Abstract
The biosorption potential of waste biomass young fruit walnuts (YFW) as a low-cost biosorbent, processed from liqueur industry, for Pb(II) ions from aqueous solution was explored. The structural features of the biosorbent were characterized by FTIR spectroscopy, which indicates the possibility that the different functional groups may be responsible for the binding of Pb(II) ions from aqueous solution. The effects of relevant parameters such as pH (2 - 6), contact time (0 - 120 min), biosorbent dosage (2 - 20 g), initial metal ion concentration (10 - 120 mg dm-3), at a temperature of 25(C with stirring (120 rpm) and a constant ionic strength of 0,02 mol dm-3 were evaluated in batch experiments. The sorption equilibrium of Pb(II) ion (when 84 % of metal ions were sorbed at an initial concentration of 15 mg dm-3) was achieved within the pH range 4 - 5 after 50 min. Kinetic data were best described by the pseudo-second order model. Removal efficiency of Pb(II) ion rapidly increased with increasing biosorbent dose from 2.0 to 8.0 g per dm-3 of sorbate. Optimal biosorbent dose was set to 6.0 g per dm3 of sorbate. An increase in the initial metal concentration increases the biosorption capacity. The sorption data of investigated metal ion are fitted to Langmuir, Freundlich and Temkin isotherm models. The equilibrium data were well fitted by the Langmuir isotherm model (R2 ? 0.990). The maximum monolayer biosorption capacity of waste biomass YFW for Pb(II) ion, at 25.0 ? 0.5?C and pH 4.5, was found to be 19.23 mgg-1. This available waste biomass is efficient in the uptake of Pb(II) ions from aqueous solution and could be used as a low-cost and an alternative biosorbent for the treatment of wastewater streams bearing these metal ions.
Highlights
Poslednjih godina, uglavnom su popularni radovi koji se odnose na upotrebu organskog otpada kao biosorbenta za uklanjanje jona teških metala (Pb, Cu, Cd, Cr, Zn i Ni) ili njihovih kompleksa [5,6,7]
The process of obtaining sorbent based on fruit walnuts biomass
Zrna su tretirana azotnom kiselinom (0,001 mol dm–3) radi uklanjanja eventualnih nečistoća, a zatim ispirana redestilovanom vodom do neutralne reakcije na nitrate i sušena na temperaturi od 50±0,5 °C do konstantne mase
Summary
Zbog nedostatka pitke vode u svetu, kvalitet površinskih i podzemnih voda danas je veoma aktuelan problem. Poslednjih godina, uglavnom su popularni radovi koji se odnose na upotrebu organskog otpada (biomase) kao biosorbenta za uklanjanje jona teških metala (Pb, Cu, Cd, Cr, Zn i Ni) ili njihovih kompleksa [5,6,7]. Kao jeftini i efikasni sorbenti, predstavljaju dobro rešenje sa ekološkog aspekta, naročito za uklanjanje jona teških metala iz kontaminiranih voda. Mogućnost primena ljuske oraha ili aktivnog uglja na bazi ljuske oraha kao biosorbenata teških metala (Cu, Cr, Pb, Cd, Cs i Mn) [12,22,26,27,28,29], fosfora [30], organske boje Rodamin B [31], kiselih boja [32] ili ulja [33] iz industrijskih otpadnih voda ili vodenih rastvora je široko opisana u literaturi. Zato je predmet ovog rada ispitivanje mogućnosti primene otpadne biomase mladog ploda oraha (MPO) Juglans regia L. iz procesa proizvodnje likera, kao biosorbenta teških metala iz voda kontaminiranih olovom. The process of obtaining sorbent based on fruit walnuts biomass (maceration 30 days at room temperature, and liquors extraction)
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