Aşılanmış Dokumasız Kumaş Adsorbentlerin Hazırlanması Ve Sulu Çözeltilerden Ağır Metal İyonlarının Uzaklaştırılmasında Kullanımı

Abstract

In this study, the preparation and characterization of 4-amino benzoic (PABA) acid modified glycidyl methacrylate (GMA) grafted PE/PP nonwoven fabrics (NWF) and adsorption studies have been carried out for the removal of environmentally polluting heavy metal ions in aqueous media. The PABA-modified GMA-grafted NWF was prepared in four different steps. First, the plasma treatment was performed to form radical species onto the NWF using the plasma system. GMA monomer was grafted onto NWF by pre-irradiation technique. In the third step, the epoxy ring of GMA was modified with PABA. The PABA modified NWF has been used to adsorption studies of different heavy metal ions. Pre-treatment was performed by changing the applied power and plasma treatment time for the determination of the most favorable plasma conditions. The applied power value and treatment time in the plasma process were adjusted and grafting was carried out at these conditions. Optimum operating conditions for pre-irradiation of NWF structures; The Ar-plasma medium was determined to have a pressure of 0.2 mbar, a power of 70 watts and a plasma processing time of 60 seconds. GMA grafting studies onto NWF were performed at different concentrations, grafting temperature and reaction time. Emulsion monomer solutions were prepared at different concentrations. Graft polymerization was carried out at 40 °C for 4 hours and the degree of grafting was found to be increase with increasing monomer concentration. In GMA grafting studies onto NWF; 4% GMA concentration, 40 ° C grafting temperature and 4 h graft reaction time were selected as optimum grafting conditions. The epoxy ring in the GMA-g-NWF was opened and modified with PABA. The conversion of 81% (2.15 mmol PABA / g adsorbent) was achieved. PABA-NWF was used for the adsorption of Cu(II), Co(II), Cr(III), Cd(II) and Pb(II) metal ions from aqueous solution by studying the effect of pH, adsorption kinetics and the initial concentrations of ions. The optimum pH value was found to be 5.00 for Cu(II), Co(II), Cr(III), Cd(II) and Pb(II) metal ions for adsorption from aqueous solution. The adsorption equilibrium was reached within 3 hours and the amount of adsorption from a 100 ppm Cu(II), Co(II), Cr(III), Cd(II) and Pb(II) metal ion solutions were determined to be 36,44 mg Cu(II)/g, 34,15 mg Co (II)/ g, 29,15 mg Cr (III)/g, 40,56 mg Cd (II)/g and 60,01 mg Pb(II)/g of adsorbent. NWF, GMA-g-NWF, PABA-NWF and metal adsorbed PABA-NWF were characterized by using FT-IR, SEM, EDX, XPS, elemental analysis and TGA.