Abstract
In this paper the possibility of implementing the new biosorbent composed of chemically modified short hemp fibers impregnated with alginate gel for adsorption of lead(II) and zinc (II) ions was investigated. Waste hemp fibers, alkaly treated, were used as an alginate carrier in order to improve the mechanical stability of alginate. Morphological characteristics of obtained alginate-hemp composite were investigated by scanning electron microscopy (SEM), while the Fourier transform infrared spectroscopy (FT-IR) was used for examination of surface chemistry. Alginate immobilization on the hemp fibers surface leads to the morphological changes, by decreasing the roughness of short hemp fibers. FT-IR analysis showed that surface chemistry was changed after alginate immobilization, primarily by increasing the amount of carboxyl groups. The presence of surface groups characteristic for hemp fibers, on the surface of biocomposite, indicate that the surface of hemp fibers is not completely covered by alginate. Adsorption characteristics of alginate-hemp biosorbent were examined through the adsorption of lead and zinc ions, and compared with the adsorption characteristics of alkali treated hemp fibers. Biosorption of lead and zinc ions onto both hemp fibers and alginate-hemp composite, represent fast process since 80 % of initial ions amount were adsorbed in first five minutes. Obtained adsorption data were analyzed by Lagergren pseudo-first and pseudo-second order kinetic models, as well as intraparticle diffusion model. It was found that biosorption of lead and zinc ions on alkali treated hemp fibers and alginate-hemp composite obey the pseudo-second order adsorption kinetics, indicating that adsorption/binding of ions is mediated by chemical forces rather than physical forces of attraction. This observation was confirmed by results of FT-IR analysis of alginate composite surface before and after ions adsorption. It was found that lead and zinc ions predominantly bind on carboxyl and hydroxyl groups through the ion-exchange and surface complexation. New biosorbent demonstrated effective removal of the ions, with the possibility of further process optimization in order to increase the adsorption capacity and rate of metal ions removal.
Highlights
Na osnovu dobijenih pravolinijskih zavisnosti prikazanih na slici 5a i 5b može se zaključiti da se kinetika procesa adsorpcije olova i cinka na uzorcima modifikovanih vlakana konoplje, kao i na kompozitu alginat-konoplja, može opisati modelom pseudo-drugog reda
[28] J.Nastaj, A.Przewłocka, M.Rajkowska-Myśliwiec (2016) Biosorption of Ni(II), Pb(II) and Zn(II) on calcium alginate beads: equilibrium, kinetic and mechanism studies, Polish Journal of Chemical Technology, 18, 81-87
Summary
Kao nosač alginata u ovom radu korišćena su kratka, zamršena, otpadna vlakna konoplje dobijena od kompanije ITES iz Odžaka. U cilju poboljšanja sorpcionih svojstava, vlakna konoplje su hemijski modifikovana korišćenjem 17.5% rastvora NaOH. Modifikovanje vlakana izvršeno je na sobnoj temperaturi tokom 5 minuta, potapanjem 1 g vlakana konoplje u 50 cm rastvora NaOH. Modifikovana vlakna (K) su neutralisana 1% rastvorom sirćetne kiseline, isprana destilovanom vodom i osušena [13]. Kompozit alginat-konoplja dobijen je potapanjem vlakana konoplje u 1% rastvoru natrijumalginata. Impregnisana vlakna su sušena 24 h na sobnoj temperaturi, pa je postupak potapanja i sušenja ponovljen. U cilju formiranja kalcijum alginatnog gela na površini vlakana impregnisanih Na-alginatom, ona su tretirana 2% (w/v) rastvorom CaCl2 tokom 24 h, a potom sušena 24 h na temperaturi od 60 oC. Dobijeni kompozit alginat-konoplja (AK) je zadržao vlaknastu formu konoplje, a u slkadu sa potrebama daljih eksperimenata, vlakna su sečena na odgovarajuću dužinu
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
