Removal of Lead From Aqueous Solution Using Superparamagnetic Palygorskite Nanocomposite: Material Characterization and Regeneration Studies
作者： Ruhaida Rusmin , Binoy Sarkar , Takuya Tsuzuki , Nobuyuki Kawashima , Ravi Naidu
DOI: 10.1016/J.CHEMOSPHERE.2017.08.036
关键词:
摘要: A palygorskite-iron oxide nanocomposite (Pal-IO) was synthesized in situ by embedding magnetite into the palygorskite structure through co-precipitation method. The physico-chemical characteristics of Pal-IO and their pristine components were examined various spectroscopic micro-analytical techniques. Batch adsorption experiments conducted to evaluate performance removing Pb(II) from aqueous solution. surface morphology, magnetic recyclability efficiency regenerated using desorbing agents HCl (Pal-IO-HCl) ethylenediaminetetraacetic acid disodium salt (EDTA-Na2) (Pal-IO-EDTA) compared. showed a superparamagnetic property (magnetic susceptibility: 20.2 emu g−1) with higher specific area (99.8 m2 than (49.4 iron (72.6 g−1). maximum capacity 26.6 mg g−1 (experimental condition: 5 g L−1 adsorbent loading, 150 agitations min−1, initial concentration 20 500 L−1, at 25 °C) easy separation spent adsorbent. data best fitted Langmuir isotherm model (R2 = 0.9995) pseudo-second order kinetic 0.9945). desorption EDTA as complexing agent produced no disaggregation crystal bundles, able preserve composite's recyclability. Pal-IO-EDTA exhibited almost 64% removal after three cycles regeneration preserved nanocomposite's structural integrity properties (15.6 holds advantages sustainable material (easily separable recyclable) for potential application purifying heavy metal contaminated wastewaters.
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