title: Diethyl phthalate removal from aqueous phase using poly(EGDMA-MATrp) beads: kinetic, isothermal and thermodynamic studies.
abstract: In this study, poly(ethylene glycol dimethacrylate-N-methacryloyl-L-tryptophan methyl ester) [poly(EGDMA-MATrp)] beads (average diameter=106-300 µm), which were synthesized by co-polymerizing of N-methacryloyl-L-tryptophan methyl ester (MATrp) with ethylene glycol dimethacrylate (EGDMA), were used for diethyl phthalate (DEP) adsorption. The various factors affecting the adsorption of DEP from aqueous solutions such as pH, initial concentration, contact time and temperature were analysed. Adsorption behaviour of DEP on the poly(EGDMA-MATrp) beads was investigated by varying pH values of solution, contact time, initial concentration and temperature. An optimum adsorption capacity of 590.7 mg/g for DEP was obtained at 25 °C. The present adsorption process obeyed a pseudo-second-order kinetic model. All the isotherm data can be fitted with the Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Thermodynamic parameters ΔH=7.745 kJ/mol, ΔS=81.92 J/K/mol and ΔG=-16.69 kJ/mol to -18.31 kJ/mol with the rise in temperature from 25 °C to 45 °C indicated that the adsorption process was endothermic and spontaneous.
authors: a Department of Chemistry, Faculty of Science and Art , Uludag University , Bursa , Turkey.
authors: Elif Tümay
authors: ET
authors: Özer
authors: Bilgen
authors: B
authors: Osman
authors: Ali
authors: A
authors: Kara
authors: Emel
authors: E
authors: Demirbel
authors: Necati
authors: N
authors: Beşirli
authors: Şeref
authors: Ş
authors: Güçer
mesh_terms: D007700:Kinetics; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008863:Microspheres; D044367:Phase Transition; D010795:Phthalic Acids / Q000737:chemistry / Q000302:isolation & purification*; D013696:Temperature; D013816:Thermodynamics; D014364:Tryptophan / Q000031:analogs & derivatives* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D008689:Methacrylates; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C018068:N-(2-furyl)acryloyl-L-tryptophan methyl ester; C004919:ethylene dimethacrylate; D014364:Tryptophan; C007379:diethyl phthalate
keywords: adsorption; diethyl phthalate; endocrine-disrupting compounds; polymer; removal