MATEC Web Conf.
Volume 120, 2017International Conference on Advances in Sustainable Construction Materials & Civil Engineering Systems (ASCMCES-17)
|Number of page(s)||9|
|Section||Water and Environment|
|Published online||09 August 2017|
Date seed derived biochar for Ni(II) removal from aqueous solutions
School of Engineering, Griffith University, 170 Kessels Road, Brisbane, Australia
* Corresponding author: firstname.lastname@example.org
The purpose of this study was to investigate the adsorption characteristic of biochars derived from date seed for Ni2+ ions removal from aqueous solutions. Two biochars were prepared by slow pyrolysis of date seed for 3 h at 450 °C (DSB450) and 550 °C (DSB550). The adsorption of Ni2+ was carried out by batch experiments at room temperature. The effects of pyrolysis temperature, contact time, initial metal concentration, and solution pH were investigated. The results showed that biochar prepared at higher temperature (DSB550) had higher adsorption capacity of Ni2+ from aqueous solution than biochar prepared at lower temperature (DBS450). Adsorption efficiency of Ni2+ ions was pH dependent and the maximum adsorption was found to occur at pH around 6.0. To describe the equilibrium isotherms, the experimental results were analyzed by the Langmuir, and Freundlich isotherms. The adsorption isotherm for Ni2+ by DSB550 was best fit to Langmuir isotherm with (R2 = 0.94). The maximum adsorption capacity of Ni2+ of DSB550 biochar was 0.609 mmol g−1. Pseudo-first order, pseudo-second order, and intraparticle diffusion models were used to model the kinetic parameters and mechanism of adsorption process. The results showed that the adsorption kinetics of these biochars are well described by a pseudo-second order kinetic model with correlation coefficient (R2 = 0.99). The results of the study indicated that biochar derived from date seed biomass is a suitable material for adsorption of Ni2+ ion from aqueous solution.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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