Glycidyl methacrylate macroporous copolymer grafted with diethylene triamine as sorbent for Reactive Black 5/Makroporozni kopolimer na bazi glicidilmetakrilata funkcionalizovan sa dietilentriaminom kao sorbent tekstilne boje Reactive Black 5

• Published in: Hemijska industrija Vol. 68; no. 6; p. 685
• Main Authors: Sandic, Zvjezdana P, Zunic, Marija J, Maksin, Danijela D, Milutinovic- Nikolic, Aleksandra D, Popovic, Aleksandar R, Jovanovic, Dusan M, Nastasovic, Aleksandra B
• Format: Journal Article
• Language: English
• Published: Association of Chemical Engineers of Serbia 01.11.2014
• Subjects: Amines; Chemical properties; Identification and classification; Reactive dyes; Sorbents
• ISSN: 0367-598X
• DOI: 10.2298/HEMIND140127023S

In this paper, macroporous glycidyl methacrylate and ethylene glycol dimethacrylate copolymer functionalized with diethylene triamine (PGME-deta), was evaluated as Reactive Black 5 (RB5) sorbent. Batch RB5 removal from aqueous solution by PGME-deta was investigated by varying pH, contact time, sorbent dosage, initial dye concentration and temperature. The sorption is pH sensitive having maximum at pH 2 (dye removal of 85%), decreasing with the increase of pH (dye removal of 24% at pH 11) after 60 min. Sorption kinetics was fitted to chemical-reaction and particle-diffusion models (pseudo- first-, pseudo-second-order, intraparticle diffusion and Mckay models). The pseudo- second-order kinetic model accurately predicted the RB5 amount sorbed under all investigated operating conditions, while the intraparticle diffusion was the dominant rate-limiting mechanism. The diffusion mechanism was more prevalent with the decrease in temperature and the increase in concentration. The isotherm data was best fitted with the Langmuir model, indicating homogeneous distribution of active sites on PGME-deta and monolayer sorption, with the maximum sorption capacity of 353 mg [g.sup.-1]. The calculated sorption rates improved with increasing temperature and an activation energy close to 40 kJ [mol.sup.-1] was determined, suggesting that chemisorption was also rate-controlling. Keywords: Reactive Black 5, macroporous crosslinked copolymer, diethylene triamine, kinetic modeling, equilibrium study. U okviru ovog rada ispitana je mogucnost koriscenja makroporoznog kopolimera glicidilmetakrilata i etilenglikoldimetakrilata funkcionalizovanog reakcijom otvaranja epoksidnih grupa sa dietilentriaminom (PGME-deta) kao sorbenta reaktivne tekstilne boje Reactive Black 5 (RB5). U sarznim uslovima je ispitano uklanjanje RB5 iz vodenog rastvora pomocu PGME-deta, variranjem pH, vremena kontakta, mase sorbenta, pocetne koncentracije boje i temperature. PGME-deta je pokazao afinitet za sorpciju RB5 zbog prisustva protonovanih amino grupa koje privlace anjonske sulfonatne grupe u molekulu boje i mogucnosti stvaranja vodonicnih veza izmedu sorbenta i sorbata. Kinetika sorpcije je analizirana pomocu cetiri kineticka modela (pseudo-prvog, pseudo-drugog reda, unutarcesticne difuzije i Mekej) da bi se odredilo koji model najbolje opisuje sorpciju RB5. Zapazen je izrazit uticaj pH vrednosti na sorpciju RB5, sa maksimumom na pH 2 (pr cemu je efikasnost uklanjanja boje 85%), i smanjenjem kolicine sorbovane boje sa povecanjem pH (kolicina uklonjene boje na pH 11 posle 60 min iznosi samo 24%). Izucavanjem kinetike sorpcije pokazalo se da sorpcija RB5 pomocu PGME-deta sledi kineticki model pseudo-drugog reda (PSO), sugerisuci da je brzina sorpcije kontrolisana kapacitetom sorbenta i koncentracijom sorbata. Mehanizam procesa dominantno cini unutarcesticna difuzija, uz manji uticaj difuzije kroz film. Ovi mehanizmi difuzije su izrazeniji pri nizim temperaturama i vecim koncentracijama. Langmirov model najbolje opisuje ravnoteznu izotermu, ukazujuci na homogenu raspodelu aktivnih mesta na povrsini PGME-deta i monoslojnu sorpciju. Maksimalni sorpcioni kapacitet izracunat iz Langmirove izoterme iznosi 353 mg [g.sup.-1]. Zapazeno je da se brzina sorpcije povecava sa povecanjem temperature. Izracunata vrednost aktivacione energije od oko 40 kJ [mol.sup.-1] potvrduje da se radi o procesu koji dominantno kontrolise hemisorpcija. Kljucne reci: Reactive Black 5 * Makroporozni Umrezeni kopolimer * Dietilentriamin * Kineticki modeli * Ravnotezna sorpcija Available online at the Journal website: