Sustainable natural adsorbents for heavy metal removal from wastewater: lead sorption on pine bark (Pinus radiata D.Don)

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摘要：

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 >1.5gl1 achieve near 100% Pb(II) removal from aqueous solutions containing 100mgl1 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. Copyright 2015 John Wiley & Sons, Ltd.

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关键词：

wastewater adsorption heavy metals lead pine bark biosorbents

DOI：

10.1002/sia.5807

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年份：

2015