THE SYNTHESIS OF POLYVINYLIDENE FLUORIDE (PVDF) MEMBRANE DISPERSED BY MOLECULARLY IMPRINTED POLYMERS (MIPs) FOR THE REMOVAL OF 2,4-DINITROPHENOL (2,4-DNP) FROM AQUEOUS SOLUTION

• Main Author: AYULIANSARI (NIM:20516036), YOSSY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31784
• Institution: Institut Teknologi Bandung

2,4-Dinitrophenol has been used in many applications such as dyes, wood <br /> <br /> preservatives, and pesticides, but is toxic and non-biodegradable. 2.4-dinitrophenol <br /> <br /> waste can be dissolved and accumulated in water. When it is in high concentrations <br /> <br /> it will be harmful to human health and the environment. Therefore, proper handling <br /> <br /> of 2,4-dinitrophenol wastes is required. In this research, Molecularly Imprinted <br /> <br /> Polymers (MIPs) was dispersed by polyvinylidene fluoride (PVDF) membrane for <br /> <br /> the absorption of 2,4-dinitrophenol. MIPs was synthesized using a bulk <br /> <br /> polymerization technique involving 2,4-dinitrophenol as a template, acrylamide as <br /> <br /> functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinker and <br /> <br /> benzoyl peroxide (BPO) as an initiator in the mol ratio of 1: 5: 15: 1.6 dissolved in <br /> <br /> 30 mL acetonitrile. The 2,4-Dinitrophenol bound to the synthesis of MIPs was <br /> <br /> subsequently released by the soxhletation method using a 75% methanol as solvent <br /> <br /> in glacial acetic acid. Furthermore, MIPs performance compared with Non <br /> <br /> Imprinted Polymers (NIP) and characterized using Scanning Electron Microscopy <br /> <br /> (SEM) and Fourier Transform Infra Red (FTIR) spectroscopy. The MIPs dispersed <br /> <br /> into the PVDF membrane by a phase inversion method prepared by adding 50 mg <br /> <br /> of MIPs powder to 20% PVDF (w/v) solution in N,N-dimethylformamide (DMF) <br /> <br /> as the solvent and distilled water as non-solvent. The obtained membranes were <br /> <br /> characterized by FTIR spectroscopy, and the permeability values were determined. <br /> <br /> The results showed that the value of adsorption capacity (qe) and the average <br /> <br /> absorption percentage of MIPs is greater than NIP. In MIPs obtained qe and percent <br /> <br /> absorption of 9.32 mg/g and 56.75% while NIP have qe and absorption percentage <br /> <br /> equal to 4.22 mg/g and 25.74%. Based on the FTIR spectrum analysis, the presence <br /> <br /> of a sharp peak at the wave number 1570-1500 cm-1 corresponding to -NO2 group <br /> <br /> in the 2,4-dinitrophenol bound to the MIPs template did not appear on the NIP <br /> <br /> spectrum. Based on the SEM image, the MIPs dispersed PVDF membrane has a <br /> <br /> thickness that is thinner than the PVDF membrane so that the separation process on <br /> <br /> the dispersed membrane occured more rapidly. The membrane separation process <br /> <br /> of the 2,4-dinitrophenol sample was tested based on the determination of the <br /> <br /> rejection coefficient at pH 3, 4, 5 and 6. The results showed that both membranes <br /> <br /> had an optimum rejection percentage value at pH 5 of 81.85% with a permeability <br /> <br /> value of 9.14454 Lm-2h-1bar-1 on the MIPs dispersed membrane and 76.98% with a <br /> <br /> permeability value of 3.93208 Lm-2h-1bar-1 on original PVDF membrane. <br />