Sustainable natural adsorbents for heavy metal removal from wastewater: lead sorption on pine bark (Pinus radiata D.Don) |
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| Authors: | Gonzalo Montes‐Atenas Sven L M Schroeder |
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| Affiliation: | 1. Minerals and Metals Characterisation and Separation (M2CS) Research Group, Mining Engineering Department, Faculty of Physical and Mathematical Sciences, The University of Chile, Santiago, Chile;2. School of Chemistry, The University of Manchester, Manchester, United Kingdom;3. School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom;4. Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Oxfordshire, United Kingdom |
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| Abstract: | Aqueous Pb(II) adsorption on pine bark (Pinus Radiata D.Don), an inexpensive and sustainable natural sorbent material, has been evaluated and the mechanism of metal retention characterized by scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X‐ray photoelectron spectroscopy (XPS). Bark pulp densities >1.5 g l?1 achieve near 100% Pb(II) removal from aqueous solutions containing 100 mg l?1 Pb(II). Adsorption rates increased with pulp density, although adsorption capacity diminished at high densities because of blockage of adsorption sites. The effects of washing and sulfuric acid activation were assessed and found to be less important than in previous metal sorption studies. Pb(II) sorption takes place mainly at the lignocellulosic C―O groups, with adsorption at phenolic sites appearing to be most significant. © 2016 The Authors. Surface and Interface Analysis published by John Wiley & Sons, Ltd. |
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| Keywords: | wastewater adsorption heavy metals lead pine bark biosorbents |
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