrospun fiber is 21,167 m2/g. Modification of PMMA electrospun fibers with ethelenediamine led to the emergence of an amide peak at 1654 cm-1 and N-H secondary peak at 1545 cm-1. Those peaks indicated the success of the aminolysis reaction. Adsorption performance was done in batch method. The maximum adsorption are obtained in the contact time of 90 minutes, pH 5, and the initial concentration of 300 ppm. The maximum adsorption capacity of aminated PMMA electrospun fibers is 25,67 mg/g. This study has been tested by three models of adsorption isotherm named Langmuir, Freundlich and Dubinin-Raduskevich. While the kinetic models, were tested by pseudo orde satu, pseudo orde dua, and internal diffusion model. In this study Dubinin-Raduskevich and intraparticle diffusion model model were used to predict the process of adsorption. Based on the adsorption data, adsorption of lead (II) by aminated PMMA electrospun fibers tend to follow the Langmuir isotherm model and pseudo orde dua kinetic model.<p align="justify">