BIOSORPTION OF Zn(II) IONS FROM AQUEOUS SOLUTION ONTO MUSTARD WASTE BIOMASS
Journal Title: BULETINUL INSTITUTULUI POLITEHNIC DIN IASI, CHIMIE SI INGINERIE CHIMICA - Year 2016, Vol 62, Issue 3
Abstract
In this study, the mustard waste biomass, obtained from mustard seeds after oil extraction, was used as biosorbent for removal of Zn(II) ions from aqueous solution. The experiments were performed in batch systems at room temperature, and have follow the influence of initial solution pH, biosorbent dose, initial Zn(II) concentration and contact time, in order to establish the optimal experimental conditions. About 0.125 g of mustard waste biomass was enough to remove 80% of 40.67 mg·L-1 Zn(II) ions from 25 mL of aqueous solution in 60 min, at initial solution pH of 5.5, considered to be optimal. The Langmuir and Freundlich isotherm models were used for the mathematical modelling of the equilibrium isotherm, obtained experimentally. The experimental data well fit with Langmuir model, and the characteristic parameters of this model agree with the conditions of favourable biosorption. The pseudo-first order and pseudo-second order kinetic models were used for kinetic modelling of the experimental data. The values of kinetics parameters calculated for both models have shown that the pseudo-second order equation is more adequate. The experimental results indicate that mustard waste biomass has a good biosorption capacity for Zn(II) ions, and can be considered a potential biosorbent for the treatment of industrial wastewaters.
Authors and Affiliations
LĂCRĂMIOARA NEGRILĂ, DUMITRU BULGARIU, LAURA BULGARIU
Keywords
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